JP2017228415A - Sheet-like secondary battery and method for manufacturing sheet-like secondary battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily form a plurality of batteries of any shape while avoiding a short circuit due to metal sagging, from a sheet-like battery including a charged layer sandwiched between a positive electrode layer and a negative electrode layer.SOLUTION: A sheet-like battery according to the present invention is a sheet-like secondary battery including a charged layer between a positive electrode layer and a negative electrode layer. The sheet-like secondary battery includes: a plurality of grooves formed by removing one or both of the positive electrode layer layered on one surface of the charged layer and the negative electrode layer layered on the other surface in a film thickness direction; and a plurality of small batteries divided by the grooves.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a sheet-like secondary battery and a method for producing a sheet-like secondary battery.

  There is a battery whose basic configuration is a thin plate (sheet shape). In order to form such a sheet-shaped unit cell (hereinafter also simply referred to as a sheet-shaped battery), when forming the counter electrode, the electrode is divided using a mask having a predetermined shape, and the sheet-shaped unit cell is formed. The battery is cut to form a plurality of batteries of a predetermined size.

  The technology described in Patent Document 1 relates to a method for manufacturing an organic thin film solar cell. The technique described in Patent Document 1 describes that a plurality of unit cells are manufactured by forming a lower electrode using a mask. In the technique described in Patent Document 1, before forming an organic layer of an organic thin film solar cell, a lower electrode constituting a cell is completely electrically insulated from a lower electrode of an adjacent cell.

  By the way, in recent years, research and development of an all-solid-state secondary battery configured by forming a solid thin film has progressed, and a secondary battery that realizes downsizing is expected. One such secondary battery is described in Patent Document 2.

  Patent Document 2 discloses a secondary battery based on the principle of operation that captures electrons by forming a new energy level in a band gap by utilizing a photoexcitation structure change of a metal oxide semiconductor. This battery includes a charging layer filled with a fine particle n-type metal oxide semiconductor covered with an insulating film between a first electrode and a second electrode. In the charge layer, a new energy level is formed in the band gap of the n-type metal oxide semiconductor due to a photoexcitation structure change phenomenon caused by ultraviolet irradiation, and the energy is charged by capturing electrons in the energy level. . Here, in this specification, an all-solid-state secondary battery using such a photoexcited structural change of a metal oxide is referred to as a “quantum battery”.

JP 2006-237165 A International Publication No. 2013/065093

  However, in the conventional technology as described above, a standard-shaped battery is cut out by dividing the electrode by using a mask having a fixed shape, and thus cannot be processed into a battery having an arbitrary shape. For example, a chemical battery such as a lithium ion secondary battery has a standardized size, and thus can form a battery with a standardized shape, but cannot form a small-sized battery and between opposing electrodes. Since the battery is manufactured by injecting an electrolyte into the battery, the battery shape cannot be changed after the battery is manufactured.

  In addition, the conventional technique has a problem that the manufacturing cost is increased because the electrode is formed using a mask.

  Furthermore, as in the prior art, when the electrode separated by using a mask is cut after the electrode is formed, the charging layer disposed between the opposing electrodes is thin, so the stress due to the cut acts and the electrode deforms. In particular, there is a possibility that the electrode contacts the other electrode and short-circuits particularly at the end face.

  The present invention can easily form a plurality of small batteries of an arbitrary shape from a sheet-like secondary battery, and can form a plurality of small batteries from a sheet-like secondary battery while avoiding a short circuit. It aims at providing the manufacturing method of a battery and a sheet-like secondary battery.

  In order to solve this problem, a sheet-like battery according to the first aspect of the present invention is a sheet-like secondary battery having a charging layer between a positive electrode layer and a negative electrode layer. (1) A layer is formed on one surface of the charging layer. A plurality of grooves formed by removing one or both of the formed positive electrode layer and the negative electrode layer formed on the other surface in the film thickness direction, and (2) a plurality divided by the plurality of grooves. And a small battery.

  The method for producing a sheet-like secondary battery according to the second aspect of the present invention is the method for producing a sheet-like secondary battery having a charge layer between the positive electrode layer and the negative electrode layer. (1) The positive electrode on one surface of the charge layer Forming a layer, forming a negative electrode layer on the other surface of the charge layer, and (2) removing one or both of the positive electrode layer and the negative electrode layer formed on the charge layer in the film thickness direction, A groove portion forming step for forming a plurality of groove portions.

  According to the present invention, a plurality of small batteries having an arbitrary shape can be easily formed from a sheet-like secondary battery, and a plurality of small batteries can be formed from a sheet-like secondary battery while avoiding a short circuit.

It is a figure which shows the battery shape after cutting the positive electrode layer of the sheet-like battery which concerns on 1st Embodiment, and processing it into arbitrary shapes (the 1). It is a front view of the sheet battery concerning a 1st embodiment. It is the sectional view on the AA line of the sheet-like battery of FIG. It is the figure which wound the sheet-like battery which concerns on 1st Embodiment in roll shape, and pulled out one part. It is explanatory drawing explaining the depth of cutting with respect to the positive electrode layer of the sheet-like battery which concerns on 1st Embodiment. It is sectional drawing which shows the cross section of the scribed positive electrode layer which concerns on 1st Embodiment. It is a figure which shows the battery shape which cut the positive electrode layer of the sheet-like battery which concerns on 1st Embodiment, and was processed into arbitrary shapes (the 2). It is a schematic diagram which shows an image when the folding direction is changed alternately in 1st Embodiment and the sheet-like battery 1 is folded. It is explanatory drawing explaining the bending part when bending the conventional sheet-like battery. It is explanatory drawing explaining the bending part when bent by the groove part of the sheet-like battery which concerns on 1st Embodiment. It is a figure which shows the battery shape after cutting the positive electrode layer of the sheet-like battery which concerns on 2nd Embodiment, and processing it into arbitrary shapes. It is sectional drawing which shows the cross section of the scribed positive electrode layer which concerns on 2nd Embodiment. It is explanatory drawing explaining the bending part when bent by the groove part of the sheet-like battery which concerns on 2nd Embodiment. It is explanatory drawing explaining the testing apparatus of the battery which concerns on 3rd Embodiment. It is explanatory drawing explaining the method of insulating the battery which a malfunction generate | occur | produced with the sheet-like battery concerning 3rd Embodiment. In 3rd Embodiment, it is explanatory drawing explaining the defective location which arose in the battery of the sheet-like battery. In 3rd Embodiment, it is explanatory drawing explaining the mask of the defective part which arose in the battery of the sheet-like battery. In 3rd Embodiment, it is explanatory drawing explaining the method of masking a defective location.

(A) 1st Embodiment Below, 1st Embodiment of the manufacturing method of the sheet-like secondary battery which concerns on this invention and a sheet-like secondary battery is described in detail, referring drawings.

  In this specification, the “sheet-like battery” refers to a parallel plate (sheet-like) having an electrode layer (positive electrode layer, negative electrode layer) and an interelectrode layer interposed between the positive electrode layer and the negative electrode layer. Battery. The positive electrode layer, the negative electrode layer, and the interelectrode layer may be formed by stacking a plurality of sheet batteries in the thickness direction of one sheet battery, or a plurality of sheet batteries in the spreading direction of the sheet battery. You may line up.

  In addition, the interelectrode layer interposed between the positive electrode layer and the negative electrode layer is a portion that prevents contact between the positive electrode layer and the negative electrode layer and contributes to the generation of electromotive force and power storage. Layer (hereinafter, this charge / discharge layer is referred to as a “charge layer”) or the like, and is particularly suitable for a charge layer of a secondary battery, and more preferably applicable to a charge layer of a quantum battery.

  The sheet-like battery can be widely applied to, for example, a primary battery and a secondary battery based on the principle of a chemical battery or a physical battery, and is particularly suitable for an all-solid-state secondary battery, more preferably a quantum battery. it can.

  In this specification, “sheet-like secondary battery” refers to a sheet-like battery to which a secondary battery is applied. In particular, the sheet-like secondary battery refers to a sheet-like secondary battery in which the interelectrode layer is an all-solid type or a sheet-like secondary battery using a quantum battery.

(A-1) About Quantum Battery In this embodiment, the case where the sheet-like secondary battery according to the present invention is a quantum battery is exemplified. Therefore, first, the basic configuration of the quantum battery will be described.

  A quantum cell is a secondary cell based on the principle of operation that captures electrons by forming a new energy level in a band gap by utilizing a photoexcitation structure change of a metal oxide.

  The quantum battery is an all-solid-state secondary battery, and the configuration that functions as a single secondary battery has a solid charge layer between the negative electrode layer and the positive electrode layer.

  The charge layer is a layer that stores electrons in the charge operation, releases the electrons stored in the discharge operation, and holds (stores) the electrons in a state where no charge / discharge is performed. Has been formed.

  In the charging layer, fine particles of n-type metal oxide semiconductor covered with an insulating film are attached to the negative electrode layer in a thin film shape, and the n-type metal oxide semiconductor undergoes photoexcitation structural change by ultraviolet irradiation and stores electrons. It is a layer that has changed so that it can.

  The positive electrode layer has a positive electrode main body layer and a p-type metal oxide semiconductor layer formed so as to be in contact with the charging layer. The p-type metal oxide semiconductor layer is provided to prevent injection of electrons from the positive electrode main body layer to the charging layer.

  The negative electrode layer and the positive electrode main body layer of the positive electrode layer may be formed as a conductive layer.

  A quantum battery having such a basic configuration can be arranged as a battery by attaching electrode terminals to the electrode layer as needed, or attaching an exterior member, a covering member, or the like around the electrode. The basic configuration of the quantum battery may be a single-layer battery, and the single-layer batteries may be stacked and connected in series or in parallel to be packaged. Furthermore, a quantum battery as a single-layer battery can be folded or folded in a bellows shape, and a plurality of single-layer batteries can be stacked and connected in series or in parallel to be packaged.

(A-2) Sheet-like Secondary Battery In the first embodiment, the sheet-like secondary battery (hereinafter simply referred to as the sheet-like battery 1) is a sheet-like quantum battery having the above basic configuration. Explain the case.

  FIG. 2 is a front view of the sheet battery 1 according to this embodiment. FIG. 3 is a cross-sectional view taken along line AA of the sheet battery 1 of FIG.

  As shown in FIGS. 2 and 3, the sheet battery 1 according to the first embodiment is a thin plate in which the negative electrode layer 3, the charging layer 6, and the positive electrode layer 2, which are the basic configuration of the quantum battery described above, are sequentially stacked. It is a long object.

  As shown in FIG. 3, the sheet-like battery 1 includes a positive electrode layer 2 formed on one surface of the charging layer 6 and a negative electrode layer formed on the other surface of the charging layer 6. The positive electrode layer 2 and the negative electrode layer 3 may be conductive layers, and for example, a metal plate, a metal film, a transparent conductive film, or the like can be used.

  As shown in FIG. 2, both side edges in the width direction of the sheet battery 1 are formed in parallel to each other. Although the width length of this sheet-like battery 1 is not specifically limited, For example, the width length can be about 10 mm-500 mm. The length of the sheet-like battery 1 in the longitudinal direction (that is, the direction perpendicular to the width direction on the same surface) is such that the sheet-like battery 1 is bent once and the positive electrode layers 2 (or the negative electrode layers 3) of the sheet-like battery 1 are The length is not particularly limited as long as the length can be overlaid, and can be, for example, about 10 mm to 100 m.

  In addition, as a folding method of the sheet-like battery 1, the folding direction of the sheet-like battery 1 may be alternately changed and folded two or more times (that is, folded in a bellows shape).

  The length of the positive electrode layer 2 and the negative electrode layer 3 in the film thickness direction (that is, the film thickness length) can be about 10 nm to 1 μm, and the film thickness of the charging layer 6 can be about 50 nm to 10 μm. The sheet-like battery 1 can be configured to have flexibility, and can be wound into a roll after production. For example, as shown in FIG. 4, the sheet-like battery 1 can be wound into a roll.

(A-3) Electrode Layer Cutting Method FIG. 1A is an explanatory diagram for explaining a cutting position of the sheet battery 1 wound in a roll shape in the first embodiment. FIG. 1B is a diagram showing a plurality of small batteries formed after cutting at the cutting position of FIG.

  Although FIG. 1 illustrates the case where the positive electrode layer 2 of the sheet battery 1 is cut, the negative electrode layer 3 of the sheet battery 1 may be cut.

  In this specification, “small battery” means that the positive electrode layer 2 is formed on one surface of the charging layer 6, the negative electrode layer 3 is formed on the other surface of the charging layer 6, and the sheet-like battery 1 is a secondary battery. In a state where the battery functions as a battery (that is, a charging operation and a discharging operation), the battery is divided into a plurality of parts by the groove portion 5 formed by cutting.

  Various methods can be widely applied as a method for cutting the electrode layers (the positive electrode layer 2 and the negative electrode layer 3) of the sheet battery 1.

  However, since the thickness of the charging layer 6 of the sheet battery 1 is thin, physical force acts during cutting, and the electrode layers (the positive electrode layer 2 and the negative electrode layer 3) move due to stress, and cutting. The positive electrode layer 2 and the negative electrode layer 3 come into contact with each other at the end face of the sheet-like battery 1 that has been subjected to, and a short circuit may occur. The occurrence of a short circuit due to contact between the positive electrode layer 2 and the negative electrode layer 3 will be abbreviated as “metal sag short” and will be described below.

  Therefore, the electrode layer cutting method includes, for example, a laser scribing method in which the positive electrode layer 2 and the negative electrode layer 3 of the sheet battery 1 are irradiated with laser light to remove the positive electrode layer 2 and the negative electrode layer 3, or a sheet-like method. It is desirable to apply an ultrasonic scribing method or the like in which the positive electrode layer 2 and the negative electrode layer 3 of the battery 1 are irradiated with ultrasonic waves to remove the positive electrode layer 2 and the negative electrode layer 3. In this embodiment, a case where a laser scribing method is applied as a method for cutting the electrode layers (the positive electrode layer 2 and the negative electrode layer 3) is illustrated.

  In FIG. 1A, a region 4 surrounded by a dotted line is a position where the positive electrode layer 2 of the sheet battery 1 is irradiated with laser light, and the positive electrode layer 2 is scribed in the film thickness direction of the sheet battery 1. It is an area.

  As shown in FIG. 1 (A), the positive electrode layer 2 is scribed by irradiating laser light in the film thickness direction of the sheet-like battery 1 toward the region 4 in the positive electrode layer 2, so that FIG. As shown, the positive electrode layer 2 is removed in the film thickness direction to form the groove 5. As a result, as shown in FIG. 1B, a plurality of small batteries 10 processed into a rectangular shape can be formed. That is, the small battery 10 is divided by the groove 5.

  When a laser scribing method is applied as the electrode layer cutting method, the width, wavelength, irradiation time, output value, etc. of the laser light applied to the electrode layer are determined according to the shape of the battery formed after processing and the thickness of the electrode layer to be cut. It can be arbitrarily set according to the above.

  For example, when the rectangular small battery 10 shown in FIGS. 1A and 1B is formed, the width of the region 4 is set to about 30 to 100 μm, and the positive electrode layer 2 is irradiated with laser light. Can be realized. Further, it is desirable to adjust the wavelength, irradiation time, and output value of the laser beam according to the thickness of the positive electrode layer 2 to be cut.

  FIG. 5 is an explanatory diagram for explaining the depth in the film thickness direction of cutting with respect to the positive electrode layer 2 of the sheet-like battery 1.

  FIG. 5A is a plan view of the sheet battery 1 in which the positive electrode layer 2 is scribed. 5B and 5C are front views of the sheet battery 1 after the positive electrode layer 2 is scribed, and are views showing the cross-sectional shape of the groove portion 5. FIG.

  In FIG. 5A, when scribing the positive electrode layer 2 of the sheet battery 1 in the film thickness direction, the wavelength, width, irradiation time, output value, and the like of the laser light can be adjusted as described above.

  At this time, as shown in FIG. 5B, in the sheet-like battery 1, only the positive electrode layer 2 is scribed to form the groove portion 5 having a depth corresponding to the thickness of the positive electrode layer 2. good. In other words, when the cross-sectional shape of the groove portion 5 is seen in the cross section in the longitudinal direction of the sheet-like battery 1 (see FIG. 5B), the length of the groove portion 5 in the film thickness direction is the positive electrode layer 2 (or the negative electrode layer 3). ) So that the bottom of the groove 5 reaches the charging layer 6.

  Thereby, only the positive electrode layer 2 is removed in the film thickness direction in the sheet-like battery 1, and a region where the positive electrode layer 2 does not exist is formed above the charging layer 6. Further, as will be described later, even if the sheet-like battery 1 is folded or folded in a bellows shape with the groove portion 5 as a reference, the groove portion 5 functions as a folded portion, and the positive electrode layer 2 and the negative electrode layer 3 are not Since the charge layer 6 exists, contact between the positive electrode layer 2 and the negative electrode layer 3 can be prevented, and occurrence of a short circuit can be avoided.

  Another example of the cross-sectional shape of the groove 5 in the sheet battery 1 will be described with reference to FIG.

  As shown in FIG. 5C, by adjusting the width, wavelength, irradiation time, output value, etc. of the laser light, in the sheet battery 1, not only the scribing of the positive electrode layer 2 but also the film thickness of the charging layer 6. All or part of the above may be scribed. In other words, in the cross-section in the longitudinal direction of the sheet battery 1, when the cross-sectional shape of the groove portion 5 is viewed (see FIG. 5C), the length of the groove portion 5 in the film thickness direction is the positive electrode layer 2 (or the negative electrode layer 3). ) And the charging layer 6 are added to each other, and the bottom of the groove 5 is in the vicinity of the other negative electrode layer 3 (or the positive electrode layer 2) in which the bottom of the groove portion 5 is formed opposite to the charging layer 6. Alternatively, the other negative electrode layer 3 (or positive electrode layer 2) is reached.

  In FIG. 5C, the length of the groove 5 in the film thickness direction is the sum of the thicknesses of the positive electrode layer 2 and the charging layer 6, and the bottom of the groove 5 reaches the negative electrode layer 3. Shows the case. Thereby, since the deeper groove part 5 can be formed in the film thickness direction of the sheet-like battery 1, the workability at the time of folding the sheet-like battery 1 or folding it into a bellows shape can be improved.

  Here, in 1st Embodiment, the case where the sheet-like battery 1 is a quantum battery based on the principle of an all-solid-type physical battery is illustrated. Unlike a chemical battery such as a lithium ion secondary battery, the quantum battery functions as a battery without requiring an electrolyte solution or the like. Therefore, if the negative electrode layer 3 and the positive electrode layer 2 are in contact with the charging layer 6, even if the charging layer 6 is removed by scribing, each small battery 10 that has been fragmented functions as a battery.

  Next, the modification of the cross-sectional shape of each groove part 5 formed in the sheet-like battery 1 is demonstrated using FIG.

  FIG. 6 is an explanatory view illustrating another modification of the cutting method in the film thickness direction for the positive electrode layer 2 of the sheet battery 1.

  As shown in FIG. 6, the positive electrode layer 2 and the charging layer may be scribed so that the width length of the groove portion 5 in the charging layer 6 with respect to the width length of the groove portion 5 in the positive electrode layer 2 is shortened. That is, you may scribe so that the cross-sectional shape of the groove part 5 may become steps like FIG.

  In other words, the shape of each groove part 5 in the cross section along the longitudinal direction of the sheet-like battery 1 is such that the length in the film thickness direction of each groove part 5 is the film thickness of the positive electrode layer 2 (or the negative electrode layer 3) and the charging layer 6. It is about the same length as the total length of each length. In addition, the width of the opening of each groove 5 in the positive electrode layer 2 (or the negative electrode layer 3) (the length in the longitudinal direction of the sheet-like battery 1) is greater than the width of the bottom of the groove 5 reaching the charging layer 6. Too long.

  As a specific cutting method, various methods can be applied. For example, first, the depth of the groove 5 is a depth corresponding to the film thickness of the positive electrode layer 2 by laser scribing. 2, the positive electrode layer 2 is irradiated with laser light so as to have a relatively long width in the longitudinal direction of the sheet battery 1. Thereafter, by adjusting the output value of the laser beam and the width of the laser beam, the charging layer 6 is irradiated with the laser beam while narrowing the width of the laser beam to the charging layer 6, and the groove 5 The bottom is made to reach the negative electrode layer 3. In other words, after the laser beam is irradiated to the positive electrode layer 2 with a relatively wide width and the thickness direction of the positive electrode layer 2 is removed for cutting, the width of the laser beam is set to be relatively small. The charging layer 6 under the positive electrode layer 2 is narrowed, and the charging layer 6 is irradiated with laser light to cut the thickness direction of the charging layer 6.

  As illustrated in FIG. 6, when the sheet-like battery 1 is folded or bellows-shaped by cutting the positive electrode layer 2 and the charging layer 6 so that the cross-sectional shape of the groove portion 5 is gradually increased. Even if the positive electrode layer 2 moves, the charge layer 6 disposed below the positive electrode layer 2 can support the positive electrode layer 2 as a stopper, so that the contact between the positive electrode layer 2 and the negative electrode layer 3 is further improved. This can be further prevented and a short circuit can be avoided.

  In addition, the length of each groove portion 5 in the film thickness direction is approximately the same as the total length of the film thickness lengths of the positive electrode layer 2 and the charging layer 6, and the opening portion of each groove portion 5 in the positive electrode layer 2. The cross-sectional shape of the groove 5 is not limited to the shape shown in FIG. 6 as long as the width of the groove 5 can be longer than the width of the bottom of the groove 5 reaching the charging layer 6.

  For example, in the laser scribing method, the width and output value of the laser beam can be adjusted. Therefore, as the cross-sectional shape of the groove 5 after scribing becomes deeper in the film thickness direction, the width of the groove 5 becomes V-shaped. A shape (inverted pyramid shape), a U-shape, or the like may be used.

  1A and 1B exemplify a case where the positive electrode layer 2 is cut in the sheet battery 1. However, in the sheet battery 1, the negative electrode layer 3 may be cut, or both the positive electrode layer 2 and the negative electrode layer 3 may be cut.

  For example, when either one of the positive electrode layer 2 or the negative electrode layer 3 of the sheet battery 1 is cut, the positive electrode layer 2 or the negative electrode layer 3 to be cut is irradiated with laser light, and the positive electrode layer 2 or the negative electrode layer 3 Each groove part 5 can be formed.

  Moreover, when cutting both the positive electrode layer 2 and the negative electrode layer 3 of the sheet-like battery 1, the following method can be applied.

  For example, both the positive electrode layer 2 and the negative electrode layer 3 are irradiated with laser light from a direction perpendicular to both sides of the sheet surface of the sheet-like battery 1 to scribe the positive electrode layer 2 and the negative electrode layer 3, thereby Each groove portion 5 (also referred to as a positive electrode layer groove portion) in the layer 2 and each groove portion 5 (also referred to as a negative electrode layer groove portion) in the negative electrode layer 3 are formed.

  Also, for example, the positive electrode layer 2 is scribed by irradiating the positive electrode layer 2 with laser light from a direction perpendicular to one surface (for example, the positive electrode layer 2) of the sheet surface of the sheet-like battery, and the positive electrode layer groove portion After forming the negative electrode layer groove, the negative electrode layer 3 is scribed by irradiating the negative electrode layer 3 with laser light from a direction perpendicular to the other surface (for example, the negative electrode layer 3). good.

  As described above, by forming the groove portions 5 in both the positive electrode layer 2 and the negative electrode layer 3 of the sheet-like battery 1, the folding direction of the sheet-like battery 1 is alternately changed and folded in a bellows shape as will be described later. Furthermore, it can fold on the basis of both each positive electrode layer groove part and each negative electrode layer groove part.

  Moreover, in FIG. 1 (A) and FIG. 1 (B), the case where a laser beam is irradiated and scribed across the width direction of the sheet-like battery 1 to form a plurality of small batteries with the groove 5 as a boundary. Illustrated.

  However, as illustrated in FIGS. 7A and 7B, the laser beam is irradiated in the width direction of the sheet battery 1 and the laser beam is irradiated in the longitudinal direction of the sheet battery 1. Alternatively, the positive electrode layer 2 may be scribed in the width direction and the longitudinal direction of the sheet battery 1 to form a plurality of small batteries separated by the groove portions 5.

  In the case of FIG. 7A, since the positive electrode layer 2 is scribed in the width direction and the longitudinal direction of the sheet-like battery 1, as shown in FIG. A longitudinal groove 5a is formed. Therefore, each of the plurality of small batteries 10 in FIG. 7B is further made smaller than the small battery 10 in FIG.

  In addition, the shape of the small battery 10 formed by scribing the electrode layer of the sheet battery 1 is not limited to a rectangular shape, but is a polygon such as a circle, an ellipse, a triangle, a pentagon, a star, and the like. As shown in FIG.

(A-4) Bending of the sheet-like battery 1 The sheet-like battery 1 can be folded or folded by alternately changing the folding direction, and is connected in series or in parallel by appropriately connecting to the electrode terminals. Thus, a battery having a laminated structure can be formed.

  FIG. 8 is a schematic diagram showing an image when the sheet battery 1 is folded while alternately changing the folding direction.

  As shown in FIG. 8, when the sheet-like battery 1 is folded by alternately changing the folding direction, the electrode layers (the positive electrode layer 2 and the negative electrode layer 3) located inside the folded portion are pressed.

  For example, as shown in FIG. 9, when the sheet-like battery 1 is folded without scribing the electrode layer, the electrode layer on the inner side of the folded portion is determined from the difference between the outer diameter and the inner diameter of the folded portion of the sheet-like battery 1. For example, the positive electrode layer 2 pushes the charging layer 6 outward, and the inner electrode layer may destroy the charging layer 6. Furthermore, along with the destruction of the charging layer 6, one of the inner electrode layers (for example, the positive electrode layer 2) comes into contact with the other outer electrode layer (for example, the negative electrode layer 3). There is a risk of causing a short circuit.

  On the other hand, the scribed electrode layer is removed as in the sheet-like battery 1 according to the first embodiment, and the portion is formed as the groove portion 5. 5 functions as each folding part. Here, the folding portion is a portion that serves as a reference for a position where the sheet battery 1 is folded when the sheet battery 1 is folded.

  Here, as shown in FIG. 8, when the folding direction of the sheet battery 1 is alternately changed and folded in a bellows shape, the positive electrode layer 2 of the sheet battery 1 is irradiated with laser light to form the positive electrode layer groove portion. At the same time, the negative electrode layer 3 of the sheet battery 1 is irradiated with laser light to form a negative electrode layer groove in the film thickness direction.

  Moreover, in order to be able to fold the sheet-like battery 1 in a bellows shape, each position of the positive electrode layer groove portion and the negative electrode layer groove portion is a position not facing the charging layer 6 (that is, a non-facing position). It is formed alternately. Thereby, when the sheet-like battery 1 is folded in a bellows shape, each positive electrode layer groove portion and each negative electrode layer groove portion can function as a folding portion that is a reference for a position to be folded.

  In this case, as shown in FIG. 10, the inner electrode layer (for example, the positive electrode layer 2) in each folded portion can prevent contact with the charging layer 6, so that the inner electrode layer can push the charging layer 6 outward. Disappear. Therefore, it is possible to avoid the inner electrode layer from destroying the charging layer 6, and further, avoiding a short circuit due to contact of the inner electrode layer (for example, the positive electrode layer 2) with the outer electrode layer (for example, the negative electrode layer). Can do.

  8 to 10 exemplify the case where the sheet-like battery 1 is folded by alternately changing the folding direction, the present invention is similarly effective when the sheet-like battery 1 is folded.

(A-5) Effects of the First Embodiment As described above, according to the first embodiment, after forming the electrode layer, the electrode layer of the sheet battery is striped to obtain an arbitrary shape. A plurality of batteries can be divided.

  In addition, according to the first embodiment, by striking the electrode layer of the sheet battery, contact with the other electrode layer can be prevented by metal sagging of the electrode layer at the end face, and metal sagging short-circuit can be avoided. Can do.

  Further, according to the first embodiment, when the sheet-like battery is folded or folded, the electrode layer of the sheet-like battery is striped to form a groove portion. It is possible to avoid a short circuit in the portion of the charging layer that has been destroyed.

(B) 2nd Embodiment Next, 2nd Embodiment of the manufacturing method of the sheet-like secondary battery and sheet-like secondary battery which concerns on this invention is described in detail, referring drawings.

(B-1) Configuration of Second Embodiment Also in the second embodiment, in order to illustrate the case where the sheet battery 1 is a quantum battery, FIGS. 2 to 4 according to the first embodiment are used. The sheet-like battery according to the second embodiment will be described in detail.

  The second embodiment is different from the first embodiment in the method of cutting the electrode layers (positive electrode layer 2 and negative electrode layer 3) of the sheet-like battery 1, and the shape of each groove 5 formed by scribing the electrode layer is the first. Different from the first embodiment.

  Therefore, in the second embodiment, a method for cutting the electrode layer of the sheet battery 1 will be described in detail.

  FIG. 11A is an explanatory diagram for explaining a cutting position of the sheet-like battery 1 wound in a roll shape in the second embodiment. FIG. 11B is a diagram showing a plurality of small batteries formed after cutting at the cutting position of FIG.

  In FIG. 11A, a shaded area 4 surrounded by a dotted line is an area where the positive electrode layer 2 is scribed by irradiating a laser beam, and the area 4 includes two rows having a predetermined width and a predetermined interval. As an area.

  Therefore, the convex part 7 of the positive electrode layer 2 which is not scribed is provided in the center part of the groove part 5 which divides a certain small battery 10 and the small battery 10 adjacent to this. Since each convex portion 7 remains in an island shape in the central portion of each groove portion 5, it is also called an island portion. As a result, as shown in FIG. 11B, the groove 5 and the convex portion 7 are formed between the plurality of small batteries 10 processed into a rectangular shape and the small battery 10 adjacent to a certain small battery 10. .

  In addition, when scribing the electrode layer, it is also possible to use the island-shaped convex portion 7 as a mark (a mark) for recognizing that the small battery 10 is to be processed. Therefore, from the functional viewpoint of the convex part 7, the convex part 7 is also called a process recognition part.

  11A and 11B exemplify the case where the convex portion 7 of the positive electrode layer 2 is a quadrangular prism across the width direction of the sheet battery 1, the convex portion 7 is a sheet. A plurality of quadrangular prisms may be interspersed in the width direction of the sheet battery 1 and in the width direction of the sheet battery 1.

  Further, in FIG. 11A and FIG. 11B, the case where one row of convex portions 7 is formed in the width direction of the sheet battery 1 is illustrated. You may form as multiple rows, such as 2 rows and 3 rows, in the width direction.

  As with the first embodiment, various methods can be widely applied to the cutting method according to the second embodiment. For example, a laser scribe method, an ultrasonic scribe method, or the like can be applied. Also in this embodiment, the case where a laser scribing method is applied is illustrated.

  12A and 12B are views showing the cross-sectional shape of each groove 5 after scribing of the positive electrode layer 2.

  12A and 12B, the width of each of the two groove portions 5 in the positive electrode layer 2 can be, for example, about 30 nm to 50 nm. Moreover, the width length of the convex part 7 in the positive electrode layer 2 can be about 50 nm-100 nm, for example. For example, the first groove portion 5 is formed in the positive electrode layer 2 by irradiating the positive electrode layer 2 with laser light having a width of about 30 nm to 50 nm. Then, the positive groove 2 is irradiated with laser light having a width of about 30 nm to 50 nm at an interval of about 50 nm to 100 nm with respect to the first groove 5, and the second groove 5 in the positive electrode layer 2. Form. In this manner, in the positive electrode layer 2, a groove having the convex portion 7 can be formed at the center portion of the groove portion 5.

  Note that the width of the scribing of the positive electrode layer 2 and the width of the convex portion 7 of the positive electrode layer 2 can be realized by adjusting the wavelength, width, irradiation time, output value, etc. of the laser light. It can be arbitrarily set according to the processing accuracy such as the shape of the battery 10.

  Also, the cutting depth of the sheet-like battery 1 with respect to the positive electrode layer 2 may be a depth corresponding to the film thickness of the positive electrode layer 2 as shown in FIG. 12A, as in the first embodiment. good. In this case, the height of the convex portion 7 of the positive electrode layer 2 is a height corresponding to the film thickness of the positive electrode layer 2.

  Further, for example, as shown in FIG. 12 (B), in order to form a deeper groove portion 5, all or a part of the charging layer 6 may be scribed. In this case, the depth of each groove part 5 can be made to be approximately the same as the film thickness length obtained by adding the film thickness lengths of the positive electrode layer 2 and the charge layer 6. In this case, the height of the convex portion 7 of the positive electrode layer 2 is a height obtained by adding the film thickness of the positive electrode layer 2 and the film thickness of the charging layer 6. In addition, the cross section of the groove part 5 is good also as a step shape similarly to 1st Embodiment, and is good also as V shape, U shape, etc. FIG.

  Further, the cutting of the electrode layer of the sheet battery 1 is not limited to the positive electrode layer 2 of the sheet battery 1, and the negative electrode layer 3 may be striped, or both sides of the sheet battery 1 may be cut. The deposited electrode layer may be striped.

  FIG. 13 is a schematic diagram showing an image when the sheet battery 1 is folded by alternately changing the folding direction according to the second embodiment.

  When the sheet battery 1 of the second embodiment of FIG. 11 is folded by alternately changing the folding direction, the folded portion of the sheet battery 1 can be folded with the convex portion 7 as a reference point. That is, the convex part 7 is located inside the folding part of the sheet-like battery 1 and is bent.

  Since the groove portions 5 are formed on both sides of the convex portion 7, the inner electrode layer (for example, the positive electrode layer 2) in the folded portion can be prevented from contacting the charging layer 6, so that the inner electrode layer is the charging layer 6. Will not be pushed outward. Therefore, it is possible to avoid the inner electrode layer from destroying the charging layer 6, and furthermore, the inner electrode layer (for example, the positive electrode layer 2) can avoid a short circuit due to contact with the outer electrode layer (for example, the negative electrode layer). Can do.

(B-2) Effects of the Second Embodiment As described above, according to the second embodiment, the electrode of the sheet battery is formed after the electrode layer is formed in the same effect as the first embodiment. A plurality of batteries having an arbitrary shape can be divided by striping the layers.

  In addition, according to the second embodiment, by striking the electrode layer of the sheet-like battery, contact with the other electrode layer can be prevented by metal sag of the electrode layer at the end face, and metal sag short is avoided. Can do.

  Furthermore, according to the second embodiment, when the sheet-like battery is folded or folded, the electrode layer of the sheet-like battery is striped to form a groove portion. It is possible to avoid a short circuit in the portion of the charging layer that has been destroyed.

(C) Third Embodiment Next, a third embodiment of the sheet battery according to the present invention will be described in detail with reference to the drawings.

  In the battery manufacturing process, the performance of the battery is tested during or after the manufacturing process. Here, “battery test” includes battery performance evaluation, battery normality inspection, battery performance measurement and test, for example, battery performance inspection, charge / discharge test, conditioning, charge / discharge cycle test, This concept includes an aging test and the like.

  A battery test is performed during or after the battery manufacturing process. If there are defects or abnormalities in the sheet-like battery 1 that are not divided (divided) into a plurality of batteries as in the prior art, one defect is detected. Therefore, the entire test result of the sheet-like battery 1 was affected.

  Further, when the sheet-like battery has a defect or abnormality, a repair for repairing or deactivating the defect or abnormality is required.

  Therefore, in the third embodiment, the battery testing method and defects, abnormalities, etc., in the sheet-like battery 1 divided into the small batteries 10 by scribing the electrode layers described in the first and second embodiments. The repair method of a location is demonstrated.

  Here, the defective part in a sheet-like battery is a defective part of the electrical property which may arise in any or all of the positive electrode layer 2, the negative electrode layer 3, and the charge layer 6. FIG. For example, the defective part of the positive electrode layer 2 or the negative electrode layer 3 refers to a part where the electrical characteristics of the positive electrode layer 2 or the negative electrode layer 3 do not appear normally. Further, for example, the defective portion of the charging layer 6 includes a portion where the charging operation, the discharging operation, and the storage operation of the charging layer 6 do not operate normally, and the positive electrode layer 2 or the negative electrode layer 3 in which a defect occurs in the charging layer 6 The part that is.

(C-1) Battery Testing Method First, a battery testing method for the sheet battery 1 according to the first and second embodiments will be described.

  FIG. 14 is a configuration diagram illustrating a schematic configuration of a test of the sheet battery 1. In FIG. 14, performance inspection, charge / discharge test, conditioning, charge / discharge cycle test, aging test, and the like of the sheet battery 1 are performed.

  In FIG. 14, the sheet-shaped battery 1 is generally tested by including a battery testing machine 55, a pressing unit 51, and a pressing table 54.

  In FIG. 14, as described in the first and second embodiments, the sheet battery 1 scribes the electrode layers (the positive electrode layer 2 and the negative electrode layer 3), and the scribed portions correspond to the groove portions 5. It has become. The sheet-like battery 1 is divided into a plurality of small batteries 10 by the grooves 5.

  The battery testing machine 55 is provided with a negative terminal plate 521 and a positive terminal plate 522 for electrical connection between the folded portions of the sheet-like battery 1 folded in a bellows shape by alternately changing the folding direction and on the upper and lower surfaces. Then, supply power and measure electrical characteristics necessary for battery testing.

  The pressing portion 51 applies pressure by sandwiching the sheet-like battery 1 from both outer surfaces in a state where the positive terminal plate 522 and the negative terminal plate 521 are arranged on the folded portion and the upper and lower surfaces. When the pressing portion 51 applies pressure to the sheet battery 1, the positive electrode terminal plate 522 and the negative electrode terminal plate 521 sandwiched between the folded portions of the sheet battery 1 or arranged on the upper and lower surfaces, and the sheet battery 1. Contact with the positive electrode layer 2 and the negative electrode layer 3 can be ensured. In this embodiment, the pressing portion 51 places a pressing base 54 on which the folded sheet-like battery 1 is placed, a pressing plate 56 that presses the sheet-like battery 1 placed on the pressing base 54 downward from above, A pressing mechanism (not shown) that moves the pressing plate 56 in the pressing direction is provided.

  The pressing plate 56 is a plate-like body for applying pressure to the sheet-like battery 1 from the upper side to the lower side, for example. The pressing plate 56 has a flat pressing surface that can be pressed, and moves downward from above the sheet battery 1 toward the pressing table 54 while keeping the pressing surface horizontal by the pressing mechanism portion. The upper surface of the sheet battery 1 is pressed. Here, the pressing plate 56 has a pressing surface that presses the entire upper surface of the sheet battery 1 in order to improve the contact between the positive electrode terminal plate 522 and the negative electrode terminal plate 521 and the sheet battery 1. A pressing surface that presses a region where the conductive portions of the positive electrode terminal plate 522 and the negative electrode terminal plate 521 are in contact with the positive electrode layer 2 and the negative electrode layer 3 of the sheet-like battery 1 (that is, a partial region of the upper surface of the sheet-like battery 1). It may have.

  The pressing stand 54 mounts the sheet battery 1. The pressing table 54 is provided below the pressing direction of the pressing plate 56. The pressing table 54 has a flat mounting surface facing the pressing surface of the pressing plate 56, and supports the sheet battery 1 on the mounting surface pressed by the pressing plate 56 from the lower surface. The mounting surface supports the entire lower surface of the sheet battery 1, but at least a region where the conductive members of the positive terminal plate 522 and the negative terminal plate 521 are in contact with the electrode layer of the bellows-shaped sheet battery 1 ( That is, a part of the lower surface of the sheet battery 1 is supported. Thereby, the folded sheet-like battery 1 can be sandwiched between the pressing plate 56 and the pressing base 54 and applied with pressure.

  Note that the folded sheet battery 1 pressed by the pressing portion 51 may be placed directly on the mounting surface of the pressing table 54 or may be placed on the tray 101 as will be described later.

  Further, in this embodiment, the case where the pressing plate 56 is moved and pressed downward from the upper side with the pressing base 54 fixed is illustrated, but the present invention is not limited to this. That is, it suffices if pressure can be applied while sandwiching the folded sheet-like battery 1 from both sides. For example, the pressing plate 56 may be fixed and the pressing base 54 may be pushed upward from below and pressed. Further, the pressing base 54 and the pressing plate 56 may be movable, and the pressing base 54 may move from below to above, and the pressing plate 56 may move from above to below.

  In FIG. 14, the folded sheet battery 1 has a bellows shape, and the positive terminal plate 522 and the negative terminal plate 521 are inserted into the gap between the folded portions. That is, the positive electrode terminal plate 522 as a positive electrode terminal is inserted into the portion of the sheet battery 1 that is folded so that the positive electrode layer 2 is on the inner side. Further, a negative electrode terminal plate 521 as a negative electrode terminal is inserted into a portion where the negative electrode layer 3 of the sheet battery 1 is folded inward.

  The battery testing machine 106 connects the positive electrode terminal plate 522 and the negative electrode terminal plate 521 that are in contact with the sheet battery 1 as electrode terminals for electrical connection, and supplies power for testing (for example, applying a voltage). Or carry a current). The positive terminal plate 522 is connected to the positive terminal 55a of the battery testing machine 55 through an electric wire. The negative electrode terminal plate 521 is connected to the negative electrode side terminal 55b of the battery testing machine 55 via an electric wire.

  The battery testing machine 55 has a function of applying a voltage or passing a current between the positive electrode terminal plate 522 and the negative electrode terminal plate 521, and a current, voltage, etc. between the positive electrode terminal plate 522 and the negative electrode terminal plate 521. You may make it have the function to measure the electrical property.

  The battery testing machine 106 has a function of determining whether the measured electrical characteristics are within a pre-registered allowable range and determining whether the battery at the measurement location is normal or abnormal. You may do it.

  The abnormal part (test body) is determined by specifying the positive electrode terminal plate 522 and the negative electrode terminal plate 521 from which the measurement value determined to be abnormal is measured, or by specifying the positive electrode terminal plate 522.

  The battery testing machine 106 regarded the small battery 10 positioned between adjacent folding lines of the folded sheet battery or between the edge of the sheet battery 1 and the adjacent folding line as one test body. In some cases, a plurality of small batteries 10 can be tested simultaneously in parallel.

  Furthermore, since the battery testing machine 106 can test a plurality of small batteries 10 in parallel, if any one of the plurality of small batteries 10 being tested simultaneously has a problem. Therefore, it is possible to individually cut off the power supply from the small battery 10 in which the failure occurs to the specimen.

  More specifically, as illustrated in FIG. 15, among the plurality of small batteries 10, an insulator 60 is provided between the defective small batteries 10 instead of the positive terminal plate 522 or the negative terminal plate 521. Try to insert. Thereby, the small battery 10 which is the test body in which the defect has occurred can be insulated by the insulator 60, and the battery test of the other small battery 10 (the test body in which the defect has not occurred) can be continued. Therefore, the efficiency of the test can be improved.

  After the test is completed, the positive electrode terminal plate 522, the negative electrode terminal plate 521, and the insulator 60 are extracted from the sheet battery 1 and transferred to the next step or stored in a bellows shape.

  In addition, about the battery (for example, the test body pinched | interposed into the positive electrode terminal board 522 and the negative electrode terminal board 521 which detected abnormality) of the part by which abnormality was detected at the test process, the part is repaired at a subsequent process, or Can be removed.

(C-2) Repair Method FIG. 16 is a diagram showing a defective portion (a sentence is an abnormal portion) in the sheet-like battery 1 in which the positive electrode layer 2 is scribed and divided into a plurality of small batteries 10. In FIG. 16, it is assumed that there is a defective portion 70 in the second small battery 10 from the right. The method for detecting the defective portion 70 is a test step of the above-described battery testing method, for example, specifying a defective portion that is electrically short-circuited, or specifying a defective portion using visual inspection, a CCD camera, or the like. To do.

  In the battery testing process, as shown in FIG. 16, when a defective portion 70 is confirmed in the small battery 10, as shown in FIG. 17, the same scribing method as the electrode layer (positive electrode layer 2, negative electrode layer 3) is used. Using the scribing method, the defective part 70 can be scribed to repair or inactivate the defective part 70.

  More specifically, as shown in FIG. 18A, it is assumed that there is a defective portion 70 in the charging layer 6 between the positive electrode layer 2 and the negative electrode layer 3. At this time, the electrode layer (positive electrode layer 2 or negative electrode layer 3) at the position of the defective portion 70 is scribed, and the positive electrode layer 2 or negative electrode layer 3 is partially removed. In this way, as shown in FIG. 18B, the positive electrode layer 2 or the negative electrode layer 3 that has been in contact with the defective portion 70 is removed, so that adverse effects on the battery performance and the like of the defective portion 70 are avoided. can do.

  Further, as shown in FIG. 18C, after the positive electrode layer 2 or the negative electrode layer 3 is scribed and removed in FIG. 18B, the removed portion is made of the same material as the positive electrode layer 2 or the negative electrode layer 3. The mask 80 is covered with the electrode, so that the scribe portion can be covered with the mask 80. Thereby, the sheet-like battery 1 in which the defective part 70 is found can be repaired.

DESCRIPTION OF SYMBOLS 1 ... Sheet-like battery, 2 ... Negative electrode layer, 3 ... Positive electrode layer, 6 ... Charging layer, 4 ... Scribe area | region, 5 ... Groove part, 10 ... Battery, 7 ... Convex part.

Claims (18)

In a sheet-like secondary battery having a charge layer between the positive electrode layer and the negative electrode layer,
A plurality of grooves formed by removing one or both of the positive electrode layer formed on one surface of the charging layer and the negative electrode layer formed on the other surface in the film thickness direction, and ,
A sheet-like secondary battery comprising: a plurality of small batteries divided by the plurality of grooves.   The length of each groove part in the film thickness direction is longer than the film thickness of the positive electrode layer or the negative electrode layer, and the bottom part of each groove part reaches the charging layer. Sheet-like secondary battery.   3. The sheet shape according to claim 2, wherein the width of the opening of each groove in the positive electrode layer or the negative electrode layer is longer than the width of the bottom of each groove reaching the charging layer. Secondary battery.   The sheet-like secondary battery according to claim 1, wherein each of the groove portions serves as a folding portion when the sheet-like secondary battery is folded. The positive electrode layer groove portion as the positive electrode layer groove portion and the negative electrode layer groove portion as the negative electrode layer groove portion are alternately formed at the non-opposing positions with respect to the charging layer in the longitudinal direction of the sheet-like battery. ,
The sheet-like secondary battery according to claim 1, wherein the positive electrode layer groove portion and the negative electrode layer groove portion serve as a folding portion when the sheet-like battery is folded.   2. The sheet-like secondary battery according to claim 1, further comprising a convex portion formed on each bottom surface of the plurality of groove portions, wherein the convex portion serves as a folding portion when the sheet-like battery is folded. .   2. The small battery having a defective portion among the plurality of small batteries has a removal region in which a region of the positive electrode layer or the negative electrode layer corresponding to the defective portion is removed. Sheet-like secondary battery. Among the plurality of small batteries, in the small battery having a defective portion, a removal region in which the region of the positive electrode layer or the negative electrode layer corresponding to the defective portion is removed,
A mask portion for masking the removal region;
The sheet-like secondary battery according to claim 1, comprising:   The sheet-like sheet according to claim 1, further comprising an insulating portion that insulates the small battery including the defective portion from the plurality of small batteries so that the small battery including the defective portion is not subjected to the test. Secondary battery. In the method for producing a sheet-like secondary battery having a charging layer between the positive electrode layer and the negative electrode layer,
Stratifying the positive electrode layer on one surface of the charging layer and stratifying the negative electrode layer on the other surface of the charging layer;
A groove forming step for forming a plurality of grooves by removing one or both of the positive electrode layer and the negative electrode layer formed on the charging layer in the film thickness direction. A method for manufacturing a secondary battery. The groove forming step includes
The groove portions are formed by removing the positive electrode layer or the negative electrode layer so that the thickness of the positive electrode layer or the negative electrode layer is longer than the thickness of the positive electrode layer or the negative electrode layer and the bottom of each groove portion reaches the charging layer. The method for producing a sheet-like secondary battery according to claim 10. The groove forming step includes
The width of the opening of each groove in the positive electrode layer or the negative electrode layer is made longer than the width of the bottom of each groove reaching the charging layer to form each groove. The manufacturing method of the sheet-like secondary battery of Claim 11.   The method for manufacturing a sheet-like secondary battery according to claim 10, further comprising a folding step of folding the sheet-like secondary battery, with each of the groove portions formed in the groove portion forming step being a folding portion. The groove forming step includes
Removing the positive electrode layer in the film thickness direction of the positive electrode layer to form a plurality of positive electrode layer grooves;
The negative electrode layer is arranged in a film thickness direction of the negative electrode layer at a position that is non-opposing to each position of the plurality of grooves with respect to the charging layer as a reference over the longitudinal direction of the sheet-like secondary battery. Removing and forming a plurality of negative electrode layer grooves, and
A step of folding the sheet-like secondary battery alternately so that the positive electrode layer groove and the negative electrode layer groove are folded portions, respectively, so that the positive electrode layer and the negative electrode layer are alternately inside. The method for producing a sheet-like secondary battery according to claim 10. The groove part forming step removes one or both of the positive electrode layer and the negative electrode layer in the film thickness direction so that a convex part is formed in the central part of each groove part,
The method for manufacturing a sheet-shaped secondary battery according to claim 10, further comprising a folding step of folding the sheet-shaped secondary battery with the convex portions formed in the plurality of groove portions as folding portions.   A removal region specifying step of specifying a region of the positive electrode layer or the negative electrode layer corresponding to the defective portion in the small battery having a defective portion among the plurality of small cells divided by the plurality of groove portions, The manufacturing method of the sheet-like secondary battery of Claim 10.   The method for manufacturing a sheet-like secondary battery according to claim 16, further comprising a mask step for masking the removal region specified by the removal region specification step. Folding the sheet-shaped secondary battery alternately, sandwiching the electrode terminal in the folded portion, and testing the sheet-shaped secondary battery,
The insulating step of insulating the battery including the defective portion so that the small battery including the defective portion is not subjected to the test among the plurality of small batteries divided by the plurality of groove portions. A method for producing the sheet-like secondary battery according to 10.

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