WO2019230484A1

WO2019230484A1 - Secondary battery, laminate battery, and manufacturing method

Info

Publication number: WO2019230484A1
Application number: PCT/JP2019/019996
Authority: WO
Inventors: 秀憲安藤; 佳亮溝江; 伸明高木
Original assignee: 株式会社日本マイクロニクス
Priority date: 2018-05-31
Filing date: 2019-05-21
Publication date: 2019-12-05
Also published as: JP2019212382A; TW202005159A

Abstract

Provided is a technology for allowing thinning of a secondary battery in which sheet-like batteries are laminated. A secondary battery (110) according to this embodiment is provided with: a first sheet-like battery (111) that has a first electrode and a second electrode; a second sheet-like battery (112) that has a first electrode and a second electrode and that is disposed opposite to the first sheet-like battery (111) such that the second electrodes (17a), (17b) oppose each other; a lead-out electrode (125) that is disposed between the second electrode (17a) of the first sheet-like battery (111) and the second electrode (17b) of the second sheet-like battery (112); a first conductive adhesive (121) that connects the second electrode (17a) of the first sheet-like battery (111) and the lead-out electrode (125) to each other; and a second conductive adhesive (122) that connects the second electrode (17b) of the second sheet-like battery (112) and the lead-out electrode (125) to each other. In an XY-planar view, the first conductive adhesive (121) and the second conductive adhesive (122) are arranged so as to be shifted from each other.

Description

Secondary battery, laminated battery, and manufacturing method

The present invention relates to a technique for thinning a secondary battery in which a plurality of sheet batteries are stacked.

Patent Document 1 discloses a stacked battery in which a plurality of sheet batteries are stacked. In Patent Document 1, two sheet batteries are arranged so that the second electrodes face each other. The sheet battery has a tab portion. A tab lead is connected to the tab portion.

JP 2017-123230 A

In a secondary battery in which a plurality of sheet batteries are stacked, it is desired to make them thinner.

The present invention has been made in view of the above-described problems, and an object thereof is to provide a technique for thinning a secondary battery in which a plurality of sheet batteries are stacked.

A secondary battery according to an aspect of the present embodiment includes a first sheet-like battery having a first electrode and a second electrode, a first electrode, and a second electrode, such that the second electrodes face each other. A second sheet-shaped battery disposed opposite to the first sheet-shaped battery, and an extraction electrode disposed between the second electrode of the first sheet-shaped battery and the second electrode of the second sheet-shaped battery. A first conductive adhesive that connects the second electrode and the extraction electrode of the first sheet battery, and a second that connects the second electrode and the extraction electrode of the second sheet battery. A conductive adhesive, and the first conductive adhesive and the second conductive adhesive in a plan view in a state where the first sheet battery and the second sheet battery are disposed to face each other. Are arranged out of position.

In the above secondary battery, a plurality of first conductive adhesives are disposed between the extraction electrode and the second electrode of the first sheet-shaped battery, and the extraction electrode and the first sheet-shaped A plurality of second conductive adhesives are disposed between the second electrodes of the battery, and in a plan view in a state where the first sheet-shaped battery and the second sheet-shaped battery are disposed to face each other, It is preferable that the first conductive adhesive and the second conductive adhesive are alternately arranged.

In the above secondary battery, it is preferable that the first conductive adhesive and the second conductive adhesive are alternately arranged along the longitudinal direction of the extraction electrode.

In the above secondary battery, the first sheet-shaped battery and the second sheet-shaped battery have a tab portion, and the plane in a state where the first sheet-shaped battery and the second sheet-shaped battery are arranged to face each other. In view, the tab portion of the first sheet battery and the tab portion of the second sheet battery overlap, and the tab portion of the first sheet battery and the second sheet battery are tab portions. It is preferable that the first electrodes are arranged so as to face each other.

The laminated battery according to the present embodiment includes the above-described secondary battery as a sheet-like battery pair, and includes a plurality of the sheet-like battery pairs so that the first electrodes of two adjacent sheet-like battery pairs face each other. A plurality of the sheet-like battery pairs are stacked, and the first sheet-like battery and the second sheet-like battery are arranged to face each other when viewed in a plan view. The first conductive adhesive and the second conductive adhesive thus formed are shifted from each other.

The manufacturing method of the secondary battery which concerns on 1 aspect of this embodiment is a process of apply | coating a 1st conductive adhesive on the said 2nd electrode of the 1st sheet-like battery which has a 1st electrode and a 2nd electrode. A step of connecting an extraction electrode to the first conductive adhesive, a step of applying a second conductive adhesive on the extraction electrode, a second sheet having the first electrode and the second electrode Connecting the second electrode of the battery to the second conductive adhesive, and in a plan view of the state where the first sheet battery and the second sheet battery are disposed facing each other, The first conductive adhesive and the second conductive adhesive are shifted from each other.

In the above secondary battery manufacturing method, a plurality of first conductive adhesives are disposed between the extraction electrode and the second electrode of the first sheet-like battery, and the extraction electrode and the first electrode A plurality of second conductive adhesives are arranged between the second electrodes of one sheet-like battery, and the plane in a state where the first sheet-like battery and the second sheet-like battery are arranged to face each other. In view, it is preferable that the first conductive adhesive and the second conductive adhesive are alternately arranged.

In the method for manufacturing a secondary battery, it is preferable that the first conductive adhesive and the second conductive adhesive are alternately arranged along the longitudinal direction of the extraction electrode.

In the above secondary battery manufacturing method, the first sheet-shaped battery and the second sheet-shaped battery have a tab portion, and the first sheet-shaped battery and the second sheet-shaped battery are arranged to face each other. In a plan view of the state, the tab portion of the first sheet battery and the tab portion of the second sheet battery overlap, and the tab portion of the first sheet battery and the second sheet battery are tabs. In the part, it is preferable that the first electrodes are arranged so as to face each other.

The manufacturing method of the laminated battery according to the present embodiment includes a step of manufacturing a plurality of the secondary batteries to be a sheet-like battery pair by the above-described method of manufacturing a secondary battery, and two adjacent sheet-like battery pairs. And laminating a plurality of the sheet-like battery pairs so that the first electrodes face each other, and the first sheet-like battery and the second sheet-like battery are arranged facing each other in plan view. In such a case, the first conductive adhesive and the second conductive adhesive provided in the plurality of sheet-like battery pairs are arranged so as to be shifted.

According to the present invention, it is possible to provide a technique for thinning the secondary battery.

It is a figure which shows the cross-section of a sheet-like battery. It is a top view which shows the structure of a sheet-like battery. 1 is a cross-sectional view showing a configuration of a secondary battery according to a first embodiment. It is XY top view which shows typically the structure of a part of secondary battery. It is XY top view which shows typically the structure of a part of secondary battery. 3 is an XY plan view schematically showing the arrangement of a first conductive adhesive 121 and a second conductive adhesive 122. FIG. It is sectional drawing which shows the laminated structure of a comparative example. FIG. 7 is a flowchart showing a manufacturing process of the secondary battery. It is sectional drawing which shows the structure of the secondary battery concerning this Embodiment 2. FIG. It is a top view which shows typically arrangement | positioning of the conductive adhesive in each sheet-like battery pair. It is XY top view which shows typically arrangement | positioning of all the conductive adhesives.

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.
(Laminated structure of sheet batteries)
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 sheet-like 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. The Z direction will be described as the vertical direction.

In FIG. 1, a sheet battery 10 includes 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 in this order on a substrate 11. 20. A region where 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 on the base material 11 is defined as a stacked portion 31, and the outside is a peripheral portion. This is part 32. The peripheral edge 32 is a region where the base material 11 is exposed on the + Z side.

The base material 11 is formed of a conductive material such as metal and functions as a first electrode (negative electrode). In this embodiment, the base material 11 is a negative electrode. As the base material 11, for example, a metal foil sheet such as a stainless steel (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 by the same method as the second electrode 17 described later.

Examples of the method for forming the first electrode include vapor deposition 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.

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.

For example, the n-type oxide semiconductor layer 13 can be formed on the substrate 11 by sputtering or the like. For example, a titanium dioxide film can be formed by reactive sputtering using titanium as a target. In reactive sputtering, for example, oxygen gas and argon gas can be used.

A charge layer 14 is formed on the n-type oxide semiconductor layer 13. The charging layer 14 includes an insulating material. As this insulating material, a silicone resin can be used. 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. Therefore, the charge layer 14 contains silicon oxide (SiO _x ) as an insulating material.

Further, the charging layer 14 includes an n-type oxide semiconductor material in addition to the insulating material. That is, the charging layer 14 is formed of a mixture obtained by mixing an insulating material and an n-type oxide semiconductor material. For example, a fine-particle n-type oxide semiconductor can be used as the n-type oxide semiconductor material. The n-type oxide semiconductor becomes a layer having a charging function when irradiated with ultraviolet rays.

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

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

For example, the charge layer 14 is formed of silicon oxide and titanium dioxide using 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, etc., 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.

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.

A second electrode 17 is formed on the p-type oxide semiconductor layer 16. The second electrode 17 functions as a positive electrode. 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.

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 battery 10 includes the first electrode (base material 11), the first oxide semiconductor layer (n-type oxide semiconductor layer 13 or p-type oxide semiconductor layer 16), the charging layer 14, the second oxidation. Any structure in which the physical 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-like battery 10 includes a first electrode (base material 11), a first oxide semiconductor layer (n-type oxide semiconductor layer 13 or p-type oxide semiconductor layer 16), a charging layer 14, and a second oxide semiconductor. A structure including a layer other than the layer (p-type oxide semiconductor layer 16 or n-type oxide semiconductor layer 13) and the second electrode 17 may be used.

In the laminate 20 shown in FIG. 1, some layers may be omitted, or other layers may be added. For example, an aluminum compound layer may be added between the charging layer 14 and the p-type oxide semiconductor layer 16. For example, aluminum compounds are Al ₂ O ₃ (aluminum oxide), AlN (aluminum nitride), AlON (aluminum oxynitride), Al (OH) ₃ (aluminum hydroxide), and SiAlON (silicon-alumina nitride). It is preferable that at least one of them is included. Furthermore, a layer containing nickel hydroxide may be added between the p-type oxide semiconductor layer 16 and the charging layer 14.

(Plane configuration)
Next, the planar configuration of the sheet battery 10 will be described. FIG. 2 is an XY plan view showing the configuration of the sheet battery 10. As shown in FIG. 2, the sheet battery 10 includes a rectangular portion 10a and a tab portion 10b. The rectangular portion 10a is a portion that is rectangular in the XY plan view. The tab part 10b protrudes to the + X side of the rectangular part 10a.

The laminated part 31 is provided in the rectangular part 10a. In the XY plan view, the laminated portion 31 has a rectangular shape, and a peripheral edge portion 32 is provided outside the laminated portion 31. In the stacked portion 31, the second electrode 17 is exposed on the + Z side (see also FIG. 1). In the peripheral part 32, the base material 11 is exposed on the + Z side (see also FIG. 1). In the tab portion 10b, the base material 11 is exposed on the + Z side.

(Laminated battery)
The secondary battery according to the present embodiment has a structure in which sheet batteries as shown in FIGS. 1 and 2 are stacked. That is, the secondary battery is a laminated battery in which two or more sheet batteries 10 are laminated. The configuration of the secondary battery 110 according to the present embodiment will be described. FIG. 3 is a cross-sectional view schematically showing the configuration of the secondary battery 110. 4 and 5 are XY plan views schematically showing a partial configuration of the secondary battery 110.

3 to 5, one of the two sheet batteries is a first sheet battery 111, and the other is a second sheet battery 112. The 1st sheet-like battery 111 The 2nd sheet-like battery 112 has the structure shown in FIG. 1 and FIG. 2, respectively. The first sheet battery 111 and the second sheet battery 112 are connected in parallel.

First, the configuration of the secondary battery 110 will be described with reference to FIG. As shown in FIG. 3, the secondary battery 110 includes a sheet battery 111, a sheet battery 112, a first conductive adhesive 121, a second conductive adhesive 122, an extraction electrode 125, and an insulating material. 128.

The secondary battery 110 has a configuration in which a first sheet battery 111 and a second sheet battery 112 are stacked. The thickness of the 1st sheet-like battery 111 and the 2nd sheet-like battery 112 is 12 micrometers, for example. The first sheet-like battery 111 and the second sheet-like battery 112 each have the laminated structure shown in FIG. 1, but are simplified as appropriate. Specifically, the n-type oxide semiconductor layer 13, the charge layer 14, and the p-type oxide semiconductor layer 16 are omitted.

The first sheet-like battery 111 includes a base material 11a and a second electrode 17a, which correspond to the base material 11 and the second electrode 17 shown in FIGS. ing. Similarly, the 2nd sheet-like battery 112 has the base material 11b and the 2nd electrode 17b, and these correspond to the base material 11 and the 2nd electrode 17 which were shown by FIG.1 and FIG.2. ing. As described above, the first sheet battery 111 and the second sheet battery 112 are connected in parallel. Therefore, the base material 11b and the base material 11a are connected, and the second electrode 17a and the second electrode 17b are connected.

The first sheet-shaped battery 111 has a rectangular portion 111a and a tab portion 111b, which correspond to the rectangular portion 10a and the tab portion 10b shown in FIG. The second sheet-like battery 112 has a rectangular portion 112a and a tab portion 112b, which correspond to the rectangular portion 10a and the tab portion 10b shown in FIG.

The first sheet battery 111 is disposed on the −Z side, and the second sheet battery 112 is disposed on the + Z side. The first sheet-shaped battery 111 and the second sheet-shaped battery 112 have the same size and the same shape. And the rectangular part 111a and the rectangular part 112a overlap in XY plane. Furthermore, the tab part 111b and the tab part 112b overlap in the XY plane.

The first sheet-shaped battery 111 and the second sheet-shaped battery 112 are disposed to face each other so that the

second electrodes

17a and 17b face each other. In the first sheet-like battery 111, the second electrode 17a is disposed on the + Z side, and the base material 11a is disposed on the −Z side. On the other hand, in the second sheet-like battery 112, the second electrode 17b is disposed on the −Z side, and the base material 11b is disposed on the + Z side. That is, the second sheet-like battery 112 has a stacked configuration in which the stacked body 20 shown in FIG. 1 is turned upside down.

Between the first sheet-like battery 111 and the second sheet-like battery 112, an extraction electrode 125 is disposed. The extraction electrode 125 connects the second electrode 17 a of the first sheet battery 111 and the second electrode 17 b of the second sheet battery 112. The extraction electrode 125 is, for example, a metal sheet. The thickness of the extraction electrode 125 is, for example, 10 μm.

The extraction electrode 125 is drawn from between the first sheet battery 111 and the second sheet battery 112 to the outside of the first sheet battery 111 and the second sheet battery 112. Specifically, the extraction electrode 125 is extracted to the −X side from between the first sheet battery 111 and the second sheet battery 112. That is, the extraction electrode 125 is extracted from the laminated portion 31 through the peripheral edge portion 32 to the outside of the first sheet battery 111 and the second sheet battery 112. The extraction electrode 125 is a metal sheet having a rectangular shape in which the X direction is the longitudinal direction and the Y direction is the short direction (see also FIG. 4).

A first conductive adhesive 121 is disposed between the extraction electrode 125 and the first sheet battery 111. The extraction electrode 125 and the second electrode 17 a of the first sheet battery 111 are electrically connected via the first conductive adhesive 121. The thickness of the first conductive adhesive 121 is, for example, 10 μm.

A second conductive adhesive 122 is disposed between the extraction electrode 125 and the second sheet battery 112. The extraction electrode 125 and the second electrode 17 b of the second sheet battery 112 are electrically connected via the first conductive adhesive 121. The thickness of the second conductive adhesive 122 is, for example, 10 μm.

The extraction electrode 125 electrically connects the second electrode 17 a of the second sheet battery 112 to the second electrode 17 b of the second sheet battery 112. Moreover, the tab part 111b of the 1st sheet-like battery 111 and the tab part 112b of the 2nd sheet-like battery 112 are connected. The base material 11a is exposed at the tab portion 111b, and the base material 11b is exposed at the tab portion 112b. Therefore, in the location where the

tab parts

111b and 112b overlap, the base material 11a and the base material 11b, which are the first electrodes, are arranged to face each other.

Thereby, the first sheet battery 111 and the second sheet battery 112 are connected in parallel. Note that the tab portion 111b and the tab portion 112b can be connected by crimping or ultrasonic welding. Alternatively, the tab portion 111b and the tab portion 112b may be connected using a conductive adhesive. Thus, the tab part 111b of the 1st sheet-like battery 111 and the tab part 112b of the 2nd sheet-like battery 112 overlap. Therefore, the

base materials

11a and 11b to be the first electrodes can be easily connected.

Further, an insulating material 128 is provided around the extraction electrode 125 in the peripheral portion 32 on the −X side. The insulating material 128 is disposed between the first sheet battery 111 and the extraction electrode 125. Further, the insulating member 128 is disposed between the second sheet battery 112 and the extraction electrode 125. The insulating member 128 is disposed at a position where the

base materials

11 a and 11 b are exposed and the

base materials

11 a and 11 b are opposed to the extraction electrode 125. In other words, the insulating material 128 is disposed at a location where the peripheral edge portion 32 and the extraction electrode 125 face each other. By applying the insulating material 128 to the extraction electrode 125 at a position corresponding to the peripheral edge portion 32, it is possible to prevent the base material 11 a and the base material 11 b that are the first electrodes from being short-circuited with the extraction electrode 125.

The insulating material 128 is formed so as to cover a part of the extraction electrode 125. Or the insulating material 128 may be apply | coated on the

base materials

11a and 11b. The insulating material 128 is coated by vapor deposition or spray application. As the insulating material 128, for example, a resin film such as polyimide can be used. The insulating material 128 preferably has elasticity. The thickness of the insulating material 128 is 10 μm.

Next, the arrangement of the second conductive adhesive 122 will be described with reference to FIG. FIG. 4 is an XY plan view showing a partial configuration of the secondary battery 110. More specifically, FIG. 4 is a top view showing the configuration of the secondary battery 110 with the second sheet battery 112 removed.

As shown in FIG. 4, a plurality of second conductive adhesives 122 are arranged on the extraction electrode 125. Ten second conductive adhesives 122 are provided in a staggered arrangement. Here, the second conductive adhesives 122 are arranged in two rows. In each row, five second conductive adhesives 122 are provided. The + Y side column is the first column and the -Y side column is the second column.

The positions of the second conductive adhesive 122 in the first row and the second conductive adhesive 122 in the second row are shifted in the X direction. Specifically, from the −X side to the + X side, the second conductive adhesive 122 in the second column and the second conductive adhesive in the first column, starting from the second conductive adhesive 122 in the second column. The adhesives 122 are alternately arranged one by one.

Next, the arrangement of the first conductive adhesive 121 will be described with reference to FIG. FIG. 4 is an XY plan view showing a partial configuration of the secondary battery 110. More specifically, FIG. 4 is a top view showing the configuration of the secondary battery 110 from which the second sheet battery 112, the extraction electrode 125, and the insulating member 128 are removed.

As shown in FIG. 5, a plurality of first conductive adhesives 121 are disposed on the second electrode 17 a of the first sheet battery 111. In FIG. 5, ten first conductive adhesives 121 are provided in a staggered arrangement. Here, the first conductive adhesives 121 are arranged in two rows. In each row, five first conductive adhesives 121 are provided. The + Y side column is the first column and the -Y side column is the second column.

The positions of the first conductive adhesive 121 in the first row and the first conductive adhesive 121 in the second row are shifted in the X direction. Specifically, from the −X side to the + X side, the first conductive adhesive 121 in the first row and the first conductive adhesive 121 in the second row starting from the first conductive adhesive 121 in the first row. The adhesives 121 are alternately arranged one by one.

FIG. 6 is a top view schematically showing the arrangement of the first conductive adhesive 121 and the second conductive adhesive 122 in the XY plane. In FIG. 6, the extraction electrode 125 and the second sheet battery 112 are omitted. As shown in FIG. 6, the first conductive adhesive 121 and the second conductive adhesive 122 are arranged so as to be shifted in the XY plan view. Specifically, the first conductive adhesive 121 is disposed so as not to overlap with the second conductive adhesive 122. Further, the second conductive adhesive 122 is disposed so as not to overlap with the first conductive adhesive 121.

In the arrangement in the first row, the first conductive adhesive 121 and the second conductive adhesive 122 are alternately placed one by one from the −X side toward the + X side, starting with the first conductive adhesive 121. Has been placed. In the second row, the second conductive adhesive 122 and the first conductive adhesive 121 are alternately arranged one by one from the −X side toward the + X side, starting with the second conductive adhesive 122. ing.

Thus, in the XY plan view, the first conductive adhesive 121 and the second conductive adhesive 122 are arranged so as not to overlap. That is, in the XY plan view, the first conductive adhesive 121 and the second conductive adhesive 122 are arranged so as not to overlap. By doing in this way, the increase in the thickness of the secondary battery 110 can be prevented.

FIG. 7 is a cross-sectional view schematically showing a laminated structure of the secondary battery 110A according to the comparative example. In FIG. 7, a conductive tape 151 is provided between the extraction electrode 125 and the first sheet battery 111. In addition, a conductive tape 152 is provided between the extraction electrode 125 and the second sheet battery 112. The conductive tape 151 and the conductive tape 152 are overlapped.

For example, the thickness of each of the

conductive tapes

151 and 152 is 25 μm. In the comparative example of FIG. 7, since the

conductive tapes

151 and 152 overlap, the thickness (50 μm) of the two

conductive tapes

151 and 152 increases.

In the present embodiment, the first conductive adhesive 121 and the second conductive adhesive 122 do not overlap. Therefore, the total thickness of the secondary battery 110 increases only by one thickness (10 μm) of the conductive adhesive 121 or the second conductive adhesive 122. According to the present embodiment, the thickness of the secondary battery 110 can be reduced by 40 (= 50-10) μm compared to the configuration of FIG.

Thus, in the present embodiment, the first conductive adhesive 121 and the second conductive adhesive 122 are arranged so as to be shifted. For this reason, an increase in thickness due to the overlapping of the conductive adhesive can be prevented, and the secondary battery 110 can be thinned.

In addition, in the XY plan view, the first conductive adhesive 121 and the second conductive adhesive 122 are arranged in a staggered manner, whereby the bonded portions can be dispersed. As shown in FIG. 6, the first conductive adhesive 121 and the second conductive adhesive 122 are alternately arranged along the X direction. The 1st sheet-like battery 111 and the 2nd sheet-like battery 112 can be adhere | attached reliably, and peeling of the 1st sheet-like battery 111 and the 2nd sheet-like battery 112 can be prevented.

Next, a method for manufacturing the secondary battery 110 according to the present embodiment will be described with reference to FIG. FIG. 8 is a flowchart showing a method for manufacturing the secondary battery 110. In addition, since the connection method of the base material 11a used as the 1st electrode and the base material 11b is not specifically limited, it is abbreviate | omitted.

First, the first conductive adhesive 121 is applied on the second electrode 17a of the first sheet battery 111 (S11). For example, the dispenser applies the first conductive adhesive 121 to a predetermined size and a predetermined position. Here, the dispenser controls the application amount and the application position. Here, in the XY plan view, the dispenser applies the first conductive adhesive 121 to the upper surface of the second electrode 17a so that the first conductive adhesive 121 has a circular shape with a diameter of 0.64 μm. As a result, the configuration shown in FIG. 5 is obtained.

Next, the extraction electrode 125 is attached to the first sheet-like battery 111 through the first conductive adhesive 121 (S12). Specifically, the extraction electrode 125 is pressed toward the first sheet battery 111. As a result, the first conductive adhesive 121 is pressed against the first sheet battery 111 and deformed. An extraction electrode 125 is connected to the first conductive adhesive 121, and the extraction electrode 125 is bonded to the first sheet battery 111. Therefore, the second electrode 17 a and the extraction electrode 125 of the first sheet battery 111 are connected via the first conductive adhesive 121.

In the XY plan view, the deformed first conductive adhesive 121 is, for example, a circle having a diameter of 1.5 mm. Further, the thickness (height) of the first conductive adhesive 121 after deformation is, for example, 10 μm. The extraction electrode 125 can be fixed to the first sheet battery 111 by curing the first conductive adhesive 121.

Next, the second conductive adhesive 122 is applied on the extraction electrode 125 (S13). The dispenser used in S11 applies the second conductive adhesive 122 to the upper surface of the extraction electrode 125. Here, the second conductive adhesive 122 is disposed so as not to overlap the first conductive adhesive 121 in the XY plan view (see also FIG. 6). As a result, the configuration shown in FIG. 4 is obtained. As for the application size of the second conductive adhesive 122, the first conductive adhesive 121 is similarly circular with a diameter of 0.64 μm.

And the 2nd sheet-like battery 112 is affixed on the extraction electrode 125 (S14). The second sheet battery 112 is pressed toward the first sheet battery 111. Accordingly, the second conductive adhesive 122 is pressed against the first sheet battery 111 and deformed. The extraction electrode 125 is connected to the second conductive adhesive 122, and the second sheet battery 112 is bonded to the extraction electrode 125 on the first sheet battery 111. Therefore, the second electrode 17 b of the second conductive adhesive 122 and the extraction electrode 125 are connected via the second conductive adhesive 122.

In the XY plan view, the size of the deformed second sheet battery 112 is about 1.5 μm, similar to the first conductive adhesive 121. The second sheet-like battery 112 can be fixed to the extraction electrode 125 by curing the second conductive adhesive 122.

Thus, the secondary battery 110 in which the pair of

sheet batteries

111 and 112 are stacked is completed. The first conductive adhesive 121 and the second conductive adhesive 122 are shifted from each other when viewed in a plan view in a state where the first sheet battery 111 and the second sheet battery 112 are arranged to face each other. Therefore, the thin secondary battery 110 can be manufactured.

Embodiment 2. FIG.
In this embodiment, the secondary battery 110 having the structure shown in Embodiment 1 is further stacked. Specifically, the secondary battery 110 having a pair of sheet batteries is used as a sheet battery pair, and a plurality of sheet battery pairs are stacked. Therefore, the description of the sheet-like battery pair will be omitted as appropriate.

The laminated battery 200 according to the present embodiment will be described with reference to FIGS. FIG. 9 is a cross-sectional view showing the configuration of the laminated battery 200. FIG. 10 is a schematic diagram for explaining the arrangement of the conductive adhesive in each layer. In this embodiment, the secondary battery 110 of Embodiment 1 is stacked. Specifically, the secondary battery 110 is connected in parallel as a sheet-like battery pair. By doing in this way, a large capacity secondary battery can be provided.

The laminated battery 200 has five sheet-like battery pairs 201-205. Each of the sheet-like battery pairs 201 to 205 corresponds to the secondary battery 110 shown in the first embodiment. Therefore, the laminated battery 200 is constituted by five layers of sheet-like battery pairs 201 to 205.

The arrangement of the first conductive adhesive 121 and the second conductive adhesive 122 is one of the technical features. Since the basic configuration of the sheet-like battery pairs 201 to 205 is the same as that of the secondary battery 110 shown in Embodiment 1, the description thereof is omitted.

The sheet-like battery pair 201, the sheet-like battery pair 202, the sheet-like battery pair 203, the sheet-like battery pair 204, and the sheet-like battery pair 205 are stacked in order from the -X side. Two sheet batteries included in the sheet battery pair 201 are referred to as a first sheet battery 211a and a second sheet battery 212a. The first sheet battery 211a corresponds to the first sheet battery 111 of the first embodiment, and the second sheet battery 212a corresponds to the second sheet battery 112.

The two sheet batteries included in the sheet battery pair 202 are referred to as a first sheet battery 211b and a second sheet battery 212b. The two sheet batteries included in the sheet battery pair 203 are referred to as a first sheet battery 211c and a second sheet battery 212c. The two sheet batteries included in the sheet battery pair 204 are referred to as a first sheet battery 211d and a second sheet battery 212d. The two sheet batteries included in the sheet battery pair 205 are a first sheet battery 211e and a second sheet battery 212e.

As described above, the laminated battery 200 includes the five sheet-like batteries 211a to 211e and the five sheet-like batteries 212a to 212e. Therefore, in the laminated battery 200, ten sheet-like batteries 211a to 211e and 212a to 212e are laminated.

As shown in Embodiment 1, in each of the sheet-like battery pairs 201 to 205, the second electrodes are arranged so as to face each other. Therefore, in the two adjacent sheet-like battery pairs, the base materials that are the first electrodes are arranged so as to face each other.

The extraction electrodes included in the sheet batteries 201 to 205 are referred to as extraction electrodes 125a to 125e, respectively. Similarly, the first conductive adhesives included in the sheet batteries 201 to 205 are referred to as first conductive adhesives 121a to 121e, respectively. Similarly, the second conductive adhesives included in the sheet batteries 201 to 205 are referred to as second conductive adhesives 122a to 122e, respectively. In the XY plan view, the extraction electrodes 125a to 125e are arranged so as to overlap each other.

As shown in FIG. 10, the sheet battery 201 includes four first conductive adhesives 121a and four second conductive adhesives 122a. The four first conductive adhesives 121a and the four second conductive adhesives 122a are staggered. Similarly, the sheet-like battery 202 includes four first conductive adhesives 121b and four second conductive adhesives 122b. The four first conductive adhesives 121b and the four second conductive adhesives 122b are staggered.

The sheet-like battery 203 includes four first conductive adhesives 121c and four second conductive adhesives 122c. The four first conductive adhesives 121c and the four second conductive adhesives 122c are staggered. The sheet battery 204 includes four first conductive adhesives 121d and four second conductive adhesives 122d. The four first conductive adhesives 121d and the four second conductive adhesives 122d are staggered. The sheet battery 205 includes four first conductive adhesives 121e and four second conductive adhesives 122e. The four first conductive adhesives 121e and the four second conductive adhesives 122e are staggered.

FIG. 11 is a diagram showing all of the first conductive adhesives 121a to 121e and the second conductive adhesives 122a to 122e in the XY plan view. As shown in FIG. 11, the first conductive adhesives 121a to 121e and the second conductive adhesives 122a to 122e are formed in two rows. Then, 20 conductive adhesives are arranged in each row.

In the XY plan view, the first conductive adhesives 121a to 121e and the second conductive adhesives 122a to 122e are displaced from each other. That is, in the XY plan view, all 40 conductive adhesives are arranged so as to be shifted. For example, the first conductive adhesive 121a is disposed so as not to overlap any of the first conductive adhesives 121b to 121e and the second conductive adhesives 122a to 122e.

That is, in the XY plan view, any one of the first conductive adhesives 121a to 121e and the second conductive adhesives 122a to 122e is displaced from the conductive adhesives of the other sheet-like battery pairs. Has been. Thus, by arranging the first conductive adhesives 121a to 121e and the second conductive adhesives 122a to 122e so as not to overlap, an increase in the thickness of the multilayer battery 200 can be prevented.

A manufacturing method for manufacturing the laminated battery 200 shown in FIGS. 9 and 10 will be described. First, a plurality of secondary batteries 110 are prepared by the manufacturing method shown in FIG. As described above, the secondary battery 110 is a sheet battery pair. Then, a plurality of sheet-like battery pairs are stacked. At this time, in the adjacent sheet-shaped battery pairs, the sheet-shaped battery pairs are laminated so that the first electrodes (base materials) face each other. And between adjacent sheet-like battery pairs, while connecting 1st electrodes, the extraction electrodes 125 are connected. The first electrode can be connected at the tab portion. Thereby, a thin and high performance laminated battery can be manufactured.

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.

This application claims priority based on Japanese Patent Application No. 2018-104848 filed on May 31, 2018, the entire disclosure of which is incorporated herein.

DESCRIPTION OF SYMBOLS 10 Sheet-shaped battery 11 Base material 13 N-type oxide semiconductor layer 14 Charging layer 16 p-type oxide semiconductor layer 17 2nd electrode 20 Laminated body 31 Laminated | stacking part 32 Peripheral part 111 1st sheet-like battery 112 2nd sheet-like battery 121 First conductive adhesive 122 Second conductive adhesive 125 Extraction electrode 128 Insulating material 200 Stacked battery 201-205 Sheet battery pair 211a-211e First sheet battery 212a-212e Second sheet battery

Claims

A first sheet-like battery having a first electrode and a second electrode;
A second sheet-like battery having a first electrode and a second electrode, the second sheet-like battery being disposed facing the first sheet-like battery so that the second electrodes face each other;
An extraction electrode disposed between the second electrode of the first sheet battery and the second electrode of the second sheet battery;
A first conductive adhesive connecting the second electrode and the extraction electrode of the first sheet battery;
A second conductive adhesive connecting the second electrode and the extraction electrode of the second sheet battery,
In the plan view of the state in which the first sheet battery and the second sheet battery are arranged to face each other, the second conductive adhesive and the secondary conductive adhesive are arranged to be shifted from each other. battery.
A plurality of first conductive adhesives are disposed between the extraction electrode and the second electrode of the first sheet battery,
A plurality of second conductive adhesives are disposed between the extraction electrode and the second electrode of the first sheet battery,
The first conductive adhesive and the second conductive adhesive are alternately arranged in a plan view in a state where the first sheet battery and the second sheet battery are arranged to face each other. 2. The secondary battery according to 1.
The secondary battery according to claim 2, wherein the first conductive adhesive and the second conductive adhesive are alternately arranged along a longitudinal direction of the extraction electrode.
The first sheet-shaped battery and the second sheet-shaped battery have a tab portion,
In a plan view of the state in which the first sheet-shaped battery and the second sheet-shaped battery are arranged to face each other,
The tab portion of the first sheet battery and the tab portion of the second sheet battery overlap,
The secondary battery according to any one of claims 1 to 3, wherein the tab portion of the first sheet battery and the second sheet battery are arranged so that the first electrodes face each other at the tab portion.
The secondary battery according to any one of claims 1 to 4 as a sheet-like battery pair, comprising a plurality of the sheet-like battery pairs,
A plurality of the sheet battery pairs are stacked such that the first electrodes of two adjacent sheet battery pairs adjacent to each other face each other.
The first conductive adhesive and the second conductive provided in the plurality of sheet-like battery pairs when viewed from above in a state in which the first sheet-like battery and the second sheet-like battery are arranged facing each other. Secondary battery in which the adhesive is displaced.
Applying a first conductive adhesive on the second electrode of the first sheet-shaped battery having the first electrode and the second electrode;
Connecting an extraction electrode to the first conductive adhesive;
Applying a second conductive adhesive on the extraction electrode;
Connecting the second electrode of the second sheet-like battery having the first electrode and the second electrode to the second conductive adhesive,
In the plan view of the state in which the first sheet battery and the second sheet battery are arranged to face each other, the second conductive adhesive and the secondary conductive adhesive are arranged to be shifted from each other. Battery manufacturing method.
A plurality of first conductive adhesives are disposed between the extraction electrode and the second electrode of the first sheet battery,
A plurality of second conductive adhesives are disposed between the extraction electrode and the second electrode of the first sheet battery,
The first conductive adhesive and the second conductive adhesive are alternately arranged in a plan view in a state where the first sheet battery and the second sheet battery are arranged to face each other. 6. A method for producing a secondary battery according to 6.
The method for manufacturing a secondary battery according to claim 7, wherein the first conductive adhesive and the second conductive adhesive are alternately arranged along a longitudinal direction of the extraction electrode.
The first sheet-shaped battery and the second sheet-shaped battery have a tab portion,
In a plan view of the state in which the first sheet-shaped battery and the second sheet-shaped battery are arranged to face each other,
The tab portion of the first sheet battery and the tab portion of the second sheet battery overlap,
The secondary battery according to any one of claims 6 to 8, wherein the tab portion of the first sheet battery and the second sheet battery are arranged so that the first electrodes face each other at the tab portion. Production method.
A step of producing a plurality of the secondary batteries to be a sheet-like battery pair by the method for producing a secondary battery according to any one of claims 6 to 9,
Laminating a plurality of the sheet-like battery pairs so that the first electrodes of two adjacent sheet-like battery pairs face each other,
The first conductive adhesive and the second conductive provided in the plurality of sheet-like battery pairs when viewed from above in a state in which the first sheet-like battery and the second sheet-like battery are arranged facing each other. For producing a laminated battery in which the adhesive is displaced.