JP2006079909A - Power storage module and manufacturing method of the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a film envelope type power storage module realizing space saving without lowering strength of a film envelope. <P>SOLUTION: The power storage module has a plurality of power storage units 4a, 4b, 4c, 4d sealed between adhering faces 1a of sealing films 1 superposed, arrayed in tandem-shape with a gap between each. A plurality of concave parts 2a, 2b, 2c, 2d formed for storing the plurality of power storage units respectively, concave in side view from adhesion face side, are formed on the sealing film. The plurality of concave parts are arranged in zigzag-form along the arraying direction thereof, in a view of both adhering faces spread in one plane by peeling the sealing films superposed so as to expose the plurality of power storage units. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a film exterior type power storage module in which a plurality of power storage units are sealed with a sealing film, and a method for manufacturing the same.

  From the viewpoint of cost reduction and weight reduction by reducing the number of parts, a power storage device (typically a battery) using a sealing film such as a so-called laminate film as an exterior body is used. In such a film exterior type power storage device, a power storage unit having a predetermined shape and capacity (for example, a cell constituting a secondary battery) is arranged on the adhesive surface side of the sealing film, and overlapped so as to cover the power storage unit. The films are manufactured by bonding them together by means such as heating or ultrasonic waves. For example, in Patent Document 1, a nylon layer (protective layer) constituting the outer surface of a film, an aluminum foil layer (barrier layer that blocks gas and moisture) constituting a core material, and a heat-fusible resin constituting an adhesive surface A polymer electrolyte battery constructed by using a three-layer laminated film composed of a layer (adhesive layer) as an outer package is described.

As one form of such a film exterior type power storage device, a recess for accommodating a power storage unit in advance by means of drawing or the like in a part of the exterior film such as a laminate film (when viewed from the film bonding surface side housing the power storage unit) The same shall apply hereinafter). By forming such a recess, a relatively large storage unit housing space can be formed between the sealing (exterior) films. For this reason, the capacity | capacitance improvement of an electrical storage unit can be aimed at. Moreover, the formation of the recesses facilitates the work of assembling the power storage unit to the exterior film, and can improve battery production efficiency.
In particular, such a recess is formed when it is intended to efficiently manufacture a film-clad power storage device (hereinafter referred to as “power storage module”) of a type in which a plurality of power storage units are stored and arranged in tandem between one exterior film. The merit to form on a film is great. For example, in Patent Document 2 and Patent Document 3, a plurality of recesses are formed side by side on a three-layer laminate film as described in Patent Document 1, and a power storage unit (battery structure or cell) is disposed in each recess. A film exterior type power storage module is described.

JP 2001-126709 A JP 2004-55153 A JP 2004-71302 A

By the way, when a plurality of recesses are formed in one exterior film by drawing or the like as described above, it is necessary to secure a space between the recesses to some extent. Regardless of the processing method, when a recess is formed on a part of a flat film, stress is generally applied to the film in the depth (thickness) direction. For this reason, when the space | interval of an adjacent recessed part and a recessed part is narrowed too much, there exists a possibility that the film strength of the said part (namely, part between a recessed part and a recessed part) may fall too much.
On the other hand, there is a demand for mounting a high-output power storage module on automobiles and various electric products with as little space as possible. To that end, the space (interval) between the recesses in the power storage module must be as small (narrow) as possible. desired.

  The present invention was created to satisfy such a requirement, and the space (interval) between the recesses is reduced without reducing the strength of the exterior film, and the space-saving film exterior type power storage is realized. It aims at providing a module and its manufacturing method.

  One power storage module provided by the present invention is a power storage module sealed in a state where a plurality of power storage units are separated from each other and arranged in tandem between the adhesive surfaces of the stacked sealing films. In the sealing film, a plurality of recesses are formed to accommodate the power storage units as viewed from the bonding surface side. The plurality of recesses are viewed when the stacked sealing films are peeled from each other so that the plurality of power storage units are exposed, and both adhesive surfaces are spread on one plane (specifying the invention) Therefore, it means a virtual unfolded state, whether it can be actually peeled off or not, the same applies hereinafter), and scattered in a zigzag manner along the arrangement direction of the plurality of power storage units. It is characterized by.

In the power storage module disclosed herein, in the film constituting the outer package of the module, a plurality of concave portions (that is, the power storage unit storage portions) are zigzag along the arrangement direction when viewed in the virtual unfolded state. Is formed. In other words, in order to arrange a plurality of power storage units in tandem (in a single row), compared to the case where a number of recesses corresponding to these units are simply provided in tandem (in a single row) along the power storage unit arrangement direction, The actual space on the film between the two recesses respectively storing two adjacent power storage units (that is, the space on the film plane when the sealing film is virtually developed as described above) is made wider by zigzag formation. Can be secured.
As a result, the distance between the two adjacent power storage units, that is, the distance between the two recesses respectively storing the power storage units (interval in the actual power storage module) is reduced without reducing the strength of the film existing between the recesses. be able to.
Therefore, according to the present invention, a space (interval) between adjacent recesses can be reduced, and as a result, a power storage module in which the size of the plurality of power storage units in the tandem arrangement direction is more compact than before can be provided. .

The present invention also provides a method for manufacturing the power storage module disclosed herein. That is, the manufacturing method of the present invention is a method for manufacturing a power storage module that is sealed in a state where a plurality of power storage units are spaced apart from each other and arranged in tandem between the adhesive surfaces of the stacked sealing films.
In the method disclosed herein, the plurality of power storage units are mutually attached to the adhesive surface side of the sealing film in which a plurality of recesses are formed to accommodate the power storage units, respectively, as viewed from the adhesive surface side. The step of arranging in a state of being separated and arranged in tandem, and the adhesive surfaces of the sealing film in a state in which the plurality of power storage units are arranged are overlapped, and the plurality of power storage units are placed in the corresponding recesses A step of sealing between the adhesive surfaces of the film while being accommodated. And in this method, when the sealing film to be used is viewed in a state where the two adhesive surfaces to be overlapped are spread on one plane, the plurality of power storage units arranged on the adhesive surface are arranged in the arrangement direction. The plurality of recesses are formed in a zigzag manner.
According to the method having such a configuration, the above-described compact power storage module according to the present invention can be manufactured.

  In one preferable power storage module disclosed herein, the recesses are alternately formed on one surface side and the other surface side of the stacked sealing films along the arrangement direction of the plurality of power storage units. It is characterized by being. According to this configuration, it is possible to provide a space-saving power storage module in which the space between adjacent recesses on the film is sufficiently secured and the size of the plurality of power storage units in the tandem arrangement direction is reduced.

In a particularly preferable aspect of the power storage module having such a configuration, as the sealing film, the plurality of recesses are formed in a zigzag manner along the arrangement direction of the plurality of power storage units on the adhesive surface. And it is characterized by comprising one film which is folded back at a predetermined portion and is bonded to both opposing adhesive surfaces. The power storage module of this aspect can be efficiently manufactured using one sealing film having the above-described configuration. That is, the power storage module of this aspect uses the above-mentioned single film, folds the film to be used at a predetermined position, and bonds the opposing adhesive surfaces between the film adhesive surfaces of the plurality of electrical storage units. It can manufacture by sealing. In this case, by providing a crease in the film, it is possible to prevent displacement of the adhesive surface that is likely to occur during sealing, and the sealing process can be further simplified.
Preferably, the one sealing film has at least a high melting point resin layer constituting the outer surface of the power storage module and a low melting point resin layer (thermal adhesive resin layer) constituting the adhesive surface.

  In another preferred embodiment of the power storage module disclosed herein, the plurality of power storage units are battery structures (cells) each including a positive electrode and a negative electrode, and the plurality of battery structures are It is electrically connected in series along the arrangement direction. The power storage module having such a configuration can be a compact and high power storage module.

  Hereinafter, preferred embodiments of the present invention will be described in detail. It should be noted that the technical matters other than the contents specifically mentioned in the present specification (for example, the positions where the recesses are formed) and the matters necessary for carrying out the present invention (for example, the contents of the power storage unit, for sealing such as a laminate film) The means for adhering the film) can be understood as a matter of design by those skilled in the art based on the prior art. The present invention can be carried out based on the technical contents disclosed in the present specification and the common general technical knowledge in the field.

The power storage module of the present invention is a film-clad power storage module, and there are no particular restrictions on the contents of other components and manufacturing processes as long as they have the characteristics of the present invention described above.
For example, as the sealing film, a film that constitutes an outer package of this type of power storage module (for example, a film-clad battery) and can form an appropriate recess can be used without particular limitation. For example, a laminate film that is conventionally used as an outer package of a lithium secondary battery or the like can be used.
Preferably, it is composed of an outer surface (protective) layer composed of a high melting point resin (for example, polyethylene terephthalate (PET), polytetrafluoroethylene (PTFE), polyamide (PA) resin) and a metal foil (for example, aluminum, steel). A laminate film having a three-layer structure comprising a barrier layer and an adhesive layer composed of a heat-fusible resin (a resin having a relatively low melting point, such as ethylene vinyl acetate, or an olefin resin such as polyethylene or polypropylene). It can be used suitably. Such a three-layer laminated film can be easily bonded (fused) to each other by using an appropriate thermocompression bonding means (for example, a heat press). In addition, this type of laminated film can easily form recesses by drawing or other general processing (typically pressing). It should be noted that the press working method itself such as drawing may be applied as it is, and does not characterize the present invention. Typically, a drawing process or the like may be performed so that concave portions adapted to a shape capable of accommodating the power storage unit when viewed from the bonding surface side are scattered in a zigzag manner along a predetermined direction.

  The power storage unit mounted on the power storage module disclosed herein is not particularly limited as long as it is a power storage element that can store and release predetermined power. Typical power storage units include various forms of primary batteries (eg, lithium primary batteries), secondary batteries (eg, lithium secondary batteries, nickel metal hydride batteries), or capacitors (eg, electric double layer capacitors). . Moreover, there is no restriction | limiting in particular about the individual shape and size of the electrical storage unit mounted in an electrical storage module, and it can take a suitable form and / or size according to the form and use of the film for sealing. For example, a battery structure (cell) formed by winding or stacking a sheet-shaped positive electrode and negative electrode together with a separator as used in a lithium secondary battery or the like is a power storage unit constituting the power storage module disclosed herein This is a typical example.

  The power storage module disclosed herein can include various additional components depending on the content of the power storage unit. For example, when a plurality of battery structures (for example, lithium secondary batteries) are employed as the power storage unit, they can have electrolytes of various properties (typically housed in the recesses together with the battery structure as an electrolytic solution). . In addition, a lead wire, a tab terminal, or the like for electrical connection between each power storage unit and an external circuit or electrical connection between the power storage units may be provided. The presence / absence of these additional components and their properties may be the same as those of the conventional film-clad power storage module, and do not characterize the present invention, and thus detailed description thereof is omitted.

  Several preferred embodiments of the present invention will be described below with reference to the drawings, but the present invention is not intended to be limited to those shown in the drawings.

  First, the power storage module 10 according to the first embodiment will be described with reference to FIGS. As shown in FIG.1 and FIG.2, the electrical storage module 10 which concerns on a present Example is provided with the one laminated film 1 whose size is about 400 mm x 180 mm as a sealing film. The laminate film 1 has an outer surface (protective layer) 1b made of polyethylene terephthalate resin having a thickness of approximately 15 μm, a barrier layer (not shown) made of an aluminum foil having a thickness of approximately 50 μm, and a thickness. Is composed of an adhesive surface 1a composed of a polypropylene resin having a thickness of approximately 50 μm. Then, as shown in FIG. 1, on the side of the adhesive surface 1a of the three-layer structure laminate film 1, a concave portion having a flat bottom shape zigzag along the film longitudinal direction (that is, the extending direction of the dotted line indicated by reference numeral 3 in the figure). A total of four 2a, 2b, 2c, and 2d are formed. The volume (internal space) of these recesses 2a to 2d is set to an appropriate size for accommodating power storage units (battery structures) 4a, 4b, 4c, and 4d described later.

  As shown in FIG. 2, the power storage module 10 according to the present embodiment includes a total of four battery structures (cells) 4a, 4b, 4c, and 4d as power storage units. These battery structures 4a to 4d are wound-type battery structures prepared by laminating a positive electrode sheet (positive electrode) and a negative electrode sheet (negative electrode) (not shown) constituting a lithium secondary battery together with a separator sheet, and further winding. . As shown in the figure, these four battery structures 4a to 4d are arranged in tandem on the adhesive surface 1a of the film 1 and are electrically connected to the positive electrode or the negative electrode of each battery structure 4a to 4d. The connected terminals 8b, 8c, 8d are electrically connected in series to form a state. In addition, external positive terminals (aluminum terminals) in the entire series battery structure 4 are provided at both ends of the battery structures 4a to 4d (hereinafter abbreviated as “series battery structure 4”) electrically connected in series. 8a and an external negative electrode terminal (copper terminal) 8e. Although not shown, the connection terminals 8b, 8c, and 8d are welded to an aluminum terminal connected to the positive electrode of each battery structure 4a to 4d and a copper terminal connected to the negative electrode of each battery structure 4a to 4d. It is an integrated member. That is, the positive electrode side (approximately half of the longitudinal direction of the terminal) of each connecting terminal 8b, 8c, 8d is composed of aluminum, and the negative electrode side (approximately half of the longitudinal direction of the terminal) is composed of copper.

In addition, the positive electrode sheet which concerns on a present Example is formed by providing the positive electrode active material layer for lithium secondary batteries on the elongate positive electrode collector. A metal foil such as an aluminum foil is preferably used for the positive electrode current collector. As the positive electrode active material, one kind or two or more kinds of substances conventionally used in lithium secondary batteries can be used without any particular limitation. Preferable examples include LiMn ₂ O ₄ , LiCoO ₂ , LiNiO _{2 and the} like.
On the other hand, the negative electrode sheet according to this example is formed by applying a negative electrode active material layer for a lithium secondary battery on a long negative electrode current collector. A metal foil such as a copper foil is preferably used for the negative electrode current collector. As the negative electrode active material, one or two or more kinds of materials conventionally used in lithium secondary batteries can be used without any particular limitation. Preferable examples include carbon-based materials such as graphite carbon and amorphous carbon, lithium-containing transition metal oxides and transition metal nitrides. Moreover, what was comprised with the porous olefin resin as a suitable separator sheet used between positive electrode sheets is mentioned.

The power storage module 10 according to this embodiment having the above configuration can be typically manufactured as follows. That is, as shown in FIG. 2, the series battery structure 4 is arranged along the film longitudinal direction. At this time, the external positive electrode terminal 8a and the external negative electrode terminal 8e protrude from the end of the film 1 so as to be exposed to the outside, and the positions of the storage units 4a to 4d corresponding to the positions of the recesses 2a to 2d are aligned. Then, the series battery structure 4 is arranged on the film bonding surface 1a.
Then, the half surface of the film 1 is folded back to the adhesive surface 1a side so that the laminate film 1 is divided into two in the longitudinal direction (that is, along the illustrated crease line 3). As a result, as shown in FIGS. 3 and 4, the adhesive surfaces 1 a of the film 1 are overlapped in a state in which the individual power storage units 4 a to 4 d are fitted (accommodated) in the corresponding recesses 2 a to 2 d. be able to.
Next, the bonding surfaces 1a are heat-sealed by a general heating means (for example, a heat press machine). Accordingly, the plurality of power storage units 4a to 4d (that is, the series battery structure 4) arranged in tandem are sealed between the films 1 in a state of being accommodated in the recesses 2a to 2d. Further, since the thicknesses of the connecting terminals 8b, 8c, 8d made of metal foil are substantially negligible, the connecting terminals 8b, 8c, 8d can be sealed between the bonded adhesive surfaces 1a.

In this embodiment, the adhesive surfaces 1a other than the portion are first heat-sealed while securing an electrolyte injection path (not shown) communicating from the outer edge of the film 1 to the recesses 2a to 2d. And predetermined electrolyte for lithium secondary batteries is inject | poured in each recessed part 2a-2d from the opening part (namely, injection port) of the electrolyte injection path which is provided in the outer edge of the film 1 (not shown). After the injection of the electrolyte, the electrolyte injection path is closed by thermal fusion or the like, thereby completing the sealing (sealing) of each power storage unit (battery structure) and the electrolyte. The formation of the electrolyte injection path and the electrolyte injection process may be the same as those performed in the production of a conventional film-covered lithium secondary battery, and do not characterize the present invention.
The electrolyte injected here can be used without particular limitation as long as it is conventionally used as an electrolyte for lithium secondary batteries, and does not characterize the present invention. A polymer electrolyte that is typically liquid (eg, non-aqueous electrolyte) or typically gel is used. For example, a nonaqueous electrolytic solution in which 1 mol / L LiPF ₆ is dissolved as a lithium salt in a mixed solvent of diethyl carbonate (DEC) and ethylene carbonate (EC) (for example, a mixed solvent in which DEC: EC is a mass ratio of 7: 3). Can be preferably used.

  3 and FIG. 4, the polyethylene terephthalate resin protective layer 1 b of the three-layer structure laminate film 1 is used as the outer surface, and the electricity storage unit (battery structure) 4 a is formed inside (recessed) through the above steps. A power storage module (here, a film-covered lithium secondary battery) 10 in which ˜4d is sealed can be manufactured. In addition, as shown in FIG. 4, as one of the external features of the power storage module 10 according to the present embodiment, the back side (rear surface) of the recesses (power storage unit storage portions) 2a to d when viewed from the adhesive surface 1a side. It can be mentioned that the convex portions 7 corresponding to 1 appear alternately on one surface side and the other surface side of the outer surface 1b of the sealing laminate film 1.

In the power storage module 10 according to the present embodiment having the above-described configuration, the recesses 2a to 2d are arranged in a zigzag manner along the tandem arrangement direction of the power storage units 4a to 4d. A relatively large space (that is, a distance indicated by reference sign d2 in FIG. 1) can be secured. For this reason, stress due to stretching in the film depth (thickness) direction when forming the recesses 2a to 2d in the film 1 by drawing or the like is relieved in the space portion, and the film strength in the portion (that is, between the recesses) Can be prevented. On the other hand, the space between the recesses in the tandem arrangement direction of the power storage units 4a to 4d after the power storage module 10 is constructed (completed) (that is, the distance indicated by the symbol d1 in FIG. 1) is within a range that does not affect the film strength. Can be made as small as possible. For this reason, the size of the power storage module 10 in the power storage unit arrangement direction (here, the longitudinal direction) can be reduced, and space saving can be realized. Moreover, as a result of reducing the size of the film by an amount that can reduce the space between the power storage units 4a to 4d, the production cost (especially the cost required for the film) can be reduced.
In this example, by folding back one sheet of the sealing laminate film 1 along the crease line 3, it is possible to prevent any easily occurring when the adhesive surfaces 1a are overlapped. For this reason, the highly efficient electrical storage module 10 can be manufactured efficiently.

Next, the power storage module 20 according to the second embodiment will be described with reference to FIGS. The power storage module 20 according to the present embodiment is a film exterior type including a total of four battery structures (cells) 4a, 4b, 4c, 4d having the same configuration as the power storage module 10 according to the first embodiment as power storage units. It is a lithium secondary battery.
Among the members constituting the power storage module 20 according to the present embodiment, the same components as those of the power storage module 10 according to the first embodiment described above are the same in the figure. Reference numerals are given, and duplicate descriptions are omitted.

  That is, as shown in FIG. 5, the three-layer structure laminate film 11 used in this example has a portion where the battery structures 4 a to 4 d (series battery structure 4) are disposed as a core 15, and the battery is formed from the core 15. A total of four overhang portions 16a, 16b, 16c, and 16d are formed in both side directions orthogonal to the tandem arrangement direction of the structures 4a to 4d. As illustrated, the overhang portions 16a to 16d are formed in a zigzag manner with the core portion 15 sandwiched in the battery structure arrangement direction. In addition, concave portions (power storage unit storage portions) 12a, 12b, 12c, and 12d having sizes suitable for storing the power storage units 4a to 4d are formed in predetermined portions of the overhang portions 16a to 16d, respectively. Yes.

With the above configuration, as shown in FIG. 5, the battery structures 4a to 4d (series battery structure 4) are arranged in tandem on the core portion 15 on the film bonding surface 11a side, and the overhang portions 16a to 16d are fold lines. The battery structures 4a to 4d are accommodated in the recesses 12a to 12d by being bent along the direction 13 toward the core 15. And each battery structure 4a-4d (namely, series battery structure 4) can be sealed between the films 11 by heat-seal | bonding the adhesion surfaces 11a around the recessed parts 12a-12d. Note that the electrolyte is injected into each of the recesses 12a to 12d before being completely sealed, as in the first embodiment.
In the electricity storage module 20 according to the present embodiment manufactured as described above, as shown in FIG. 6, it corresponds to the back side (back side) of the recesses (storage unit storage portions) 12 a to 12 d when viewed from the bonding surface 11 a side. The projecting portion 17 appears only on one surface side of the outer surface 11 b of the sealing laminate film 11.

  In the power storage module 20 according to the present embodiment having the above-described configuration, the recesses 12a to 12d are arranged in a zigzag manner along the tandem arrangement direction of the power storage units 4a to 4d as in the first embodiment. Accordingly, it is possible to ensure a relatively large space between two adjacent recesses, and to prevent a decrease in film strength at that portion. On the other hand, the space between the recesses in the tandem arrangement direction of the power storage units 4a to 4d after the power storage module 20 is constructed (completed) can be made as small as possible without affecting the film strength. For this reason, the space saving of the electrical storage unit 20 of the electrical storage module 20 is realizable.

<Test Example 1: Evaluation of recess depth limit in sealing film>
In order to confirm the superiority of the present invention, the limit depth of recesses (A (see FIG. 1): mm) and the distance between recesses (d: mm) (hereinafter “pitch”) that can be formed in a laminate film as follows. ")."
That is, using the three-layer structure laminate film used in the first example as a material, the recesses were formed in a zigzag manner along a predetermined direction (that is, the tandem arrangement direction of the power storage units) by drawing as in the above example. At this time, the pitch d (that is, the distance indicated by reference sign d1 in FIG. 1) in the predetermined direction (the storage unit arrangement direction) between the adjacent recesses is changed in a range of 0 to 15 mm, and the recess limit depth at each pitch is changed. (Mm) was examined. That is, recesses with various depths were formed in a zigzag pattern at each pitch, and the maximum recess depth at which defects such as cracks did not occur in the film portion between the recesses was defined as the recess limit depth here. In addition, as a comparative test, the same three-layer laminated film is used as a material, and the concave limit depth at each pitch when concave portions are formed in series along a predetermined direction (that is, the tandem arrangement direction of the power storage units) by drawing. Examined.
The results are shown in FIG. Plots indicated by triangles in the figure show the results of pitch and recess limit depth when the recesses are formed in a zigzag, and the plots shown by diamonds indicate the results of pitch and recess limit depth when the recesses are formed in series . As apparent from FIG. 7, it was recognized that the pitch can be remarkably narrowed without lowering the film strength by forming the recesses in a zigzag manner.

Specific examples of the present invention have been described in detail above, but these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes of the specific examples illustrated above. For example, in the above embodiment, the example in which the present invention is applied to a lithium secondary battery has been described, but the power storage module according to the present invention is not limited to a lithium secondary battery. For example, the power storage unit may be a primary battery or secondary battery (cell) other than a lithium secondary battery, or may constitute a physical battery such as an electric double layer capacitor.
The technical elements described in this specification or the drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. Moreover, the technique illustrated in this specification or the drawings achieves a plurality of objects at the same time, and has technical usefulness by achieving one of the objects.

It is a top view which shows typically the film for sealing which comprises the electrical storage module which concerns on one Example. It is a top view which shows the state which arranged the some electrical storage unit in tandem on the adhesive surface of the film for sealing which comprises the electrical storage module which concerns on one Example. It is a top view which shows typically the external appearance of the electrical storage module which concerns on one Example. It is a side view which shows typically the external appearance of the electrical storage module which concerns on one Example. It is a top view which shows the state which arranged the some electrical storage unit in tandem on the adhesive surface of the film for sealing which comprises the electrical storage module which concerns on one Example. It is a side view which shows typically the external appearance of the electrical storage module which concerns on one Example. It is a graph which shows the relationship between pitch d and recessed part limit depth A, a horizontal axis is pitch (mm), and a vertical axis | shaft is a recessed part limit depth (mm).

Explanation of symbols

1, 11 Laminating film 1a, 11a Adhesive surfaces 2a, 2b, 2c, 2d, 12a, 12b, 12c, 12d Recess 3, 13 Fold line 4 Series battery structure 4a, 4b, 4c, 4d Power storage unit (battery Structure)
10,20 Power storage module (lithium secondary battery)

Claims (5)

A storage module in which a plurality of storage units are separated from each other and arranged in tandem between the adhesive surfaces of the superimposed sealing films,
In the sealing film, a plurality of recesses as viewed from the adhesive surface side are formed to accommodate the power storage units, respectively.
Here, the plurality of recesses are formed when the stacked sealing films are peeled off from each other so that the plurality of power storage units are exposed, and the adhesive surfaces are spread on one plane. A power storage module that is scattered in a zigzag manner along the arrangement direction of the units.   The electricity storage according to claim 1, wherein the recesses are alternately formed on one surface side and the other surface side of the superimposed sealing films along the arrangement direction of the plurality of electricity storage units. module.   As the sealing film, the plurality of recesses are formed in a zigzag manner along the arrangement direction of the plurality of power storage units on the adhesive surface, and both of the facing portions are folded back at predetermined portions. The electrical storage module of Claim 1 or 2 provided with the sheet of 1 film | membrane to which the adhesive surface was adhere | attached.   The plurality of power storage units are battery structures each including a positive electrode and a negative electrode, and the plurality of battery structures are electrically connected in series along the arrangement direction. A power storage module according to claim 1. A method for manufacturing a power storage module in which a plurality of power storage units are separated from each other and arranged in tandem between the adhesive surfaces of the superimposed sealing films, the following steps:
A state in which the plurality of power storage units are separated from each other and arranged in tandem on the adhesive surface side of the sealing film in which a plurality of recesses are formed to accommodate the power storage units, respectively, as viewed from the adhesive surface side The sealing film used here is arranged along the arrangement direction of the plurality of power storage units arranged on the adhesive surface when the two adhesive surfaces to be superimposed are viewed on a single plane. The plurality of recesses are formed in a zigzag manner; and the adhesive surfaces of the sealing film in a state where the plurality of power storage units are arranged are overlapped with each other, Sealing between the adhesive surfaces of the film while accommodating each of the storage units in the corresponding recesses;
Including the method.

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