JP2015103370A - Lithium ion secondary battery and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lithium ion secondary battery which allows even a large-size lithium ion secondary battery of a simple and convenient structure to be installed and fixed firmly without making an operation during construction complicated; and a method for manufacturing such a lithium ion secondary battery.SOLUTION: A lithium ion secondary battery comprises: a film-electrode assembly 10 arranged by alternately laminating a positive electrode plate 2 and a negative electrode plate 3, which serve as electrode plates, a semisolid or solid electrolytic layer 13, and a separator 14 and providing terminal tabs 4 and 5 to protrude; and a sheet-like outer sheath 15 in which the film-electrode assembly 10 is enclosed and sealed. The outer sheath 15 includes a base material 15A; and an adhesion layer 15B provided on at least part of the base material on the side of a surface 15c.

Description

  The present invention relates to a lithium ion secondary battery and a method for manufacturing the same.

  Lithium ion secondary batteries are characterized by high energy density and electromotive force compared to lead-acid batteries and nickel metal hydride batteries. Therefore, they are widely used as power sources for various portable devices and laptop computers that require miniaturization and weight reduction. It is used. Such a lithium ion secondary battery generally constitutes an electrode plate constituting a positive electrode in which a positive electrode active material is applied to a positive electrode current collector, and a negative electrode in which a negative electrode active material is applied to the negative electrode current collector. It is manufactured by laminating an electrode plate with a separator and an electrolyte layer interposed therebetween, and sealing the laminated body in which each electrode plate, separator and electrolyte layer are laminated in an exterior body. In the lithium ion secondary battery having the above configuration, a solid, semi-solid, or liquid battery is used as the electrolyte layer. In addition, the lithium ion secondary battery is generally configured by sealing the terminal tabs connected to the electrode plates of the laminated body with the exterior body in a state of protruding from the exterior body.

  In addition, it has also been proposed to use a secondary battery obtained by sealing the laminate as described above in an exterior body, with the double-sided adhesive tape affixed to the exterior body being fixed and housed in the exterior case. (For example, see Patent Document 1). According to the secondary battery described in Patent Document 1, since the secondary battery and the outer case are integrated with the double-sided adhesive tape, it is possible to prevent the terminal tab from being displaced due to external vibration or impact, It is possible to prevent disconnection or the like from occurring.

  In addition, when combining a plurality of non-aqueous electrolyte secondary batteries obtained by sealing the laminate as described above into an outer package to form an assembled battery, the non-aqueous electrolyte absorption between each secondary battery is increased. Adhesion with the provided adhesive is proposed (see, for example, Patent Document 2). According to the non-aqueous electrolyte secondary battery described in Patent Document 2, even when the non-aqueous electrolyte leaks from the exterior body, the non-aqueous electrolyte is absorbed by the above adhesive, This prevents the deterioration of the sealing performance of the outer casing of other secondary batteries caused by the non-aqueous electrolyte and the short-circuiting of the terminal tabs and the surrounding electrical circuits, thereby minimizing the impact on the surroundings. is there.

JP-A-11-111250 JP 2008-226560 A

  By the way, in recent years, the number of cases where lithium ion secondary batteries are installed in a narrow place such as in a car or inside a wall is increasing. In order to cope with such installation / use forms and to further increase the battery capacity, the lithium ion secondary battery is configured to be thin (for example, 2 mm or less) and large in size (for example, rectangular) in plan view. In other words, it is also made flexible by making it about 1 m per side.

  On the other hand, when installing a lithium ion secondary battery in a place where it is used, for example, fixing means such as nails and fixtures have been used, but these methods require construction jigs. There is a problem that workability is poor when a lithium ion secondary battery is installed in a narrow place. For this reason, for example, a secondary battery in which a double-sided adhesive tape is applied to a means for installing the secondary battery by applying a configuration in which a double-sided adhesive tape is attached to an exterior body, such as the secondary battery described in Patent Document 1, is provided. It is also conceivable to adopt a method for fixing the secondary battery in a simple procedure by introducing and installing it at the installation location (construction location).

  However, after the double-sided adhesive tape is applied to the exterior body of the secondary battery and then the secondary battery is fixed to the installation location using the double-sided adhesive tape, the installation work becomes complicated due to the tape application work at the construction site. There is a problem. In addition, when a double-sided adhesive tape is applied to the exterior of the secondary battery and fixed to the installation location, pressure deviation occurs in the tape surface direction, and pressure deviation occurs in the electrodes in the secondary battery. There is a problem that the performance of the system deteriorates.

  In addition, for example, an adhesive having non-aqueous electrolyte absorbability such as the non-aqueous electrolyte secondary battery described in Patent Document 2 may be applied as a fixing means to the installation location of the secondary battery. However, even in such a case, there is a problem that the installation work becomes complicated due to the adhesive application work and the like at the construction site as described above.

  In addition, when attaching the secondary battery to the exterior of the secondary battery, or after fixing the secondary battery after applying the adhesive, during installation of the secondary battery, As a result, the bonding state of the secondary battery is not uniform, and the fixing strength may be reduced, or the heat dissipation of the secondary battery may be hindered.

  The present invention has been made in view of the above problems, and even when a large-sized lithium ion secondary battery is installed, the work at the time of construction is not complicated, and it is firmly installed and fixed with a simple configuration. An object of the present invention is to provide a lithium ion secondary battery that can be used, and a method for manufacturing the same.

According to a first aspect of the present invention, there is provided a membrane electrode assembly in which a separator and an electrolyte layer are interposed between a positive electrode plate and a negative electrode plate, and a terminal tab is protruded, and the membrane electrode assembly is accommodated inside. And a sheet-like exterior body that is sealed, and the exterior body is provided with an adhesive layer on at least a part of the surface side of the base material.
According to the present invention, since the adhesive layer is preliminarily provided on the surface side of the exterior body, an adhesive tape affixing operation or jig at the time of construction is unnecessary, handling becomes easy and workability is improved. Even a large lithium ion secondary battery can be reliably installed and fixed by a simple procedure.
In addition, since the lithium ion secondary battery can be fixed to the installation location by the adhesive layer provided on the exterior body, it is possible to suppress the terminal tab from being displaced due to external vibration or impact, resulting in disconnection or the like. Can be prevented.
Furthermore, when installing the lithium ion secondary battery, an equal pressure is applied between the adhesive layer and the installation location, and the lithium ion secondary battery can be fixed in a strong and stable state.

A second aspect of the present invention is the lithium ion secondary battery according to the first aspect, wherein the adhesive layer is formed of any one of a rubber resin, an acrylic resin, a silicon resin, and a urethane resin. It is characterized by.
ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to fix a lithium ion secondary battery more reliably and firmly with respect to an installation place by employ | adopting said resin for the contact bonding layer with which an exterior body is equipped.

A third aspect of the present invention is the lithium ion secondary battery according to the first or second aspect, wherein the adhesive layer has a thickness in the range of 1 to 100 μm.
According to the present invention, it is possible to secure the adhesive strength of the lithium ion secondary battery to the installation location by limiting the film thickness of the adhesive layer to the above range.

Invention of Claim 4 is a lithium ion secondary battery as described in any one of Claims 1-3, Comprising: A space | gap so that the said contact bonding layer may cover the predetermined area | region in the surface side of the said base material It is characterized by being completely formed.
According to the present invention, the adhesive layer is formed so as to cover a predetermined region on the surface side of the base material of the exterior body, so that the lithium ion secondary battery can be more firmly fixed to the installation location. It becomes.

Invention of Claim 5 is a lithium ion secondary battery as described in any one of Claims 1-3, Comprising: The said contact bonding layer is linear at planar view in the surface side of the said base material. In addition, it is formed in any one of a substantially lattice shape and a substantially dot shape.
According to the present invention, the adhesive layer has the above-described shape having a gap on the surface of the base material, so that the heat dissipation effect is also ensured while ensuring the predetermined adhesive strength of the lithium ion secondary battery to the installation location. It becomes possible.

The invention according to claim 6 is a method in which a separator and an electrolyte layer are interposed between a positive electrode plate and a negative electrode plate, and a membrane electrode assembly is formed by projecting a terminal tab, and then the membrane electrode assembly is attached to a sheet. A method for producing a lithium ion secondary battery that is housed and sealed in an outer package, comprising a step of forming an adhesive layer on at least a part of the surface side of a substrate provided in the package. Features.
According to the present invention, it is possible to manufacture a lithium ion secondary battery excellent in workability and fixing strength by forming an adhesive layer on the surface side of the exterior body.

The invention of claim 7 is the method of manufacturing a lithium ion secondary battery according to claim 6, wherein the step of forming the adhesive layer is performed in advance before the membrane electrode assembly is accommodated in the exterior body. An adhesive layer is formed on the surface side of the substrate.
According to the present invention, since the adhesive layer is formed in advance on the surface side of the exterior body, a lithium ion secondary battery excellent in workability can be manufactured.

Invention of Claim 8 is a manufacturing method of the lithium ion secondary battery of Claim 6 or Claim 7, Comprising: The process of forming the said contact bonding layer is at least one part of the surface side of the said base material, The adhesive layer is formed by applying any one of rubber resin, acrylic resin, silicon resin, and urethane resin.
According to the present invention, a lithium ion secondary battery that can be more securely and firmly fixed to an installation place by forming an adhesive layer provided in an exterior body using the above resin is manufactured. Is possible.

The invention of claim 9 is the method for producing a lithium ion secondary battery according to any one of claims 6 to 8, wherein the step of forming the adhesive layer is performed on the surface side of the substrate. The adhesive layer is formed by sticking a release paper having a layer made of an adhesive resin to at least a part thereof.
ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to manufacture efficiently the lithium ion secondary battery excellent in workability | operativity and fixed strength by forming an adhesive layer using the release paper provided with the layer which consists of adhesive resin. .

According to the lithium ion secondary battery and the manufacturing method thereof according to the present invention, the following effects can be achieved by the above-described solving means.
That is, according to the present invention, since the adhesive layer is preliminarily provided on the surface side of the exterior body, an adhesive tape affixing operation or jig at the time of construction is unnecessary, handling is easy and workability is improved. Thus, even a large lithium ion secondary battery can be reliably installed and fixed by a simple procedure.
In addition, since the lithium ion secondary battery can be fixed to the installation location by the adhesive layer provided on the exterior body, it is possible to suppress the terminal tab from being displaced due to external vibration or impact, resulting in disconnection or the like. Can be prevented.
Furthermore, when installing the lithium ion secondary battery, an equal pressure is applied between the adhesive layer and the installation location, and the lithium ion secondary battery can be fixed in a strong and stable state.
Therefore, for example, in the case of installing a large lithium ion secondary battery in the interior of a wall or ceiling in addition to a narrow installation place such as the inside of an automobile, the work at the time of construction is not complicated, There is an effect that it is possible to fix with excellent adhesive strength.

It is a figure which illustrates typically the lithium ion secondary battery which concerns on this invention, and is a perspective view which shows the lithium ion secondary battery by which a multilayer membrane electrode assembly is accommodated in the exterior body. It is a figure which illustrates the lithium ion secondary battery which concerns on this invention typically, and is sectional drawing of the lithium ion secondary battery shown in FIG. It is a figure which illustrates the lithium ion secondary battery which concerns on this invention typically, (a)-(j) is the adhesion | attachment with which the exterior body of the lithium ion secondary battery shown in FIG.1 and FIG.2 is equipped, respectively. It is the schematic which showed the various aspects at the time of planarly viewing a layer.

  Hereinafter, the configuration of a lithium ion secondary battery and an embodiment of a manufacturing method thereof according to the present invention will be described with reference to FIGS. Note that the drawings used in the following description may show the characteristic parts in an enlarged manner for the sake of convenience in order to make the characteristics easy to understand. There is. In addition, the materials, dimensions, and the like exemplified in the following description are examples, and the present invention is not limited to them, and can be appropriately changed and implemented without changing the gist thereof.

<Lithium ion secondary battery>
FIG. 1 is a perspective view showing a stacked lithium ion secondary battery 1 manufactured by the manufacturing method of one embodiment of the present invention, and FIG. 2 is a cross-sectional view of the lithium ion secondary battery 1 shown in FIG. FIG.

  As shown in FIG. 1, the lithium ion secondary battery 1 of the present embodiment includes a positive electrode plate (electrode plate) 2 and a negative electrode plate (electrode plate) 3 that are electrode plates, and a semi-solid or solid electrolyte layer 13. And a membrane electrode assembly 10 in which the terminal tabs 4 and 5 are protruded, and a sheet-like exterior body 15 that accommodates and seals the membrane electrode assembly 10 therein. In general, it is configured. And the exterior body 15 with which the lithium ion secondary battery 1 of this embodiment is equipped is a plane in the example shown in FIG. 1 (refer also sectional drawing of FIG. 2) at least one part by the side of the surface 15c of 15 A of base materials. A substantially rectangular adhesive layer 15 </ b> B is provided in the vicinity of the approximate center of the outer package 15 when viewed.

  As shown in FIG. 2, the multilayer membrane electrode assembly 10 provided in the lithium ion secondary battery 1 includes a positive electrode plate 2 and a negative electrode plate 3 stacked, and a terminal tab 4 from the end of the positive electrode plate 2. And the terminal tab 5 is projected from the end of the negative electrode plate 3. Further, in the membrane electrode assembly 10 described in the present embodiment, a semi-solid or solid electrolyte layer 13 and a separator 14 are disposed on at least one of the positive electrode plate 2 and the negative electrode plate 3, and FIG. In the example shown in FIG. 2, an electrolyte layer 13 and a separator 14 are interposed between the positive electrode plate 2 and the negative electrode plate 3.

  As shown in FIGS. 1 and 2, in the lithium ion secondary battery 1 of the present embodiment, the multilayer membrane electrode assembly 10 is packaged by an exterior body 15 made of, for example, an aluminum material, and the positive electrode plate 2. The outer peripheral portion 15a of the outer package 15 is sealed while the terminal tab 4 connected to the terminal tab 5 and the terminal tab 5 connected to the negative electrode plate 3 are projected to the outside.

  Although not shown in detail in the positive electrode plate 2, a positive electrode active material layer is formed on both sides of the current collector made of an aluminum foil formed in a substantially rectangular shape in plan view, excluding the region of the end portion 7. It has been done. Further, the end portion 7 serves as a joining margin for the terminal tab 4.

  The positive electrode active material layer is formed, for example, by applying a positive electrode slurry obtained by dispersing a positive electrode active material, a conductive additive, and a binder serving as a binder in a solvent to a current collector. For example, in the area | region pinched | interposed into the edge part 7 of a collector, it is coated on both surfaces.

The positive electrode active material is not particularly limited. For example, lithium metal oxide represented by the general formula LiM _x O _y (where M is a metal and x and y are composition ratios of metal M and oxygen O). Compounds can be used. Specifically, lithium cobaltate, lithium nickelate, lithium manganate, lithium iron phosphate and the like are used as the lithium metalate compound.
Moreover, as a conductive support agent in a positive electrode active material layer, acetylene black etc. are used, for example, and a polyvinylidene fluoride etc. are used as a binder, for example.

  The terminal tab 4 attached to the positive electrode plate 2 is provided so as to be joined to the end portion 7 of the positive electrode plate 2 and protrude outward, and is formed of, for example, an aluminum plate or the like.

  Similarly to the positive electrode plate 2, the cut-out negative electrode plate 3 is, for example, a current collector made of copper (Cu) formed in a substantially rectangular shape in plan view on both sides excluding the region of the end 11. A negative electrode active material layer is formed. Further, the end portion 11 serves as a joining margin for the terminal tab 5.

  In the example shown in FIGS. 1 and 2, the terminal tab 4 connected to the positive electrode plate 2 and the terminal tab 5 connected to the negative electrode plate 3 are the same end in the membrane electrode assembly 10, that is, It arrange | positions so that it may protrude in the same direction from the same edge part in the lithium ion secondary battery 1. FIG.

  For the negative electrode active material layer, for example, a negative electrode active material, a binder serving as a binder, and a negative electrode slurry obtained by dispersing a conductive additive added as necessary in a solvent are applied to a current collector. For example, in the region sandwiched between the end portions 11 of the current collector, it is coated on both surfaces.

The negative electrode active material is not particularly limited, and for example, a carbon material made of carbon powder or graphite powder, or a metal oxide such as lithium titanate can be used.
As the binder, for example, polyvinylidene fluoride can be used, and as the conductive auxiliary agent, for example, acetylene black, carbon nanotube, or the like can be used.

  The terminal tab 5 of the negative electrode plate 3 is provided so as to be joined to the end portion 11 of the negative electrode plate 3 so as to protrude outward, and is formed of, for example, an aluminum plate or the like plated with nickel.

The electrolyte layer 13 illustrated in FIG. 2 is formed, for example, by applying a semi-solid (gel-like) electrolyte on the plate surface of the strip-shaped negative electrode plate 3, or by laminating a solid electrolyte. Become. In the illustrated example, the electrolyte layer 13 is shown at the same position as the separator 14 for convenience.
The electrolyte layer 13 may be provided on either surface of the belt-like positive electrode plate 2 or the negative electrode plate 3, but may be provided on both plate surfaces of the positive electrode plate 2 and the negative electrode plate 3, for example. .

In the case where the electrolyte layer 13 is formed from a semi-fixed gel electrolyte, for example, it is composed of a polymer matrix and a non-aqueous electrolyte solution (that is, a non-aqueous solvent and an electrolyte salt), and is gelled to make the surface sticky The electrolyte layer 13 can be formed by applying what is produced on the electrode plate. Alternatively, as described later, it is also possible to use a gel electrolyte that is made of a polymer matrix and a non-aqueous solvent and becomes a solid electrolyte by solidifying after coating.
In the present embodiment, either a semi-fixed or fixed electrolyte may be used. However, when a semi-fixed gel electrolyte is used, the adhesive property is increased when applied to the positive electrode plate 2 or the negative electrode plate 3. It is preferable to use a material that forms a self-supporting film that does not separate from the plate surface of the positive electrode plate 2 or the negative electrode plate 3.

  Examples of the polymer matrix include polyvinylidene fluoride (PVDF), hexafluoropropylene copolymer (PVDF-HFP), polyacrylonitrile, alkylene ethers such as polyethylene oxide and polypropylene oxide, polyester, polyamine, polyphosphazene, Polysiloxane or the like can be used.

  Examples of the non-aqueous solvent include lactone compounds such as γ-butyrolactone; carbonate ester compounds such as ethylene carbonate, propylene carbonate, dimethyl carbonate, diethyl carbonate, and methyl ethyl carbonate; carboxylic acids such as methyl formate, methyl acetate, and methyl propionate. Ester compounds; ether compounds such as tetrahydrofuran and dimethoxyethane; ether compounds such as tetrahydrofuran and dimethoxyethane; nitrile compounds such as acetonitrile; sulfone compounds such as sulfolane; amide compounds such as dimethylformamide; Can be used.

It is also possible to solidify the gel electrolyte after coating to form a solid electrolyte layer. In this case, as the gel electrolyte, for example, a nitrile compound such as acetonitrile; an ether compound such as tetrahydrofuran : A compound prepared by mixing amide compounds such as dimethylformamide alone or in combination of two or more thereof can be used.
The electrolyte salt is not particularly limited, and lithium salts such as lithium hexafluorophosphate, lithium perchlorate, and lithium tetrafluoroborate can be used.

  The material of the separator 14 is not particularly limited. For example, a material made of olefin-based polyethylene, polypropylene, or cellulose-based material can be used. And the nonwoven fabric etc. which consist of these materials can be employ | adopted for the separator 14. FIG.

As shown in FIGS. 1 and 2, the outer package 15 includes a base material 15A made of a sheet-like metal material and an adhesive layer 15B provided on at least a part of the surface 15c side of the base material 15A. .
As the base material 15A of the exterior body 15, for example, a known material conventionally used in this field, such as a flexible laminate resin film, an aluminum material, and a stainless steel material, can be used.
Moreover, the exterior body 15 is formed in the magnitude | size which can accommodate and seal the membrane electrode assembly 10, as shown in FIG.1 and FIG.2. And the outer peripheral part 15a of the exterior body 15 other than the area | region where the membrane electrode assembly 10 is arrange | positioned along the peripheral part of the membrane electrode assembly 10 is sealed.

  In the lithium ion secondary battery 1 of the present embodiment, the adhesive layer 15B provided on the exterior body 15 and formed on the surface 15c side of the base material 15A is composed of a resin material having adhesiveness. The adhesive layer 15B adheres between the adhesive layer 15B and an installation location such as various walls when the lithium ion secondary battery 1 is fixed to the installation location.

  According to the lithium ion secondary battery 1 of the present embodiment, the adhesive layer 15B is provided on the surface 15c side of the exterior body 15 in advance, so that an adhesive tape is applied at the time of battery installation at the installation location. Since it is not necessary to attach or use a jig or the like, handling is facilitated and workability is improved. Therefore, even when the large-sized lithium ion secondary battery 1 is attached, it can be reliably installed and fixed by a simple procedure. Further, since the lithium ion secondary battery 1 can be fixed to the place where the battery is installed by the adhesive layer 15B, it is possible to prevent the terminal tabs 4 and 5 from being displaced due to external vibration or impact, and disconnection or the like can be caused. It can be prevented from occurring. Furthermore, when the lithium ion secondary battery 1 is fixed to the installation location, an equal pressure is applied between the adhesive layer 15B and the installation location such as a wall, so that the lithium ion secondary battery 1 is adhered and fixed in a strong and stable state. It becomes possible.

  The material of the adhesive layer 15B provided on the outer package 15 is not particularly limited as long as it is an adhesive material, but for example, formed from any of rubber-based resin, acrylic-based resin, silicon-based resin, and urethane-based resin. It is preferable to be made. In this case, examples of the rubber resin include natural rubber materials, examples of the acrylic resin include acrylic acid ester copolymers, and examples of the silicon resin include silicon rubber. By adopting the above adhesive resin material for the adhesive layer 15B, the lithium ion secondary battery 1 can be more securely and firmly fixed to an installation place such as a wall.

Further, the film thickness of the adhesive layer 15B is not particularly limited, but it is preferable to form the adhesive layer 15B with the film thickness in the range of 1 to 100 μm, for example. When the film thickness of the adhesive layer 15B is within this range, the adhesive strength of the lithium ion secondary battery 1 to the installation location such as a wall can be ensured.
If the film thickness of the adhesive layer is less than 1 μm, high adhesive strength cannot be obtained, and the fixing strength to the installation location of the lithium ion secondary battery may be reduced. On the other hand, if the thickness of the adhesive layer exceeds 100 μm, the adhesive layer becomes too thick and uneconomical, and conversely, the adhesive strength may decrease.

  Further, for example, as illustrated in FIG. 3A, the adhesive layer 15B is formed without a gap so that a predetermined region on the surface 15c side of the base material 15A is covered with the above-described adhesive material made of resin. Can be adopted. Since the adhesion area is increased by forming the adhesion layer 15B at least in a predetermined region without any gap, the lithium ion secondary battery 1 can be more firmly fixed to an installation place such as a wall.

On the other hand, the exterior body 15 used in the present embodiment forms an adhesive layer provided on the base material 15A in, for example, any one of a substantially linear shape, a substantially lattice shape, and a substantially dot shape in plan view. May be.
The adhesive layer 15C in the example shown in FIG. 3B is formed of a plurality of oblique lines on the drawing by applying an adhesive material in a linear shape.
In addition, the adhesive layer 15D in the example illustrated in FIG. 3C is formed in a shape having a substantially rhombic gap in a plan view when the adhesive material is applied in a substantially lattice shape.
In addition, the adhesive layer 15E in the example shown in FIG. 3 (d) is formed of a plurality of vertically long lines having gaps between each other in this drawing by applying an adhesive material in a linear shape. Yes.
Further, the adhesive layer 15F in the example shown in FIG. 3E is formed in a shape having a substantially rectangular gap in plan view by applying the adhesive material in a substantially lattice shape.

Further, the adhesive layer 15G in the example shown in FIG. 3 (f) is aligned in the vertical and horizontal directions in this drawing by applying a plurality of adhesive materials in a substantially dot shape, in the illustrated example in a circular shape in plan view. Are arranged as follows.
3 (g) is different from the adhesive layer 15I in the example shown in FIG. 3 (f) in that a plurality of adhesive materials are applied in a substantially dot shape, Are alternately arranged in the vertical and horizontal directions.
Further, the adhesive layer 15I of the example shown in FIG. 3 (h) is aligned in the vertical and horizontal directions in the drawing by applying a plurality of adhesive materials in a substantially dot shape, in the illustrated example, in a triangular shape in plan view. Is arranged.
Further, the adhesive layer 15J in the example shown in FIG. 3 (i) is aligned in the vertical and horizontal directions in the drawing by applying a plurality of adhesive materials in a substantially dot shape, in the illustrated example, in a substantially donut shape in plan view. Are arranged as follows.

  As in the example shown in FIGS. 3B to 3J, the adhesive material forming the adhesive layer has a shape having a gap on the surface of the base material, so that the lithium ion secondary battery 1 and the wall are A gap is secured between the installation location. Thereby, while ensuring the predetermined adhesive strength of the lithium ion secondary battery 1 with respect to an installation place, the heat dissipation effect of the battery which generates heat can be secured at the same time.

  In addition, the dimension and area in planar view of the contact bonding layer 15B on the base material 15A are not specifically limited, It can set suitably. In the example shown in FIG. 2 (see also FIG. 1), the size and area of the adhesive layer 15B are approximately the same as those of the positive electrode plate 2 and the negative electrode plate 3 in plan view. Can be appropriately selected within a range of an area that covers the entire base material 15 </ b> A from about half the area of the positive electrode plate 2 and the negative electrode plate 3.

<Method for producing lithium ion secondary battery>
Next, the manufacturing method of the lithium ion secondary battery 1 according to the embodiment of the present invention will be described with reference to FIGS.
In the manufacturing method of this embodiment, when manufacturing the lithium ion secondary battery 1 as shown in FIGS. The process of forming is provided.

In addition, the manufacturing method described in the present embodiment includes at least the following steps (1) and (2).
(1) The positive electrode plate 2 and the negative electrode plate 3 which are electrode plates are laminated by interposing a semi-solid or solid electrolyte layer 13 and a separator 14, and the terminal tabs 4 and 5 are protruded to form a membrane electrode assembly. Forming step 10.
(2) A step of housing the membrane electrode assembly 10 in the sheet-like outer package 15 and sealing it (including the step of forming the adhesive layer).

(1) Step of Forming Membrane / Electrode Assembly In the method of manufacturing the lithium ion secondary battery 1 of this embodiment, first, the membrane / electrode assembly 10 is formed.
At this time, for example, after the positive electrode plate 2, the negative electrode plate 3, and the separator 14 formed in a band shape are cut in cell units in advance, the negative electrode plate 3, the separator 14, and the positive electrode plate 2 are stacked in this order. can do. Alternatively, it is possible to employ a method in which the belt-like positive electrode plate 2, the negative electrode plate 3, and the separator 14 are continuously fed out from a roll around which these are wound and sequentially laminated, and then the laminated body is divided into cell units.
Moreover, as a method of forming the semi-fixed or fixed electrolyte layer 13, for example, it is formed in advance on at least one plate surface of the positive electrode plate 2 or the negative electrode plate 3 or on both surfaces of the separator 14 before lamination. Can be used.

  The membrane electrode assembly 10 provided in the lithium ion secondary battery 1 of the example shown in FIG. 2 has a configuration in which each of the electrode plates 2 and 3, the separator 14, and the gel electrolyte layer 13 is provided. However, it is not limited to this. For example, although detailed illustration is omitted, the membrane electrode assembly may be configured by further overlapping a plurality of membrane electrode assemblies having the above-described configuration. In such a case, the membrane electrode assembly divided into cell units is used. It is good also as a structure which wound the membrane electrode assembly made into strip shape so that a positive electrode plate may be located inside. In this case, for example, it is possible to form a multilayer membrane electrode assembly in which nine positive electrode plates and ten negative electrode plates are laminated, and both outermost layers are negative electrode plates. Even in the case of manufacturing a lithium ion secondary battery including an electrode assembly, the present invention can be applied without any limitation.

  In forming a multilayer membrane electrode assembly, the positive electrode active material layer is not a plate surface facing outward of the lowermost layer of the multilayer membrane electrode assembly or a plate surface facing outward of the uppermost layer. It is preferable to form such that the formation of dendrite can be prevented.

In the step of forming the membrane electrode assembly 10, the terminal tabs 4 and 5 are joined to the end portions 7 and 11 of the positive electrode plate 2 and the negative electrode plate 3 by a joining means such as welding.
Specifically, welding electrodes (not shown) are arranged above and below the membrane electrode assembly 10, and the positive electrode plate 2 and the terminal tab 4 are disposed below the negative electrode plate 3, the separator 14, and the electrolyte layer 13. Thus, the welding electrode can be held from above and below to perform welding. Similarly, the negative electrode plate 3 and the terminal tab 5 may be sandwiched by welding electrodes from above and below with the separator 14, the gel electrolyte layer 13 and the positive electrode plate 2 interposed therebetween, and welding may be performed. it can.

(2) A step of housing and sealing the membrane electrode assembly in an exterior body (including a step of forming an adhesive layer)
Next, in the manufacturing method of the present embodiment, the membrane electrode assembly 10 obtained by the above method is accommodated in the outer package 15 and sealed.
Here, in this embodiment, before the membrane electrode assembly 10 is accommodated, the exterior body 15 has a configuration in which the adhesive layer 15B is formed on the surface 15c side of the base material 15A in advance, and the adhesive layer 15B is provided. Alternatively, the membrane electrode assembly 10 can be accommodated on the back surface 15d side of the outer package 15. Or after manufacturing the lithium ion secondary battery 1 in the procedure mentioned later, it is also possible to set it as the procedure of forming the contact bonding layer 15B on the base material 15A which makes the exterior body 15. FIG.

The method for forming the adhesive layer 15B on the base material 15A is not particularly limited. For example, the adhesive resin material described above, that is, a rubber-based resin, an acrylic resin, a silicon-based resin, and a urethane-based material. There is a method in which any one of the resins is discharged from a dispenser or the like onto the base material 15A.
Alternatively, the adhesive layer 15B can be formed by attaching release paper having a layer made of an adhesive resin to at least a part of the surface 15c side of the substrate 15A.
Alternatively, a sheet-like member made of aluminum or the like provided with an adhesive layer made of an adhesive material or the like on one surface side can be prepared, and the exterior body 15 can be configured from this sheet-like member.

  As described above, the shape of the adhesive layer 15B formed on the base material 15A is, for example, as shown in FIG. 3A so that a predetermined region on the surface 15c side of the base material 15A is covered with the adhesive material. Alternatively, it may be formed without a gap, or may be formed to have a shape in which an adhesive material is applied with a predetermined gap, such as the adhesive layers 15C to 15J shown in FIGS. 3 (b) to (i). Also good.

  And in the manufacturing method of this embodiment, after pinching and accommodating the membrane electrode assembly 10 from the up-down direction on the back surface 15d side of the outer package 15, the terminal tabs 4 and 5 are projected to the outside as the outer peripheral portion. 15a is sealed. At this time, a method is adopted in which the outer peripheral portion 15a is heated and pressurized by using a vacuum laminator, a roller, or a vacuum packaging machine so that the outer peripheral portion 15a of the outer package 15 is reliably sealed. Can do.

According to the manufacturing method of the present embodiment, as described above, the adhesive layer 15B is formed on the surface 15c side of the exterior body 15, and further, the adhesive layer 15B is formed in advance, thereby providing excellent workability and fixing strength. A lithium ion secondary battery can be manufactured.
In addition, by forming the adhesive layer 15B provided in the outer package 15 using the above-described resin, it is possible to manufacture the lithium ion secondary battery 1 that can be more securely and firmly fixed to the installation location. it can.
Although detailed illustration is omitted, a lithium ion secondary battery excellent in workability and fixing strength is efficiently manufactured by forming the adhesive layer 15B using a release paper having a layer made of an adhesive resin. be able to.

<Effect>
According to the lithium ion secondary battery 1 and the manufacturing method thereof according to the present invention, as described above, the adhesive layer 15B is provided on the surface 15c side of the exterior body 15 in advance. Affixing work, jigs, etc. are not required, handling is easy and workability is improved, and even a large lithium ion secondary battery 1 can be securely installed and fixed in a simple procedure. Become. Further, since the lithium ion secondary battery 1 can be fixed to the installation location by the adhesive layer 15B provided in the outer package 15, it is possible to suppress the terminal tabs 4 and 5 from being displaced due to external vibration or impact. It is possible to prevent disconnection and the like. Further, when the lithium ion secondary battery 1 is installed, an equal pressure is applied between the adhesive layer 15B and the installation location, and the lithium ion secondary battery 1 can be fixed in a strong and stable state. Therefore, for example, even when a large lithium ion secondary battery 1 is installed inside a wall or ceiling in addition to a narrow installation place such as in a car, the work at the time of construction is not complicated. The effect that it becomes possible to fix with the outstanding adhesive strength is produced.

  By applying the above-described lithium ion secondary battery and the manufacturing method thereof according to the present invention, for example, the lithium ion secondary battery having a large size of 300 mm × 600 mm and a thin thickness of 2 mm in plan view is obtained. When constructing the secondary battery with the wall as the installation location, the lithium ion secondary battery can be easily assembled without using nails or fixtures by using the adhesive layer 15B provided in advance on the exterior body 15. It becomes possible to install.

DESCRIPTION OF SYMBOLS 1 ... Lithium ion secondary battery, 2 ... Positive electrode plate (electrode plate), 3 ... Negative electrode plate (electrode plate) 4, 5 ... Terminal tab, 7 ... End part (positive electrode plate), 10 ... Membrane electrode assembly, DESCRIPTION OF SYMBOLS 11 ... End part (negative electrode plate), 13 ... Electrolyte layer, 14 ... Separator, 15 ... Exterior body, 15A ... Base material, 15c ... Front surface, 15d ... Back surface, 15B, 15E, 15F, 15G, 15H, 15I, 15J, 15K, 15L ... Adhesive layer

Claims (9)

A membrane electrode assembly in which a separator and an electrolyte layer are interposed between a positive electrode plate and a negative electrode plate and a terminal tab is projected, and a sheet-like sheet that accommodates and seals the membrane electrode assembly inside With an exterior body,
The outer package is a lithium ion secondary battery in which an adhesive layer is provided on at least a part of the surface side of the substrate.   2. The lithium ion secondary battery according to claim 1, wherein the adhesive layer is formed of any one of a rubber resin, an acrylic resin, a silicon resin, and a urethane resin.   3. The lithium ion secondary battery according to claim 1, wherein a thickness of the adhesive layer is in a range of 1 to 100 μm.   The lithium ion secondary battery according to any one of claims 1 to 3, wherein the adhesive layer is formed without a gap so as to cover a predetermined region on the surface side of the base material.   The adhesive layer is formed in any one of a linear shape, a substantially lattice shape, and a substantially dot shape in a plan view on the surface side of the base material. 4. The lithium ion secondary battery according to any one of 3 above. After laminating a separator and an electrolyte layer between the positive electrode plate and the negative electrode plate and projecting the terminal tab to form a membrane electrode assembly, the membrane electrode assembly is accommodated in a sheet-like outer package. A method of manufacturing a lithium ion secondary battery for sealing,
A method for producing a lithium ion secondary battery, comprising a step of forming an adhesive layer on at least a part of a surface side of a substrate provided in the exterior body.   7. The lithium according to claim 6, wherein in the step of forming the adhesive layer, the adhesive layer is formed on the surface side of the base material in advance before accommodating the membrane electrode assembly in the exterior body. A method for manufacturing an ion secondary battery.   In the step of forming the adhesive layer, at least a part of the surface side of the base material is coated with any of a rubber-based resin, an acrylic resin, a silicon-based resin, and a urethane-based resin. The method of manufacturing a lithium ion secondary battery according to claim 6 or 7, wherein: is formed.   The step of forming the adhesive layer is characterized in that the adhesive layer is formed by adhering a release paper having a layer made of an adhesive resin to at least a part of the surface side of the base material. The manufacturing method of the lithium ion secondary battery of Claim 6 or Claim 7.

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