JP2019016660A - Secondary cell and manufacturing method therefor - Google Patents

Abstract

To provide a technology for making a secondary cell in a desired size.SOLUTION: A secondary cell 10 includes: a base material 11; an n-type metal oxide material; and an insulation material, and further includes: a charge layer 14 formed on a first surface 11a of the base material 11; a second electrode 17 formed on the charge layer 14; a protective material layer 19 formed on the second electrode 17; and an adhesive layer 18 formed on a second surface 11b of the base material 11.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a technique for making a secondary battery have a desired size.

  Patent Document 1 discloses a sheet battery testing apparatus. In the test apparatus of Patent Document 1, a sheet roll wound in a roll shape is used as a sheet-like secondary battery. The test apparatus includes a sheet supply unit that supplies a sheet from a sheet roll, a sheet folding mechanism unit that folds the sheet supplied from the sheet supply unit, and a sheet cutting unit that cuts the sheet.

JP, 2006-520254, A

  When cutting a sheet-shaped secondary battery from a sheet roll, the planar shape (simply referred to as a shape) of the sheet-shaped secondary battery is a rectangular sheet shape. By the way, there are a wide variety of applications that use sheet-like secondary batteries. In particular, a sheet-like secondary battery may be used for a wearable device or the like that needs to be downsized, a device that needs to be thin, such as a POP advertisement (Point Of Purchase advertising), a guide plate, or the like.

  There is a demand on the user side of the battery to make the sheet-like secondary battery have a desired battery capacity and shape. For example, if the user can cut the sheet-like secondary battery from the sheet roll with a size corresponding to the size of the application, the battery capacity and shape can be optimized for each size of the application.

  This invention is made | formed in view of said subject, and aims at providing to the technique for making a sheet-like secondary battery into a desired magnitude | size.

  A secondary battery according to one aspect of the present embodiment includes a base material, an n-type metal oxide material and an insulating material, a charging layer formed on the first surface of the base material, and the charging layer An electrode formed thereon, a protective material layer formed on the electrode, and an adhesive layer formed on the second surface of the substrate.

  In the above secondary battery, a laminate composed of the base material, the charging layer, the electrode, the protective material layer, and the pressure-sensitive adhesive layer is wound in a roll shape so that the protective material layer is on the outside. It may be turned.

  Said secondary battery WHEREIN: It is preferable that the said protective material layer is a peeling sheet provided so that peeling from the said electrode was possible.

  Said secondary battery WHEREIN: It is preferable that the dividing line which divides | segments the said electrode and the said charge layer is provided.

  In the above secondary battery, the electrode on the charging layer is a positive electrode, the base material is a negative electrode, a p-type oxide semiconductor layer is formed between the positive electrode and the charging layer, and the negative electrode It is preferable that an n-type oxide semiconductor layer is formed between the charge layer and the charge layer, the p-type oxide semiconductor layer, and the electrode are divided by the dividing line.

  In the method for manufacturing a secondary battery according to one aspect of the present embodiment, a charging layer including an n-type metal oxide material and an insulating material and an electrode are sequentially stacked on the first surface of the substrate. A laminate manufacturing process for manufacturing a laminate, an adhesive layer forming process for forming an adhesive layer on the second surface of the substrate, and a protective material layer for forming a protective material layer on the electrode And a dividing line forming step for forming a dividing line for dividing the electrode and the charging layer.

  The manufacturing method may further include a cutting step of cutting the secondary battery along the width direction of the base material at a cutting position between the two adjacent dividing lines.

  In the above manufacturing method, it is preferable that the dividing line is formed by laser irradiation in the dividing line forming step.

  In the above manufacturing method, the dividing line forming step may be performed before the protective material layer forming step.

  In the above manufacturing method, the dividing line forming step may be performed after the protective material layer forming step.

  Said manufacturing method WHEREIN: The said protective material layer may be formed with a peeling sheet, and may further have the peeling process which peels the said protective material layer from the said electrode after the said cutting process.

  In the manufacturing method, in the stacked body, the electrode on the charging layer is a positive electrode, the base material is a negative electrode, and a p-type oxide semiconductor layer is formed between the positive electrode and the charging layer. An n-type oxide semiconductor layer may be formed between the negative electrode and the charging layer.

  ADVANTAGE OF THE INVENTION According to this invention, the technique for making a secondary battery into a desired magnitude | size can be provided.

It is a perspective view which shows the structure of a secondary battery typically. It is sectional drawing which shows the structure of a secondary battery typically. It is a figure for demonstrating the cutting position of a secondary battery. It is a flowchart which shows the manufacturing method of a secondary battery. It is a figure which shows typically the structure of the secondary battery after dividing line formation. It is sectional drawing which shows the structure which connected the terminal to the secondary battery. 4 is a flowchart showing a method for manufacturing a secondary battery according to a second embodiment; It is a figure which shows the structure of the secondary battery before dividing line formation. It is a figure which shows the structure of the secondary battery after dividing line formation. 6 is a diagram for explaining a cutting position of a secondary battery according to a second embodiment; FIG.

  Hereinafter, an example of an embodiment of the present invention will be described with reference to the drawings. The following description shows preferred embodiments of the present invention, and the technical scope of the present invention is not limited to the following embodiments.

Embodiment 1 FIG.
The secondary battery 10 will be described with reference to FIGS. 1 and 2. FIG. 1 is a perspective view schematically showing the overall configuration of the secondary battery 10. FIG. 2 is a cross-sectional view showing a basic cross-sectional configuration of the secondary battery 10.

  As shown in FIG. 1, the secondary battery 10 is wound in a roll shape. Specifically, the roll-shaped secondary battery 10 is formed by winding a sheet on which a laminated body to be a battery is formed around the reel 51. The cutter 52 can cut the secondary battery 10 into a predetermined size. For example, the cutter 52 is a metal blade provided along the roll width direction. The cutter 52 cuts the tip end portion (A portion in FIG. 1) of the secondary battery 10 sent out from the reel 51. Thereby, the sheet-like secondary battery 10 is cut out.

  FIG. 2 shows a cross section of the secondary battery 10 after being cut, that is, the sheet-like secondary battery 10. FIG. 2 is a cross-sectional view along the roll width direction of the cut out secondary battery 10 (part A in FIG. 1). As shown in FIG. 2, the secondary battery 10 includes a laminate 20, an adhesive layer 18, and a protective material layer 19.

  Among the constituent elements of the secondary battery 10, the stacked body 20 has a function as a battery. The stacked body 20 has a stacked structure in which the n-type oxide semiconductor layer 13, the charging layer 14, the p-type oxide semiconductor layer 16, and the second electrode 17 are stacked in this order on the substrate 11. . Here, let the surface (upper surface in FIG. 2) in which the n-type oxide semiconductor layer 13 of the base material 11 is formed be the 1st surface 11a. On the other hand, let the surface (lower surface in FIG. 2) in which the adhesive layer 18 of the base material 11 is provided be the 2nd surface 11b.

  An adhesive layer 18 is formed on the second surface 11b of the base material 11 so as to cover the entire second surface 11b. The pressure-sensitive adhesive layer 18 is formed of a pressure-sensitive adhesive, and the pressure-sensitive adhesive layer 18 is formed of a material such as rubber or resin. As the adhesive layer 18, a paste-like or gel-like adhesive may be applied to the second surface 11 b of the substrate 11. Or you may affix the adhesive film or adhesive sheet which has adhesiveness on both surfaces to the 2nd surface 11b of the base material 11. FIG. The pressure-sensitive adhesive layer 18 is formed so as to be in contact with the second surface 11 b of the substrate 11.

  A protective material layer 19 is formed on the second electrode 17 so as to cover the entire second electrode 17. The protective material layer 19 is formed in contact with the second electrode 17 and protects the second electrode 17. The protective material layer 19 is a peelable release sheet. The second electrode 17 is exposed by peeling off the protective material layer 19.

  Thus, the secondary battery 10 after being cut as shown in FIG. 2 has a laminated structure in which the laminated body 20 having a function as a battery is disposed between the protective material layer 19 and the adhesive layer 18. doing. In other words, even before the cutting, in a state where the secondary battery 10 is fed out into a sheet shape, the protective material layer 19 is formed on one surface (the upper surface in FIG. 2) of the secondary battery 10. The pressure-sensitive adhesive layer 18 is exposed on the other surface (the lower surface in FIG. 2). On the other hand, as shown in FIG. 1, when the secondary battery 10 is wound in a roll shape, the protective material layer 19 is on the outside, and the pressure-sensitive adhesive layer 18 is bonded to the protective material layer 19. Therefore, the roll-shaped secondary battery 10 is in a state like a roll-shaped adhesive tape (cellophane tape (registered trademark)). Thereby, handling becomes easy.

  Hereinafter, a detailed configuration of the stacked body 20 that functions as a rechargeable battery will be described. The substrate 11 is formed of a conductive material such as a metal and functions as a first electrode. In this embodiment, the base material 11 is a negative electrode. As the substrate 11, for example, a metal foil sheet such as a SUS sheet or an aluminum sheet can be used.

  It is also possible to prepare the base material 11 made of an insulating material and form the first electrode on the base material 11. That is, the base material 11 should just be a structure containing a 1st electrode. When forming a 1st electrode on the base material 11, metal materials, such as chromium (Cr) or titanium (Ti), can be used as a material of a 1st electrode. As a material for the first electrode, an alloy film containing aluminum (Al), silver (Ag), or the like may be used. When the first electrode is formed on the substrate 11, it can be formed in the same manner as the second electrode 17 described later. When the base material 11 is an insulating material, for example, a resin sheet is used as the base material 11. That is, the substrate 11 can be a sheet made of metal or resin.

An n-type oxide semiconductor layer 13 is formed on the base material 11. The n-type oxide semiconductor layer 13 includes an n-type oxide semiconductor material (second n-type oxide semiconductor material). As the n-type oxide semiconductor layer 13, for example, titanium dioxide (TiO ₂ ), tin oxide (SnO ₂ ), zinc oxide (ZnO), or the like can be used. For example, the n-type oxide semiconductor layer 13 can be formed on the substrate 11 by sputtering or vapor deposition. As a material for the n-type oxide semiconductor layer 13, titanium dioxide (TiO ₂ ) is preferably used.

  A charge layer 14 is formed on the n-type oxide semiconductor layer 13. The charging layer 14 is formed of a mixture in which an insulating material and an n-type oxide semiconductor material are mixed. For example, a fine-particle n-type oxide semiconductor can be used as the n-type oxide semiconductor material (first n-type oxide semiconductor material) of the charging layer 14. An n-type oxide semiconductor changes its photoexcitation structure by irradiation with ultraviolet rays, and becomes a layer having a charging function. Silicone resin can be used as the insulating material of the charging layer 14. For example, as the insulating material, it is preferable to use a silicon compound (silicone) having a main skeleton with a siloxane bond such as silicon oxide.

For example, the charge layer 14 is formed of silicon oxide and titanium dioxide using the first n-type oxide semiconductor material as titanium dioxide. In addition, as the n-type oxide semiconductor material that can be used in the charge layer 14, tin oxide (SnO ₂ ) or zinc oxide (ZnO) is suitable. It is also possible to use materials that combine two or all of titanium dioxide, tin oxide, and zinc oxide.

  The manufacturing process of the charge layer 14 will be described. First, a coating liquid in which a solvent is mixed with a mixture of a precursor of titanium oxide, tin oxide, or zinc oxide and silicone oil is prepared. A coating solution in which fatty acid titanium and silicone oil are mixed in a solvent is prepared. Then, the coating solution is applied onto the n-type oxide semiconductor layer 13 by a spin coating method, a slit coating method, or the like. The charge layer 14 can be formed on the n-type oxide semiconductor layer 13 by drying and baking the coating film. As an example of the precursor, for example, titanium stearate which is a precursor of titanium oxide can be used. Titanium oxide, tin oxide, and zinc oxide are formed by decomposition from an aliphatic acid salt that is a precursor of a metal oxide. The charging layer 14 after drying and firing may be UV-cured by irradiating with ultraviolet rays.

  For titanium oxide, tin oxide, zinc oxide, and the like, fine particles of an oxide semiconductor can be used without using a precursor. A liquid mixture is produced by mixing nanoparticles of titanium oxide or zinc oxide with silicone oil. Furthermore, a coating liquid is produced | generated by mixing a solvent with a liquid mixture. A coating solution is applied onto the n-type oxide semiconductor layer 13 by a spin coating method, a slit coating method, or the like. The charging layer 14 can be formed by performing drying, baking, and UV irradiation on the coating film.

  The first n-type oxide semiconductor material included in the charging layer 14 and the second n-type oxide semiconductor material included in the n-type oxide semiconductor layer 13 may be the same or different. Good. For example, when the n-type oxide semiconductor material included in the n-type oxide semiconductor layer 13 is tin oxide, the n-type oxide semiconductor material of the charge layer 14 may be tin oxide, or n other than tin oxide. It may be a type oxide semiconductor material.

A p-type oxide semiconductor layer 16 is formed on the charging layer 14. The p-type oxide semiconductor layer 16 includes a p-type oxide semiconductor material. As a material of the p-type oxide semiconductor layer 16, nickel oxide (NiO), copper aluminum oxide (CuAlO ₂ ), or the like can be used. For example, the p-type oxide semiconductor layer 16 is a nickel oxide film having a thickness of 400 nm. The p-type oxide semiconductor layer 16 is formed on the charging layer 14 by a film formation method such as vapor deposition or sputtering.

  The second electrode 17 only needs to be formed of a conductive film. Moreover, as a material of the 2nd electrode 17, metal materials, such as chromium (Cr) or copper (Cu), can be used. As another metal material, there is a silver (Ag) alloy containing aluminum (Al). Examples of the forming method include vapor phase film forming methods such as sputtering, ion plating, electron beam evaporation, vacuum evaporation, and chemical vapor deposition. The metal electrode can be formed by an electrolytic plating method, an electroless plating method, or the like. In general, copper, copper alloy, nickel, aluminum, silver, gold, zinc, tin or the like can be used as a metal used for plating. For example, the second electrode 17 is an Al film having a thickness of 300 nm.

  As described above, the stacked body 20 includes the base material 11, the n-type oxide semiconductor layer 13, the charging layer 14, the p-type oxide semiconductor layer 16, and the second electrode 17. Therefore, the second electrode 17 is disposed on the outermost surface of the sheet-like secondary battery 10. The base material (first electrode) 11 and the n-type oxide semiconductor layer 13 constitute the negative electrode layer 21. The p-type oxide semiconductor layer 16 and the second electrode 17 constitute a positive electrode layer 22.

  In the above description, the n-type oxide semiconductor layer 13 is disposed below the charging layer 14 and the p-type oxide semiconductor layer 16 is disposed above the charging layer 14. The layer 13 and the p-type oxide semiconductor layer 16 may be arranged opposite to each other. In other words, the n-type oxide semiconductor layer 13 may be disposed on the charging layer 14 and the p-type oxide semiconductor layer 16 may be disposed below. In this case, the base material 11 is a positive electrode and the second electrode 17 is a negative electrode. In other words, if the charging layer 14 is sandwiched between the n-type oxide semiconductor layer 13 and the p-type oxide semiconductor layer 16, the n-type oxide semiconductor layer 13 may be disposed on the charging layer 14. The p-type oxide semiconductor layer 16 may be disposed. In other words, the sheet-like secondary battery 10 includes a first electrode (base material 11), a first conductive oxide semiconductor layer (n-type oxide semiconductor layer 13 or p-type oxide semiconductor layer 16), a charging layer. 14, the second conductive semiconductor layer (p-type oxide semiconductor layer 16 or n-type oxide semiconductor layer 13) and the second electrode 17 may be stacked in this order.

  Further, the sheet-like secondary battery 10 includes a first electrode (base material 11), a first conductive oxide semiconductor layer (n-type oxide semiconductor layer 13 or p-type oxide semiconductor layer 16), a charging layer 14, A configuration including a layer other than the second conductive semiconductor layer (p-type oxide semiconductor layer 16 or n-type oxide semiconductor layer 13) and the second electrode 17 may be employed.

  The base material 11 and the n-type oxide semiconductor layer 13 are referred to as a negative electrode layer 21. The p-type oxide semiconductor layer 16 and the second electrode 17 are referred to as a positive electrode layer 22. In the laminate 20 shown in FIG. 1, some layers may be omitted, or other layers may be added. Specifically, any configuration including at least a positive electrode, a negative electrode, and a charging layer may be used. Therefore, the negative electrode layer 21 may be only the base material 11 and may have other layers. Further, the positive electrode layer 22 may be only the second electrode 17 or may have other layers.

  A sheet-like battery 10 having the laminated structure shown in FIG. 2 in which the laminate 20 having the above-described configuration is disposed between the pressure-sensitive adhesive layer 18 and the protective material layer 19 is rolled on a reel 51 as shown in FIG. It is wound around. In this state, the battery 10 has a shape like a roll-shaped adhesive tape. The sheet-shaped secondary battery 10 is manufactured by the cutter 52 cutting out the tip portion sent out from the roll-shaped secondary battery 10 with a predetermined size. That is, the cutter 52 can cut the secondary battery 10 with a size corresponding to the size of the application. Therefore, the degree of freedom in application design can be improved.

  For example, the battery manufacturer of the secondary battery 10 sells the roll-shaped secondary battery 10 as a product. Then, a user of the secondary battery 10 (for example, a device manufacturer of an electronic device in which the secondary battery 10 is mounted) cuts out the secondary battery 10 in a size corresponding to the battery capacity required for the electronic device and the installation space. Can do. That is, according to the present invention, the user can make the secondary battery 10 have a desired battery capacity and size without being restricted by a predetermined standard size. Thereby, the freedom degree at the time of a user examining and designing an electronic device can be made high.

  The user can cut out the secondary battery 10 in a shape corresponding to the size and shape of the electronic device to be used. For example, in an electronic device incorporating the secondary battery 10, the sheet-like secondary battery 10 can be cut out according to the shape of the case of the electronic device. Since the sheet-like secondary battery 10 can be cut into an arbitrary shape, the design of the electronic device can be improved and the size can be reduced. For example, the sheet-like secondary battery 10 is suitable for use in devices that require design, such as wearable devices that require downsizing, electronic POP advertisements, guidance displays, card-type LEDs, reel-type LEDs, and the like. It is.

  As described above, the secondary battery 10 is cut by the cutter 52. In the present embodiment, a parting line is formed in the vicinity of the cut portion in order to prevent a short circuit between the electrodes at the time of cutting.

  Hereinafter, the dividing line provided in the vicinity of the cut portion will be described with reference to FIG. FIG. 3 is a top view and a cross-sectional view schematically showing the configuration of the delivered secondary battery 10. In FIG. 3, an XYZ three-dimensional orthogonal coordinate system is shown. The X direction is the delivery direction of the secondary battery 10, that is, the roll length direction. The Y direction is the roll width direction, and the Z direction is the thickness direction of the secondary battery 10.

  As shown in FIG. 3, the secondary battery 10 is provided with a plurality of dividing lines 33. In the XY plan view, each dividing line 33 is formed in a rectangular shape. The dividing line 33 is formed along the X direction and the Y direction. Specifically, the dividing line 33 is formed in a rectangular shape having the X direction as the long side direction and the Y direction as the short side direction. The dividing line 33 divides the charging layer 14, the p-type oxide semiconductor layer 16, and the second electrode 17. A region inside the rectangular dividing line 33 is defined as an inner region 36, and a region located outside is defined as an outer region 35. The inner region 36 is disposed so as to be included in the dividing line 33. The inner region 36 is formed in a rectangular shape.

  A plurality of rectangular dividing lines 33 are formed in the secondary battery 10. A plurality of rectangular dividing lines 33 are arranged at predetermined intervals in the roll length direction. Therefore, a plurality of inner regions 36 are formed side by side in the X direction. In FIG. 3, the size of the plurality of dividing lines 33 is the same, but may be different.

  The dividing line 33 can be formed by laser irradiation. Specifically, laser light is irradiated from the positive electrode layer 22 side, and the laser light is scanned along a rectangle. The dividing layer 33 divides the charging layer 14, the p-type oxide semiconductor layer 16, and the second electrode 17 into a pattern in the inner region 36 and a pattern in the outer region 35. That is, the charging layer 14 and the positive electrode layer 22 in the inner region 36 are separated from the charging layer 14 and the positive electrode layer 22 in the outer region 35. Although the dividing line 33 does not divide the n-type oxide semiconductor layer 13 in FIG. 3, the n-type oxide semiconductor layer 13 may be divided. That is, the dividing line 33 only needs to divide at least the charging layer 14 and the second electrode 17.

  In this way, the dividing line 33 is formed in the secondary battery 10. Then, the user cuts the secondary battery 10 at the cutting position (cutting line) 34. The secondary battery 10 is cut along the roll width direction. The cutting position 34 is formed in the outer region 35. In the XY plan view, the secondary battery 10 is cut along a straight line parallel to the Y direction at the cutting position 34. The secondary battery 10 is cut at the cutting position 34 between the two dividing lines 33. That is, the cutting position 34 is disposed between two adjacent inner regions 36.

  Thus, by forming the dividing line 33, a short circuit at the time of cutting can be prevented. That is, even when the substrate 11 is cut by a laser or a metal blade, a short circuit between the negative electrode layer 21 and the positive electrode layer 22 in the inner region 36 can be prevented. By forming a mark or the like as a mark at the X position between the inner regions 36, the user can easily determine the cutting position.

  Furthermore, the user who purchased the roll-shaped secondary battery 10 can cut the secondary battery 10 with a size according to the application. When the area corresponding to one inner region 36 is a unit area, the secondary battery 10 can be cut out with an area size N times the unit area (N is an integer of 1 or more). The battery capacity corresponding to the unit area is defined as the unit capacity.

  For example, when it is desired to obtain a battery capacity that is twice the unit capacity, the user cuts out the secondary battery 10 so that one sheet-like secondary battery 10 includes two inner regions 36. Specifically, among the three cutting positions 34 shown in the cross-sectional view of FIG. 3, at the middle cutting position 34, the secondary battery 10 is not cut, and the cutting position 34 on the left side (−X side) The cutter 52 cuts the secondary battery 10 at the cutting position 34 on the right side (+ X side). Thus, the two inner regions 36 are included in one sheet-like secondary battery 10. The sheet-like secondary battery 10 having a battery capacity twice the unit capacity can be manufactured. The user can manufacture the secondary battery 10 having a battery capacity N times the unit capacity. Therefore, the user can manufacture the secondary battery 10 having a desired size according to the application.

  Next, a method for manufacturing the secondary battery 10 according to the present embodiment will be described with reference to FIG. FIG. 4 is a flowchart showing a method for manufacturing the secondary battery 10.

  First, the laminate 20 having the laminate structure shown in FIG. 2 is manufactured (S11). That is, the n-type oxide semiconductor layer 13, the charging layer 14, the p-type oxide semiconductor layer 16, and the second electrode 17 are sequentially formed on the sheet-like base material 11. Thereby, the laminated body 20 used as the secondary battery 10 is prepared. S11 is a stacking step of stacking a charging layer having an n-type metal oxide material and an insulating material on the base material 11 (first electrode). It is preferable to manufacture the laminate 20 by a roll-to-roll method using a feeding unit and a winding unit.

  Next, the dividing line 33 is formed in the secondary battery 10 by laser irradiation (S12). For example, the sheet-like secondary battery 10 is irradiated with laser light by a laser processing apparatus such as a laser scribing apparatus. And a laser beam is scanned so that the irradiation position of the laser beam in the secondary battery 10 may be changed. Thereby, the dividing line 33 is formed in the secondary battery 10, and it becomes a structure as shown in FIG. The dividing line 33 reaches the surface of the n-type oxide semiconductor layer 13 so as to divide the second electrode 17, the p-type oxide semiconductor layer 16, and the charging layer 14. The n-type oxide semiconductor layer 13 and the base material 11 are not divided, but the n-type oxide semiconductor layer 13 may be divided.

  Specifically, by scanning the laser beam in the order of + X direction, + Y direction, −X direction, and −Y direction, a rectangular dividing line 33 as shown in the top view of FIG. 5 is formed. . The dividing line 33 can have a width of 40 μm to 150 μm, for example. The width of the dividing line 33 can be adjusted by the size of the laser beam spot. The dividing line 33 is preferably closed. Thereby, the charge layer 14 and the positive electrode layer 22 in the outer region 35 are formed as an integrated pattern. In order to make the dividing line 33 a closed shape, the start point and the end point of the laser irradiation may be matched.

Here, although an example of the process conditions of the laser processing for forming the dividing line 33 is shown below, it is not limited to the following process conditions.
Laser power: 0.236W (sample irradiation actual measurement value)
Laser spot diameter: 20 μm
Scanning speed: about 1000mm / sec

  And the adhesive layer 18 is formed in the base material 11 wound by roll shape (S13). Here, the pressure-sensitive adhesive layer 18 is applied to the entire second surface 11 b of the substrate 11. Next, the protective material layer 19 is formed on the base material 11 wound in a roll shape (S14). The protective material layer 19 is a release sheet and is bonded to almost the entire second electrode 17. The processes from S11 to S14 are performed on the battery manufacturer side of the secondary battery 10.

  The manufacturing process on the battery manufacturer side is not limited to the order shown in FIG. For example, you may perform the protective material layer formation process of S14 after the adhesive layer formation process of S13. Further, the dividing line forming step of S12 may be performed between the pressure-sensitive adhesive layer forming step of S13 and the protective material layer forming step of S14. Or the dividing line formation process of S12 may be implemented after the protective material layer formation process of S14.

  Further, the dividing line 33 may be formed by using a mask regardless of laser irradiation. For example, in the step of forming the second electrode 17, the p-type oxide semiconductor layer 16, and the charging layer 14, film formation using a mask is performed. The second electrode 17, the p-type oxide semiconductor layer 16, and the charging layer 14 may be formed in a state where the mask covers the position that becomes the dividing line 33. Further, the dividing line 33 may be formed by combining mask film formation and laser irradiation. For example, the dividing line 33 may be formed by forming the second electrode 17 and the p-type oxide semiconductor layer 16 using a mask and irradiating the charging layer 14 with laser light.

  And the step after S15 is performed by the user who purchased the secondary battery 10. Specifically, first, the user disconnects the secondary battery 10 (S15). As shown in FIG. 3, the cutter 52 cuts the secondary battery 10 at the cutting position 34 in the outer region 35. In the XY plan view, the secondary battery 10 is cut so that the cutting line does not intersect the dividing line 33A. Further, the user can cut out the secondary battery 10 with an area N times the unit area.

  Next, the protective material layer 19 which is a release sheet is peeled from the secondary battery 10 (S16). Then, terminals are respectively connected to the base material 11 and the second electrode 17 (S17). FIG. 6 is a cross-sectional view schematically showing the secondary battery 10 in a state where the terminal 38 and the terminal 39 are connected.

  The positive terminal 38 is connected to the upper surface of the second electrode 17. The surface of the second electrode 17 from which the protective material layer 19 has been peeled, that is, the surface of the second electrode 17 opposite to the p-type oxide semiconductor layer 16 side is in contact. The negative terminal 39 is connected to the first surface 11 a of the substrate 11. That is, the terminal 39 is connected to a location where the n-type oxide semiconductor layer 13 is not provided on the first surface 11 a of the substrate 11. In other words, the terminal 39 is in contact with the exposed portion of the base material (first electrode) 11 from the n-type oxide semiconductor layer 13 on the first surface 11 a of the base material 11.

  By doing in this way, the secondary battery 10 can be manufactured. As described above, the secondary battery 10 can be cut out so that the user has N times the unit area. Therefore, the degree of freedom can be given. When one sheet-like secondary battery 10 has two or more inner regions 36, the positive terminal 38 is connected in each inner region 36.

  The sheet-like secondary battery 10 having the above-described configuration can be manufactured in a shape corresponding to a device to be used. For example, in an electronic device incorporating a secondary battery, the sheet-like secondary battery 10 is cut according to the size of the case of the electronic device. Since the sheet-like secondary battery 10 can be set to a predetermined size, it is possible to improve the design and size of the electronic device. For example, the sheet-like secondary battery 10 is suitable for use in wearable devices and the like that need to be miniaturized, and devices that require design such as electronic POP advertisements.

  Furthermore, an adhesive layer 18 is formed on the second surface 11 b of the substrate 11. Thereby, the secondary battery 10 can be affixed on the case etc. of an electronic device. That is, the secondary battery 10 is fixed by attaching the secondary battery 10 to the inside of the case via the adhesive layer 18. Thereby, the secondary battery 10 can be easily installed in the case of an electronic device, and productivity can be improved.

  In addition, the battery manufacturer can ship and sell the secondary battery 10 in a roll shape. Since the secondary battery 10 is manufactured by a roll-to-roll method, even if it is wound in a roll shape, damage and performance degradation do not occur. Furthermore, you may ship the roll-shaped secondary battery 10 in the state which attached the secondary battery 10 to the holder which has the cutter 52. FIG. Thereby, the secondary battery 10 can be cut out immediately before use.

  It is good also as a peeling sheet which can peel the protective material layer 19 partially. For example, a perforation may be provided in the protective material layer 19 so that only the connection portion of the terminal 38 can be peeled off. Moreover, double-sided adhesion is possible by further forming a pressure-sensitive adhesive layer on the protective material layer 19. Thereby, it becomes possible to handle the secondary battery 10 like a double-sided tape.

Embodiment 2. FIG.
The configuration and manufacturing method of the secondary battery according to the second embodiment will be described with reference to FIGS. FIG. 7 is a flowchart showing a method for manufacturing the secondary battery 10A according to the second embodiment. 8 and 9 are diagrams schematically showing the configuration of the secondary battery 10A in each step.

  In the present embodiment, the process of forming the dividing line 33A is different from that of the first embodiment. Specifically, as shown in FIG. 7, the step of forming the dividing line 33A by laser irradiation (S24) includes the step of forming the protective material layer 19 (S23), and the step of cutting the secondary battery 10A (S25). Has been implemented during. Since the basic configuration and manufacturing method of the secondary battery 10A other than the dividing line 33A are the same as those in the first embodiment, the description thereof will be omitted as appropriate.

  Hereinafter, it demonstrates along the flowchart of FIG. First, the laminated body 20 is manufactured similarly to Embodiment 1 (S21). Next, the pressure-sensitive adhesive layer 18 is formed on the second surface 11 b of the substrate 11. Then, the protective material layer 19 is formed on the second electrode 17. By doing in this way, secondary battery 10A becomes the structure shown in FIG. Since the manufacturing process (S21) of the laminated body 20, the forming process (S22) of the pressure-sensitive adhesive layer 18, and the forming process (S23) of the protective material layer 19 are the same as S11, S13, and S14 of the first embodiment, they are described. Is omitted. The pressure-sensitive adhesive layer forming step of S22 may be performed after the protective material layer forming step of S23. The steps up to S23 are performed by the battery manufacturer.

  Next, the process on the user side will be described. First, the dividing line 33A is formed in the secondary battery 10A by laser irradiation (S24). In the present embodiment, laser light is irradiated from the protective material layer 19 side to scan the laser light. As a result, the configuration shown in FIG. 9 is obtained. The dividing line 33 </ b> A divides the protective material layer 19, the positive electrode layer 22, and the charging layer 14. In this embodiment, the laser beam is scanned along the Y direction. Therefore, the dividing line 33A crosses the secondary battery 10A in the roll width direction. The dividing line 33A is formed in a straight line parallel to the Y direction.

  As shown in FIG. 9, the two dividing lines 33A are arranged close to each other. Here, the area between the two dividing lines 33A arranged close to each other is the outer area 35A. The outer region 35A is a band-shaped region extending in the Y direction. A region between the two outer regions 35A is an inner region 36A. In the present embodiment, the dividing line 33 </ b> A is formed after the protective material layer 19 is formed. Therefore, the protective material layer 19 is also divided by the dividing line 33A. Therefore, the laser energy may be higher than that in the first embodiment.

  Then, the secondary battery 10A is disconnected (S25). Here, the cutter 52 cuts the secondary battery 10A at the cutting position 34 in the outer region 35A. Similar to Embodiment 1, secondary battery 10A is cut along a straight line parallel to the Y direction. That is, as shown in FIG. 10, the secondary battery 10A is cut along the roll width direction between two adjacent dividing lines 33A. In the XY plan view, the secondary battery 10A is cut so that the cutting line does not intersect the dividing line 33A.

  Next, the protective material layer 19 is peeled from the second electrode 17 (S26). Then, the terminal is connected to the base material 11 and the second electrode 17 (S27). Since the peeling process (S26) of the protective material layer 19 and the terminal connection process (S27) are the same as S16 and S17 in the first embodiment, the description thereof is omitted.

  In this way, the sheet-like secondary battery 10A is manufactured. Therefore, the same effect as in the first embodiment can be obtained. For example, a short circuit between the negative electrode layer 21 and the positive electrode layer 22 at the time of cutting can be prevented. Further, in the present embodiment, the dividing line 33A is formed on the user side. Therefore, the user can cut out the secondary battery 10A with an arbitrary size. The user can manufacture the secondary battery 10A having a desired size and battery capacity. In other words, the roll length from which the user cuts out the secondary battery 10A can be set to an arbitrary length according to the required battery capacity. In addition, the user can change the size of the secondary battery 10A for each sheet. One roll-shaped secondary battery 10A can be used for various applications. Furthermore, since the area of the outer region 35A can be reduced, the secondary battery 10A can be manufactured efficiently. Thereby, productivity can be improved.

  Also in Embodiment 2, the dividing line may be formed by mask film formation using a mask. Also in the second embodiment, a rectangular dividing line 33 may be formed as in the first embodiment. Alternatively, in the first embodiment, a linear dividing line 33A extending in the Y direction may be formed.

  As mentioned above, although an example of embodiment of this invention was demonstrated, this invention includes the appropriate deformation | transformation which does not impair the objective and advantage, Furthermore, the limitation by said embodiment is not received.

DESCRIPTION OF SYMBOLS 10 Secondary battery 11 Base material 13 N-type oxide semiconductor layer 14 Charging layer 16 P-type oxide semiconductor layer 17 2nd electrode 18 Adhesive layer 19 Protective material layer 20 Laminated body 21 Negative electrode layer 22 Positive electrode layer 33 Dividing line 34 Cutting Position 35 Outer area 36 Inner area 38 Terminal 39 Terminal 51 Reel 52 Cutter

Claims (12)

A substrate;
a charging layer comprising an n-type metal oxide material and an insulating material, formed on the first surface of the substrate;
An electrode formed on the charging layer;
A protective material layer formed on the electrode;
And a pressure-sensitive adhesive layer formed on the second surface of the substrate.   The laminate composed of the base material, the charging layer, the electrode, the protective material layer, and the pressure-sensitive adhesive layer is wound in a roll shape so that the protective material layer is on the outside. Secondary battery described in 1.   The secondary battery according to claim 1, wherein the protective material layer is a release sheet provided to be peelable from the electrode.   The secondary battery according to claim 1, wherein a dividing line for dividing the electrode and the charging layer is provided. The electrode on the charging layer is a positive electrode,
The base material becomes a negative electrode,
A p-type oxide semiconductor layer is formed between the positive electrode and the charging layer,
An n-type oxide semiconductor layer is formed between the negative electrode and the charging layer,
The secondary battery according to claim 4, wherein the charging layer, the p-type oxide semiconductor layer, and the electrode are divided by the dividing line. A laminate manufacturing process for manufacturing a laminate by sequentially laminating a charging layer having an n-type metal oxide material and an insulating material and an electrode on the first surface of the substrate,
An adhesive layer forming step of forming an adhesive layer on the second surface of the substrate;
A protective material layer forming step of forming a protective material layer on the electrode;
A dividing line forming step of forming a dividing line for dividing the electrode and the charging layer;
A method for manufacturing a secondary battery comprising:   The secondary battery according to claim 6, further comprising a cutting step of cutting the secondary battery along a roll width direction of the roll-shaped base material at a cutting position between the two adjacent dividing lines. Production method.   The method for manufacturing a secondary battery according to claim 6, wherein in the dividing line forming step, a dividing line is formed by laser irradiation.   The method for manufacturing a secondary battery according to claim 6, wherein the dividing line forming step is performed before the protective material layer forming step.   The method for manufacturing a secondary battery according to claim 6, wherein the dividing line forming step is performed after the protective material layer forming step. The protective material layer is formed of a release sheet,
The manufacturing method of the secondary battery of any one of Claims 6-10 further equipped with the peeling process which peels the said protective material layer from the said electrode after a cutting process. In the laminate,
The electrode becomes a positive electrode;
The base material becomes a negative electrode,
A p-type oxide semiconductor layer is formed between the positive electrode and the charging layer,
The method for producing a secondary battery according to claim 6, wherein an n-type oxide semiconductor layer is formed between the negative electrode and the charging layer.

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