JP2019029324A - Method of manufacturing film-coated battery - Google Patents

Abstract

To provide a method of manufacturing a film-coated battery, in which a first side 7 including electrode tabs 4, 5 can be sealed in a short period of time.SOLUTION: In a method of manufacturing a film-coated battery, a tab area 11a corresponding to a positive electrode tab 4 and non-tab areas 11c, 11d on both sides are sealed by ultrasonic bonding process in a sealing line 11 along a first side 7 (step (a)). Then, a tab area 11b corresponding to a negative electrode tab 5 and non-tab areas 11d, 11e on both sides are sealed by ultrasonic bonding process (step (b)). A second side 8 and a third side 9 are sealed by heat-fusing using a heat block (step (c)).SELECTED DRAWING: Figure 3

Description

  The present invention relates to a method for manufacturing a film-clad battery in which a power generation element is housed together with an electrolyte in an exterior body made of a laminate film having flexibility, and in particular, laminating in a state where an electrode tab protruding from the power generation element is sandwiched. The present invention relates to an improvement in a sealing process for joining films.

  For example, as a lithium ion secondary battery, a flat element in which a power generation element formed by laminating a plurality of positive electrodes and negative electrodes through a separator is housed together with an electrolyte in an exterior body made of a laminate film having a heat-fusible layer A film-sheathed battery is known. In this type of film-clad battery, as disclosed in Patent Document 1, on one side of the outer package from which the electrode tab is derived, a positive and negative electrode tab made of a thin metal plate is sandwiched between the joining surfaces. Two laminated films are heat-sealed.

JP 2010-244725 A

  In patent document 1, after heat-sealing the whole one side of the exterior body from which an electrode tab is derived | led-out by a 1st heat block, only the site | part adjacent to an electrode tab is heat-pressed by a 2nd heat block, and an electrode The gap adjacent to the tab is filled.

  That is, in the sealing process by the first heat block, both the part where the laminate films are joined without the electrode tab and the part where the electrode tab is interposed are simultaneously heat-sealed by the same heat block. I am doing so.

  However, the electrode tab made of metal not only has a large heat capacity, but also is deprived of heat by the positive and negative electrode metal current collectors because it is connected to the power generation element inside the exterior body. Therefore, in the heat sealing method using the heat block, the processing time required for heat sealing of the side having the electrode tab takes longer than the processing time required for heat sealing of the other side, and the entire sealing process is performed. This is a major factor in increasing the cycle time.

  Therefore, the present invention performs ultrasonic processing by ultrasonic bonding along a seal line continuously set across the electrode tab on one side of the exterior body in which at least one electrode tab is arranged, and The nodal point of the horn was set so that the ultrasonic bonding energy given to the area that overlaps with the electrode tab in the seal line of the electrode was larger than the ultrasonic bonding energy given to the area that did not overlap with the electrode tab. .

  The horn, which is a tool for ultrasonic bonding, can set the nodal point (a point where the amplitude is 0) to a desired position by designing the mass distribution of each part. Then, the ultrasonic energy given to the work becomes small. By setting the nodal point so that the ultrasonic bonding energy given to the area that overlaps the electrode tab is larger than the ultrasonic bonding energy given to the area that does not overlap the electrode tab, there is more to the area that overlaps the electrode tab. Thus, the vicinity of the electrode tab can be sealed in a short time.

  According to this invention, it becomes possible to process the sealing process in one side of the exterior body in which an electrode tab is inserted | pinched in a short time, and shortening of the cycle time of the sealing process of the whole exterior body can be aimed at.

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. Process explanatory drawing of a sealing process. Explanatory drawing of the ultrasonic bonding process of a process (a). Explanatory drawing of the ultrasonic bonding process of a process (b). Explanatory drawing of the horn used for ultrasonic bonding processing. Process explanatory drawing of the sealing process of 2nd Example. Explanatory drawing of the ultrasonic bonding process in the sealing process of 2nd Example. Process explanatory drawing of the sealing process of 3rd Example. Explanatory drawing of the ultrasonic bonding process in the sealing process of 3rd Example.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. First, an outline of the manufacturing process of the film-clad battery will be described with reference to the process explanatory diagram of FIG. In this embodiment, as an example of a film-clad battery serving as a workpiece, 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. In this film-clad battery, a plurality of positive electrodes and negative electrodes configured in a rectangular sheet shape are stacked via a separator to form an electrode laminate (that is, a power generation element), and the electrode laminate is formed into a bag-like shape made of a laminate film. It is housed together with the electrolyte in the exterior body. 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 in FIG. 1 is an electrode stacking process that constitutes an electrode stack. 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 is made of, for example, a microporous film of a synthetic resin such as polyethylene (PE) or polypropylene (PP) or a nonwoven fabric.

  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 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 electrode laminate and another laminate film disposed on the upper surface side. After the electrode laminate is disposed between the laminate films, the surrounding four sides are overlapped with each other leaving an inlet and joined together. Therefore, the exterior body has a bag-like configuration with an open inlet. Here, 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 from the bonding surface of the laminate film. In the present invention, this sealing step is performed as a combination of ultrasonic bonding processing using an ultrasonic bonding apparatus and heat fusion processing using a heat block.

  In another example, it is possible to fold a relatively large laminate film into two and configure the exterior body in such a manner that the power generation element is sandwiched between the two pieces. In this case, the three sides are joined 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 next conveyed to the liquid injection process shown as step S3. 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 S4) 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 S4, as an impregnation step in step S5, 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 S6, initial charging is performed. And it progresses to next processes, such as an aging process outside a figure.

  FIG. 2 shows the cell 1 that has undergone the sealing step of step S2, and as described above, the electrode laminate 3 indicated by a virtual line is accommodated in the exterior body 2 made of a laminate film. The electrode laminate 3 includes a positive electrode tab 4 and a negative electrode tab 5 arranged side by side. The exterior body 2 includes a first side 7 from which a positive electrode tab 4 and a negative electrode tab 5 (both are collectively referred to as an electrode tab) are derived, and a second side 8 that faces the first side 7; On the negative electrode tab 5 side, it is configured in a rectangular shape having four sides of a third side 9 connecting the first side 7 and the second side 8 and a fourth side 10 serving as an injection port.

  In the sealing step, the three sides 7, 8, and 9 excluding the fourth side 10 serving as the injection port are sealed in a linear shape. FIG. 2 shows thin strip-shaped seal lines 11, 12, and 13 formed by ultrasonic bonding or heat fusion, with hatching. These three seal lines 11, 12, and 13 basically extend in a straight line, and form a continuous seal line by crossing each other at the end. The seal line 12 on the second side 8 and the seal line 13 on the third side 9 are obtained by bonding the laminate films together. On the other hand, the seal line 11 on the first side 7 is set continuously so as to form a straight line across the positive electrode tab 4 and the negative electrode tab 5, and the two laminated films are formed on the positive electrode tab. 4 and the negative electrode tab 5 are joined together.

  In other words, the seal line 11 on the first side 7 includes two regions (hereinafter referred to as tab regions) 11a and 11b where the electrode tabs 4 and 5 and the laminate film overlap, and the electrode tabs 4 and 5. 3c (referred to as non-tab regions) 11c, 11d, and 11e where the laminated films are joined to each other without overlapping with each other, and these are continuous one strip-like seal A line 11 is formed. Specifically, on the surfaces of the electrode tabs 4 and 5, a synthetic resin layer called “adhesive resin” is provided in advance in a band shape corresponding to the portion where the seal line 11 crosses. In the tab regions 11 a and 11 b, A synthetic resin layer (heat-sealing layer) of a laminate film is bonded on the synthetic resin layer. In one embodiment, two strip-shaped polypropylene films are attached to the surface of the electrode tabs 4 and 5 so as to sandwich the electrode tabs 4 and 5 from both sides of the electrode tabs 4 and 5, as shown in FIG. As described above, the leading resin 15 is formed, and the sealing wire 11 crosses over the leading resin 15.

  Thus, sealing at the first side 7 where the electrode tabs 4 and 5 are located is performed by ultrasonic bonding using an ultrasonic bonding apparatus. And sealing of the 2nd edge | side 8 and the 3rd edge | side 9 with which laminated films are joined is performed by the method of the heat-fusion which pinches | interposes a laminate film with a pair of heat block, and heats.

  FIG. 3 shows an example of a specific sequence of steps for sealing the above-described three seal lines 11, 12, and 13. In the first step (a), the sealing of the tab region 11 a overlapping the positive electrode tab 4 in the seal line 11 on the first side 7 and the two non-tab regions 11 c and 11 d located on both sides of the positive electrode tab 4 are performed. Processing is performed by ultrasonic bonding.

  In the next step (b), the sealing of the tab region 11 b overlapping the negative electrode tab 5 in the seal line 11 on the first side 7 and the two non-tab regions 11 d and 11 e located on both sides of the negative electrode tab 5 are performed. Processing is performed by ultrasonic bonding.

  Here, in the intermediate non-tab region 11d located between the two electrode tabs 4 and 5, the ultrasonic bonding region in step (a) and the ultrasonic bonding region in step (b) are at least partially. By overlapping, the seal line 11 along the first side 7 is formed as a continuous line.

  In the next step (c), the sealing process of the seal line 12 along the second side 8 and the sealing process of the seal line 13 along the third side 9 are performed simultaneously. This is performed by using a pair of heat blocks configured in an L shape corresponding to the two sides 8 and 9 and heating while applying pressure with a pressure and temperature suitable for joining the laminate films. Here, the end of the seal wire 13 formed by heat fusion intersects with the end of the seal wire 11 formed by ultrasonic bonding. Accordingly, the three seal lines 11, 12, and 13 are continuous with each other, whereby the exterior body 2, that is, the laminate film is formed in a bag shape. Note that the heat sealing of the second side 8 and the heat sealing of the third side 9 may be performed separately.

  The ultrasonic bonding is performed by using an ultrasonic bonding apparatus including a horn 21 and an anvil 22 as shown in FIG. The horn 21 includes a large-diameter base 24 connected to an oscillator (not shown), a cylindrical portion 26 connected to the tip of the large-diameter base 24 via a tapered portion 25, and a part of the peripheral surface of the cylindrical portion 26. And a processing chip 27 serving as a tool provided on the machine. The processing chip 27 may be formed integrally with the cylindrical portion 26 or may be formed separately and attached to the cylindrical portion 26. The processing chip 27 includes a processing surface 28 that comes into contact with the exterior body 2 of the cell 1 serving as a workpiece. Specifically, FIG. 6 shows the horn 21 used in the ultrasonic bonding process of the step (a). As the processing surface 28, a central processing surface 28a corresponding to the tab region 11a and non-tab regions 11c and 11d are provided. Processing surfaces 28b and 28c on both sides corresponding to each other. In consideration of the thickness of the positive electrode tab 4 (more specifically, the thickness including the tip resin 15), a step is provided between the central processed surface 28a and the processed surfaces 28b and 28c on both sides. That is, the central processing surface 28a is relatively retracted so that the pressing force per unit area at each portion is substantially equal. The processed surface 28 has so-called knurled fine irregularities. The anvil 22 is formed flat in the illustrated example. So-called knurled fine irregularities may also be provided on the anvil 22 side. Strictly speaking, the position of the boundary between the central processed surface 28a and the processed surfaces 28b, 28c on both sides is determined by the thickness of the resin 15 that covers the side edges of the positive electrode tab 4 and the amplitude of the horn 21 during ultrasonic bonding. Etc. are set in consideration. The horn 21 includes nodal points NP1 and NP2 having an amplitude of 0 at two points (positions that do not overlap with the processing chip 27) on both sides of the processing chip 27 serving as the processing surface 28. The position of the nodal point can be obtained at an arbitrary position by mass distribution of the horn 21 or the like.

  The horn 21 is sandwiched between the anvil 22 and the cell 1 serving as a workpiece, and as shown by an arrow P in the figure, the horn 21 has a predetermined direction toward the anvil 22 along a direction orthogonal to the central axis of the horn 21. Pressurized with pressure. Then, while applying a pressing force, vibration is applied along the central axis of the horn 21 with a frequency of about 20 kHz, for example, as indicated by an arrow S. Thereby, vibration energy is given to the work from the processed surface 28, and the boundary surface (the interface between the adhesive resin 15 and the heat fusion layer of the laminate film in the tab region 11a, and the heat adhesion of the laminate film in the non-tab regions 11c and 11d). Frictional heat is generated at the interface between the layers, and the temperature rises instantaneously and welds together.

  FIG. 4 shows the processed surface 28 and nodal points NP1 and NP2 of the horn 21 and the amplitude of each part of the horn 21 in the ultrasonic bonding process in the first step (a) performed using the horn 21 as described above. It is explanatory drawing which showed the positional relationship etc. with the cell 1 which is a workpiece | work. The amplitude is greatest at the midpoint between the two nodal points NP1 and NP2 of the horn 21, and the central processing surface 28 a including this midpoint overlaps the positive electrode tab 4. And the amplitude in the processing surfaces 28b and 28c on both sides corresponding to the non-tab regions 11c and 11d is relatively small. Therefore, relatively large ultrasonic bonding energy is given in the tab region 11a, and ultrasonic bonding energy is relatively small in the non-tab regions 11c and 11d. Thereby, in both the tab area | region 11a and the non-tab area | regions 11c and 11d, it can seal reliably by a short time ultrasonic bonding process. In the vicinity of the nodal points NP1 and NP2 of the horn 21, the ultrasonic bonding energy is almost zero, and the bonding action cannot be obtained.

  FIG. 5 is also an explanatory diagram of the ultrasonic bonding process in the step (b) for the range including the negative electrode tab 5. In this ultrasonic bonding process, a horn 21 similar to that shown in FIG. 6 is used. The processing chip 27 of the horn 21 includes a central processing surface 28a corresponding to the tab region 11b of the negative electrode tab 5, and processing surfaces 28b and 28c on both sides corresponding to the non-tab regions 11d and 11e, respectively. The center processing surface 28a is set back relative to the processing surfaces 28b and 28c on both sides. The step here is set in consideration of the thickness of the negative electrode tab 5 (more specifically, the thickness including the leading resin 15).

  Also in the ultrasonic bonding process of this step (b), relatively large ultrasonic bonding energy is given to the tab region 11b overlapping the negative electrode tab 5, and in both the tab region 11b and the non-tab regions 11d and 11e, a short time is applied. With this ultrasonic bonding process, reliable sealing can be obtained. The nodal points NP1 and NP2 of the horn 21 are set at two points on both sides, which are also outside the processed surface 28, and almost no ultrasonic bonding energy is applied in the vicinity of the nodal points NP1 and NP2.

  Thus, in the first embodiment, the sealing process of the seal line 11 at the first side 7 across the electrode tabs 4 and 5 is performed by two ultrasonic bonding processes, but each process is very short. Since time is sufficient, for example, the sealing can be completed in a short cycle time even when the entire first side 7 is sandwiched between a pair of heat blocks and heat-sealed.

  Next, FIG. 7 is explanatory drawing which showed the process of the sealing process of each seal line 11, 12, 13 in 2nd Example. In the first step (a), only the tab region 11a overlapping the positive electrode tab 4 in the seal line 11 on the first side 7 is sealed by ultrasonic bonding.

  In the next step (b), only the tab region 11b overlapping the negative electrode tab 5 in the seal line 11 on the first side 7 is sealed by ultrasonic bonding.

  In the next step (c), the three non-tab regions 11c, 11d, and 11e on the first side 7 are sealed by heat fusion using a pair of heat blocks.

  In addition, the process area | region by the ultrasonic bonding of process (a), (b) and the process area | region by the heat fusion of process (c) are set so that each edge part may overlap slightly. Thereby, the seal line 11 along the first side 7 is formed as a continuous one.

  In the next step (d), the sealing process of the seal line 12 along the second side 8 and the sealing process of the seal line 13 along the third side 9 are simultaneously performed by heat fusion. This is the same as step (c) of the first embodiment described above.

  FIG. 8 shows the processed surface 28 of the horn 21 and the nodal points NP1 and NP2, the amplitude of each part of the horn 21, and the cell 1 as a workpiece in the ultrasonic bonding process in the step (a) of the second embodiment. It is explanatory drawing which showed the positional relationship of. The horn 21 used in the second embodiment has a flat basic shape with a processed surface 28 corresponding to the tab region 11a. In addition, as described above, so-called knurled fine irregularities may be provided. Then, nodal points NP1 and NP2 are set at two points on both sides which are outside the processed surface 28a. Therefore, a large ultrasonic bonding energy is applied to the tab region 11a, and no ultrasonic bonding energy is applied to the non-tab regions 11c and 11d. Thereby, the tab area | region 11a can be reliably sealed with a short time ultrasonic bonding process.

  The ultrasonic bonding process on the negative electrode tab 5 side in the step (b) is similarly performed.

  Further, the heat fusion in the step (c) can be performed using a heat block formed by projecting three processed surfaces corresponding to the three non-tab regions 11c and 11d.

  Next, FIG. 9 is explanatory drawing which showed the process of the sealing process of each seal line 11,12,13 in 3rd Example. In the third embodiment, in the first step (a), the entire seal line 11 on the first side 7 is sealed by ultrasonic bonding.

  In the next step (b), the sealing process of the seal line 12 along the second side 8 and the sealing process of the seal line 13 along the third side 9 are simultaneously performed by heat fusion. This is the same as step (c) of the first embodiment described above.

  FIG. 10 shows the processed surface 28 and nodal points NP1 and NP2, the amplitude of each part of the horn 21, and the cell 1 as a workpiece in the ultrasonic bonding process in the step (a) of the third embodiment. It is explanatory drawing which showed the positional relationship of. The horn 21 used in the third embodiment corresponds to the two processed surfaces 28A and 28B corresponding to the two tab regions 11a and 11b and the three non-tab regions 11c, 11d and 11e, respectively, as the processed surface 28. Three processed surfaces 28C, 28D, and 28E. The processed surfaces 28A and 28B for the tab regions 11a and 11b are in consideration of the thicknesses of the positive electrode tab 4 and the negative electrode tab 5 (more specifically, the thickness including the tip resin 15), and the non-tab regions 11c, 11d, It is retreated with respect to the processed surfaces 28C, 28D, 28E for 11e. Of the three processed surfaces 28C, 28D, and 28E for the non-tab regions 11c, 11d, and 11e, the processed surface 28D located at the center is set back relative to the processed surfaces 28C and 28E on both sides. That is, the height of each processing surface is set so that the pressing force per unit area on the processing surface 28D located at the center is lower than the pressing force per unit area on the processing surfaces 28C and 28E on both sides. Yes. By suppressing this applied pressure, the ultrasonic bonding energy given to the workpiece by the central processed surface 28D during ultrasonic bonding is reduced. In other words, in consideration of the respective thicknesses of the positive electrode tab 4 and the negative electrode tab 5 and the optimum distribution of the applied pressure of each part, the steps between the processed surfaces 28A to 28E are set. In addition, while providing so-called knurled fine unevenness on the processed surface 28 except the central processed surface 28D, the central processed surface 28D is made flat without unevenness so as to suppress concentration of ultrasonic bonding energy. It may be. The horn 21 includes nodal points NP1 and NP2 having an amplitude of 0 at two points on both sides of the processing chip 27 serving as the processing surface 28 (positions that do not overlap with the processing chip 27).

  In the third embodiment, the amplitude of each part of the horn 21 is 0 at the nodal points NP1 and NP2 as shown in the figure, and becomes large at the intermediate portion overlapping the two electrode tabs 4 and 5. Therefore, the tab regions 11a and 11b overlapping the electrode tabs 4 and 5 can be reliably sealed in a short time. In addition, the amplitude of the horn 21 is maximized in the non-tab region 11d between the two electrode tabs 4 and 5, but the machining surface 28D is relatively retracted with respect to the non-tab region 11d as described above. Therefore, the ultrasonic bonding energy that actually acts is reduced. Preferably, ultrasonic bonding energy equivalent to that of the other two non-tab regions 11c and 11e is applied to the non-tab region 11d. Thereby, good sealing with an appropriate energy distribution can be obtained in each of the two tab regions 11a and 11b and the three non-tab regions 11c, 11d, and 11e.

  In each of the above-described embodiments, the ultrasonic bonding process related to the first side 7 is performed first, and the heat-bonding process of the second side 8 and the third side 9 is performed later. The order of these processes can be changed as appropriate.

  Moreover, in the said Example, although the two electrode tabs 4 and 5 were arrange | positioned along with one side of the cell 1, the positive electrode tab 4 and the negative electrode tab 5 were arrange | positioned separately at the two mutually opposing sides of the cell 1. The present invention can also be applied to a film-clad battery having a configuration.

DESCRIPTION OF SYMBOLS 1 ... Cell 2 ... Exterior body 4 ... Positive electrode tab 5 ... Negative electrode tab 7 ... 1st edge 8 ... 2nd edge 9 ... 3rd edge 11, 12, 13 ... Seal wire 21 ... Horn 22 ... Anvil 28 ... Processing Surface NP1, NP2 ... Nodal point

Claims (7)

A power generation element formed by laminating a plurality of positive electrodes and negative electrodes through a separator is housed together with an electrolyte in an exterior body made of a laminate film, and an electrode tab of the power generation element is led out from a bonding surface of the laminate film. A method for producing a film-clad battery,
On one side of the exterior body where at least one electrode tab is disposed, and performing sealing processing along a seal line continuously set across the electrode tab by ultrasonic bonding,
Set the nodal point of the horn so that the ultrasonic bonding energy given to the area that overlaps the electrode tab in the seal line is greater than the ultrasonic bonding energy given to the area that does not overlap the electrode tab. A method for producing a film-clad battery, characterized in that:   2. The film-clad battery according to claim 1, wherein sealing is performed by ultrasonic bonding for each electrode tab using a horn having a nodal point at two points on both sides sandwiching one electrode tab. Manufacturing method. Two electrode tabs are arranged on one side of the exterior body,
Using a horn having a step corresponding to the thickness of the electrode tab on the processing surface, ultrasonic bonding is performed for each electrode tab, and a continuous seal is obtained by partially overlapping the area of the two ultrasonic bondings. The method for producing a film-clad battery according to claim 2, comprising a wire. Two electrode tabs are arranged on one side of the outer package, and the laminate film has a heat-sealing layer,
Using a horn having a machining surface corresponding to one electrode tab, the area overlapping with the electrode tab is individually ultrasonically bonded,
The film exterior according to claim 2, wherein a region that does not overlap with the electrode tab between the two electrode tabs is heat-sealed by a heat block to form a continuous seal line with the ultrasonic bonding portion. Battery manufacturing method. Two electrode tabs are arranged on one side of the exterior body,
The processing surface of the horn has a length including these two electrode tabs and a step corresponding to the thickness of each electrode tab, and the horn has nodal points at two points on both sides of the processing surface. With points,
The side of the exterior body is sealed by ultrasonic bonding using the horn, and the step on the processed surface is set so that the applied pressure in the region between the two electrode tabs becomes relatively small. The manufacturing method of the film-clad battery of Claim 2 characterized by the above-mentioned. The laminate film has a heat sealing layer,
The method for producing a film-clad battery according to claim 1, wherein the other side not provided with the electrode tab is heat-sealed by a heat block.   The said electrode tab is equipped with the synthetic resin layer previously in the site | part which the said seal line crosses, The manufacturing method of the film-clad battery in any one of Claims 1-6 characterized by the above-mentioned.

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