JP2019003842A - Film sheathing battery and manufacturing method therefor - Google Patents

Abstract

To restrain movement of an electrode laminate 3 in a sheathing body 2, in a film sheathing battery.SOLUTION: An electrode laminate 3 including an electrode tab 4 is housed in a sheathing body 2 consisting of two laminate films in sealing process. The sheathing body 2 becomes bag-like by heating and sealing three sides 7, 8, 9 by means of a heat block. At the side 7 at an electrode tab 4 side, joint points 15A-15C where two laminate films are bonded locally by thermal fusion are formed at positions closer to a circumference of the electrode laminate 3 than an inner boundary of a seal line 11. With such an arrangement, movement of the electrode laminate 3 is restrained. Furthermore, joint points 15D, 15E may be added for restraining the movement of the electrode laminate 3 in a rotation direction with the electrode tab 4 as a fulcrum.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a film-clad battery in which an electrode laminate (power generation element) is accommodated together with an electrolyte in an exterior body made of a laminate film having flexibility, and more particularly to an electrode in the exterior body. The present invention relates to an improvement in a configuration that suppresses the movement of a laminate.

  For example, as a lithium ion secondary battery, an electrode laminate (also referred to as a power generation element) in which a plurality of sheet-like positive and negative electrodes are laminated via a separator is an exterior body made of a laminate film having a heat-sealing layer. 2. Description of the Related Art A film-clad battery having a flat shape housed together with an electrolyte is known. Sealing of each side of the outer package in a film-clad battery is generally performed by sandwiching and heating two laminated films between a pair of heat blocks so that each heat-sealing layer is inside, A heat sealing method is employed in which the heat-sealing layers are bonded to each other. One side of the electrode laminate is provided with positive and negative electrode tabs in which the ends of the current collectors of the positive electrode and the negative electrode are bundled and connected by ultrasonic bonding or the like. It is led out through the joint surface of the film.

  On the other hand, in Patent Document 1, in this type of film-clad battery, in order to prevent displacement of the electrode laminate in the outer package, a tongue piece part that partially protrudes on one side of the separator is provided, and a laminate film is used. It is disclosed that a tongue portion of a separator is sandwiched between two laminate films, and is integrally bonded by ultrasonic bonding or the like when sealing an exterior body.

JP 2013-73913 A

  In the film-clad battery as described above, there is a slight gap between the seal line on each side of the outer package that is heat-sealed and the peripheral edge of the electrode laminate, especially on one side of the electrode tab side. Since the ends of a large number of current collectors (metal foils) reaching the electrode tab are accommodated, there is a relatively large distance. Therefore, there is a concern that when an impact is applied to the film-clad battery from the outside, the electrode laminate moves inside the exterior body, and as a result, the current collector is bent and the battery performance is lowered. is there.

  In the configuration in which the separator is provided with a tongue piece as in Patent Document 1 and sandwiched between the exterior bodies, the movement of the electrode laminate due to impact or the like is suppressed, but the area of the tongue piece does not contribute to the battery capacity. Therefore, it is not preferable from the viewpoint of the battery capacity with respect to the outer dimensions of the battery.

  The film-clad battery according to the present invention is a position closer to the periphery of the electrode laminate than the inner boundary of the seal line continuously set across the electrode tab on one side of the electrode tab of the exterior body made of a laminate film Further, at least one joining point where the laminated films are locally joined is provided. By this joining point, the movement of the electrode laminate within the exterior body is suppressed.

  Moreover, the manufacturing method of the film-clad battery according to the present invention includes an electrode laminating step that constitutes an electrode laminate having positive and negative electrode tabs on one side, and each side of the outer periphery of the outer package made of a laminate film. In the sealing step of heat sealing along the set seal line, and at least one side of the exterior body on the electrode tab side, at a position closer to the periphery of the electrode laminate than the inner boundary of the seal line of the side And a bonding point forming step of locally bonding the laminated films to form one or a plurality of bonding points, and a liquid injection step of injecting an electrolytic solution into the outer package.

  According to this invention, the movement of the electrode laminated body inside the exterior body is suppressed by providing the junction point at a position closer to the periphery of the electrode laminated body than the inner boundary of the seal line. The formation of this junction does not cause an increase in the outer dimension of the outer package or a decrease in battery capacity.

Process explanatory drawing which showed the principal part of the battery manufacturing method of one Example. The front view of the cell which passed through the sealing process. The front view of the cell which passed through the joining point formation process. Sectional drawing which contrasted and showed the cross section (a) along the AA line of FIG. 3, and the cross section (b) along the BB line. Explanatory drawing explaining the position setting of the junction point by the detection of an electrode tab. Explanatory drawing explaining the detection of the peripheral position of the electrode laminated body using a contactor. Explanatory drawing explaining the detection of the peripheral position of the electrode laminated body using X-ray | X_line.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a process explanatory view showing the main part of the battery manufacturing method of one embodiment. In this embodiment, as an example of a film-clad battery, a film-clad lithium ion secondary battery having a flat shape constituting a power supply pack for driving a vehicle such as an electric vehicle or a hybrid vehicle is targeted. A film-clad battery according to an embodiment includes an electrode laminate (power generation element) formed by laminating a plurality of positive electrodes and negative electrodes configured in a rectangular sheet shape via a separator, and the electrode laminate is a bag made of a laminate film. In an outer package body together with an electrolytic solution. In the description of the following examples, the battery after the electrode laminate is accommodated in the film-like outer package is simply referred to as “cell” regardless of the manufacturing process.

  The process shown as step S1 is an electrode lamination process which comprises an electrode laminated body. Here, a positive electrode, a negative electrode, and a separator wound in a roll shape are sequentially stacked while being cut into a rectangular sheet, so that a power generation element, that is, an electrode, in which a plurality of positive electrodes and negative electrodes are stacked via a separator. A laminate is formed. The positive electrode is obtained by applying a positive electrode active material as a slurry containing a binder to both surfaces of an aluminum foil serving as a current collector, and drying and rolling to form an active material layer having a predetermined thickness. Similarly, the negative electrode is obtained by applying a negative electrode active material as a slurry containing a binder to both surfaces of a copper foil serving as a current collector, and drying and rolling to form an active material layer having a predetermined thickness.

  The separator has a function of preventing the short circuit between the positive electrode and the negative electrode and at the same time holding the electrolytic solution. For example, the separator is a microporous film of a thermoplastic synthetic resin such as polyethylene (PE) or polypropylene (PP). Alternatively, a porous ceramic layer serving as a heat-resistant layer is formed by spraying ceramic particles on the surface of a synthetic resin layer made of nonwoven fabric. For example, a ceramic layer is provided on both surfaces of a synthetic resin layer made of polypropylene.

  The positive electrode, the negative electrode, and the separator are laminated in a predetermined number to form a power generation element, that is, an electrode laminate. The ends of the current collectors of the plurality of positive electrodes are overlapped with each other, and an electrode tab that is a positive terminal, that is, a positive electrode tab is ultrasonically welded. Similarly, the ends of the current collectors of the plurality of negative electrodes are overlapped with each other, and an electrode tab that is a negative terminal, that is, a negative electrode tab, is ultrasonically welded. The positive electrode tab is made of a strip-like thin aluminum plate, and the negative electrode tab is made of a strip-like thin copper plate. That is, each is comprised from the same kind of metal as an electrical power collector. In addition, the edge part of the collector (aluminum foil and copper foil) joined to these positive / negative electrode tabs is comparatively short with the width | variety corresponding to an electrode tab from the one side of the rectangle which is a basic shape of a positive electrode and a negative electrode, respectively. It protrudes in the shape of a tongue piece, and an electrode tab is ultrasonically bonded to the tongue piece portion.

  In the sealing step shown as the next step S2, the electrode laminated body configured as described above is placed in a flexible film-shaped exterior body. The exterior body is made of, for example, a laminate film having a four-layer structure in which a heat-sealing layer made of polypropylene is laminated inside an aluminum foil and a polyamide resin layer and a polyethylene terephthalate resin layer are laminated on the outside as a protective layer. . The thickness of the entire laminate film is, for example, about 0.15 mm. In this embodiment, the outer package has a two-sheet structure of one laminate film disposed on the lower surface side of the power generation element and another laminate film disposed on the upper surface side. After the electrode laminate is disposed between the films, the surrounding four sides are overlapped with each other leaving an injection port on one side, and thermally fused to each other. Therefore, the exterior body has a bag-like configuration with an open inlet. Here, the two electrode tabs (the positive electrode tab and the negative electrode tab) are located on the side facing the side when the one side having the injection port is directed upward, and are led out through the bonding surface of the laminate film. .

  This sealing step is performed using a pair of heat blocks that heat each of the three sides while sandwiching two laminated films that are superposed on each other and pressing them. The heat block is basically provided with a processing surface along a thin strip-shaped seal line that is continuous in a straight line, and three seal lines along each side intersect with each other at the end, so that the three sides A continuous seal line is constructed.

  In another example, it is also possible to fold a relatively large laminate film into two and configure the exterior body in a form in which the electrode laminate is sandwiched between the two pieces. In this case, the three sides are heat-sealed leaving one side of the inlet.

  Thus, the cell comprised in the state by which the electrode laminated body was accommodated in the film-shaped exterior body in the sealing process is conveyed next to the junction formation process shown as step S3. Here, in order to further limit the movement of the electrode laminate, a joint point formed by locally joining two laminate films to each other is processed on the exterior body in which three sides are heat-sealed. . As will be described later, this junction point is provided at a position closer to the periphery of the electrode laminate than the inner boundary of the seal line, particularly on the side on the electrode tab side. It is formed by heat-sealing by laminating and heating laminated films having a heat-sealing layer within a relatively small dot-like range. In addition, two laminated films may be bonded together by ultrasonic bonding or the like. Details of this junction formation process will be described later.

  The cell that has undergone the junction formation process is then transferred to the liquid injection process shown as step S4. In the liquid injection process, for example, a cell is placed in a decompression chamber, and a liquid injection nozzle of a dispenser is inserted into the inlet of the exterior body under a predetermined pressure reduction to fill (inject) the electrolytic solution.

  When the liquid injection is completed, the injection port is sealed by thermal fusion as an injection port sealing step (step S5) while maintaining the cell posture. The sealing here is a so-called temporary sealing, and after charging, which will be described later, the inlet (or the vicinity thereof) is opened in order to vent the gas generated with the charging. Sealing is performed.

  Next to the inlet sealing step in step S5, as an impregnation step in step S6, the electrode is left for a predetermined time (for example, several hours to several tens of hours) in order to wait for sufficient penetration of the electrolyte into the electrode laminate. Thereafter, in step S7, initial charging is performed. And it progresses to next processes, such as an aging process outside a figure.

  Next, the junction point formation process of step S3 which is the principal part of this invention is demonstrated.

  FIG. 2 shows the cell 1 that has undergone the sealing process of step S2, and as described above, the electrode laminate (power generation element) 3 indicated by a virtual line is accommodated inside the exterior body 2 made of a laminate film. Yes. The electrode laminate 3 includes two positive and negative electrode tabs 4 arranged side by side. The exterior body 2 includes a first side 7 from which the two electrode tabs 4 are led out, a second side 8 opposite to the first side 7, and the first side 7 and the second side on one side. It is configured in a rectangular shape having four sides, a third side 9 connecting the side 8 and a fourth side 10 serving as an injection port. As shown in the figure, the sides 7 and 8 are rectangular short sides, and the sides 9 and 10 are long sides.

  In the sealing step (S2), the three sides 7, 8, and 9 excluding the fourth side 10 serving as the injection port are each heat-sealed by a pair of heat blocks. In FIG. 2, thin strip-shaped seal lines 11, 12, and 13 constituted by heat fusion using a heat block are shown by hatching. These three seal lines 11, 12, and 13 basically extend in a straight line, and intersect with each other at the end portion to form a seal line continuous on three sides. The seal line 11 on the first side 7 is set so as to form a straight line across the two electrode tabs 4, and the two laminated films are joined in a shape sandwiching the electrode tabs 4. . In addition, you may make it heat-process separately the area | region which overlaps with the electrode tab 4 in the seal line 11, and the area | region which does not overlap with the electrode tab 4 using a separate heat block.

  In a state where heat sealing is performed along the continuous seal lines 11, 12, and 13 as described above, between the seal lines 11, 12 and 13 (particularly the inner boundary thereof) and the peripheral edge of the electrode laminate 3, There is an appropriate interval. These intervals can also serve as a volume for storing excess electrolyte in the finally completed cell, and are connected to the electrode tab 4 on the first side 7 on the electrode tab 4 side. A relatively large spacing is provided to accommodate the tongue-like portion of the current collector. For example, in the cell 1 in which the length of the long sides 9 and 10 is about 200 to 250 mm, there is an interval of about 7 to 8 mm on the first side 7 on the electrode tab 4 side. Therefore, if the completed cell 1 receives an impact in the direction along the long sides 9 and 10, the electrode laminate 3 moves, and the tongue-like portion of the current collector made of metal foil or the electrode tab There is a concern that 4 may be deformed.

  FIG. 3 shows the cell 1 that has undergone the junction formation process of step S3. In order to limit the movement of the electrode laminate 3 as described above, in this example, a total of five junctions 15 (15A to 15A) 15E) is formed. These joining points 15 are formed, for example, by sandwiching two laminate films using a pair of relatively small heat blocks, and applying pressure and heating. The junction points 15A, 15B, and 15C are junction points provided at positions closer to the periphery of the electrode laminate 3 than the inner boundary of the seal line 11 on the first side 7 on the electrode tab 4 side. It is provided at a position as close as possible to the periphery of the electrode laminate 3 as long as it does not overlap with the separator or the like of the laminate 3. These joining points 15 </ b> A to 15 </ b> C are formed in a rectangular shape that is long in the direction along the first side 7. These three junction points 15A to 15C are arranged so as to sandwich the two electrode tabs 4 from both sides. That is, the junction point 15 </ b> A is located outside the one electrode tab 4, the junction point 15 </ b> C is located outside the other electrode tab 4, and the junction point 15 </ b> B is located between the two electrode tabs 4. In addition, although these three junction points 15A-15C are arrange | positioned along with the straight line fundamentally, in this invention, it is not necessarily limited to this.

  The junction point 15 </ b> D is a junction point provided at a position close to the periphery of the electrode stack 3 in the fourth side 10 intersecting the first side 7, and is formed in a long rectangle along the fourth side 10. Has been. The junction point 15 </ b> E is a junction point provided at a position close to the periphery of the electrode stack 3 on the third side 9 that intersects the first side 7, and is also formed in a long rectangle along the third side 9. Has been. These joining points 15D and 15E have a function of restricting the movement of the electrode laminate 3 in the rotation direction with the electrode tab 4 as a fulcrum, and therefore, a position as far as possible from the electrode tab 4 as a fulcrum, that is, the first position. 2 is arranged at a position close to the side 8. Here, the joining point 15 </ b> E is formed at a position closer to the periphery of the electrode stack 3 than the inner boundary of the seal line 13 in the third side 9. The junction 15D is formed at a position closer to the periphery of the electrode stack 3 than the inner boundary of the seal line 14 formed along the fourth side 10 in the inlet sealing step after the liquid injection step. Yes. The junction points 15A to 15E may partially overlap with the corresponding seal lines 11, 12, 13, and 14, respectively.

  FIG. 4 is a schematic cross-sectional view (a) along the line AA in FIG. 3 passing through the junction 15A and a schematic cross-sectional view (b) along the line BB passing through the electrode tab 4. It is shown in contrast. As shown in the figure (b), in the range other than the joining points 15A to 15C, the sealing wire 11 by heat sealing and the peripheral edge of the electrode laminate 3 are relatively far apart, and the current collector 21 is between them. It extends to the electrode tab 4. On the other hand, at the locations of the junction points 15A to 15C, as shown in FIG. 1A, the junction points 15A to 15C are located close to the peripheral edge of the electrode laminate 3, and the two laminates that become the outer package 2 are provided. Since the film is closed, even if an impact is applied from the outside, the movement of the electrode laminate 3 toward the seal line 11 is suppressed. In addition, the number of the junction points 15 in the 1st edge | side 7 is not restricted to three, What is necessary is just at least 1 point.

  Further, since the joint points 15D and 15E are similarly positioned close to the periphery of the electrode laminate 3, the rotation of the electrode laminate 3 with the electrode tab 4 as a fulcrum is suppressed. In particular, since the junction 15D is provided before the fourth side 10 is heat-sealed, the electrode stack 3 is attached to the exterior body 2 during the transportation of the cell 1 to the liquid injection step (S4). It also contributes to holding in place. In addition, you may abbreviate | omit these junction points 15D and 15E, especially the junction point 15E.

  The processing positions of the junction points 15A to 15E, particularly the processing positions of the junction points 15A to 15C along the first side 7 (positions in the long side direction of the cell 1) are the actual positions of the electrode laminate 3 in the exterior body 2. It is desirable to correspond to the position of the peripheral edge.

  In one embodiment, the position of the electrode tab 4 is detected using a sensor or a camera, and the processing positions (positions in the long side direction of the cell 1) of the joining points 15A to 15C are determined using the position of the electrode tab 4 as a reference. Set. That is, as shown in FIG. 5, it is assumed that the distance X1 from the tip of the electrode tab 4 to the periphery of the electrode laminate 3 is a predetermined value, and the tip position of the electrode tab 4 actually detected (for example, the position of the corner of the tip). ) Are joined at positions X2 (X2 <X1).

  Here, in order to bring the joining points 15A to 15C closer to the periphery of the electrode laminate 3 with higher accuracy, the electrode tab 4 is joined at the stage where the electrode tab 4 is joined to the electrode laminate 3 in the electrode lamination step (S1). The actual distance X1 from the tip of the electrode stack 3 to the periphery of the electrode laminate 3 may be measured individually, and the processing positions of the joining points 15A to 15C may be corrected based on this measurement data. In this way, the junction points 15A to 15C are set at positions closer to the peripheral edge of the electrode laminate 3 without being affected by variations in lamination of the positive electrode and the negative electrode, variations in bonding of the electrode tab 4, and the like. Is possible. For example, in the electrode stacking step (S1), when stacking is performed based on the negative electrode, the relative positional relationship (that is, the distance X1) between the electrode tab 4 on the negative electrode side and the periphery of the electrode stack 3 after the electrode tab 4 is joined. ), And the positions of the electrode tabs 4 on the negative electrode side are also detected in the bonding point forming step (S3), and the positions of the bonding points 15A to 15C are preferably set based on the detected positions.

  Further, when setting the processing positions of the joining points 15A to 15C, the position of the peripheral edge of the electrode laminate 3 in the exterior body 2 is detected from the outside, and the processing positions of the joining points 15A to 15C are determined based on this detection position. You may make it set.

  FIG. 6 is an explanatory diagram showing an example of a method for detecting the peripheral position of the electrode laminate 3, using a rotatable roller 25 as a contactor, while contacting the surface of the exterior body 2 with an appropriate pressure force, As indicated by the arrow DA, the roller 25 is moved along the long side direction of the cell 1 so as to approach the first side 7 from a position above the electrode laminate 3. Since the reaction force received by the roller 25 changes with the position of the peripheral edge of the electrode stack 3 as a boundary, the position of the peripheral edge of the electrode stack 3 can be detected relatively easily by a load change detected by, for example, a load cell. it can. Alternatively, since the position in the thickness direction of the cell 1 of the roller 25 as a contact changes with the position of the peripheral edge of the electrode laminate 3 as a boundary, the position of the peripheral edge of the electrode laminate 3 is detected by the change in position. Can do.

  You may make it detect the peripheral position of the electrode laminated body 3 in the several location of the 1st edge | side 7 using the some roller 25 (contactor). Further, a contact having another shape can be used as the contact.

  As another example, the actual peripheral position of the electrode stack 3 may be detected by transmitting X-rays to the cell 1. FIG. 7 is an explanatory diagram of the setting of the machining position using this X-ray. As shown in FIG. 7, the electrode laminate 3 includes a positive electrode 31 provided with active material layers 31b on both sides of a current collector 31a made of aluminum foil, and an active material layer 32b on both sides of a current collector 32a made of copper foil. A large number of negative electrodes 32 provided with a separator 33 made of polypropylene or the like are laminated. Since the current collector of the negative electrode 32 made of copper foil blocks X-rays, the edge position is detected by an inspection device using X-rays. The positive electrode 31 and the separator 33 transmit X-rays and cannot be detected. However, since the positive electrode 31 is formed slightly smaller than the negative electrode 32, there is no problem. On the other hand, since the separator 33 is slightly larger than the negative electrode 32, the position of the outermost edge of the electrode laminate 3 is slightly outside the edge position of the negative electrode 32 detected by X-rays.

  As shown in FIG. 7, the processing positions XA of the joining points 15A to 15C are set at positions separated from the detection position XB by X-rays by an appropriate margin. Specifically, a predetermined distance X3 is given between the inner boundary of the joint region of the joint point 15 and the detection position XB.

  In addition, when detecting the peripheral position of the electrode laminated body 3 using X-rays in this way, it is also easy to individually control the processing positions of the three joining points 15A to 15C. Also, the junction points 15D and 15E can be arranged closer to the peripheral position of the electrode laminate 3.

  As described above, according to the cell 1 and the manufacturing method of the above embodiment, the junction 15 is locally located at a position closer to the periphery of the electrode laminate 3 than the seal lines 11, 13, and 14 that seal the outer package 2. Therefore, the movement of the electrode laminated body 3 in the exterior body 2 is suppressed. At least the movable amount of the electrode laminate 3 within the exterior body 2 is shortened. Therefore, it is not necessary to add a configuration in which a tongue piece portion is provided in the separator and is sandwiched between exterior bodies as disclosed in Patent Document 1 described above, and the electrode laminate projected area that does not contribute to battery capacity is increased. Can be avoided. In addition, when the separator has a ceramic layer as in the above embodiment, it is difficult to bond to the laminate film of the exterior body by heat fusion. Requires a troublesome bonding process such as ultrasonic bonding. In the said Example, joining of such a separator and a laminate film is unnecessary.

  In the above embodiment, it is only necessary to process the joining point 15 on the laminate film using a relatively small heat block, and there is no addition of new members or expansion of the area of each member. Further, the battery capacity is not impaired at all.

  In addition, if necessary, the joint point 15 of the present invention can be used in combination with a configuration in which a tongue piece portion is provided on a separator and sandwiched between exterior bodies as disclosed in Patent Document 1. For example, in the case of a separator that does not have a ceramics layer, the tongue piece can be heat-sealed to the laminate film simultaneously with the heat sealing of the outer package. Even in such a case, the application of the joint point 15 of the present invention provides an advantage that, for example, the separator tongue portion can be further reduced in size, and more reliably restricts the movement of the electrode laminate on both sides. Will be able to.

DESCRIPTION OF SYMBOLS 1 ... Cell 2 ... Exterior body 3 ... Electrode laminated body 4 ... Electrode tab 11-14 ... Seal wire 15 (15A-15E) ... Junction point 21 ... Current collector 31 ... Positive electrode 32 ... Negative electrode 33 ... Separator

Claims (10)

An electrode laminate in which a plurality of positive electrodes and negative electrodes are laminated via a separator;
An outer package that is configured in a bag shape by heat-sealing the periphery of a laminate film provided with a heat-fusible layer, and contains the electrode laminate together with an electrolyte solution;
A film-clad battery in which positive and negative electrode tabs of the electrode laminate are led out through a joint surface on one side of the exterior body,
On one side of the exterior body on the electrode tab side, the laminate films are locally joined to a position closer to the periphery of the electrode laminate than the inner boundary of the seal line continuously set across the electrode tab. A film-clad battery comprising at least one bonded point.   2. The film-clad battery according to claim 1, comprising three junction points on one side of the electrode tab side between two positive and negative electrode tabs and on the outside of each electrode tab.   Furthermore, in the other side of the exterior body that intersects with one side of the electrode tab side, the junction point is positioned closer to the periphery of the electrode stack than the inner boundary of the seal line that is continuously set on the side. The film-clad battery according to claim 1, comprising:   The film-clad battery according to claim 1, wherein the separator includes a ceramic layer on at least one surface of the synthetic resin layer. An electrode stacking step of stacking a plurality of positive electrodes and negative electrodes through a separator and forming an electrode stack including positive and negative electrode tabs on one side;
The electrode laminate is accommodated in an exterior body in which two laminated films each having a heat-sealing layer are stacked or folded in two, and the periphery including the side where the electrode tab is led out, leaving an injection port. A sealing step in which each side is heated and sealed along a continuously set seal line;
One or a plurality of joints by locally joining the laminate films at least on one side of the electrode tab side of the outer package at a position closer to the periphery of the electrode laminate than the inner boundary of the seal line of the side A junction forming step for forming a point;
A liquid injection step of injecting an electrolytic solution into the exterior body through the injection port;
A method for producing a film-clad battery comprising:   In the bonding point forming step, the position of the electrode tab derived from the exterior body is detected, and the processing position of the bonding point on one side of the electrode tab side is set on the basis of the position of the electrode tab. The method for producing a film-clad battery according to claim 5.   The film according to claim 6, wherein the relative positions of the electrode tabs in the electrode laminate subjected to the electrode lamination step are individually measured, and the processing position of the joining point is corrected based on the measurement data. A method for manufacturing an exterior battery.   In the bonding point forming step, the peripheral position of the electrode tab side of the electrode stack in the outer package or the side facing the electrode tab is detected, and the electrode tab side of the electrode tab side is detected based on the detected position. The manufacturing method of the film-clad battery according to claim 5, wherein a processing position of the joint point on one side is set.   The manufacturing method of the film-clad battery according to claim 8, wherein the peripheral position of the electrode laminate is detected by moving a contact member in contact with the surface of the exterior body along the surface of the exterior body. Method.   The method for producing a film-clad battery according to claim 8, wherein the peripheral position of the electrode laminate is detected by transmission of X-rays.

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