JP2019008870A - Sheet secondary battery, battery structure, and manufacturing method of sheet secondary battery - Google Patents

Abstract

To provide a technique for efficiently arranging a sheet secondary battery.SOLUTION: A sheet secondary battery according to an embodiment of the present invention includes a base member 11 having a base portion 32 and an opening portion 31, a dividing line 33 surrounding the opening portion 31, an inner charging layer 14b formed on the base portion 32 of an inner region 36 of the dividing line 33 and an outer charging layer 14a regulated by the base portion 32 of an outer region 35 of the dividing line 33, and a second electrode 17 formed on the outer charging layer 14a. The outer charging layer 14a and the inner charging layer 14b are electrically insulated by the dividing line 33.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a technique for efficiently arranging sheet-like secondary batteries.

  Patent Document 1 discloses a sheet battery testing apparatus. In the test apparatus of Patent Literature 1, a sheet roll in which a sheet-like secondary battery is wound in a roll shape is used. 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 battery from a sheet roll, the sheet battery has a rectangular planar shape (simply a shape). By the way, there are a wide variety of applications using sheet 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.

  In particular, in an application that requires designability, a space for arranging the sheet-like secondary battery may be limited. Since the shape of the sheet-like secondary battery is determined by the standard, if there is a space limitation, the sheet-like secondary battery may not be arranged in the space. Therefore, it is desirable to efficiently arrange the sheet-like secondary battery in the application according to the design of the application.

  This invention is made | formed in view of said subject, and it aims at providing the technique for arrange | positioning a sheet-like secondary battery efficiently.

  A sheet-like secondary battery according to one aspect of the present embodiment includes a base having a base and an opening, a dividing line surrounding the opening, and an inner charging layer formed at a base of an inner region of the dividing line, And an outer charging layer formed at a base of an outer region of the dividing line, and an electrode formed on the outer charging layer, and the outer charging layer and the inner charging layer are electrically connected by the dividing line. Is electrically insulated.

  In the sheet-like secondary battery, the electrode on the outer charging layer serves as a positive electrode, and a base disposed at a lower portion of the outer charging layer serves as a negative electrode, at least between the positive electrode and the outer charging layer. A p-type oxide semiconductor layer may be formed, and an n-type oxide semiconductor layer may be formed between the negative electrode and the outer charging layer.

  A battery structure according to an aspect of the present embodiment includes the above-described sheet-shaped secondary battery, and a case that includes a convex portion disposed in the opening and holds the sheet-shaped secondary battery.

  A battery structure according to an aspect of the present embodiment includes a base having a base and an opening, a charging layer having an n-type metal oxide material and an insulating material formed on the base, and the charging layer. A sheet-like secondary battery provided with an electrode formed on the housing, and a case that includes a convex portion disposed in the opening and accommodates the sheet-like secondary battery.

  A method for manufacturing a sheet-like secondary battery according to one aspect of the present embodiment includes a charge layer forming step of forming a charge layer having an n-type metal oxide material and an insulating material on a base material, and penetrating the charge layer. A parting line forming step for forming parting lines to be performed.

  In the manufacturing method, the inner charging layer in the inner area of the dividing line and the outer area of the dividing line are irradiated on the charging layer with laser light in the dividing line forming step on the outer charging layer. The outer charging layer may be divided.

  Said manufacturing method may further comprise the opening part formation process which forms the opening part which penetrates the said charge layer and the said base material in the inner side area | region inside the said dividing line.

  The manufacturing method may further include an electrode forming step of forming an electrode on the outer charging layer using a mask that covers the dividing line after the opening forming step.

  The manufacturing method of the sheet-like secondary battery according to one aspect of the present embodiment includes a charging layer forming step of forming a charging layer having an n-type metal oxide material and an insulating material on a base material, And an electrode forming step for forming an electrode, and a dividing line forming step for forming a dividing line penetrating the electrode and the charging layer.

  Said manufacturing method may further comprise the opening part formation process which forms the opening part which penetrates the said electrode, the said charge layer, and the said base material in the inner side area | region inside the said dividing line.

  ADVANTAGE OF THE INVENTION According to this invention, the technique for arrange | positioning a sheet-like secondary battery efficiently can be provided.

It is a figure which shows the basic cross-sectional structure of a sheet-like battery. It is a top view which shows the structure of a sheet-like battery typically. It is the III-III sectional view taken on the line of FIG. It is sectional drawing which shows typically the battery structure body by which the sheet-like secondary battery is arrange | positioned at the case. 1 is a plan view schematically showing a battery structure according to Example 1. FIG. 6 is a plan view schematically showing a battery structure according to Example 2. FIG. 6 is a plan view schematically showing a configuration of a sheet battery according to Example 2. FIG. It is a flowchart which shows the manufacturing method of a sheet-like battery. It is sectional drawing which shows typically the structure of the sheet-like battery before opening part formation. It is a flowchart which shows the manufacturing method of the sheet-like battery concerning a modification. It is sectional drawing which shows typically the structure of the sheet-like battery after dividing line formation. It is sectional drawing which shows typically the structure of the sheet-like battery after opening part formation. It is sectional drawing which shows typically the structure of the sheet-like battery after positive electrode formation. It is a top view which shows an example of the shape of a parting line.

  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.

(Laminated structure of secondary battery)
The basic configuration of the secondary battery according to the present embodiment will be described below with reference to FIG. FIG. 1 is a cross-sectional view showing a basic laminated structure of a secondary battery. For clarity of explanation, the following drawings appropriately show an XYZ three-dimensional orthogonal coordinate system. The Z direction is the thickness direction (stacking direction) of a sheet-like secondary battery (hereinafter also simply referred to as a sheet-like battery), and the XY plane is a plane parallel to the sheet-like battery. In addition, in the XY plane, the sheet battery is rectangular, and the X direction and the Y direction are parallel to the edge of the sheet battery.

  In FIG. 1, a sheet battery 10 is a laminate in which an n-type oxide semiconductor layer 13, a charge layer 14, a p-type oxide semiconductor layer 16, and a second electrode 17 are laminated on a base material 11 in this order. Has 20.

  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.

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, titanium stearate, which is a precursor of titanium oxide, can be used, for example. 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, or 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 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 battery 10 includes the first electrode (base material 11), the first conductive oxide semiconductor layer (n-type oxide semiconductor layer 13 or p-type oxide semiconductor layer 16), the charging layer 14, the first Any structure in which the two-conductivity-type semiconductor layer (p-type oxide semiconductor layer 16 or n-type oxide semiconductor layer 13) and the second electrode 17 are stacked in this order may be used.

  Further, the sheet battery 10 includes a first electrode (base material 11), a first conductivity type oxide semiconductor layer (n-type oxide semiconductor layer 13 or p-type oxide semiconductor layer 16), a charge layer 14, a second conductivity type. A configuration including a layer other than the type 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.

(Embodiment)
The configuration of sheet battery 10 according to the present exemplary embodiment will be described with reference to FIGS. 2 and 3. 2 is a plan view showing the configuration of the sheet battery 10, and FIG. 3 is a cross-sectional view taken along the line III-III of FIG.

  The sheet battery 10 has a rectangular outer shape in the XY plan view. Moreover, the sheet-like battery 10 has the opening part 31 by which the inside was cut out. As shown in FIG. 3, the opening 31 passes through the second electrode 17, the p-type oxide semiconductor layer 16, the charging layer 14, the n-type oxide semiconductor layer 13, and the base material 11. In the XY plan view, the outer shape of the opening 31 is a rectangular shape, but may be an arbitrary shape such as a circular shape or a triangular shape. Here, a portion other than the opening 31 of the base material 11 is defined as a base 32. That is, the base portion 32 is a portion where the base material 11 is not cut out. The charging layer 14 and the like are formed on the base 32.

  Furthermore, a dividing line 33 is formed in the sheet battery 10. The dividing line 33 is formed in a rectangular shape so as to surround the opening 31. The dividing line 33 divides the charging layer 14 and the positive electrode layer 22. 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. For this reason, the inner region 36 is formed in a rectangular shape, and the outer region 35 is formed in a rectangular frame shape. The center of the inner region 36 coincides with the center of the opening 31. The charging layer 14 formed on the base 32 of the outer region 35 is referred to as an outer charging layer 14a, and the charging layer 14 formed on the base 32 of the inner region 36 is referred to as an inner charging layer 14b. The charging layer 14 is divided into an outer charging layer 14 a and an inner charging layer 14 b by a dividing line 33. The second electrode 17 formed on the outer charging layer 14a serves as the positive electrode, and the base 32 disposed below the outer charging layer 14a serves as the negative electrode.

  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. By the dividing line 33, the charging layer 14 and the positive electrode layer 22 are divided into a pattern in the inner region 36 and a pattern in the outer region 35. That is, the positive electrode layer 22 and the inner charging layer 14b in the inner region 36 have a pattern separated from the positive electrode layer 22 and the outer charging layer 14a in the outer region 35. In this manner, by forming the dividing line 33, the outer charging layer 14a of the outer region 35 and the inner charging layer 14b of the inner region 36 can be electrically insulated. Since the capacity of the sheet battery 10 is determined according to the area of the outer region 35, it is preferable to make the inner region 36 as small as possible.

  In this way, by forming the opening 31 in the inner region 36 of the sheet battery 10, the sheet battery 10 can be processed into a shape that matches the internal shape of the device in which the sheet battery 10 is to be installed. For example, when the case that accommodates the sheet battery 10 is uneven, the inner region 36 and the opening 31 are formed at locations corresponding to the protrusions. By doing in this way, according to the shape of an apparatus, the sheet-like battery 10 can be incorporated appropriately. There is no need to use the sheet battery 10 divided into a plurality of parts, and the number of connecting parts can be reduced. Therefore, the manufacturing cost can be reduced.

  The sheet battery 10 having the above-described configuration can be manufactured in a shape corresponding to the device to be used. For example, in an electronic device incorporating a secondary battery, the sheet battery 10 is produced according to the shape of the case of the electronic device. Since the sheet-like battery 10 can have an arbitrary shape, it is possible to improve the design of the electronic device and reduce the size. For example, the sheet-like battery 10 is suitable for use in a wearable device or the like that needs to be miniaturized, or a device that requires design such as an electronic POP advertisement.

  FIG. 4 shows a configuration of the sheet battery 10 accommodated in the case. FIG. 4 is a side cross-sectional view schematically showing the configuration of the battery structure 100 having the sheet battery 10. The battery structure 100 includes a case 50, a cover 60, and a sheet battery 10.

  The case 50 accommodates the sheet battery 10. The case 50 has a convex portion 51. And the convex part 51 is arrange | positioned in the opening part 31 of the sheet-like battery 10, and the sheet-like battery 10 is accommodated in the inside of the case 50. FIG. The cover 60 covers the front side (+ Z side) of the case 50. The cover 60 is attached to the case 50. Between the cover 60 and the case 50, the sheet battery 10 is held in an unfolded state.

  By doing in this way, even if the case 50 has an unevenness | corrugation, the sheet-like battery 10 can be accommodated in the inside of the case 50, without wasting space. By providing the opening 31 at a position corresponding to the shape of the case 50, the convex portion 51 of the case 50 can be avoided. Therefore, the sheet battery 10 can be held inside the case 50. In FIG. 4, since the number of the convex portions 51 is one, the number of the opening portions 31 is one, but the number of the convex portions 51 and the opening portions 31 may be two or more.

  By doing in this way, for example, it is not necessary to arrange the sheet battery 10 so as to avoid the convex portion 51 of the case 50. That is, there is no need to combine sheet batteries 10 having various shapes. Therefore, according to the present invention, since the integrated sheet-like battery 10 can be used, the number of connecting parts can be reduced. In addition, according to the present invention, the sheet-like battery 10 can be appropriately disposed in the case 50 having an arbitrary shape, so that the design of electronic equipment can be improved and the size can be reduced.

  As described above, the inner charging layer 14b in the inner region 36 is insulated from the outer charging layer 14a in the outer region 35, and power is supplied only to the outer charging layer 14a in the outer region 35. For this reason, the substantial battery capacity of the sheet battery 10 is determined by the total amount of the outer charging layer 14 a in the outer region 35. Therefore, the capacity of the outer region 35 is determined according to the battery capacity required for the electronic device in which the sheet-like battery 10 is disposed, and the number, size, and shape of the inner region 36 are determined. Furthermore, the battery capacity can be increased by stacking the sheet batteries 10. That is, when the battery capacity with respect to an electronic device is insufficient with one sheet-like battery 10, a plurality of sheet-like batteries 10 having the same shape are arranged to overlap each other. By doing in this way, the battery capacity required for an electronic device can be satisfy | filled.

Example 1
The configuration using the sheet battery according to Example 1 will be described with reference to FIG. FIG. 5 is a plan view schematically showing a configuration of a battery structure 100A using the sheet-like battery 10A according to the first example. Specifically, in the first embodiment, the sheet battery 10 is installed inside the keyboard of the computer (inside the case 50A). The keyboard on which the sheet-like secondary battery 10 is arranged may be wired or wireless. In FIG. 5, the dividing line 33 provided in the sheet battery 10A is omitted.

The sheet-like battery 10A has a size and shape that can be accommodated inside the case 50A. The case 50A defines the outer shape of the keyboard, and the center 50A has a plurality of convex portions 51 corresponding to the shape of the keyboard. For example, a character key or a numeric keypad of a keyboard is disposed on the convex portion 51. Therefore, the case 50A has a plurality of convex portions 51 corresponding to the number of keys. The sheet battery 10 </ b> A has a plurality of openings 31 so as to avoid the plurality of convex portions 51.
The planar shape of each opening 31 is square or rectangular according to the key shape. In the XY plan view, the opening 31 is formed larger than the convex portion 51. The convex portion 51 is disposed in the opening 31.

  Further, a positive tab lead 38 and a negative tab lead 39 are connected to the sheet battery 10A. For example, tab leads 38 and 39 are bonded to the end of the sheet battery 10. The tab leads 38 and 39 are connected to, for example, wiring or a circuit board (not shown). Thus, the sheet battery 10 can supply power to the keyboard and its wireless communication circuit.

  By doing in this way, it is not necessary to provide a space dedicated to the battery in the case 50a. For this reason, it is possible to improve the design of the electronic device with a built-in battery and to reduce the size. In particular, the design can be improved by making the opening 31 a shape corresponding to a character or a figure. Further, an integrated sheet battery 10A can be used according to the shape of the case 50a. Since a charge layer can be provided in the space between the convex parts 51, the space in case 50A can be utilized effectively. A sheet battery 10A having a battery capacity required by the electronic device can be accommodated in the case 50A.

(Example 2)
A sheet-like battery 10B and a battery structure 100B according to Example 2 will be described with reference to FIGS. 6 and 7. FIG. 6 is a plan view schematically showing the configuration of the battery structure 100B. FIG. 7 is a plan view schematically showing the configuration of a sheet battery 10B used in the battery structure 100B. In FIG. 6, the dividing line 33 provided in the sheet battery 10B is omitted.

  In Example 2, the sheet-like battery 10B is disposed on the numeric keypad portion of the keyboard. Similar to the first embodiment, the opening 31 of the sheet battery 10 </ b> B is disposed on the convex portion 51 of the case 50. The sheet battery 10 </ b> B includes a tab portion 41 that is drawn to the outside of the case 50. The tab portion 41 extends on the −Y side.

  As shown in FIG. 7, tab leads 38 </ b> B and 39 </ b> B are connected to the tab portion 41. The tab lead 38 </ b> B of the positive electrode is affixed to the surface of the sheet battery 10, and the tab lead 39 </ b> B is affixed to the back surface of the sheet battery 10. That is, the positive tab lead 38B is connected to the second electrode 17 (see FIG. 1), and the negative tab lead 39B is connected to the substrate 11 (see FIG. 1) as the first electrode. Also with the configuration of the second embodiment, the same effect as the first embodiment can be obtained.

(Production method)
Hereinafter, the manufacturing method of the sheet battery 10 according to the present embodiment will be described with reference to FIG. FIG. 8 is a flowchart showing a method for manufacturing the sheet battery 10.

  First, the n-type oxide semiconductor layer 13 is formed on the base material 11 that is the first electrode (S11). Moreover, when the base material 11 is an insulating material, after forming a 1st electrode (negative electrode) on the base material 11, the n-type oxide semiconductor layer 13 is formed. Next, the charge layer 14 is formed on the n-type oxide semiconductor layer 13 (S12). A p-type oxide semiconductor layer 16 is formed on the charging layer 14 (S13). A second electrode 17 is formed on the p-type oxide semiconductor layer 16 (S14).

  As described above, 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 stacked on the base material 11, thereby stacking the cross-sectional structure illustrated in FIG. 1. A body 20 is formed. In addition, the laminated body 20 should just be equipped with the base material 11, the charge layer 14, and the 2nd electrode 17 at least, and can abbreviate | omit or add a process suitably. For example, at least one of the n-type oxide semiconductor layer 13 and the p-type oxide semiconductor layer 16 may be omitted. In addition, a specific method for forming each layer is not described because the above-described method can be used.

  Next, the dividing line 33 is formed in the sheet-like battery 10 by laser irradiation (S15). For example, the sheet-shaped battery 10 is irradiated with laser light by a laser processing apparatus such as a laser scribing apparatus. Then, the laser beam is scanned so that the irradiation position of the laser beam in the sheet battery 10 is changed. Thereby, the dividing line 33 is formed in the sheet-like battery 10, and it becomes a laminated 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. Note that the n-type oxide semiconductor layer 13 may be divided.

  The dividing line 33 is formed so as to penetrate the charging layer 14. The dividing line 33 is formed in a closed shape. Specifically, the dividing line 33 is formed so as to surround a specific region where the opening 31 of the charging layer 14 is formed in the XY plan view. Thereby, the charging layer 14 is divided into the inner charging layer 14 b in the inner region 36 of the dividing line 33 and the outer charging layer 14 a in the outer region 35 of the dividing line 33. The inner charging layer 14B and the outer charging layer 14a are electrically insulated.

  Specifically, by scanning the laser light in the order of + X direction, + Y direction, −X direction, and −Y direction, the rectangular dividing line 33 as shown in FIG. 2 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

  Next, the opening 31 is formed in the sheet battery 10 (S16). Thereby, as shown in FIG. 3, the opening part 31 which penetrates the laminated body 20 is formed. The opening 31 is formed in the inner region 36 inside the dividing line 33 as described above. The opening 31 is smaller than the inner region 36 and does not protrude from the outer region 35.

  The opening 31 is formed, for example, by processing the stacked body 20 in the inner region 36 with a metal blade or the like. The opening 31 is formed by cutting out the base material 11, the inner charging layer 14 b, and the like having the metal blade in the inner region 36. Specifically, the opening 31 can be formed by ultrasonic cutting or the like. Alternatively, the opening 31 can be formed by laser processing. Since the charge layer 14 and the positive electrode layer 22 are separated into the inner region 36 and the outer region 35, a short circuit at the time of cutting can be prevented. That is, even when the base material 11 is penetrated by a laser or a metal blade, a short circuit between the negative electrode layer 21 and the positive electrode layer 22 in the outer region 35 can be prevented. The opening 31 may be performed by the user of the sheet battery 10. That is, the manufacturer of the sheet battery 10 carries out the steps up to S15 and ships the sheet battery 10. Then, the user of the sheet battery 10, that is, the manufacturer of the electronic device on which the sheet battery 10 is mounted may form the opening 31 according to the design of the electronic device.

(Modification 1 of manufacturing method)
A modification of the method for manufacturing the sheet battery 10 will be described with reference to FIG. FIG. 10 is a flowchart showing a manufacturing method according to the modification. In the modification, the second electrode 17 is formed after the opening 31 is formed. In addition, since each process is the same as the process mentioned above, description is abbreviate | omitted suitably.

  The n-type oxide semiconductor layer 13 is formed on the base material 11 that is the first electrode (S21). Moreover, when the base material 11 is an insulating material, after forming a 1st electrode (negative electrode) on the base material 11, the n-type oxide semiconductor layer 13 is formed. Next, the charge layer 14 is formed on the n-type oxide semiconductor layer 13 (S22). A p-type oxide semiconductor layer 16 is formed on the charging layer 14 (S23).

  And the dividing line 33 is formed in the p-type oxide semiconductor layer 16 and the charge layer 14 by laser irradiation (S24). As a result, the cross-sectional structure shown in FIG. 11 is obtained. Thus, in the modification, the dividing line 33 is formed before the second electrode 17 is formed. The dividing layer 33 divides the charging layer 14 into an inner charging layer 14b and an outer charging layer 14a.

  Next, the opening 31 is formed in the p-type oxide semiconductor layer 16, the charge layer 14, the n-type oxide semiconductor layer 13, and the base material 11 (S25). Thereby, the cross-sectional structure shown in FIG. 12 is obtained. The opening 31 is formed in the inner region 36 and penetrates the p-type oxide semiconductor layer 16, the inner charging layer 14 b, the n-type oxide semiconductor layer 13, and the base material 11. The opening 31 can be formed using the same method as in S16. A portion other than the opening 31 of the substrate 11 is used as the base 32.

  Next, the second electrode 17 is formed on the p-type oxide semiconductor layer 16 using a mask (S26). Specifically, as shown in FIG. 13, the second electrode 17 is formed by vapor deposition, sputtering, or the like with the mask 45 disposed on the p-type oxide semiconductor layer 16. The mask 45 is disposed in the inner region 36. The mask 45 is disposed so as to cover the dividing line 33. Further, the mask 45 is disposed so as to cover the opening 31. The second electrode 17 is formed in the outer region 35 that is not covered with the mask 45. That is, the second electrode 17 is formed on the outer charging layer 14a. When the second electrode 17 is formed, the sheet-like battery 10C is completed.

  In the first modification, the second electrode 17 is formed using the mask 45. Therefore, as shown in FIG. 13, the second electrode 17 may not be divided by the dividing line 33. That is, the second electrode 17 can be formed only in the outer region 35 by using the mask 45 that covers the inner region 36 and the dividing line 33. In such a manufacturing method, the same effect as described above can be obtained.

  In addition, about each manufacturing process, it is possible to change an order suitably. For example, in the flow of FIG. 10, the p-type oxide semiconductor layer 16 can be formed after the step of forming the opening 31 (S25). In this case, similarly to the second electrode 17, the p-type oxide semiconductor layer 16 may be formed using the mask 45.

  Alternatively, S25 and S26 may be interchanged. That is, after the second electrode 17 is formed using the mask 45, the opening penetrating the second electrode 17, the p-type oxide semiconductor layer 16, the charging layer 14, the n-type oxide semiconductor layer 13, and the base material 11. The part 31 may be formed in the stacked body 20.

  In addition, in the XY plan view, the shape of the dividing line 33 may not be a closed shape. For example, the dividing line 33 can be formed into an open shape by forming the dividing line 33 from the end of the substrate 11. FIG. 14 shows an example of a sheet battery 10D having an open-shaped dividing line 33D. As shown in FIG. 14, the dividing line 33 </ b> D has a U shape in the XY plan view, and the −Y side is an open portion. An open portion of the dividing line 33 </ b> D is provided at the end of the base material 11. Thus, even if the dividing line 33D is not closed, by arranging the dividing line 33D at the end of the base material 11, an inner charging layer formed in the inner region 36 inside the dividing line 33D, The outer charging layer formed outside the dividing line can be electrically insulated.

  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 Sheet battery 11 Base material 13 N-type oxide semiconductor layer 14 Charging layer 14a Outer charging layer 14b Inner charging layer 16 P-type oxide semiconductor layer 17 Second electrode 20 Stack 21 Negative electrode layer 22 Positive electrode layer 31 Opening portion 32 Base 33 dividing line 35 outer region 36 inner region 38 tab lead 39 tab lead 50 case 51 convex portion 60 cover

Claims (10)

A substrate having a base and an opening;
A dividing line surrounding the opening;
An inner charging layer formed at the base of the inner region of the dividing line; and an outer charging layer formed at the base of the outer region of the dividing line;
An electrode formed on the outer charging layer;
With
A sheet-like secondary battery in which the outer charging layer and the inner charging layer are electrically insulated by the dividing line. The electrode formed on the outer charging layer is a positive electrode,
The base formed at the bottom of the outer charging layer is a negative electrode,
at least,
A p-type oxide semiconductor layer is formed between the positive electrode and the outer charging layer,
The sheet-like secondary battery according to claim 1, wherein an n-type oxide semiconductor layer is formed between the negative electrode and the outer charging layer. A battery structure comprising: the sheet-like secondary battery according to claim 1; and a case that includes a convex portion disposed in the opening and holds the sheet-like secondary battery. A base material having a base and an opening, a charging layer having an n-type metal oxide material and an insulating material formed on the base, and an electrode formed on the charging layer. When,
A battery structure comprising: a convex portion disposed in the opening, and a case for accommodating the sheet-like secondary battery. A charge layer forming step of forming a charge layer having an n-type metal oxide material and an insulating material on a substrate;
And a dividing line forming step of forming a dividing line penetrating the charge layer.   The said dividing line formation process divides | segments the inner side charging layer of the inner area | region of the said dividing line, and the outer side charging layer of the outer area | region of the said dividing line by irradiating the said charging layer with a laser beam. A method for manufacturing a sheet-like secondary battery.   The sheet-shaped secondary battery according to claim 5, further comprising an opening forming step of forming an opening penetrating the charging layer and the base material in an inner region inside the dividing line. Production method.   8. The sheet-like two according to claim 7, further comprising an electrode forming step of forming an electrode on an outer charging layer outside the dividing line by using a mask covering the dividing line after the opening forming step. A method for manufacturing a secondary battery. A charge layer forming step of forming a charge layer having an n-type metal oxide material and an insulating material on a substrate;
Forming an electrode on the charge layer; and
And a dividing line forming step of forming a dividing line penetrating the electrode and the charging layer.   The manufacturing of the sheet-like secondary battery according to claim 9, further comprising an opening forming step of forming an opening penetrating the electrode, the charging layer, and the base material in an inner region inside the dividing line. Method.

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