KR101830120B1 - Battery casing, film packaging battery - Google Patents

Abstract

The present invention provides a battery container, a film packaging battery, and a method of manufacturing the same. The present invention provides a battery container having a container body formed of a laminated film having a metal foil and a deposition layer, wherein the peripheral wall of the container body is drawn and formed so that the deposited layer of the laminated film is convex toward the storage portion, A welded layer of both side faces of a pair of opposed concave walls rising from the bottom of the square is welded and welded to both side edges of a pair of opposing wall faces rising from the bottom, Lt; / RTI >

Description

[0001] BATTERY CASING, FILM PACKAGING BATTERY [0002]

The present invention relates to a battery container, a film packaging battery, and a method of manufacturing the same.

2. Description of the Related Art Conventionally, a battery container for housing a battery element such as a lithium ion secondary battery or an electric double layer capacitor (all charging and power generating elements including an electrolyte), a lid body is welded to a deep drawn metal container having excellent water vapor barrier properties A sealed metal enclosed container having a welded structure is often used. However, the metal sealed container of the welded structure is heavy, has a large volume, and has a problem that the productivity is poor due to complicated welding process. Particularly, the welding process of the metal container body and the lid body requires a large number of process steps, which is problematic from the viewpoint of productivity. In addition, since lithium batteries for electric vehicles and the like have a large number of battery containers to be loaded in a vehicle, it is desired to make the battery containers as light as possible and to make them compact.

With respect to this demand, a pouch-shaped container in which a laminate in which a base layer, a metal foil such as aluminum and a sealant layer are laminated in order, or a pouch-shaped container in which a laminate is formed by press molding the recesses, (Hereinafter, referred to as Patent Documents 1 and 2) such as an emboss type container (also referred to as a " drawing forming container ") for housing a lithium ion battery main body.

A battery container using a draw-formed container can be accommodated even with a battery element having a certain thickness, and it is easy to fill and package the battery element, and the volume efficiency (volume efficiency means a volume of the battery element with respect to the total volume of the battery container ) Is high, it is easy to be lightweight, and it has an advantage of being cheap.

Japanese Patent Application Laid-Open No. 2002-216713 Japanese Laid-Open Patent Publication No. 2010-262932

However, as described in Patent Documents 1 and 2, when a lubricant such as a fatty acid amide type or liquid paraffin is used in a battery container using a draw-molded container, lubricity of the surface of the embossing mold and the laminate increases, It is possible to improve the property. However, even if the drawability is improved, the drawing depth is limited because the metal foil is drawn in a three-dimensional shape, and the depth of the draw-formed container is the upper limit value of about 10 mm. For this reason, there has been a problem that a battery container using a drawing-molded container can not accommodate a battery device having a large thickness and a large thickness.

In addition, since the corner portion of the draw-formed container is particularly increased in size, the metal foil is thinned at the corners, resulting in small cracks or pinholes. When moisture enters from a small cracked portion or pinhole of the metal foil, the electrolytic solution reacts with moisture to generate hydrofluoric acid or the like. For this reason, there has been a problem that the welded portion of the electrode member or the like is corroded and deteriorates to leak electrolyte.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a battery container which is lightweight, has a high capacity efficiency, can accommodate a battery device having a large capacity and a large thickness easily, A battery pack which can be manufactured, a battery pack using the same, and a method of manufacturing the same.

In the present specification, the concave wall of the battery container is sometimes referred to as a side wall for convenience of description, but it refers to the same portion.

The present invention provides the following battery container.

(1) A battery container having a container body formed of a laminated film having a metal foil and a deposited layer, wherein the peripheral wall of the container body is drawn and formed so that the deposited layer of the laminated film is convex toward the receiving portion, A welded layer of both side faces of a pair of opposed concave walls rising from the bottom of the square is welded and welded to both side edges of a pair of opposing wall faces rising from the bottom, .

(2) The battery container according to (1), wherein the welded layer of the folded portion folded and folded on the bottom portion of the concave wall is welded to the welded layer of the bottom portion.

(3) A battery container according to (1) or (2), wherein the concave portion of the concave wall is filled with a reinforcing resin.

Further, the present invention provides the following film packaging battery.

(4) A film packaging battery using the battery container according to any one of (1) to (3), wherein the battery element is housed in the container body and sealed with a cover material.

Further, the present invention provides the following method for producing a battery container.

(5) a container body formed of a laminated film having a metal foil and a deposition layer, wherein the peripheral wall of the container body is drawn and formed so that the deposited layer of the laminated film is convex toward the receiving portion side, A method for manufacturing a battery container in which a welding layer at both side faces of a pair of opposite concave walls rising from a bottom portion of a folded structure is welded to and welded to both side edges of a pair of opposing wall faces rising from the bottom portion And a plurality of the bottom portions of the plurality of container bodies arranged at regular intervals in the longitudinal direction of the long laminated film are arranged between adjacent portions of the laminated film on both sides in the width direction of the laminated film, Forming a concave-shaped wall by drawing-forming at intervals longer than the length of the portions welded to the two opposing side faces of each other And a drawing forming step of forming a laminated film on the periphery of the concave wall so that the width of the laminated film becomes the width of the bottom part and the concave wall is spread out as a plurality of free ends, A notch forming step of forming a notch part; a step of folding the concave wall on both sides of the laminated film so as to face each other so as to face each other so as to bend from the bottom part of the concave part, A rising step of raising an end wall of the laminated film in a portion where the concave wall is not present from a bottom portion of an end extending projection of the concave wall with respect to a portion where the concave wall does not exist; And the edges are overlapped and welded to the welded layers on both end faces of the concave wall, And connecting the concave wall to the wall surface forming the peripheral wall of the container main body.

(6) The method for manufacturing a battery container according to (5), wherein the step of welding the concave wall with the welding layer of the folded portion of the concave wall and the portion of the bottom of the concave wall, .

(7) The method for manufacturing a battery container according to (5) or (6), wherein drawing-forming in the mold of the injection molding machine and filling of the concave portion of the concave wall with the reinforcing resin are performed in the drawing-forming step.

(8) The method for manufacturing a battery container as described in any one of (5) to (7), further comprising an electrode opening step of forming an electrode lead-out portion formed as an opening in the long laminated film.

Further, the present invention provides the following method for producing a film packaging battery.

(9) A method of manufacturing a film packaging battery using the method for manufacturing a battery container according to any one of the above (5) to (8), wherein the battery container formed by the wall- And a sealing step of fusing a cover material to the opening of the battery container in this order.

Since the battery container and the film packaging battery of the present invention are composed of the laminated film including the bottom portion of the container body and the metal foil having the thin peripheral wall in the battery container as in the battery container using the draw- High gas barrier property, light weight, and high volume efficiency.

In addition, unlike a battery container using a draw-formed container, the battery container and the film packaging battery of the present invention are characterized in that the welded layers of both side faces of a pair of opposite concave walls rising from the bottom by folding the peripheral wall from the bottom are folded The watertight structure can be formed and the beam-form formation is excellent since the wafers are welded and connected to the welded layers at the opposite side edges of the pair of opposing end walls standing up.

Further, the battery container and the film packaging battery of the present invention can accommodate a battery element having an arbitrary thickness by folding the laminated film including the metal foil with a folding line. As a result, it is possible to accommodate a thick-capacity battery element of a large capacity. Therefore, it is not necessary to emboss processing for deep drawing in a three-dimensional shape, so that even if the thickness of the metal foil is thin, cracks and pinholes do not occur in the metal foil.

In addition, the battery container and the film packaging battery of the present invention can use a laminated film using a metal foil which is low in malleability and low in drawability, which can not be used in a draw-molded container if the thickness of the metal foil is reduced.

Further, since the concave wall and the lid material are welded together, at least two opposing sides of the film packaging battery can be sealed by bonding the lid material to the concave wall. As a result, the fused portion of the lid member does not protrude outwardly of the battery container, so that the battery becomes compact, and the volume of the integrated body can be reduced when a plurality of battery containers are used for integration. In addition, handling of a plurality of battery containers during storage and accumulation is also excellent.

Further, since the seal width when the concave wall and the lid member are welded together can be made sufficiently large, the welding is easy and reliable, and the gas barrier property is also enhanced.

According to the invention as set forth in claim 2, since the welded layer of the folded portion folded and folded at the bottom of the concave wall is welded to the welded layer at the bottom, a watertight structure is formed and the beam formability is better. Further, it is easy and reliable to weld the welded layers of both end faces of the concave wall and the welded layers of both side edges of the wall surface rising from the bottom of the concave wall.

According to the invention as set forth in claim 3, since the concave portion of the concave wall is filled with the reinforcing resin, the beam forming is more excellent. In addition, the deposition of the deposition layer at both side end faces of the concave wall and the deposition layers at both side edges of the wall surface rising from the bottom portion is easy and reliable.

Further, according to the method for manufacturing a battery container and a film packaging battery of the present invention, it is possible to continuously form a plurality of battery container bodies using a long laminated film. This makes it possible to continuously produce a battery container or a film packaging battery while winding a roll, a bobbin winding or a cassette winding, or a laminated film drawn by drawing a portion to be a concave wall. Therefore, the productivity of the battery container and the film packaging battery can be increased.

1 is a perspective view showing an outer shape of a battery container according to a first embodiment;
2 is a side view of the battery container of the first embodiment; (a) is a side view in the direction of arrows II-II in Fig. 1, and Fig. 1 (b) is a side view in which a part thereof is enlarged.
3 is a sectional view of the battery container of the first embodiment. (a) is a cross-sectional view in the direction of the arrow I-I in Fig. 1, and (b) is a cross-sectional view partially enlarged.
4 is an external view of a film packaging battery using the battery container of the first embodiment. (a) is a perspective view, and (b) is an enlarged view of a part of a side view.
5 is a perspective view showing the formation of a concave portion of a concave wall by drawing-forming in the production of a battery container according to the first embodiment;
6 is a perspective view showing a resin molded body formed in a concave portion of a concave wall in the production of a battery container according to the first embodiment;
7 is a perspective view showing a film notch process in the production of the battery container of the first embodiment;
8 is a schematic cross-sectional view showing an example of a mold of an injection molding machine used in drawing forming processing in the production of the battery container of the first embodiment.
Fig. 9 is a schematic cross-sectional view showing a drawing forming step in the production of the battery container of the first embodiment. Fig.
10 is a schematic cross-sectional view showing the formation of a resin molded article in a concave portion of a concave wall in the production of a battery container according to the first embodiment;
11 is a schematic cross-sectional view showing the release of a drawn laminated film from a metal in the production of the battery container of the first embodiment.
12 is a perspective view showing a step of rising the concave wall in the production of the battery container of the first embodiment;
Fig. 13 is a perspective view showing a connecting process of a wall surface in manufacturing the battery container of the first embodiment. Fig.
14 is a perspective view showing a drawing forming process in the production of a battery container of a first embodiment using a long laminated film.
15 is a perspective view showing a film notch process in the production of the battery container of the first embodiment using a long laminated film.
Fig. 16 is a perspective view showing a step of rising the concave wall in the production of the battery container of the first embodiment using a long laminated film. Fig.
17 is a plan view for explaining the state of the film notch in the production of the battery container of the first embodiment using the long laminated film.
18 is a perspective view showing a part of a step of rising the concave wall in the production of the battery container of the first embodiment using a long laminated film.
19 is a perspective view showing a part of a process of connecting a wall surface in the production of a battery container according to a first embodiment using a long laminated film.
20 is a perspective view showing the process of storing the battery element in the production of the battery container of the first embodiment using the long laminated film.
21 is a perspective view showing a sealing process in the production of a battery container according to the first embodiment using a long laminated film.
22 is a view showing the outer shape of the battery container of the second embodiment. (a) is a perspective view, and (b) is an enlarged view of a part of a side view.
23 is a view showing the outline of the battery container of the third embodiment. (a) is a perspective view and (b) is a side view.
24 is an enlarged view of a part of a side view of the battery container of the fourth embodiment;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings.

≪ Example of first embodiment &

The battery container 10 of the first embodiment shown in Figs. 1 to 3 has a container body 4 made of a laminated film 1 having a metal foil and a deposition layer.

The battery container 10 of the first embodiment is configured such that the covering material 3 is mounted after the battery element 5 is housed in the container main body 4 and the film packaging battery 20 of the first embodiment shown in Fig. do. The film packaging battery 20 of the first exemplary embodiment is preferably used as a battery container such as a secondary battery or an electric double layer capacitor.

In the film packaging battery 20 of the first embodiment, a battery element 5 having a positive electrode plate, a negative electrode plate, a separator, and an electrolytic solution is housed inside the battery container 10. Further, the battery element 5 includes all the elements necessary for charging and power generation including electrolytes.

In the film packaging battery 20 of the first embodiment, the electrode leads 47 made of the positive electrode lead and the negative electrode lead electrically connected to the positive and negative electrode plates are protruded from the battery container 10 in opposite directions. The electrode leads 47 are mounted on the electrode plates of the positive and negative electrodes and are electrically connected.

As the separator, a sheet-like member capable of impregnating an electrolyte, such as a porous film made of a thermoplastic resin such as polyolefin, a nonwoven fabric or a woven fabric, is used.

The battery container 10 of the first embodiment shown in Figs. 1 to 3 has a container body 4 made of a laminated film 1 having a metal foil and a deposition layer.

The container body 4 has a bottom portion 41 formed in a rectangular shape when viewed in a plan view, a pair of end walls 42 and 42 rising from an end edge of the bottom portion 41, A pair of concave walls 43 and 43 formed by drawing a concave wall which is convexly formed on the side of the receiving portion and rising from the side edge of the bottom portion 41 and a concave portion 45 of the concave wall 43 Shaped resin molded body 2 formed on the side walls 42 and 42 and lead gripping portions 44 and 44 extending outwardly from the upper edge portions of the end walls 42 and 42.

The peripheral wall of the container main body 4 is formed by folding the end walls 42 and 42 and the concave walls 43 and 43 with a folding line formed by a straight line and standing from the bottom portion 41 having a rectangular shape, It can be made into a watertight structure.

Since the container body 4 is formed of the laminated film 1 in which the peripheral wall portion rising from the bottom portion 41 is folded by the folding line formed by a straight line, There is no need to emboss processing for drawing in a 3D shape.

Therefore, there is no numerical limitation on the depth that the container body 4 can adopt. In addition, the corner portion of the container main body 4 is particularly stretched so that the metal foil becomes thin, so that no small cracks or pinholes are generated in the metal foil.

The laminated film (1) forming the container body (4) is a laminated film in which a metal foil and a deposition layer having a thermoplastic resin layer in the innermost layer are laminated.

In the first embodiment, the laminated film 1 has a deposited layer on only one side of the metal foil. The laminated film 1 becomes the innermost layer of the container body 4 in the deposited layer.

It is preferable that the laminated film (1) used in the first embodiment is formed by laminating a protective layer made of resin on the side opposite to the side where the metalized foil is laminated.

The protective layer prevents the outer surface of the metal foil from being corroded by water or an electrolytic solution, or the outer surface of the metal foil from being damaged by contact with other articles. The protective layer is preferably formed of a thermoplastic resin having a melting point higher than that of the deposition layer, or a thermosetting resin.

Specific examples of the laminated film 1 include a protective layer formed of a resin such as polyester such as polyethylene terephthalate or polybutylene naphthalate or polyamide such as 6 nylon or 66 nylon, A metal foil such as aluminum, and a deposition layer formed of a polyolefin such as polyethylene or polypropylene in this order.

The protective layer is preferably a biaxially stretched film because heat resistance and strength are increased, and a plurality of layers may be laminated.

A known method such as dry lamination, extrusion lamination or thermocompression lamination can be used for the lamination of the respective layers constituting the laminated film (1).

The metal foil of the laminated film (1) functions as a gas barrier layer for imparting gas barrier properties such as oxygen and water vapor to the laminated film (1). Examples of the metal foil include aluminum foil, aluminum alloy foil, stainless steel foil, iron foil, nickel foil, copper foil and conductive foil.

Of these metal foils, an aluminum foil or an aluminum alloy foil is preferable in that it has a small specific gravity and excellent ductility (easiness of drawing) and thermal conductivity. Use of a metal foil excellent in thermal conductivity improves heat dissipation when the battery element generates heat. When the aluminum foil is used, the thickness of the aluminum foil is preferably in the range of 6 to 200 mu m from the viewpoints of ensuring the gas barrier property, machining suitability and the like. If the thickness of the aluminum foil is less than 6 占 퐉, generation of pinholes is increased and gas barrier properties are likely to be lowered.

The stainless steel foil has lower thermal conductivity than aluminum foil, but is superior in terms of tensile strength and corrosion resistance. The metal film having a high corrosion resistance is damaged by the deposition of the inner side of the metal foil in the container main body 4 so that the electrolytic solution filled in the battery container 10 is not corroded even if it comes in contact with the metal foil, . In the case of using a stainless steel foil, an austenitic stainless steel such as SUS304 or SUS316 excellent in corrosion resistance is preferable. As the stainless steel foil, SUS316 is particularly preferable. The thickness of the stainless steel foil is preferably in the range of 10 mu m to 150 mu m.

If the thickness of the stainless steel foil is less than 10 占 퐉, generation of pinholes is increased, and gas barrier property is lowered. When the thickness of the stainless steel foil is more than 150 mu m, it is difficult to process because the rigidity is high.

Examples of the resin used for the deposition layer of the laminated film 1 include high density polyethylene, medium density polyethylene, low density polyethylene, linear low density polyethylene, ethylene-acrylic acid copolymer, ethylene-methacrylic acid copolymer, Polyethylene (PE) type resins such as acrylate copolymer, ethylene-methyl acrylate copolymer, ionomer, ethylene-vinyl acetate copolymer and carboxylic acid modified polyethylene; And polyolefins such as polypropylene (PP) type resins such as propylene homopolymer, propylene-ethylene random copolymer, ethylene-propylene block copolymer, propylene-alpha-olefin block copolymer and carboxylic acid-modified polypropylene .

4, the film packaging cell 20 is housed in the container main body 4 of the battery container 10 and is sealed with the lid material 3. The lid member 3 is welded to the lid member bonding surface of the concave wall 43, the lid holding portion 44 and the electrode lead 47. The lid holding portion 44 and the lid member 3 are welded together with the electrode lead 47 sandwiched therebetween.

The laminated film 1 is bent at the upper end of the end wall 42 and extends outwardly of the container main body 4 in the lid holding portion 44 of the container main body 4. [

The lid member 3 is welded to the upper end surface of the concave wall 43 and the lid holding portion 44 to sandwich the electrode lead 47 and to close the opening of the container main body 4. [

In the first embodiment, a member having the same lamination structure as that of the laminated film 1 of the container main body 4 is used as the lid member 3.

In the first embodiment, the lid material 3 has the same width as the container body 4. [ Therefore, the upper end of the concave wall 43 of the container body 4 is covered with the lid material 3. Therefore, if the concave wall 43 has a sufficient thickness, the container body 4 and the covering material 3 are welded with a sufficient welding width, so that the welding strength is high and the gas barrier property of the weld interface is enhanced .

The lid member 3 may be formed to be wider than the width of the container main body 4 so that the side edge portions of the container main body 4 may be covered by the lid member 3 protruding from the container main body 4. [ In this case, it is preferable that a part of the lid member 3 is fixed to the outer surface of the concave wall 43.

The constitution of the laminated film used for the covering material 3 may not be the same as the laminated constitution of the laminated film 1 of the container body 4. [ In the case where the lid material 3 is a laminated film having a metal foil and a deposited layer, the film packaging battery 20 can be made lighter and the volume ratio is increased, which is preferable. However, when a thick resin plate having gas barrier property equivalent to that of a metal foil is used as the covering material 3, a metal foil may not be used.

When the lid material 3 is a laminated film having a metal foil and a deposited layer, it is preferable that the same protective layer as the laminated film 1 is laminated on the lid material 3.

As shown in Figs. 1 to 3, the sidewalls 43, 43 of the container body 4 are formed with a recess 45 on the outer surface thereof, and drawing-formed so that the storage portion side is convex. The laminated film (1) constituting the side wall (43) faces the deposited layer toward the receiving portion side.

2 and 3, the side wall 43 includes a folded portion 43a in which the laminated film 1 is folded from the side edge portion of the bottom portion 41 to the receiving portion side, a folded portion 43a, An upper extension projection 43c extending outwardly from the upper edge of the rising section 43b and an upper extension projection 43b extending outward from both ends in the longitudinal direction of the rising section 43b And an end extension projection 43d (see Fig. 2 (b)) which is extended and projected.

The folded portion 43a is superimposed on the bottom portion 41. As shown in Fig. It is preferable that the welded layer of the folded portion 43a is welded to the welded layer of the bottom portion 41 so that the folded portion 43a is fixed to the bottom portion 41. [

The concave portion 45 on the outer surface of the side wall 43 is formed by the folded portion 43a, the rising portion 43b, the upper extending portion 43c and the end extending portion 43d.

It is preferable that the depth of the concave portion 45 is such a depth as to secure a width of the welded portion between the lid member 3 and the end wall 42 of about 2 to 5 mm. When the width of the welded portion is 2 mm or more, the weld strength with the lid member 3 and the end wall 42 and the gas barrier property at the welded portion interface are enhanced.

On the other hand, even if the width of the welded portion exceeds 5 mm, further improvement of the weld strength and the gas barrier property can not be expected, and the capacity efficiency of the battery container 10 is lowered.

It is preferable that a plate-shaped resin molded body 2 in which a reinforcing resin is filled and laminated is formed in the inside of the concave portion 45. The resin molded body 2 is provided with the folded portion 43a of the concave portion 45 of the side wall 43, the upper extending projection 43c and the end extending projection 43d on both sides, It is preferable that the shape is a tangent shape.

In the first embodiment, the resin molded body 2 has a rectangular plate shape having a lower end surface on the side of the bottom portion 41, an upper end surface on the opening portion side, and side end surfaces at both ends in the longitudinal direction. The lower end face is in contact with the depression 43a and the side end face in the longitudinal direction is in contact with the end extension projection 43d so that the upper end faces the upper extension projection 43b, (43c).

In the present specification, the " main surface " means the widest surface among a plurality of surfaces.

As the resin used for the resin molded article 2, a resin usable as a protective layer of the laminated film 1 can be used. The resin used for the resin molded article 2 is preferably the same resin as that of the protective layer of the laminated film 1, but different resins may be used.

The resin used for the resin molded body 2 does not necessarily have to be bonded to the protective layer of the laminated film 1 with a high bonding strength.

It is preferable that the thickness of the resin molded article 2 is as thin as the desired beam formation can be obtained. If the resin molded article 2 is thick, the battery container 10 becomes heavy and the volume efficiency is lowered.

The resin molded body 2 can be made lightweight by forming a concave portion along the longitudinal direction of the laminated film 1 on the outer surface thereof.

In the first embodiment, the end wall 42 of the container body 4 shown in Fig. 1 is not reinforced by a resin plate, and is substantially composed of the laminated film 1.

Both ends of the end wall 42 are welded to the end extending projection 43d of the side wall 43 as shown in Fig. 2 (b). Thus, the end wall 42 is fixedly connected to the side wall 43, and the peripheral wall of the container body 4 is formed to form a watertight structure. Also, even if the end wall 42 is not reinforced by the resin plate, the end extension projection 43d reinforces the shape of the end wall 42.

Since the end wall 42 is welded to the outer surface (side end face) of the end extending projection 43d of the side wall 43 having a sufficient thickness, the lowering of the gas barrier property at the welded portion is small.

An example of manufacturing one independent container body 4 as an example of a method of manufacturing the battery container 10 of the first invention will be described with reference to Figs. 5 to 13. Fig. The production of the battery container 10 according to the first invention is carried out in the order of, for example, steps (1) to (4) as follows.

≪ (1) Drawing forming process >

As shown in Fig. 5, concave portions 45 are formed on both side portions of the laminated film 1 by drawing-forming. The recess 45 may be formed by, for example, drawing molding using a mold of an injection molding machine.

In addition, according to the procedure described below, the concave portion 45 is formed by drawing-forming using a mold of an injection molding machine, and then the reinforcing resin is filled in the concave portion 45 to form the resin molded article 2 (See Fig. 6 and Figs. 8 to 11).

8 is a schematic sectional view showing an example of a mold of an injection molding machine used for drawing forming processing.

8 includes a male die 71 having a core 71a corresponding to the inner surface shape of the recess 45 and a female die 72 having a cavity 72a corresponding to the outer shape of the side wall 43 .

A flow path 75 (spool, runner) for guiding the molten resin 73 (see FIG. 10) supplied from the injection molding nozzle 74 is formed in the male mold 71.

A molding space 76 (see Fig. 9) is formed between the core 71a of the male mold 71 and the cavity 72a of the female mold 72. [

A sliding hole 62 for slidably accommodating the pressing portion 60 is formed in the peripheral edge portion 78 of the male die 71 outside the core 71a. 9, the pressing portion 60 is elastically supported by the pressing means 61 so that the laminated film 1 inserted between the male die 71 and the female die 72 It is possible to press against the peripheral edge portion 79 of the female mold 72 side.

It is preferable that the abutment surface 60a of the pressing portion 60 in contact with the laminated film 1 is a smooth surface in order to reduce the friction with the laminated film 1. [

The core 71a of the male die 71 can be pressed to press the laminated film 1 in a temporary mold.

The pressurizing means 61 is accommodated in a pressurizing means accommodating space 63 formed in communication with the sliding hole 62. When the laminated film 1 is pressed against the male mold 71 and the female mold 72 (Upward and downward directions in Figs. 8 to 11).

The laminated film 1 in a state in which it is pressed by the pressing portion 60 is allowed to move toward the molding space 76 by a force received from the male die 71 or the resin 73 or the like. That is, the pressing force by the pressing portion 60 is within the limit of the tensile strength of the laminated film 1, and when a force stronger than the pressing force is applied to the laminated film 1, 60, respectively.

The pressing means 61 is preferably capable of applying an elastic pressing force to the laminated film 1, and a spring, an air cylinder, or the like can be used.

As shown in Figs. 9 and 10, the bottom surface 62a of the sliding hole 62 becomes a position for receiving the pressing portion 60 when the mold is temporarily closed, 10).

In order to mold the laminated film 1 by using the mold 70, first, as shown in Fig. 8, the laminated film 1 is disposed between the male die 71 and the female die 72 which are separated from each other.

9, the laminated film 1 is sandwiched between the male die 71 and the female die 72. Then, as shown in Fig. A part of the laminated film 1 is pressed by the core 71a and deformed into a concave shape along the shape of the core 71a in the molding space 76. [

The molten resin 73 is injected from the injection molding nozzle 74 into the molding space 76 formed between the core 71a of the male mold 71 and the cavity 72a of the female mold 72, . The laminated film 1 is pressed toward the surface of the cavity 72a of the female mold 72 and is deformed along the surface of the cavity 72a by the injection pressure of the molten resin 73 so that the concave portion 45 is formed do. The molten resin 73 is filled in the inner surface of the concave portion 45 (injection molding). In this embodiment, the molten resin 73 has a concave portion along the core 71a.

The laminated film 1 subjected to the pressure of the molten resin 73 is pressed against the pressing portion 60 and the female mold 72 because the pressing force of the pressing portion 60 is sufficiently small as compared with the force for deforming the laminated film 1. [ And is drawn toward the molding space 76 side.

When the molten resin 73 is cooled, the molten resin 73 is hardened to become the resin molded body 2. The resin molded article 2 is integrated with the laminated film 1.

11, when the female mold 72 is moved in the direction away from the male mold 71, the laminated film 1 is pressed from the male mold 71 by the pressing portion 60, The film 1 can be easily released.

≪ (2) Film notch process >

As shown in Fig. 7, leaving the portion where the concave portions 45 and 45 of the laminated film 1 formed with the resin molded article 2 are formed in the draw-formed concave portions 45 and 45 shown in Fig. 6, The lateral side portions 43 and 43 are cut out by cutting the lateral side portions including the four corners of the film 1 (the unnecessary lateral side portion 48 in Fig. 6) up to the end extending projection 43d.

As a method for cutting off the side portion of the laminated film 1, for example, a known method such as a method of using a punching die or a cutting method using a laser beam can be adopted. 7, the laminated film 1 is sandwiched between the side walls 43, 43 and the concave portions 45, 45 to form a central portion 46 And free ends 53 and 53 extending outward from the central portion 46 and serving as the end wall 42 and the lead nip portion 44. [

The free end 53 is a portion without the side wall 43 with respect to the longitudinal direction of the laminated film 1.

In the present specification, the term " free end " means an end that can freely move.

≪ (3) Step of rising the concave wall and the end wall >

The laminated film 1 in which the openings of the concave portions 45 are oriented downward and the laminated film 1 in which the concave portions 45 and 45 are formed by drawing is folded to form a folded portion 43a (bottom portion of the central portion 46). 13, the concave wall (sidewall) 43 rises over the central portion 46 serving as the bottom portion 41. As shown in Fig.

The deposition layer of the folded portion 43a of the laminated film 1 having the recesses 45 and 45 and the deposited layer of the laminated film 1 of the central portion 46 are heated from the bottom portion 41 side Respectively.

As a result, the portion including the pair of concave portions 45, 45 of the laminated film 1 becomes the concave walls (side walls) 43, 43 formed so as to stand so that the deposited layers of the convex are opposed to each other ).

The free ends 53 and 53 are disposed on the bottom of the end extension projection 43d of the side wall 43 in a state in which the side wall 43 shown in Fig. 13 is raised on the central portion 46, And the end walls 42 and 42 are formed (see Figs. 1 and 2).

≪ (4) Connection process of wall surface >

The side edges 42 and 42 of the formed end walls 42 and 42 are superimposed on the respective end extending projections 43d of the concave walls 43 and 43 to form the welded layers of the end walls 42 and the end extended projections 43d The welded layers are heated from the end wall 42 side and welded to each other.

A portion of the free ends 53 and 53 rising from the central portion 46 and becoming the same height as the side wall 43 becomes the end walls 42 and 42 and the remaining portion becomes the lead holding portions 44 and 44 . The end walls 42 and 42 are formed so as to stand so that the deposited layers face each other (see FIG. 2).

The remaining part of the free end 53 protruding from the end wall 42 is horizontally bent outward to form the lead holding portion 44. The wall surface of the end wall 42 and the side wall 43 are welded The battery container 10 of the first embodiment shown in Fig. 1 is obtained as the peripheral wall of the container body 4 in connection with each other.

The formation of the lead-gripping portions 44 may be performed simultaneously with the formation of the end walls 42. [

After the battery element 5 is placed in the obtained battery container 10 and the lid material 3 is placed in the opening portion, the upper end surface of the resin molded body 2 of the battery container 10 and the lid holding portion 44 , And the lid member (3) is welded to the electrode lead (47). When the electrode lead 47 is sandwiched between the lid member 3 and the lid holding portion 44 and the opening of the battery container 10 is closed in this way, (20) is obtained.

According to the method of manufacturing the battery container and the film packaging battery according to the present invention, the battery container 10 and the film packaging battery 20 of the first embodiment are manufactured continuously and efficiently using the long laminated film (1) It is possible. In the present invention, the term " long " means that the length is from 1 m to 10,000 m.

Hereinafter, an example of the manufacturing method will be described with reference to Figs. 14 to 21. Fig.

The method of manufacturing the battery container 10 of the first embodiment using the long laminated film 1 is substantially the same as the manufacturing method of one independent container body 4 described above.

Only the processes different from the manufacturing method of one independent container body 4 will be described below.

The method of manufacturing the battery container 10 of the first embodiment in the case where the long laminated film 1 is used is carried out through the steps (a) to (g) as follows.

≪ (a) Drawing forming process >

14, recesses 45 are formed on both side portions of the long laminated film 1 by drawing molding, and the reinforcing resin is filled in the recesses 45 to form the resin molding 2, .

The method of forming the concave portion 45 is the same as the method of forming the concave portion 45 in the manufacturing method of one independent container body 4. [ The lamination method of the resin molded article 2 is also the same as the lamination method of the resin molded article 2 in the manufacturing method of one independent container body 4 (see Figs. 5 to 11).

The concave portions 45 are formed between concave walls 43 and 43 (also referred to as " concave walls ") 43, which are adjacent to each other in the longitudinal direction of the long laminated film 1, 15 and the like) (the side edge of the end wall 42).

≪ (b) Electrode opening step >

The elongated laminated film 1 is provided with an opening 50 (electrode lead-out portion) for exposing the electrode lead 47 serving as an electrode.

The opening 50 is intended to directly apply the band of the container body 4 obtained by the process of connecting the wall surface to be described later to the method for manufacturing the film packaging battery 20.

As a method for forming the opening 50, for example, a method of using a punching die or a method using a laser beam may be employed.

When the film packaging battery 20 is manufactured by cutting out a plurality of the container bodies 4 independent of the belt of the container body 4 formed on the long laminated film 1, the openings 50 may be omitted.

The opening 50 can be formed at any stage of the manufacturing process of the container main body 4. However, when the opening 50 is formed in the film notch process to be described later, the positions of the notch portion and the opening 50 of the film become correct. In addition, when the openings 50 are formed in the film notch process, the notch portions and the openings 50 of the long laminated film 1 are both operations for cutting off the film, so that the work is efficient and preferable.

≪ (c) Film notch process >

15, in the same manner as in the film notch process in the manufacturing method of one independent container body 4, a long laminated film 1 in which a plurality of pairs of recesses 45, 45 are formed by drawing is formed, Leaving a plurality of pairs of concave portions 45 and 45 of the long laminated film 1 to be free ends and part of the side edges of the long laminated film 1 (the unnecessary side edge portions 48 in Fig. 14) is cut out.

17, the long laminated film 1 from which the unnecessary lateral side portions 48 are cut is sandwiched between the pair of side walls 43, 43 and the plurality of pairs of concave portions 45, 45, And a portion 49 extending outwardly from the central portion 46 and serving as the end wall 42 and the lead nip portion 44. As shown in Fig.

17, the portion 49, which will be the end wall 42 and the lead nip portion 44, has the connecting portion 51 having the opening 50, the lead nip portions 44, 44 and the end walls 42, 42).

Therefore, the length between the portions to be the bottom portions 41 of the plurality of container bodies 4, that is, the length of the portions 49 that become the end walls 42, 42 and the lead gripping portions 44, 44 Is longer than the length of the portion that becomes the end walls (42, 42) as long as the length of the lead gripping portions (44, 44) and the opening (50).

It is preferable that the width of the connection portion 51 and the end wall portion 52 is equal to the width of the bottom portion 41. [

Referring to Fig. 17, the shape of the elongated laminated film 1 which has been subjected to the opening process of the electrode lead opening (electrode opening process) and the film notch process will be described in detail.

Two chain double-dashed lines 1a and 1a extending outwardly from an end edge of the opening 50 of the long laminated film 1 are imaginary lines to be cut to cut and remove the connecting portion 51. The sections to be cut 1a and 1a cut the connecting section 51 which is to sandwich the completed container body 4 or the strips to which the film packaging battery 20 is connected by two pairs of lines 1a and 1a Remove and separate. The widths of the two pairs of lines to be cut 1a and 1a may be narrower than the width of the opening 50 as long as the connecting portion 51 can be cut off.

The two-dot chain line 1b connecting the end extension portions 43d is a boundary line between the central portion 46 serving as the bottom portion 41 and the end wall dividing portion 52. The boundary line 1b is folded inward when the laminated film 1 of the end wall preliminary portion 52 is welded to the side wall 43 to form the end wall 42. [

The two-dot chain line 1c between the boundary line 1b and the line along which the object is to be cut 1a and 1a is connected to a portion that becomes the end wall 42 of the end wall pre- . The boundary line 1c is folded outward when the end wall 42 is formed.

14 to 21 show an example in which two battery containers 10 continuous to the long laminated film 1 are formed, but usually three or more battery containers 10 are formed.

In the first embodiment, not only the portion between the end wall defining portions 52 and 52 but also the portion further closer to the end than the end wall defining portion 52 located at the end side of the long laminated film 1, (51).

≪ (d) Rising Step of Concave Wall and End Wall >

16, the elongated laminated film 1 is folded in such a manner that the opening of the concave portion 45 is located at the lower side of the container body 4 in the same manner as the step of raising the concave wall and the end wall in the manufacturing method of one independent container body 4, The elongated laminated film 1 in which a plurality of pairs of recesses 45 and 45 are formed by drawing is folded so as to rise from the bottom portion of the engaging portion 43a to the central portion 46, The concave wall is erected as shown in Fig.

The folded portion 43a and the central portion 46 of the long laminated film 1 in which the plural pairs of the recesses 45 and 45 are formed are heated and welded from the central portion 46 side. As a result, a plurality of concave walls (side walls) 43 are formed.

It is also folded inward vertically along the two-dot chain line 1b shown in Fig. 17 and folded out horizontally along the two-dot chain line 1c to lift up the connecting portion 51 and the end wall dividing portion 52, The end wall 42 of the laminated film 1 is brought into close contact with the end extending projection 43d of the concave wall (side wall) 43 (see Fig. 19).

≪ (e) Connection process of wall surface >

The side edge portions of the elongated laminated film 1 are formed as the end extending projections 43d and 43d of the concave wall (side wall) 43 in the same manner as the connecting process of the wall surface in the manufacturing method of one independent container body 4 A plurality of container bodies 4 are formed on the long laminated film 1 shown in Fig. 19 and are connected to the connection portions 51 of the battery container 10 A band is obtained.

Further, when the connecting portion 51 of the band of the battery container 10 formed on the long laminated film 1 is cut off and separated, the battery container 10 of the first embodiment shown in Fig. 1 is obtained.

The band of the battery container 10 formed on the long laminated film 1 may be used for manufacturing the film packaging battery 20 without being divided.

Next, a method of manufacturing the film packaging battery 20 in which the strip of the battery container 10 formed on the long laminated film 1 is not divided will be described.

The method for manufacturing the film packaging battery 20 of the first embodiment is a method of manufacturing the battery container 10 of the present invention in which the storing step and the sealing step of the battery element are added. Hereinafter, the storing process and the sealing process of the battery element will be described.

≪ (f) Storing Step of Battery Element >

20, the method for manufacturing the film packaging battery 20 of the first exemplary embodiment is such that the container body 10 of each battery container 10 of the band of the battery container 10 formed on the long laminated film 1 The battery element 5 is housed in the housing 4.

When the battery element 5 is housed in the container main body 4, the respective ends of the positive electrode lead and the negative electrode lead protruding from the container main body 4 of the battery container 10 in the opposite directions are connected to the opening 50).

<(G) Encapsulation process>

As shown in Fig. 21, in the first embodiment, a long lid member 3 to which a plurality of lid members 3 are connected is used. This cover member 3 has a connecting portion 31 having an opening 30 like the connecting portion 51 of the band of the battery container 10 formed in the long laminated film 1. [ The size of the opening 30 may be different from the connecting portion 51 of the band of the battery container 10 formed in the long laminated film 1, but it is preferably the same. Further, a plurality of independent cover members 3 may be used.

The connecting portion 31 of the long lid 3 used in the first embodiment is the same in width and length as the connecting portion 51 of the band of the container body 4 formed in the long laminated film 1, The openings 30 having the same shape as that of the openings 50 are formed at the same interval as the openings 50. Normally, the lengths of the strips do not have to coincide.

The covering material 3 is formed so that the opening 50 of the band of the battery container 10 formed in the long laminated film 1 accommodating the battery element 5 coincides with the opening 30 of the long lid material 3, And on both the welding layer of the upper extending projection 43c of the side wall 43 of each container body 4 and the welding layer of the lid gripping portion 44 from the lid material 3 side, The deposition layer of the ash 3 is welded.

When the leads are sandwiched between the lid member 3 and the lid holding portions 44 of the respective battery containers 10 and the openings of the battery containers 10 are closed, , A band in which a plurality of packaging cells 20 are formed on the long laminated film 1 is obtained.

When the connecting portions 31 and 51 of the strips in which the plurality of film packaging cells 20 are formed on the long laminated film 1 are cut off and removed, the film packaging battery 20 shown in Fig. 4 is completed.

The strip formed of the plurality of film packaging cells 20 in the long laminated film 1 may be a finished product as it is.

The battery container 10 according to the present invention manufactured in this manner is similar to the battery container using the draw-formed container except that the bottom portion 41 of the container main body 4 and the laminated film 1 ), The cell container 10 has a high gas barrier property, a light weight, and a high volume efficiency. In addition, unlike the battery container using the draw-formed container, the concave wall 43 constituting the peripheral wall of the container body is welded and connected to the end wall 42. Therefore, even if the container body 4 is deep, Can be formed and the formation of the beam is excellent. Further, the battery container 10 can be produced by folding the laminated film 1 including the metal foil with a folding line to produce a battery container having an arbitrary depth.

Therefore, even when the battery container 10 according to the present invention accommodates a large-capacity battery element 5, it is not necessary to perform deep drawing in a three-dimensional shape. Therefore, even if the metal foil is thin, cracks or pinholes are not generated in the metal foil Do not.

In addition, the battery container 10 according to the present invention has a drawability lower than that of a metal foil when the thickness of the metal foil is thinned, or a laminate film using a metal foil which is not suitable for drawing due to its small extensibility Can also be used.

Since the lid material 3 is welded to the concave wall 43 of the battery container 10 according to the present invention, at least opposite sides of the film packaging battery 20 are covered with the lid material 3 in a concave shape It can be welded to the upper extension projection 43c of the wall 43 and sealed. As a result, the fused portion of the lid member 3 does not protrude outward from the battery container 10, so that the battery becomes compact, and the volume of the integrated body can be reduced when a plurality of battery containers are used for integration. Therefore, handling of the plurality of battery containers during storage and accumulation is also excellent.

Further, since the battery container 10 according to the present invention has the concave shape of the concave wall 43, it is possible to sufficiently increase the seal width at the time of melting the lid material 3. Therefore, the deposition is easy and reliable, and the gas barrier property of the welded portion interface is also enhanced.

Since the welded layer of the folded portion 43a of the concave wall 43 is welded to the welded layer of the bottom portion 41 in the battery container 10 according to the present invention, The deposition of the welding layer of the end extension projection 43d of the concave wall 43 and the welding layer of both side edges of the end wall 42 is easy and reliable. In addition, in the battery container 10, since the concave portion 45 of the concave wall 43 is filled with the reinforcing resin and the resin molded body 2 is laminated, the beam forming is more excellent.

Further, according to the method of manufacturing the battery container 10 according to the present invention, it is possible to continuously form the plurality of container bodies 4 by using the long laminated film 1. As a result, while the long laminated film 1 or the recessed portion 45 wound by a roll, a bobbin winding, or a cassette winding is rewound by drawing the elongated laminated film 1, the battery container or the film packaging battery is continuously Can be manufactured. Therefore, the manufacturing method of the battery container 10 according to the present invention can increase the production efficiency.

&Lt; Example 2 &

22 shows the battery container 110 of the second embodiment.

The battery container 110 of the second exemplary embodiment differs from the battery container 10 of the first exemplary embodiment in that a frame body in which the central portion of the resin molded article 2 is cut is used.

The battery container 110 of the second exemplary embodiment can be manufactured in the same manner as the first exemplary embodiment except that the resin molded body 2 is formed to be a frame body by, for example, injection molding.

Since the battery container 110 of the second embodiment is a frame body, the weight of the battery container 110 can be reduced.

&Lt; Example 3 &

23 shows the battery container 120 of the third embodiment.

The battery container 120 of the third embodiment differs from the battery container 10 of the first embodiment in that the bottom surface of the concave wall 43 is formed to be shorter than the top surface.

The battery container 120 of the third embodiment is formed such that the end extension projections 43d and 43d of the concave wall 43 are inclined at an acute angle with respect to the upper extension projection 43c. As a result, the concave wall 43 has a trapezoidal shape.

The battery container 120 of the third embodiment is formed in the same manner as in the first embodiment except that the concave wall 43 is folded so that the length of the engaging portion 43a is shorter than the length of the upper extending portion 43c Can be produced.

Since the end extending projection 43d of the concave wall 43 is inclined at an acute angle with respect to the upper extending projection 43c, the bottom portion 42 of the end wall 42 41 and the lead nip portion 44 are small.

Therefore, even when the laminated film 1 has high rigidity, peeling of the end wall 42 from the concave wall 43 and the covering material 3 is hardly caused. Therefore, the battery container 120 of the third embodiment is preferable in the case of using a stainless steel foil having high rigidity as the gas barrier layer for the laminated film 1 or the covering material 3.

Since the opening portion of the container body 4 is wider than the bottom portion 41, workability is good when the battery element 5 is housed.

In addition, since the angles of the tips formed by the upper and lower extending projections 43c and 43d of the concave wall 43 become smaller, it is advantageous in airtightly welding the lid material 3.

&Lt; Example 4 &

Fig. 24 shows a battery container 130 of the fourth embodiment.

In the battery container 130 of the fourth embodiment, the end extending projection 43d of the concave wall 43 is formed so that an inclination angle (inclination angle with respect to the upper extending projection 43c) is folded from the upper extending projection 43c to the folded portion 43a in the direction of the arrows.

In this case, since the angle formed by the upper extension projection 43c and the end extension projection 43d of the concave wall 43 is reduced, the lid material 3 is advantageously airtightly welded. In addition, since the inclination angle of the end extending projection 43d is large in the lower portion of the battery container 130, a high volume ratio can be ensured.

Conversely, the end extension projection 43d of the concave wall 43 may be curved so that the inclination angle approaches 90 degrees as it is folded from the depression 43a toward the upper extension projection 43c.

The concave wall 43 does not necessarily need to be formed by inclining the both end extension projections 43d and 43d and one of the end extension projections 43d and 43d is formed at an acute angle And the other end may be formed perpendicular to the upper extension projection 43c as in the first embodiment.

Although the embodiments of the present invention have been described with reference to the drawings, the present invention is not limited to these embodiments, and various modifications are possible without departing from the gist of the present invention.

As described above, in the battery containers 10, 110, 120, and 130 of the first to fourth exemplary embodiments, the resin molded body 2 is laminated on the concave portion 45 of the concave wall 43 The resin molded body 2 may not be laminated in the concave portion 45 as long as the desired beam forming can be ensured.

The shape of the resin molded body 2 is not limited to the example described above. The shape of the resin molded body 2 may be a bridge shape such as two or three or more bridge columns and a bottom plate used in the structure of the bridge.

Although the electrode leads of the positive electrode and the negative electrode extend and protrude in opposite directions to each other, the electrode leads of the positive electrode and the negative electrode may extend and protrude from one side in the same direction.

One… Laminated film, 2 ... Resin molding, 3 ... Cover material, 4 ... Container body, 41 ... (Of the container body), 42 ... (Of the container body), 43 ... (Sidewall) of the container body (of the container body), 44 ... (Of the container body), the nose of the lid, 45 ... The recess, 47 ... Electrode lead, 5 ... Battery element, 10, 110, 120, 130 ... Battery container, 20 ... Film wrapping battery, 50 ... The opening, 70 ... mold.

Claims (4)

1. A battery container having a container body and a lid material, the container body comprising a laminated film having a deposition layer on one surface of the metal foil and a protective layer on the other surface of the metal foil,
Wherein the peripheral wall of the container main body is formed by four wall surfaces that are folded and folded from a square bottom portion by folding lines and welded to each other,
Wherein a pair of opposed wall surfaces of the four wall faces are drawn and formed so that the deposited layer of the laminated film is convex toward the housing portion and a concave portion is formed on the outer face. delete The method according to claim 1,
Wherein the concave portion is filled with a reinforcing resin. A film packaging battery using the battery container according to any one of claims 1 to 3,
Wherein the battery element is housed in the container body and is sealed with the cover material.

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