JP3825593B2 - Manufacturing method of package - Google Patents

Description

を重量比で、活物質：導電助剤：高分子：溶媒＝８：１：１：１５となるように混合して高分子溶液を調製し、これをアルミニウム箔に塗布し、正負電極とした。
【００７０】
高分子固体電解質としてＰＶＤＦ微多孔膜を使用した。
【００７１】
次に、正極および負極を高分子固体電解質を介して積層し、正負極には実施例１に用いたアルミニウム端子を溶接した後、電解液を含浸させ、実施例１と同様に密閉した。なお、電解液には、プロピレンカーボネートに４フッ化ホウ酸４エチルアンモニウムを１Ｍの濃度で溶解したものを用いた。
【００７２】
その他は実施例１と同様にしてキャパシタを得た。また実施例１と同様にして比較サンプルを作製した。得られたキャパシタおよび比較キャパシタを実施例１と同様にして評価したところほぼ同様の結果が得られた。
【００７３】
【発明の効果】
以上のように、本発明によれば、余分なスペースを極力少なくし、折り曲げ箇所でのピンホールなどによるシール不良が生じることのない包装体を提供することができる。
【図面の簡単な説明】
【図１】本発明の包装体の構成を示した概略斜視図である。
【図２】本発明の包装体の製造過程を示した一部工程図である。
【図３】本発明の包装体の製造過程を示した一部工程図である。
【図４】本発明の包装体の製造過程を示した一部工程図である。
【図５】本発明の包装体の製造過程を示した一部工程図である。
【図６】本発明の包装体の製造過程を示した一部工程図である。
【図７】本発明の包装体の製造過程を示した一部工程図である。
【図８】本発明の包装体の製造過程を示した一部工程図である。
【図９】本発明の包装体の製造過程を示した一部工程図である。
【図１０】従来の包装体の構成を示した平面図である。
【図１１】図１０のＢ方向矢視図に相当する側面図である。
【符号の説明】
１ 包装体
２ 一方の端部
３ 側面部
４ 側面部
５ 他方の端面部
６ 導出端子[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method of manufacturing a lithium secondary battery or electric double layer capacitor was sealed package of a packaged articles of rectangular shape.
[0002]
[Prior art]
In recent years, secondary batteries using a carbon material, tin oxide, silicon oxide or the like as a negative electrode active material called a lithium secondary battery have been used or studied in various electronic products and electric vehicles. These lithium secondary batteries use a so-called electrolytic solution in which an electrolyte salt is dissolved in a liquid solvent.
[0003]
A battery using a polymer solid electrolyte is unlikely to leak because it does not use a liquid electrolyte. Therefore, it is not necessary to mechanically caulk with a metal container and a polymer packing in question as in a conventional battery using a liquid electrolyte. A battery using a polymer solid electrolyte can prevent liquid leakage by using a laminate film made of a polymer film and a metal foil as an outer bag (container).
[0004]
If such a battery or the like can be made into a sheet or stacked and miniaturized, it is predicted that application development to portable devices and the like will be further accelerated. An aluminum laminate bag is used as an outer package when manufacturing such a sheet-like electrochemical element. Examples of such a technique include techniques described in JP-A-11-67165 and JP-A-11-67167.
[0005]
These are all sealed aluminum laminate outer bodies. Various aspects have been conventionally studied in the field of food or medicine depending on the seal part and the seal part.
[0006]
When such an aluminum laminate outer package is used, there is an effect as described above in that the weight and thickness can be reduced. However, when such an exterior body is used for a packaged body having a rectangular shape and thickness such as a battery, various problems have occurred in relation to the characteristics and reliability of the packaged body.
[0007]
A two-way seal will be described as an example. Here, a thinned battery as a packaged body will be examined. FIG. 10 is a plan view of the package 31 formed by such a conventional two-way seal. For example, when the thickness of the battery is about 1 mm, even if the battery is normally sealed, the extra space depending on the thickness generated thereby is small. For this reason, the space which occupies with respect to the whole can also be made small by bending the seal part of both sides. However, when the thickness reaches about 2 mm, as shown in FIG. 10, an extra space 34 caused by the battery thickness is formed between the portion 32 corresponding to the object to be sealed and the seal portion 33. The ratio to the increase.
[0008]
For this reason, an extra space is required, which hinders effective use of the space. Further, for example, when a battery or the like is used as a packaged body, the energy density is lowered.
[0009]
Further, as shown in FIG. 11, when the seal portion 33 is bent downward, the bends at both sides become acute angles, and thus a large pinhole is likely to occur at the bent portion. In particular, it tends to occur at the lower end 34a, and this is particularly noticeable in an exterior body having a metal layer. FIG. 11 corresponds to a side view seen from the direction B of FIG.
[0010]
Moreover, the extra space which arises similarly about the to-be-packaged body upper part is also made. Therefore, in the conventional two-way sealing method, the above-described extra space is generated, and this portion has an influence particularly when the thickness reaches about 2 mm.
[0011]
[Problems to be solved by the invention]
An object of the present invention is to provide a method for manufacturing a package that minimizes an extra space and does not cause a sealing failure due to a pinhole at a bent portion.
[0012]
[Means for Solving the Problems]
Such an object is solved by the present invention described below.
(1) A package in which a lithium secondary battery as a thick rectangular packaged body is enclosed, and an exterior body that seals the packaged body includes a heat-adhesive resin layer and a metal layer The exterior body is wrapped by folding the package body on one end surface portion 2 side, and connecting the one end surface portion 2 and the other end surface portion 5 to each other, and In the method of manufacturing a package that is sealed by adhering the exterior body on the other end surface part 5 side, the exterior body is brought into close contact with the one end surface part 2 to bend the exterior body, and the one end surface Fold the outer body parts 21 and 22 other than the part in contact with the packaged body out of the outer body corresponding to the part 2 in the direction of the other end surface part 5 or side part 3 or 4 and correspond to the side parts 3 or 4. The exterior body parts 13 and 1 extending 4 is a method for manufacturing a packaging body in which 4 is folded and adhered along both edge portions 3a, 3b, 4a and 4b of the side surface portions 3 and 4, respectively.
(2) A packaging body in which an electric double layer capacitor as a thick rectangular packaged body is enclosed, and an outer package that seals the packaged body includes a heat-adhesive resin layer and a metal layer The exterior body is wrapped by folding the package body on one end surface portion 2 side, and connecting the one end surface portion 2 and the other end surface portion 5 to each other, and In the method of manufacturing a package that is sealed by bonding the exterior body on the other end surface portion 5 side, the exterior body is bent by bringing the exterior body into close contact with the one end surface portion 2, and the one end surface Fold the outer body parts 21 and 22 other than the part in contact with the packaged body out of the outer body corresponding to the part 2 in the direction of the other end surface part 5 or side part 3 or 4 and correspond to the side parts 3 or 4. And extending the outer body part 13 14, respectively both edges 3a of the side portions 3, 4, 3b, 4a, brought into close contact by folding along the 4b, the manufacturing method of the package to adhere.
( 3 ) Further, on the other end surface portion 5 side, only one of the exterior body portions 11a is bent along the other end surface portion 5 so that the one exterior body 11a and the other exterior body 11b are folded. The manufacturing method of the package of said (1) or (2) which adheres and adheres .
(4) The manufacturing method of the package in any one of said (1)-(3) whose thickness of the said to-be-packaged body is 2 mm or more .
[0013]
DETAILED DESCRIPTION OF THE INVENTION
The manufacturing method of the package of the present invention is a package in which a lithium secondary battery or an electric double layer capacitor is enclosed as a thick rectangular package, and the outer package that seals the package is , A laminate film having a heat-adhesive resin layer, and the exterior body wraps the packaged body by folding it at one end surface portion side, and connects the one end surface portion and the other end surface portion to the side surface portion side , And a method of manufacturing a package that is sealed by adhering the exterior body on the other end surface portion side, the exterior body is brought into close contact with the one end surface portion, the exterior body is bent, Outer body parts other than the part in contact with the package body in the outer body corresponding to the end surface part are folded in the direction of the other end surface part or side surface part, and the outer body part extending corresponding to both side surface parts ,Respectively Folded along the edges of, brought into close contact with the vicinity of the side surface portion, a manufacturing method of bonding.
[0014]
In this way, in the two-side seal, when bonding both side portions with respect to the folded portion, by bonding the surplus portions of the folded portion so as to be folded to the side portions, the space due to excessive swelling at the folded portion is reduced. In addition, since the folded portion does not have an acute angle or bulge, a sealing failure due to the occurrence of a pinhole or the like can be prevented.
[0015]
A more specific structure of the present invention will be described with reference to the drawings. FIG. 1 is a schematic perspective view showing an example of the package of the present invention. In this example, a packaging body in which an electrochemical device, in particular, a lithium secondary battery using a solid electrolyte is packaged is shown.
[0016]
In FIG. 1, a packaging body 1 obtained by the manufacturing method of the present invention is one in which a rectangular packaging body having a thickness, preferably 2 mm or more is enclosed, and the packaging body is sealed. The outer packaging body is a laminate film having a heat-adhesive resin layer and a metal layer , and the outer packaging body wraps the packaged body by folding it on one end surface portion 2 side, and the one end surface portion 2 and the other The exterior body on the side surface 3, 4 side connecting to the other end surface portion 5 and the other end surface portion 5 side is bonded to be sealed. Then, the exterior body part other than the part in contact with the packaged body of the exterior body part on the one end surface part 2 side is folded in the direction of the other end surface part 5 or side part 3, 4, and the side part 3. , 4 are opposed to each other and adhered to each other.
[0017]
That is, in the two-side seal method, when the outer package is folded in two and the package body is wrapped, the outer package is brought into close contact with one end surface portion 2 of the package body, and both edge portions 2a of the end surface portion 2 are provided. , 2b bend the exterior body. At this time, since the exterior body is U-shaped and wraps the package body, the exterior body part other than the part in contact with the package body inside the exterior body corresponding to the end surface portion 2 is inside, That is, it is made to fold in the direction of the other end face part 5 thru / or side face parts 3 and 4. Then, the outer body part 13, 14 extends in correspondence with both side portions 3 and 4, the opposite edges 3a respectively, 3b, 4a, with bent along the 4b, adhering to tight wear. Thereby, the unnecessary protrusion of an exterior body is eliminated from one end surface part 2 to both side surface parts 3 and 4.
[0018]
Further, on the other end surface portion 5 side of the packaged body, among the exterior body portions not corresponding to the packaged body, the upper package body on the drawing is bent along the upper edge portion of the other end surface 5 and the end portion ( Adhere to the lower exterior body in the vicinity of the lower edge). In this way, by adhering and bonding the exterior bodies to each other on one edge side of the end surface of the packaged body, it is possible to secure a space that can be used for this bonding site. That is, in this part, if it is another component, for example, an electrochemical device, a circuit (substrate, circuit component) and the like associated therewith can be arranged.
[0019]
In FIG. 1, two strips extending from the other end surface portion are lead-out terminals 6 of the packaged body (secondary battery), and a seal portion 15 corresponding to the other end surface portion 5 is interposed therebetween. Thus, the packaged body and the outside are electrically connected while ensuring the sealing performance. Such a lead-out terminal 6 is provided as necessary depending on the type of package, and may or may not be present in the present invention.
[0020]
Next, the packaging method of the packaging body of this invention is explained in full detail. 2 to 9 are schematic process diagrams showing the process of packaging the package of the present invention.
[0021]
First, as shown in FIG. 2, the package body 12 is placed on the bonding surface side of the exterior body 11. At this time, when the outer package 11 is folded in the direction of the arrow in the figure and wrapped, the package body 12 is placed so as to be in a position that is just better than the bonding margin. Subsequently, the exterior body 11 is bent along the package body 12 as indicated by arrows in the figure.
[0022]
After that, as shown in FIG. 3, a portion of the exterior body that does not correspond to the package body 12, that is, the surplus portions 13, 14, 21, 22, and 15 are bent. At this time, on one end face 2 side of the package body 12, as shown in FIG. 4, the central portions 21 a and 22 a of the surplus portions 21 and 22 are arranged inside (toward the package body 12) as indicated by arrows. That is, it is made to fold (bend) in the direction of the other end face part 5 thru / or side face parts 3 and 4. Thus, by so folded surplus portions 21 and 22 inwardly, the upper surplus portions 13 and 14, and lower exterior body is tightly Chakusuru.
[0023]
Moreover, on the other end surface part 5 side of the packaged body 12, as shown in FIG. 5, the upper side 11 a of the exterior body 11 is bent along the end surface. Then, the upper exterior body 11a and the lower exterior body 11b are brought into close contact with each other on the lower edge side (end portion) of the end surface portion 5 and bonded. Next, as in FIG. 4, the generated surplus parts 51 a and 52 a are folded inward (toward the packaged body 12), that is, in the direction of one end face 2 or side faces 3 and 4, as indicated by arrows. (Fold). Thus, excess portions 51a, by so folded to 52a inwardly, at the other end face 5 side, above the surplus portions 13 and 14, and lower exterior body is tightly Chakusuru.
[0024]
And the surplus parts 13, 14, and 15 are adhere | attached, and it comes to show to FIGS. Here, FIG. 7 is a partial perspective view showing one end face 2 side of FIG. 6, and FIG. 8 is a partial perspective view showing the other end face 5 side of FIG. 7 and 8, the seal portions 13a, 14a and 15 are indicated by hatching.
[0025]
Finally, as shown in FIG. 9, the seal portions 13a and 14a on both sides are bent downward or on the bottom side along the article to be packaged to form a package.
[0026]
As described above, since the packaging body of the present invention can be wrapped with the exterior body with almost no excess area along the package body, the extra space is reduced, and the equipment to be mounted is reduced in size and space. Can contribute. Further, in the space 18 formed on the other end face 5 side shown in FIG. 9 and the like, necessary articles and the like can be arranged, which can be further used for space saving.
[0027]
The packaged body of the present invention is a lithium secondary battery or an electric double layer capacitor . The thickness of the package is not particularly limited, but is preferably 2 mm or more, more preferably 3 mm or more, and particularly 4 mm or more. The upper limit is not particularly limited, but is usually about 100 mm. It is not particularly limited in size, usually of the order of 30 to 100 mm × 30 to 100 mm.
[0029]
The lithium secondary battery includes positive and negative electrodes made of a current collector such as an aluminum foil and a copper foil, and a polymer solid electrolyte. Lead-out terminals 6 are connected to the positive and negative electrodes, respectively. The lead-out terminal 6 is made of a metal such as aluminum, copper, nickel, and stainless steel, and has a lead shape having a rectangular or circular cross section.
[0030]
The exterior body is composed of a laminate film in which a polyolefin resin layer such as polypropylene or polyethylene as a heat-adhesive resin layer or a heat-resistant polyester resin layer is laminated on both surfaces of a metal layer such as aluminum.
[0031]
Further, an acid-modified polyolefin resin may be used in order to ensure adhesion with the lead-out terminal. Examples of the acid-modified polyolefin resin include acid-modified polyethylene such as carboxylic acid and acid-modified polypropylene obtained by graft polymerization of maleic anhydride, and acid-modified polypropylene is particularly preferable.
[0032]
In addition, when using an element having a lead-out terminal such as an electrochemical device for the packaged body, as the laminate film constituting the outer package, in order to ensure insulation between the metal foil constituting the laminate film and the lead-out terminal, the inner layer side It is preferable to use a laminate film having a laminated structure of heat adhesive resin layer / polyester resin layer / metal foil / polyester resin layer. By using such a laminate film, the polyester resin layer having a high melting point remains undissolved at the time of thermal bonding, so that the separation distance between the lead-out terminal and the metal foil of the outer bag can be secured and insulation can be ensured. . Therefore, the thickness of the polyester resin layer of the laminate film is preferably about 5 to 100 μm.
[0033]
The package of the present invention is used for the following lithium secondary battery and electric double layer capacitor as a package.
[0034]
<Lithium secondary battery>
Although the structure of the lithium secondary battery used in the present invention is not particularly limited, it is usually composed of a positive electrode, a negative electrode and a polymer solid electrolyte, and is suitably applied to a sheet type battery, a cylindrical battery and the like.
[0035]
The electrode combined with the polymer solid electrolyte may be appropriately selected from known electrodes for lithium secondary batteries, and is preferably a composition comprising an electrode active material, a gel electrolyte, and optionally a conductive assistant. Is used.
[0036]
The negative electrode uses a negative electrode active material such as a carbon material, lithium metal, lithium alloy or oxide material, and the positive electrode such as an oxide or carbon material capable of intercalating / deintercalating lithium ions. It is preferable to use a positive electrode active material. By using such an electrode, a lithium secondary battery having good characteristics can be obtained.
[0037]
The carbon material used as the electrode active material may be appropriately selected from, for example, mesocarbon microbeads (MCMB), natural or artificial graphite, resin-fired carbon material, carbon black, carbon fiber, and the like. These are used as powders. Of these, graphite is preferable, and the average particle size is preferably 1 to 30 μm, particularly preferably 5 to 25 μm. When the average particle size is too small, the charge / discharge cycle life is shortened and the capacity variation (individual difference) tends to increase. When the average particle diameter is too large, the variation in capacity becomes remarkably large and the average capacity becomes small. The reason why the variation in capacity occurs when the average particle size is large is thought to be because the contact between graphite and the current collector or the contact between graphites varies.
[0038]
The oxide capable of intercalating and deintercalating lithium ions is preferably a composite oxide containing lithium, and examples thereof include LiCoO ₂ , LiMn ₂ O ₄ , LiNiO ₂ , and LiV ₂ O ₄ . The average particle diameter of these oxide powders is preferably about 1 to 40 μm.
[0039]
If necessary, a conductive additive is added to the electrode. Preferred examples of the conductive aid include metals such as graphite, carbon black, carbon fiber, nickel, aluminum, copper, and silver, and graphite and carbon black are particularly preferable.
[0040]
The electrode composition is preferably in the range of active material: conducting aid: gel electrolyte = 30 to 90: 3 to 10:10 to 70 by weight ratio in the positive electrode, and active material: conducting aid in weight ratio in the negative electrode. : Gel electrolyte = The range of 30-90: 0-10: 10-70 is preferable. The gel electrolyte is not particularly limited, and a commonly used gel electrolyte may be used. Moreover, the electrode which does not contain a gel electrolyte is also used suitably. In this case, a fluororesin, fluororubber, or the like can be used as the binder, and the amount of the binder is about 3 to 30 wt%.
[0041]
In manufacturing the electrode, first, an active material and, if necessary, a conductive additive are dispersed in a gel electrolyte solution or a binder solution to prepare a coating solution.
[0042]
And this electrode coating liquid is apply | coated to a collector. The means for applying is not particularly limited, and may be appropriately determined according to the material and shape of the current collector. In general, a metal mask printing method, an electrostatic coating method, a dip coating method, a spray coating method, a roll coating method, a doctor blade method, a gravure coating method, a screen printing method and the like are used. Then, if necessary, a rolling process is performed using a flat plate press, a calendar roll, or the like.
[0043]
The current collector may be appropriately selected from ordinary current collectors according to the shape of the device used by the battery, the method of arranging the current collector in the case, and the like. Generally, aluminum or the like is used for the positive electrode, and copper, nickel, or the like is used for the negative electrode. In addition, a metal foil, a metal mesh, etc. are normally used for a collector. The metal mesh has a smaller contact resistance with the electrode than the metal foil, but a sufficiently small contact resistance can be obtained even with the metal foil.
[0044]
Then, the solvent is evaporated to produce an electrode. The coating thickness is preferably about 50 to 400 μm.
[0045]
As the polymer film, for example, a polymer microporous film such as PEO (polyethylene oxide), PAN (polyacrylonitrile), PVDF (polyvinylidene fluoride), or the like can be used.
[0046]
Such a positive electrode, a polymer film, and a negative electrode are laminated in this order, and pressed to form a battery body.
[0047]
The electrolytic solution impregnated in the polymer membrane generally comprises an electrolyte salt and a solvent. As the electrolyte salt, for example, a lithium salt such as LiBF ₄ , LiPF ₆ , LiAsF ₆ , LiSO ₃ CF ₃ , LiClO ₄ , LiN (SO ₂ CF ₃ ) ₂ can be applied.
[0048]
The solvent of the electrolytic solution is not particularly limited as long as it has good compatibility with the above-described solid polymer electrolyte and electrolyte salt, but a polar organic solvent that does not decompose even at a high operating voltage in a lithium battery, for example, , Ethylene carbonate (abbreviation EC), propylene carbonate (abbreviation PC), butylene carbonate, dimethyl carbonate (abbreviation DMC), carbonates such as diethyl carbonate and ethyl methyl carbonate, cyclic ethers such as tetrahydrofuran (THF) and 2-methyltetrahydrofuran Cyclic ethers such as 1,3-dioxolane and 4-methyldioxolane, lactones such as γ-butyrolactone, sulfolane and the like are preferably used. 3-methylsulfolane, dimethoxyethane, diethoxyethane, ethoxymethoxyethane, ethyl diglyme and the like may be used.
[0049]
The concentration of the electrolyte salt is preferably 0.3 to 2 mol / l when it is considered that the electrolytic solution is composed of the solvent and the electrolyte salt. Usually, the highest ionic conductivity is shown around 1 mol / l.
[0050]
When a microporous polymer film is immersed in such an electrolyte solution, the polymer film absorbs the electrolyte solution and gels to form a solid polymer electrolyte.
[0051]
When the composition of the polymer solid electrolyte is represented by polymer / electrolyte, the ratio of the electrolyte is preferably 40 to 90 wt% from the viewpoint of the strength of the membrane and the ionic conductivity.
[0052]
<Electric double layer capacitor>
The structure of the electric double layer capacitor used in the present invention is not particularly limited. Usually, a pair of polarizable electrodes are arranged via a polymer solid electrolyte, and insulation is provided around the polarizable electrode and the polymer solid electrolyte. A gasket is arranged. Such an electric double layer capacitor may be any of so-called coin type, sheet type, laminated type and the like.
[0053]
As the polarizable electrode, activated carbon, activated carbon fiber or the like is used as an active material, and a fluororesin, fluororubber or the like is added as a binder. And it is preferable to use what formed this mixture in the sheet-like electrode. The amount of the binder is about 5 to 15 wt%. A gel electrolyte may be used as the binder.
[0054]
The current collector used for the polarizable electrode may be a conductive rubber such as conductive butyl rubber, or may be formed by thermal spraying of a metal such as aluminum or nickel, and a metal mesh is formed on one surface of the electrode layer. It may be attached.
[0055]
An electric double layer capacitor is combined with a polarizable electrode as described above and a solid polymer electrolyte.
[0056]
As the polymer film, for example, a polymer microporous film such as PEO (polyethylene oxide), PAN (polyacrylonitrile), PVDF (polyvinylidene fluoride), or the like can be used.
[0057]
Examples of the electrolyte salt include (C ₂ H ₅ ) ₄ NBF ₄ , (C ₂ H ₅ ) ₃ CH ₃ NBF ₄ , (C ₂ H ₅ ) ₄ PBF _{4, and the} like.
[0058]
The non-aqueous solvent used in the electrolytic solution may be various known ones, and is an electrochemically stable non-aqueous solvent such as propylene carbonate, ethylene carbonate, γ-butyrolactone, acetonitrile, dimethylformamide, 1,2-dimethoxy. Ethane, sulfolane alone or a mixed solvent is preferred.
[0059]
The concentration of the electrolyte in such a nonaqueous solvent electrolyte solution may be 0.1 to 2 mol / l.
[0060]
When a microporous polymer film is immersed in such an electrolyte solution, the polymer film absorbs the electrolyte solution and gels to form a solid polymer electrolyte.
[0061]
When the composition of the polymer solid electrolyte is represented by polymer / electrolyte, the ratio of the electrolyte is preferably 40 to 90 wt% from the viewpoint of the strength of the membrane and the ionic conductivity.
[0062]
An insulating material such as polypropylene or butyl rubber may be used as the insulating gasket.
[0063]
【Example】
[Example 1]
(Production of battery)
As terminal materials, aluminum foil and nickel foil having a width of 4 mm, a length of 50 mm, and a thickness of 0.1 mm were prepared. The electrode was prepared by applying a positive electrode made of LiCoO ₂ , carbon black (HS-100, manufactured by Denki Kagaku Kogyo), and PVDF (polyvinylidene fluoride) to an aluminum foil by a doctor blade method. The negative electrode was prepared by applying mesocarbon microbeads (MCMB), HS-100, and PVDF to a copper foil by the doctor blade method. A PVDF microporous membrane was used as the polymer solid electrolyte. The positive electrode and the negative electrode were cut into a width of 31 mm and a length of 51 mm. The separator was cut to a width of 33 mm and a length of 53 mm.
[0064]
The battery element was produced as follows. First, a positive electrode and a separator were laminated and laminated by hot pressing. Lamination was performed at 80 ° C. for 1 minute at a pressure of 3 kgcm ⁻² . A negative electrode was laminated thereon and laminated in the same manner.
[0065]
The aluminum lead-out terminal of the battery body and the nickel lead-out terminal were similarly resistance-welded to the copper current collector. This battery body was immersed for 30 minutes in 330 ml of an electrolytic solution in which 1 M of LiPF ₆ was dissolved in a mixed solvent of EC (ethylene carbonate) and DMC (dimethyl carbonate) in a volume ratio of 1: 2. After removing the battery body from the electrolytic solution, the electrolytic solution adhering to the electrode surface was wiped off. The battery body absorbed the electrolyte and became a gel state. A laminate sheet (innermost layer is PP) made of PET (12 μm) / aluminum (20 μm) / PET (12 μm) / PP (80 μm) is heat-sealed according to the method shown in FIG. 1 and FIGS. 50 polymer lithium secondary batteries were produced. In addition, 50 comparative samples sealed by the two methods as shown in FIGS. In the above, PET: polyethylene terephthalate and PP: polypropylene.
[0066]
First, the energy density was calculated from the chargeable amount in the volume occupied by the arbitrarily extracted invention sample and the comparative sample. As a result, it was 245 wh / l in the comparative sample, whereas the energy density of the sample of the present invention was increased by about 10% to 262 wh / l.
[0067]
Next, the present invention and 50 comparative samples were stored at 85 ° C. for 3 weeks, and the weight change before and after the measurement was measured. At that time, it was judged that a cell having a weight change of −3.0 wt% or more had a pinhole.
[0068]
As a result, in the comparative sample, 12/50 pinholes were observed, but in the sample of the present invention, 0/50 pinholes were not observed.
[0069]

Are mixed in a weight ratio such that active material: conductive auxiliary agent: polymer: solvent = 8: 1: 1: 15 to prepare a polymer solution, which is applied to an aluminum foil to form positive and negative electrodes. .
[0070]
A PVDF microporous membrane was used as the polymer solid electrolyte.
[0071]
Next, the positive electrode and the negative electrode were laminated via a polymer solid electrolyte, and the aluminum terminals used in Example 1 were welded to the positive and negative electrodes, and then impregnated with an electrolytic solution, and sealed in the same manner as in Example 1. In addition, what melt | dissolved 4 ethyl ammonium tetrafluoroborate in the density | concentration of 1M in propylene carbonate was used for electrolyte solution.
[0072]
Other than that, a capacitor was obtained in the same manner as in Example 1. A comparative sample was produced in the same manner as in Example 1. When the obtained capacitor and comparative capacitor were evaluated in the same manner as in Example 1, almost the same results were obtained.
[0073]
【The invention's effect】
As described above, according to the present invention, it is possible to provide a package that reduces extra space as much as possible and does not cause a sealing failure due to a pinhole or the like at a bent portion.
[Brief description of the drawings]
FIG. 1 is a schematic perspective view showing a configuration of a package of the present invention.
FIG. 2 is a partial process diagram illustrating the manufacturing process of the package of the present invention.
FIG. 3 is a partial process diagram illustrating the manufacturing process of the package of the present invention.
FIG. 4 is a partial process diagram illustrating the manufacturing process of the package of the present invention.
FIG. 5 is a partial process diagram illustrating the manufacturing process of the package of the present invention.
FIG. 6 is a partial process diagram illustrating the manufacturing process of the package of the present invention.
FIG. 7 is a partial process diagram illustrating the manufacturing process of the package of the present invention.
FIG. 8 is a partial process diagram illustrating the manufacturing process of the package of the present invention.
FIG. 9 is a partial process diagram illustrating a manufacturing process of the package of the present invention.
FIG. 10 is a plan view showing a configuration of a conventional package.
11 is a side view corresponding to the view in the direction of arrow B in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Package 2 One end part 3 Side part 4 Side part 5 The other end part 6 Lead-out terminal

Claims (4)

A package body in which a lithium secondary battery as a rectangular package body having a thickness is enclosed, and an outer package for sealing the package body is a laminate film having a heat-adhesive resin layer and a metal layer . The exterior body wraps the packaged body by folding it at one end surface side, and the exterior body on the side surface portion connecting the one end surface portion and the other end surface portion, and the other end surface portion side In a method of manufacturing a package that is sealed by being bonded,
The exterior body is bent by bringing the exterior body into close contact with the one end surface portion, and the exterior body portion other than the portion that is in contact with the packaged body of the exterior body corresponding to the one end surface portion is the other end surface. A method of manufacturing a packaging body, in which an exterior body part that is folded in the direction of a side part or a side part and extends corresponding to both side parts is bent and adhered along both edges of the side part. A packaging body in which an electric double layer capacitor as a thick rectangular packaged body is enclosed, and the outer package that seals the packaged body is a laminate film having a heat-adhesive resin layer and a metal layer The exterior body wraps the packaged body by folding it on one end surface side, and the side surface portion side connecting the one end surface portion and the other end surface portion, and the exterior body on the other end surface portion side are bonded. In a method of manufacturing a package that is sealed by being
The exterior body is bent by bringing the exterior body into close contact with the one end surface portion, and the exterior body portion other than the portion that is in contact with the packaged body of the exterior body corresponding to the one end surface portion is the other end surface. A method of manufacturing a packaging body, in which an exterior body portion that is folded in the direction of a side portion or a side surface portion and extends corresponding to both side surface portions is folded and adhered along both edge portions of the side surface portion. According to claim 1 or 2 further wherein the folded along only one of the exterior body of the exterior body portion to the other end face at the other end face side to adhere to contact the exterior body and the other of the exterior body of the one The manufacturing method of the package body of description . The method for manufacturing a package according to any one of claims 1 to 3, wherein a thickness of the package is 2 mm or more .

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