JP2018120803A - Method for manufacturing film package battery and film package battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To fix an electrode laminate 3 in an outer packaging body 2 without ultrasonic bonding in a film package battery 1 in which a separator 33 with a ceramic layer is used.SOLUTION: A separator 33 has a ceramic layer on its surface, and a tongue part 33a partially projecting at one side. An electrode laminate 3 is enclosed by two laminate films 35. Subsequently, the laminate films are fusion bonded, and heat blocks 22 for separator fusion bonding are used to push the laminate films 35 toward inside a cell 1 along the perimeter of the tongue part 33a and in parallel, the laminate films are heated. At an end face of the cut tongue part 33a, a synthetic resin layer is not covered with a ceramic layer, but exposed. Therefore, the heat fusion layer of the laminate film 35 is fusion bonded to a synthetic resin layer end face.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a method for manufacturing 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 particularly in a state where the electrode laminate is accommodated. The present invention relates to an improvement in a sealing process for heat-sealing a laminate film.

  For example, as a lithium ion secondary battery, an electrode laminate (also referred to as a power generation element) in which a plurality of positive electrodes and negative electrodes are laminated via a separator is electrolyzed in an outer package made of a laminate film having a heat-sealing layer. A film-sheathed battery having a flat shape housed together with a liquid 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.

  On the other hand, in Patent Document 1, in order to prevent displacement of the electrode laminate in the exterior body, a tongue piece part that partially protrudes on one side of the separator is provided, and at the time of sealing the exterior body made of a laminate film, It is disclosed that a separator tongue portion is sandwiched between two laminate films and bonded together by ultrasonic bonding or the like.

International Publication No. 2012/066683

  In recent years, as a separator constituting an electrode laminate, a separator having a ceramic layer serving as a heat-resistant layer on its surface is known. In such a separator having a ceramic layer on its surface, the ceramic layer must be destroyed. It cannot be heat-sealed with a laminate film. Therefore, as disclosed in Patent Document 1, a troublesome process such as ultrasonic bonding of the tongue portion of the separator to the laminate film is required. Ultrasonic bonding is not preferable because the equipment is large and expensive as compared with heat sealing using a heat block.

  The method for producing a film-clad battery according to the present invention is the same as the laminated film sealing step in which two laminated films are heat-sealed by a sealing heat block on one side of the outer package corresponding to one side of the separator. On one side, a separator fusing step of fusing the heat-fusible layer of the laminate film to the end surface of the separator by heating the laminate film while pushing it inward along the edge of the electrode laminate by a heat block for fusing the separator, Prepare in any order of steps.

  For example, even if the separator has a ceramic layer on both sides, the base material of the separator made of a synthetic resin material is exposed on the end face of the separator cut by a cutter or the like. Therefore, in the separator fusion step, the laminate film is heated while being pushed inward along the edge of the electrode laminate, whereby the heat fusion layer of the laminate film and the separator end face are at least partially thermally fused. As a result, the electrode laminate is less likely to move in the exterior body made of the laminate film.

  According to this invention, even when a separator having a ceramic layer on the surface is used as a separator constituting the electrode laminate, ultrasonic bonding for fixing the electrode laminate to the exterior body is unnecessary. In addition to the heat sealing of the outer periphery of the outer package, it can be easily performed by heating with a heat block.

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 which shows the laminate film sealing process in the edge | side which has a tongue piece part. Explanatory drawing which shows the separator melt | fusion process in the same edge | side. The top view of the heat block for sealing used for a laminate film sealing process. The top view of the separator fusing heat block used for a separator fusing process. Cross-sectional explanatory drawing which showed typically the fusion | melting state of one separator and a laminate film.

  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. The film-clad battery of one example has basically the same configuration as that described in Japanese Patent Application Laid-Open No. 2013-140782, Japanese Patent Application Laid-Open No. 2015-37047, and the like, and is a positive electrode configured in a rectangular sheet shape. A power generation element (which is also referred to as an electrode laminate) is formed by laminating a plurality of anodes and a negative electrode via a separator, and the electrode laminate is accommodated in a bag-like exterior body made of a laminate film together with an electrolyte. It is. 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 plurality of positive electrodes and negative electrodes are stacked through separators, that is, an electrode 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. In one embodiment, ceramic layers are provided on both sides of a synthetic resin layer made of polypropylene. In addition, as will be described later, in one embodiment, a tongue piece is provided on one side of the separator for fixing the electrode laminate to the exterior body.

  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, leaving one side of the inlet, and thermally fused 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. Details of this sealing step will be described later.

  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 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.

  Next, the sealing process of step S2, which is the main part of the present invention, will be described.

  FIG. 2 shows the cell 1 that has undergone the sealing step. As described above, the electrode laminate 3 indicated by the phantom 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 (both are collectively referred to as electrode tabs) arranged side by side. Moreover, the separator which comprises the electrode laminated body 3 is provided with the tongue piece part 33a which protruded partially as mentioned above in the center part of one side. The tongue piece 33a is provided on the side opposite to the side where the electrode tabs 4 and 5 are located in the assembled state as the electrode laminate 3. In addition, the sheet-like positive electrode and negative electrode laminated via the separator form a simple rectangle slightly smaller than the basic rectangle of the separator. Therefore, the tongue piece portion 33a has an outer shape of these positive electrode and negative electrode. It is in a state of projecting outward from.

  The exterior body 2 has a first side 7 corresponding to the side of the separator where the tongue piece portion 33a is located, a second side that faces the first side 7 and from which the positive electrode tab 4 and the negative electrode tab 5 are led out. Constructed in a rectangular shape having four sides: a side 8, a third side 9 connecting the first side 7 and the second side 8 on the negative electrode tab 5 side, and a fourth side 10 serving as a liquid injection port. Has been.

  In the sealing step, the three sides 7, 8, and 9 excluding the fourth side 10 serving as the injection port are 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 form a continuous seal line by crossing each other at the end. The seal line 12 on the second side 8 is set 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 of the positive electrode tab 4 and the negative electrode tab 5. It is joined in a shape that sandwiches.

  Here, in the 1st edge | side 7 which comprises the tongue piece part 33a, the seal line 11 is comprised so that the outline of the tongue piece part 33a inside the exterior body 2 may be followed. Then, as will be described later, as the “separator fusion process”, the laminate film to be the exterior body 2 is heated so as to be pushed inward (that is, on the tongue piece portion 33a side) along the periphery of the tongue piece portion 33a. The laminate film is at least partially heat-sealed to the periphery of the tongue piece 33a.

  The sealing process of the first side 7 (“laminate film sealing process”) and the separator fusion process (“separator fusion process”) along the periphery of the tongue portion 33a will be described later. It is performed individually using a heat block for sealing or a heat block for fusing separators.

  FIG. 3 shows an example of a specific process sequence of the sealing process of the three seal lines 11, 12, and 13 and the separator fusion process along the periphery of the tongue piece 33a. In the first step (a), the sealing process of the seal line 11 along the first side 7 and the sealing process of the seal line 12 along the second side 8 are simultaneously performed. The first side 7 is sealed by using a pair of heat blocks for sealing, sandwiching two laminate films, and heating while applying pressure with a pressure and temperature suitable for joining the laminate films. Do. The second side 8 is sealed using a pair of heat blocks having a stepped processing surface in consideration of the plate thickness of the electrode tabs 4 and 5, and sandwiching two laminated films together with the electrode tabs 4 and 5. Then, heating is carried out while applying pressure with a pressure and temperature considering the heat capacity of the electrode tabs 4 and 5. In addition, the sealing process of these two sides 7 and 8 is performed in a state in which the two laminated films and the internal electrode laminate 3 are fixed by a jig (not shown) so as not to shift the positions of each other. .

  In the next step (b), the sealing process is performed on the seal line 13 along the third side 9 which is the bottom side during the injection. This is performed by using a pair of heat blocks having a shape corresponding to the seal line 13 and heating while applying pressure with a pressure and temperature suitable for joining the laminate films. Note that both end portions of the seal wire 13 extend to positions intersecting with the end portions of the seal wire 11 and the seal wire 12, whereby the exterior body 2, that is, the laminate film is configured in a bag shape. Then, simultaneously with the sealing process of the third side 9, a separator fusion process is performed on the first side 7 along the periphery of the tongue piece 33 a. In FIG. 3, the area | region where this separator melt | fusion process was made is shown with the code | symbol 16. In FIG. This separator fusion process is performed using a pair of separator fusion heat blocks that heat the laminate film while pushing the laminate film toward the separator end face of the tongue piece 33a. In FIG. 3, the separator fusion processing region 16 is illustrated so as to overlap the seal line 11. However, in the separator fusion processing, two laminate films are basically heat-sealed. Does not go. The sealing process of the third side 9 and the separator fusion process in the step (b) may cause the two laminated films and the internal electrode laminate 3 to be displaced from each other in the same manner as in the step (a). It is performed in a state of being fixed by a jig (not shown) so as not to be present.

  FIG. 4 is an explanatory view of the sealing process of the seal line 11 along the first side 7 in the step (a) (that is, the “laminate film sealing step”), in a cross section crossing the tongue piece portion 33a. The cell 1 and the heat block 21 for sealing are shown along. As described above, the electrode laminate 3 has a configuration in which the sheet-like positive electrode 31 and the negative electrode 32 are laminated via the separator 33, but these are schematically shown in FIG. A tongue piece 33a partially protruding on one side of the separator 33 protrudes outward from the outer shape of the positive electrode 31 and the negative electrode 32 as shown in the figure.

  The pair of sealing heat blocks 21 arranged so as to sandwich the two laminated films 35 to be the exterior body 2 basically have a symmetrical shape, and as shown in FIG. 7 has a main processing surface 21a continuous over the entire length of 7 and an auxiliary processing surface 21b for pushing the laminate film 35 inwardly along the edge of the tongue piece portion 33a. The auxiliary processing surface 21b is provided only in the central portion of the sealing heat block 21 having an elongated rod shape, corresponding to the tongue piece portion 33a, and has a substantially L-shaped cross section as shown in FIG. doing. In particular, the processing surface along the pressing direction in the auxiliary processing surface 21b having a substantially L-shaped cross-sectional shape is slightly inclined with respect to the pressing direction as shown in FIG. It is comprised so that the component force along the horizontal direction of FIG. 4 may arise with the applied pressure along an up-down direction. With this component force, the laminate film 35 rising along the tongue piece 33a is pressed inward. The sealing heat block 21 is made of a metal material, and an electric heater for heating (not shown) is built therein.

  In the laminate film sealing step, two laminate films 35 are sandwiched between the pair of sealing heat blocks 21 and heated to, for example, about 200 ° C. while applying pressure as indicated by arrows. Thereby, the seal line 11 is formed along the main processing surface 21a, and the two laminate films 35 are fused to each other. At the same time, the auxiliary processing surface 21b having an L-shaped cross section heats the laminate film 35 while pushing the laminate film 35 toward the inside of the cell 1 along the edge of the tongue piece 33a. Thereby, the heat sealing | fusion layer of the laminate film 35 is pressed against the end surface of the tongue piece part 33a, and there exists a possibility that it may fuse | melt partially to the synthetic resin layer of the separator 33 so that it may mention later. Note that the main purpose of the laminate film sealing step is sealing along the seal line 11, and in the present invention, the auxiliary processing surface 21b is not necessarily essential.

  Here, since the laminate film 35 which becomes the exterior body 2 has flexibility, it is possible to process the seal wires 11, 12, 13 even with a flat sheet, but at the four corners and around the tongue piece portion 33 a. In order to suppress the generation of wrinkles, the peripheral edge portion of the laminate film 35 may be previously cup-formed corresponding to the thickness of the electrode laminate 3.

  FIG. 5 is an explanatory diagram of separator fusion processing along the periphery of the tongue piece portion 33a in the step (b) of FIG. 3, and the cell 1 and the separator fusion heat block along the cross section that also crosses the tongue piece portion 33a. 22 etc. are shown.

  The pair of separator fusion heat blocks 22 arranged so as to sandwich the two laminated films 35 basically have a symmetrical shape, and as shown in FIG. It is configured as a corresponding small heat block. This separator fusion heat block 22 has a processing surface 22a having a substantially L-shaped cross section so as to push the laminate film 35 inwardly along the edge of the tongue piece 33a. More specifically, the processing surface 22a includes a first processing surface 22a1 orthogonal to the pressing direction indicated by an arrow in FIG. 5 and a second processing surface 22a2 extending substantially parallel to the pressing direction. It has a substantially L-shaped cross section so as to press the laminate film 35 along the end face of the bundle of tongue pieces 33a that are laminated in plural. As shown in FIG. 5, the second processed surface 22a2 is slightly inclined with respect to the pressurizing direction, and a component force along the horizontal direction in FIG. 4 is generated by the applied pressure along the vertical direction in FIG. It is configured as follows. With this component force, the laminate film 35 rising along the tongue piece 33a is pressed inward. Here, the second processed surface 22a2 is a processed surface along the pressing direction of the auxiliary processed surface 21b of the sealing heat block 21 in the laminate film sealing step (in other words, a processed surface corresponding to the second processed surface 22a2). ) Slightly inside the cell 1. That is, the laminate film 35 pushed into the L-shaped section along the periphery of the tongue piece 33 a by the auxiliary machining surface 21 b of the sealing heat block 21 is further pushed into the cell 1 by the second machining surface 22 a 2. It has become. The separator fusion heat block 22 is also made of a metal material, and an electric heater for heating (not shown) is incorporated therein.

  In the separator fusion process, the laminate film 35 is pressurized and heated again along the periphery of the tongue piece 33a by the pair of separator fusion heat blocks 22. However, since the two laminated films 35 are not pressed and fused here, the applied pressure is relatively low. The heating temperature is about the same as in the laminate film sealing step, and is about 200 ° C., for example. The processed surface 22a having a substantially L-shaped cross section heats the laminate film 35 while pushing the laminate film 35 into the cell 1 along the edge of the tongue piece 33a. As a result, the heat-sealing layer of the laminate film 35 is at least partially fused to the synthetic resin layer on the end face of the tongue piece portion 33a.

  FIG. 8 is an explanatory view schematically showing a fused state between the laminate film 35 and the separator 33 in the tongue piece portion 33a. As described above, the laminate film 35 is formed by laminating the heat-sealing layer 42 made of polypropylene on the inner side of the aluminum foil 41 and laminating the polyamide resin layer 43 and the polyethylene terephthalate resin layer 44 on the outer side as protective layers. It has a layer structure. The separator 33 includes ceramic layers 52 on both surfaces of a synthetic resin layer 51 made of polypropylene.

  As shown in FIG. 8, the separator 33 is exposed at the end surface cut by a cutter or the like without the synthetic resin layer 51 being covered with the ceramic layer 52. Accordingly, in the separator fusion step, the laminate film 35 is heated while being pushed toward the end face of the tongue piece portion 33a by the separator fusion heat block 22, so that the thermal fusion layer 42 of the laminate film 35 and the synthetic resin layer of the separator 33 are heated. The end face of 51 can be fused. Thereby, the electrode laminated body 3 can be fixed so as not to move inside the exterior body 2. The thermal fusion between the laminate film 35 and the separator 33 does not necessarily have to be ensured over the entire length of the edge of the tongue piece portion 33a. Further, even if a few separators 33 that are not fused to the laminate film 35 are present among the plurality of separators 33 that constitute the electrode laminate 3, there is no problem.

  Particularly in the above embodiment, even in the laminate film sealing step, the heat-bonding of the laminate film 35 and the end face of the separator 33 is obtained to some extent by the auxiliary processing surface 21b of the sealing heat block 21, and further, the separator fusion step Since the laminate film 35 is more reliably fused to the separator 33, the electrode laminate 3 can be securely fixed. Further, in the separator fusion process, not only the entire first side 7 but only the periphery of the tongue piece portion 33a is locally heated and processed, so that the pushing and fusion to the end face of the separator 33 are ensured.

  As mentioned above, although one Example of this invention was described in detail, this invention is not limited to the said Example, A various change is possible.

  For example, in the above embodiment, the laminate film sealing step (FIG. 4) is performed first, and then the separator fusion step (FIG. 5) is performed. However, the order of both can be reversed. That is, it is possible to bond the two laminate films 35 together after at least partially fusing the heat fusion layer of the laminate film 35 to the end face of the separator 33 by the separator fusion step.

  4 and 5, the tongue pieces 33 a are provided on all the plurality of separators 33, but the tongue pieces 33 a are provided on a part of the separators 33. It may be. For example, in the electrode laminate 3 including a plurality of separators 33, the separators 33 having the tongue pieces 33a and the separators 33 not having the tongue pieces 33a can be alternately arranged. Even in such a configuration, the entire electrode laminate 3 is sufficiently fixed in a state where the tongue piece portion 33 a is fused to the laminate film 35.

  Furthermore, it is also possible to fuse the end face of the separator 33 and the laminate film 35 on at least one side of the rectangular separator 33 without forming the tongue piece portion 33a on the separator 33. Since the separator 33 is formed slightly larger than the positive electrode 31 and the negative electrode 32, each side of the separator 33 protrudes slightly outward from the peripheral edge of the positive electrode 31 and the negative electrode 32 in the state of being stacked as the electrode laminate 3. . Therefore, the laminate film 35 can be fused to the end surface of the synthetic resin layer 51 of the separator 33 by appropriately performing the separator fusing step, as in the above embodiment.

DESCRIPTION OF SYMBOLS 1 ... Film exterior battery 2 ... Exterior body 3 ... Electrode laminated body 4,5 ... Electrode tab 11, 12, 13 ... Seal wire 21 ... Heat block 21a ... Main process surface 21b ... Auxiliary process surface 22 ... Separator fusion | fusion Heat block 22a ... Processing surface 33 ... Separator 33a ... Tongue piece 35 ... Laminate film 42 ... Thermal fusion layer 51 ... Synthetic resin layer 52 ... Ceramic layer

Claims (10)

A film exterior in which an electrode laminate in which a plurality of positive electrodes and negative electrodes are laminated via a separator having a ceramic layer on at least one surface is housed in an exterior body made of a laminate film having a thermal fusion layer A battery manufacturing method comprising:
Laminating film sealing step of heat sealing two laminated films with a sealing heat block on one side of the outer package corresponding to one side of the separator;
On the same side of the outer package, the separator film is heated by pressing the laminate film inward along the edge of the electrode laminate with the heat block for fusion bonding of the separator, thereby fusing the heat fusion layer of the laminate film to the separator end face. Process,
A method for producing a film-clad battery comprising:   The manufacturing method of the film-clad battery of Claim 1 which performs the said separator melt | fusion process after performing the said laminate film sealing process.   3. The film-clad battery according to claim 1, wherein the separator fusion heat block is provided with a processed surface having a substantially L-shaped cross section so as to press the laminate film along an end face of a bundle of separators stacked in a plurality. Manufacturing method.   The sealing heat block has a processed surface continuous over the entire length of one side of the exterior body so as to sandwich the two laminated films, and pushes the laminated film inward along the edge of the electrode laminate. The manufacturing method of the film-clad battery in any one of Claims 1-3 provided with the auxiliary process surface of a shape.   The said separator is a manufacturing method of the film-clad battery in any one of Claims 1-4 provided with a ceramic layer on both surfaces of a synthetic resin layer. At least a part of the separators of the plurality of separators has a tongue portion that partially protrudes on the one side,
In the said separator fusion | fusion process, the said separator fusion heat block manufactures the film-clad battery in any one of Claims 1-5 heated while pushing a laminated film inside along the circumference | surroundings of the said tongue piece part. Method.   The manufacturing method of the film-clad battery of Claim 6 by which the separator which has a tongue piece part, and the separator which does not comprise a tongue piece part are arrange | positioned alternately in the electrode laminated body containing a some separator.   The manufacturing method of the film-clad battery in any one of Claims 1-7 with which the peripheral part of the laminate film along the circumference | surroundings of the said electrode laminated body is previously cup-formed corresponding to the thickness of the said electrode laminated body. The laminate film sealing step on the one side of the exterior body and the heat sealing on the second side of the exterior body located on the opposite side of the one side are performed simultaneously,
Next, the manufacturing method of the film-clad battery in any one of Claims 1-8 which performs the heat sealing in the 3rd edge | side of an exterior body, and the said separator melt | fusion process simultaneously. An electrode laminate in which a plurality of positive and negative electrodes are laminated via a separator having a ceramic layer on at least one surface;
It is configured by heat-sealing the periphery of a laminate film provided with a heat-sealing layer, and an exterior body containing the electrode laminate,
A film-clad battery comprising:
A film-clad battery in which, on at least one side of the outer package, the end face of the separator and the heat fusion layer of the outer package adjacent to the end face of the separator are at least partially fused.

Images