KR101853673B1 - Battery casing, film packaging battery, and methods for manufacture thereof - Google Patents

Abstract

The present invention provides a battery container, a film packaging battery using the same, and a method of manufacturing the same. The present invention relates to 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 has a wall surface folded up from a square bottom, And the battery cells are connected by welding.

Description

TECHNICAL FIELD [0001] The present invention relates to a battery container, a film packaging battery, and a method of manufacturing the same. BACKGROUND OF THE INVENTION 1. Field of the Invention [0001]

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

BACKGROUND ART [0002] Conventionally, metal containers having excellent water vapor permeability have been widely used as battery containers for accommodating battery elements such as lithium ion secondary batteries and electric double layer capacitors (all charging / power generating elements including electrolytes). However, metal containers are heavy, bulky, and complicated in packaging process, resulting in low productivity. In particular, welding of the container body and the lid body requires a large number of process steps, which is also problematic from the viewpoint of mass productivity. In addition, lithium batteries for electric vehicles and the like are often loaded on vehicles, so that containers are desired to be light and compact.

With respect to this demand, a pouch type in which a laminate composed of a base layer, a metal foil such as aluminum and a sealant layer is formed in a bag shape, or a pouch type in which the laminate is press molded to form a concave portion, (Also referred to as " drawing processing type ") and the like (see, for example, Patent Documents 1 and 2).

Drawing process type battery containers can be accommodated even in a somewhat thick battery element, and the battery device can be easily packed and packaged, the capacity efficiency (ratio of the volume to the total volume of the battery container) is high, Is low.

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, in a battery container of the drawing type, when a slip agent, a liquid paraffin layer or the like is used, the lubricating property of the surface of the mold and the packaging material is improved. 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 about 10 mm. For this reason, there has been a problem that it is impossible to accommodate a large-capacity thick battery element.

Further, since the corner portion is particularly strongly stretched, the metal foil becomes thin or a large number of pin holes are generated in the metal foil. When moisture enters from the thin portion of the metal foil or the pin hole, it reacts with the electrolytic solution to generate hydrofluoric acid or the like. As a result, there has been a problem that the welded portion of the electrode member or the like deteriorates and the electrolyte solution leaks.

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 device which is light in weight, volume efficient, A battery pack capable of being designed to have an arbitrary thickness, a film packaging battery using the same, and a manufacturing method of these batteries with high manufacturing efficiency.

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 deposition layer, wherein the peripheral wall of the container main body has a wall surface rising from the folded square bottom, And is welded and connected.

(2) The battery container described in (1), wherein the resin molded article is a plate body, and the side surface of the plate body is a cover material fusing surface.

(3) The battery container of the plate chain (2), wherein the resin molded article has an extension portion at which the wall surface is welded at both ends.

(4) The battery container of (1), wherein the resin molded body is a frame body and the upper surface of the frame body is a cover material fusing surface.

The present invention provides the following process for producing a battery container.

(5) A method for manufacturing a battery container according to any one of (1) to (3), wherein a long resin plate, which is divided into a plurality of resin molded bodies, is welded to a welded layer on both sides of the long laminated film A resin plate welding step and a resin plate welding step in which the resin plate is left as a plurality of the resin molding bodies on opposite sides of the laminated film and the adjacent resin molding bodies are sandwiched between two adjacent resin molding bodies A step of cutting the resin molded body by cutting the resin plate and the laminated film so as to leave the laminated film longer than the length of the laminated film which is longer than the length of the laminated film to be welded to the surface of the resin molded body, And the laminated film contacting the lower end of the resin molded body is fused to the resin molded body to form a side wall A step of folding the portion of the laminated film in which the notched portion is present from the bottom of the resin molded body to stand the resin molded body and overlapping the resin molded body with the resin molded body to connect the wall surface of the container body, And a wall surface connecting step of forming a peripheral wall.

(6) A production method of a battery container according to any one of (1) to (4), characterized in that, on both sides of the elongated laminated film, The main body of the resin molded body is notched with the width of the main surface of the resin molded body such that the laminated film is longer than the length of the portion welded to the two opposing surfaces of the molded bodies, And a step of forming a notch portion so that side edges of the laminated film to be welded to the laminated film are unfolded outward as a plurality of free ends; A resin-molded body deposition step of depositing the resin-molded body on the deposited layer of the laminated film, And the free end is bent and erected from the bottom of the resin molded body so that the free end overlaps the resin molded body and is melted, and the wall surface of the container body is connected to the peripheral wall of the container body, And a wall surface connecting step of forming a wall of the battery case.

(7) A method for manufacturing a battery container as described in (5) or (6), further comprising an electrode opening step of forming an electrode lead-out portion made of an opening in the long laminated film.

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

(8) A film packaged battery using the battery container according to any one of (1) to (4), 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 film packaging battery.

(9) A method for producing a film packaging battery using the method for manufacturing a battery container according to any one of (5) to (7), comprising: a battery element receiving step of receiving a battery element in a battery container formed by the wall surface connecting step; And a sealing step of fusing a cover material to the opening of the battery container in this order.

According to the battery container and the film packaging battery of the present invention, since the bottom portion of the battery container main body and the peripheral wall are composed of the laminated film including the metal foil like the drawing type battery container, the barrier property of the battery container is high, Light weight, high volume efficiency. Furthermore, unlike the drawing-type battery container, since the peripheral wall is connected by the resin molding, the shape is excellent. Further, since the laminated film including the metal foil is folded by the folding line but is not drawn in the three-dimensional shape, even if the metal foil is thin, no cracks or many pinholes are generated in the metal foil. As a result, it is possible to freely design the depth of the battery container body, so that a thick battery element having a large capacity can be easily accommodated. In addition, a metal foil with low drawability which can not be used in a drawing-type container can be freely used by lowering the thickness so far, or a laminated film using a metal foil which is not suitable for drawing due to its small elongation.

Further, since the resin molded article has the covering material fusing surface, at least two opposing sides of the film packaging battery can be sealed by bonding the covering material to the resin forming body. As a result, the fused portion of the lid member does not protrude outward of the battery container, so that the battery becomes compact, and the volume of the integrated body can be reduced when a plurality of batteries are used for integration. In addition, handling of a plurality of cells during storage and accumulation is also excellent.

According to the method of manufacturing a battery container and a film packaging battery of the present invention, a plurality of battery container bodies are formed by using a long laminated film. As a result, the battery container and the film packaging battery can be continuously produced while rewinding the laminated film rolled up by the roll, the bobbin winding, or the cassette winding, or the laminated film formed by welding the resin molded article, thereby improving the production efficiency.

1 is a view showing a battery container according to a first embodiment; (a) is a perspective view, (b) is a cross-sectional view taken along line AA of FIG. 1 (a), and FIG.
2 is a perspective view showing a film packaging battery using the battery container of the first embodiment.
3 is a perspective view showing a part of the manufacturing process of the battery container of the first embodiment.
4 is a perspective view showing a part of the manufacturing process of the battery container of the first embodiment.
5 is a perspective view showing a part of the manufacturing process of the battery container of the first embodiment.
6 is a perspective view showing a part of the manufacturing process of the battery container of the first embodiment using the long laminated film.
7 is a perspective view showing a part of a manufacturing process of a battery container according to a first embodiment using a long laminated film.
8 is a plan view for explaining a long laminated film shown in Fig.
9 is a perspective view showing a part of a manufacturing process of a battery container according to a first embodiment using a long laminated film.
10 is a perspective view showing a part of a manufacturing process of a battery container of a first embodiment using a long laminated film.
11 is a perspective view showing a part of a manufacturing process of a film packaging battery using a battery container of the first embodiment produced using a long laminated film.
12 is a perspective view showing a part of a manufacturing process of a film packaging battery using a battery container of the first embodiment produced using a long laminated film.
13 is a view showing a battery container according to the second embodiment. (a) is a perspective view and (b) is a cross-sectional view in CC of Fig. 13 (a).
14 is a cross-sectional view showing another example of the resin molded article used in the second embodiment.
Fig. 15 is a perspective view showing a part of the manufacturing process of the battery container of the second embodiment. Fig.
16 is a perspective view showing a film packaging battery using the battery container of the second embodiment.
17 is a perspective view showing a part of the manufacturing process of the battery container of the second embodiment using the long laminated film.
18 is a perspective view showing a part of the manufacturing process of the battery container of the second embodiment using the long laminated film.
19 is a perspective view showing a part of a manufacturing process of a film packaging battery using a battery container of a second embodiment produced by using a long laminated film.
20 is a view for explaining a battery container according to the third embodiment; (a) is a perspective view showing a battery container of this embodiment, and (b) is a perspective view showing a film packaging battery using the battery container of this embodiment.
Fig. 21 is a view showing a part of the manufacturing process of the battery container of the third embodiment. Fig. (a) is a perspective view showing a state in which a resin plate is welded to a laminated film, and (b) is a perspective view showing a state in which a resin plate is cut to form a resin molding.
22 is a perspective view showing a part of a manufacturing process of a battery container according to a third embodiment using a long laminated film.
23 is a perspective view showing a part of a manufacturing process of a battery container according to a third embodiment using a long laminated film.
24 is a perspective view showing a part of a manufacturing process of a battery container according to a third embodiment using a long laminated film.
25 is a perspective view showing a part of a manufacturing process of a film packaging battery using a battery container of a third embodiment produced by using a long laminated film.
26 is a view showing a battery container according to a fourth embodiment; (a) is a perspective view showing a battery container of this embodiment, and (b) is a perspective view showing a film packaging battery using the battery container of this embodiment.
Fig. 27 is a perspective view showing a part of the manufacturing process of the battery container of the fourth embodiment; Fig.
28 is a perspective view showing a part of a manufacturing process of a battery container of a fourth embodiment using a long laminated film.
29 is a perspective view showing a part of a manufacturing process of a battery container according to a fourth embodiment using a long laminated film.
30 is a perspective view showing a part of a manufacturing process of a film packaging battery using a battery container of a fourth embodiment produced by using a long laminated film.

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 this embodiment shown in Fig. 1 houses the battery element 5 and becomes the film packaging battery 20 of this embodiment shown in Fig. The film packaging battery 20 of this embodiment is a secondary battery, an electric double layer capacitor, or the like.

In the film packaging battery 20 of this 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 present embodiment, 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 leads are mounted on the electrode plate and 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 shown in Figs. 1 (a) to 1 (c) has a container main body 4 made of a laminated film 1 having a metal foil and a deposited layer. In the battery container 10, the resin molded body 2 is welded to a welding layer on a pair of opposite sides of the container body 4. The battery container 10 includes a bottom portion 41 formed in a rectangular shape when viewed in a plan view, a pair of end walls 42 and 42 and side walls 43 and 43 rising from an end edge of the bottom portion 41, Shaped resin molded body 2 welded to the side wall 43 and a lead holding portion 44 extending outwardly from the end of the end wall 42.

The film packaging cell 20 shown in Fig. 2 houses the battery element 5 in the battery container 10 and is sealed with the lid material 3. The lid member 3 is welded to the lid member holding surface of the resin molded body 2 and the lid holding portion 44 at the opening of the container body 4. [ The leads are held in the lid holding portion 44 and the lid member 3.

The peripheral wall of the container main body 4 is folded by the folding lines formed by the straight walls of the end walls 42 and 42 and the side walls 43 and 43 so as to stand up from the square bottom 41, Respectively. Since the container body 4 is formed of the laminated film 1 in which the portion of the peripheral wall rising from the bottom portion 41 is folded by a folding line made of a straight line having no bent portion, it is necessary to draw the metal foil in a three- There is no.

Therefore, there is no limit to the depth of the container body 4, and the corner portion is particularly strongly stretched to thin the metal foil, and no cracks or many 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 deposited layer made of a thermoplastic resin are laminated on the innermost layer.

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

In the laminated film (1) used in the present embodiment, a protective layer made of resin is laminated on the side opposite to the deposition layer of the metal foil.

The protective layer prevents the metal foil from being corroded by water or electrolytic solution, or 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.

When the protective layer is biaxially stretched, heat resistance and strength are increased, so that a plurality of layers may be laminated.

For lamination of the respective layers, known methods such as dry lamination, extrusion lamination and thermo-compression lamination can be employed.

The metal foil of the laminated film (1) functions as a 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 foil, iron foil, copper foil and lead foil.

Of these, 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. When the thermal conductivity is excellent, the heat dissipation property when the battery element generates heat is improved. The thickness of the aluminum foil is preferably in the range of 6 to 200 mu m from the viewpoints of securing the 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 the barrier property may be lowered.

The stainless steel foil has lower thermal conductivity than aluminum foil but has high tensile strength and corrosion resistance. The metal foil having a high corrosion resistance is preferable because it can prevent the gas barrier property of the metal foil in the container body 4 from being corroded even if the electrolytic solution filled in the inside of the battery container 10 is damaged due to the damage of the inner- Do. When a stainless steel foil is used, austenite such as SUS304 and SUS316 excellent in corrosion resistance is preferable, and 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 the barrier property is lowered. When the thickness of the stainless steel foil is more than 150 mu m, the rigidity is high and processing is difficult.

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, (PE) resin or propylene homopolymer such as ethylene-acrylate copolymer, ethylene-methyl acrylate copolymer, ionomer, ethylene-vinyl acetate copolymer and carboxylic acid-modified polyethylene, propylene-ethylene random copolymer, ethylene- And polyolefins such as polypropylene (PP) type resins such as propylene block copolymers, propylene-alpha-olefin block copolymers and carboxylic acid-modified polypropylene.

As shown in Fig. 2, in the present embodiment, another member having the same lamination structure as that of the laminated film 1 is used as the lid member 3. The cover member 3 is integrated with the laminated film 1, and a part of the cover member 3 may be folded.

Since the ridgeline of the upper surface of the container body 4 in which the laminated film 1 is folded is covered with the laminated film 1 when the lid material 3 is integrated with the laminated film 1, Even if it is a thin plate, it is preferable because the decrease in the barrier property is small. It is also preferable that the ridge lines opposed to the ridge line on the upper surface of the container main body 4 on which the laminated film 1 is folded are covered with the laminated film 1. In this case, the width of the laminated film 1 is widened to form a deposited layer on the outer surface of the laminated film 1, and the protruding lid material 3 is welded to the outer surface of the side wall 43 of the container body 4 And then fixed.

In the present embodiment, the cover member 3 is made of another member having the same width as the laminated film 1. [ In this case, the ridge line on the upper surface of the container main body 4 is not covered with the lid material 3, but the lowering of the barrier property is usually small due to the thickness of the resin molded product 2.

The width of the lid member 3 is made wider than the width of the container body 4 when covering the ridge line on the upper surface of the container body 4 with the lid member 3, . Therefore, even if the resin molded article 2 is in the form of a thin plate, the lowering of the barrier property is small, which is preferable. In this case, it is preferable that a deposition layer is formed on the outer surface of the laminated film 1 so that the protruding lid member 3 is fixed to the outer surface of the side wall 43 of the container body 4 by welding.

When the lamination structure of the cover material 3 is different from the laminated film 1, it is preferable that the laminated film has a metal foil and a deposited layer. However, in the case of using a thick resin plate having a barrier property close to that of a metal foil, it is not necessary to have a metal foil.

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.

As shown in Figs. 1 (a) and 1 (c), the battery container 10 of the present embodiment is provided with a lid having the same length as that of the side wall 43 on the inner surfaces of the side walls 43 and 43 on both sides of the container body 4, The resin molded articles 2, 2 having the re-welding surfaces are welded together facing each other. The width of the resin molded body 2 is the same as that of the side wall 43.

In the present embodiment, the resin molded body 2 has a bottom end face on the side of the bottom portion 41 of the container body 4 and a top end face which becomes the cover material welding face on the opening end side, (Hereinafter, the " resin molded body 2 " may be referred to as " the plate body 2 " in some cases).

The main body of the plate body 2 is welded to the side wall 43 and the side end face in the longitudinal direction is welded to the end wall 42 and the lower end face is welded to the bottom portion 41. The upper end face of the plate body 2 becomes a welding face with the lid member 3. The plate body (2) does not have to be plate-shaped if it has these weld surfaces. For example, the center portion of the plate body 2 may be a cut-out frame, or a bridge shape such as a pier and a bottom plate of two or three or more bridges may be used.

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

As the resin forming the resin molded article 2, a resin which can be welded to the deposition layer of the laminated film 1 can be used. This resin is preferably the same as the resin of the deposition layer of the laminated film (1), but it may be used as long as it can be welded to the deposition layer of the laminated film (1).

The thickness of the resin molded article 2 is preferably 2 to 5 mm. When the thickness of the resin molded article 2 is 2 mm or more, the weld strength to the end wall 42 and the covering material 3 is excellent. Even if the connecting portion between the end wall 42 and the side wall 43 is not covered with the laminated film 1, the lowering of the barrier property is small due to the thickness of the plate body 2. Even if the thickness of the resin molded article 2 is 5 mm or more, further improvement of the welding strength and the barrier property can not be expected and the capacity efficiency of the battery container 10 is lowered.

In this embodiment, the end wall 42 of the container body 4 shown in Fig. 1 (a) 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 side end face of the plate body 2. The end wall 42 of the container main body 4 is fixedly connected to the side end of the plate body 2 in the state of being close to the side wall 43 to form the peripheral wall of the container main body 4. [ In addition, the shape of the end wall (42) is strengthened by the side edge of the valve element (2).

The end wall 42 and the side wall 43 of the container main body 4 are connected to each other in a state of being close to each other. However, the ridge line of the connecting portion has a small decrease in barrier property due to the thickness of the plate body 2.

The laminated film 1 is horizontally bent at the upper end of the end wall 42 and extended and protrudes outward from 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 lid member fusion surface which is the upper end surface of the plate member 2 and the lid holding portion 44 of the container body 4 to sandwich the lid, (4).

As an example of a method of manufacturing the battery container 10 of the present invention, an example of an independent container main body 4 will be described with reference to Figs. 3 to 5. Fig.

3, a resin plate 21 having the same width and thickness as the plate body 2 is welded to the welded layers on both sides of the laminated film 1 to be the side wall 43 of the container body 4 . At the time of melting, the side edges of the laminated film 1 and the resin plate 21 coincide with each other.

In this embodiment, the resin plate 21 is fused over the entire side surface of the laminated film 1, but it may be welded to a part of the side surface as long as the length of the plate body 2 can be ensured. In addition, the portion to be welded as the plate body 2 may be the entire surface of the main surface of the plate body 2, or only the peripheral edge, since the upper end cover weld surface and both end surfaces are fixed.

When the resin plate 21 is melted, it is preferable to weld the resin plate 21 from the side of the laminated film 1 by a known method such as ultrasonic sealing or heat sealing. Alternatively, the laminated film 1 may be placed in a mold, and the resin plate 21 may be injection molded on the deposited layers on both sides. When the laminated film (1) is produced, the deposited layer and the resin plate (21) may be extruded and extruded on a laminated film of the metal foil.

The plate member 2 may be directly formed by injection molding without using the resin plate 21 and may be deposited on the portion of the laminated film 1 which becomes the side walls 43 and 43 in the mold. In this case, the four corners of the laminated film 1 are cut while leaving the portion to be the bottom portion 41, and the portions which become the end walls 42, 42 and the lead holding portions 44, 44 and the side walls 43, 43) is formed in a cross shape so as to remain as a free end. It is also possible to cut four corners of the laminated film 1 after the plate body 2 is melted.

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

4, the four corners of the laminated film 1 are cut with the width of the main surface of the resin plate 21 so as to cut the laminated film 1 from the resin plate 21 to the plate body 2 ). The resin plate 21 becomes the plate body 2 by cutting the resin plate 21 so that the dimension of the main surface of the plate body 2 coincides with the dimension of the side wall 43 of the container body 4. [ Therefore, the side surface of the valve element 2 is formed by the cutting surface at this time.

As a method for notching the resin plate 21 and side faces of the laminated film 1, there is a method of using a punch mold to simultaneously apply the sides of the resin plate 21 and the laminated film 1, Cutting or the like can be adopted.

The punching using the punching mold is preferable because the resin plate 21 can be cut with a simple device in a short time.

4, when side faces of the resin plate 21 and the laminated film 1 are collectively cut, the laminated film 1 is free from the portion where the plate body 2 is welded and the portion where the plate body 2 is not present There are two remaining freeboards. These free ends are portions that become the end wall 42 and the lead nip portion 44.

5, the plate body 2 welded to the laminated film 1 is bent so as to stand on the laminated film 1, and the lower end face of the plate body 2 and the laminated film 1 1) is welded and fixed.

Next, the two free ends of the laminated film 1 are folded from the bottom of the resin molded body 2 and adhered to both end faces of the plate bodies 2, 2, and are welded from the side of the laminated film 1 . As a result, the end wall 42 of the container body 4 and the side wall 43 are fixed close to the plate body 2, and the wall surface of the container body 4 is connected to complete the peripheral wall.

When the lead holding portion 44 is formed by horizontally bending the free end protruding from the end wall 42 outwardly, the battery container 10 of the present embodiment shown in Figs. 1 (a) and 1 (b) Loses.

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 was placed in the obtained battery container 10 and the lid material 3 was placed in the opening portion of the battery container 10, both the upper surface of the plate body 2 of the battery container 10 and the lead- The cover member 3 is welded to the cover member 3. When the lid 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, the film packaging battery 20 of this embodiment shown in Fig. 2 is obtained Loses.

In addition, the battery container 10 and the film packaging battery 20 of this embodiment can be efficiently manufactured by using the long laminated film 1. Hereinafter, an example of the manufacturing method will be described with reference to Figs. 6 to 12. Fig.

The method of manufacturing the battery container 10 of this embodiment includes a resin plate welding step, a valve body cutting step, a side wall forming step, and a wall connecting step. These steps are generally the same as the method of manufacturing the independent container body 4. Hereinafter, only different points for the individual processes will be described.

<Resin plate welding step>

As shown in Fig. 6, elongated resin plates 21 to be a plurality of plate bodies 2 are welded to the welding layers on both sides of the long laminated film 1. The elongated laminated film 1 has openings for exposing the leads. As a method of forming the opening, a method of using a punching die or a method using a laser beam may be employed.

The method of welding the elongated resin plate 21 is the same as the welding method of the laminated film 1 and the resin plate 21 in the manufacturing method of the independent container main body 4. [

The opening of the elongated laminated film 1 is intended to apply the band of the container body 4 obtained by the wall connection step described later to the method of manufacturing the film packaging battery 20 as it is. When the film packaging battery 20 is manufactured by cutting a plurality of the container main bodies 4 independent of the band of the container main body 4, the opening may be omitted.

In the case of forming an opening in the long laminated film 1, it may be after the elongated resin plate 21 is welded, but it is preferable to form an opening in the long laminated film 1 for the first time because the workability is good .

&Lt; Sheet cutting process &

7, a plurality of plate bodies 2 are cut out from a long laminated film 1 having a long elongated resin plate 21 deposited thereon, in the same manner as in the method of manufacturing the independent container body 4. 8, the connecting portion having the opening and the lid holding portions 44, 44 and the end walls 22, 22 are formed by only the laminated film 1 between the adjacent plate bodies 2, To be cut out to be formed.

The laminated film 1 between the adjacent plates 2 is longer than the length of the connecting portion and the length of the two lid gripping portions 44 than the length of the laminated film 1 welded to the two adjacent cut surfaces (side end surfaces) of the plate 2 .

8, two two-dot chain lines 1a and 1a extending outward from an end edge of the opening of the laminated film 1 are imaginary lines to be cut to cut and remove the connecting portion. The sections to be cut 1a and 1a are formed by cutting off a connecting portion in which the finished container body 4 or a plurality of the film packaging batteries 20 are connected to each other by sandwiching the two lines of cut lines 1a and 1a, do. The widths of the two lines of the lines 1a and 1a to be cut may be smaller than the width of the opening if the connecting portion can be cut off.

The two-dot chain line 1b connecting the side edges of the plate body 2 is a boundary line between a portion that becomes the bottom portion 41 of the container body 4 and a portion that becomes the end wall 22. The boundary line 1b is folded inward when the laminated film 1 is welded to the plate body 2 and the end wall 22 is formed.

The two-dot chain line 1c between the boundary line 1b and the lines of cut 1a and 1a is formed in such a manner that the portion that becomes the end wall 22 of the container main body 4 and the portion that becomes the lead gripping portion 44 It is a borderline. The boundary line 1c is folded outward when the end wall 22 is formed.

6 to 12 show an example in which two continuous battery containers 10 are formed, but usually three or more battery containers 10 are formed.

&Lt; Side wall forming step &

9, the laminated film 1 is bent so that a plurality of cut sheets 2 are raised on the laminated film 1 in the same manner as in the manufacturing method of the independent container main body 4, ) And the laminated film 1 are welded and fixed, a plurality of side walls 43 are formed.

<Wall connection process>

The portion of the laminated film 1 between the side walls 43 to which the plate bodies 2 are welded to become the end wall 42 is folded inward vertically along the two-dot chain line shown in Fig. 8, folded outward horizontally, The connecting portion and the two lead-holding portions 44 are horizontally lifted up to be brought into close contact with the side end surface of the plate body 2.

When the laminated film 1 is welded and fixed to the side end faces of the plate body 2 in the same manner as in the manufacturing method of the independent container body 4, a plurality of the container bodies 4 shown in Fig. A band of the vessel 10 is obtained.

When the obtained connection portion of the band of the container body 4 is cut off and separated, a battery container 10 of the present embodiment shown in Fig. 1 is obtained.

The obtained band of the battery container 10 may be used as the battery container 10 without being divided.

Next, a method of manufacturing the film packaging battery 20 used as the battery container 10 without dividing the belt of the battery container 10 will be described.

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

&Lt; Battery element housing process &gt;

In the method for manufacturing the film packaging battery 20 of this embodiment, first, as shown in Fig. 11, the battery element 5 is housed in each battery container 10 of the band of the battery container 10.

When the battery element 5 is stored, the respective ends of the positive electrode lead and the negative electrode lead protruding from the battery container 10 in opposite directions are housed in the opening of the connection portion.

<Encapsulation process>

In this embodiment, a long lid member 3 to which a plurality of lid members 3 are connected is used. The lid member 3 has a connecting portion having an opening, like the connecting portion of the band of the battery container 10. The size of the opening may be different from the connecting portion of the band of the battery container 10, but is preferably the same. Further, a plurality of independent cover members 3 may be used.

The connection portion of the long lid 3 used in this embodiment is the same in width and length as the connection portion of the band of the container main body 4 and the openings of the same shape are formed at equal intervals. Normally, the lengths of the strips do not have to coincide.

The covering material 3 is superimposed so that the opening of the band of the battery container 10 accommodating the battery element 5 and the opening of the long covering material 3 coincide with each other, The lid member 3 is welded to both the upper end surface of the plate body 2 of the main body 4 and the lid holding portion 44. [ 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 of the film packaging battery 20 shown in Fig.

When the connecting portion of the obtained film packaging battery 20 is cut off, the film packaging battery 20 shown in Fig. 2 is completed.

The strip of the obtained film packaging battery 20 may be left as it is.

&Lt; Example 2 &

As shown in Fig. 13, the battery container 10 of this embodiment is different from the battery container 10 of the first embodiment in that the length of the lower end face of the plate body 2 is shorter than the length of the upper end face Only. The side surface of the plate body 2 is inclined at an acute angle with respect to the upper end surface so that the gap between the bottom surface 41 of the end wall 42 and the lead gripping portion 44 The bend angle is small. Therefore, the battery container 10 of this embodiment is preferable in the case of using a stainless steel foil having high rigidity as the barrier layer on 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.

Hereinafter, only the difference of the battery container 10 of the present embodiment from the battery container 10 of the first embodiment will be described.

Both end surfaces of the plate body 2 used in the battery container 10 of this embodiment are formed to be inclined at an acute angle with respect to the upper end surface. 13, the main surface of the valve element 2 shown in Fig. 13 is trapezoidal. However, as shown in Fig. 14, as the side end surface of the valve element 2 approaches the upper end surface side to the lower end surface side, . On the contrary, in the plate body 2 shown in Fig. 13, the inclination angle may be curved so as to approach 90 degrees as approaching from the lower end face to the upper face side.

Particularly, when the plate member 2 shown in Fig. 14 is used, when the lid member 3 is welded to the lid holding portion 44, the tip end of the plate member 2, Since the ridgeline can be easily melted, the lid material 3 can be hermetically sealed.

As shown in Fig. 13, the length of the lower end face of the battery element 10 of the present embodiment is shorter than the length of the upper end face.

15, the battery container 10 of the present embodiment is formed from the resin plate 21 welded to the laminated film 1 to the plate body 21 so that the length of the lower end face of the plate body 2 becomes shorter than the length of the upper end face, (2) is cut out in the same manner as in the first embodiment.

The planar bodies 2 and 2 need not necessarily be formed with acute angles on both end faces of the plate body 2 and one of the opposite side end faces is inclined at an acute angle with respect to the upper end face, Or may be formed vertically as well.

When the battery element 5 is housed in the battery container 10 of this embodiment and the lid 3 is fused in the same manner as in the first embodiment, the film packaging battery 20 of the present embodiment shown in Fig. 16 is completed .

In addition, the battery container 10 and the film packaging battery 20 of the present embodiment can be efficiently manufactured by using the long laminated film 1. As an example of the manufacturing method, in the plate body cutting step of the first embodiment, if the length of the lower end face shown in Fig. 17 is changed so as to cut the plate body 2 shorter than the length of the upper end face, A band of the battery container 10 in which the battery container 10 is connected to the connecting portion is obtained.

When the connecting portion of the obtained cell container 10 is cut off and separated, the battery container 10 of the present embodiment is obtained.

Also in this embodiment, the obtained band of the battery container 10 can be used as the battery container 10 without being divided.

The band of the battery pack container 20 shown in Fig. 19 is formed in the same manner as the battery element housing process and the sealing process of the first embodiment, Is obtained.

When the connecting portion of the band of the obtained film packaging battery 20 is cut off and removed, the film packaging battery 20 shown in Fig. 16 is completed.

The strip of the obtained film packaging battery 20 may be left as it is.

&Lt; Example 3 &

As shown in Fig. 20, the present embodiment is different from the first embodiment in that the plate member 2 is provided on both end surfaces thereof with end wall reinforcing plates 2h and 2h extending inward when the battery container 10 is used . In this embodiment, since the end wall 42 of the plate body 2 is reinforced by the end wall reinforcing plates 2h and 2h, the shape of the battery container 10 is high.

Hereinafter, only the difference of the battery container 10 of the present embodiment from the battery container 10 of the first embodiment will be described.

20 (a), the battery container 10 of this embodiment is provided with the end wall reinforcing plates 2h and 2h on both end faces of the plate body 2, The sidewalls 43 of the sidewalls 43 are welded to each other. The main surface of the end wall reinforcing plate 2h which is the side end surface of the plate body 2 is welded to the welding layer of the end wall 42 of the container body 4. [ The lower end face of the end wall reinforcing plate 2h of the plate body 2 is welded to the welded layer of the bottom face 41 of the container body 4. [ The upper end face of the end wall reinforcing plate 2h of the plate body 2 is welded to the deposition layer of the cover material 3. [

When manufacturing the independent battery container 10 of this embodiment, since the shape of the plate body 2 in this embodiment is more complicated than that of the plate body 2 in the first embodiment, it is preferable that the plate body 2 is formed by injection molding Do. The main surface and the lower end surface of the end wall reinforcing plate 2h of the injection-molded plate body 2 can be welded to the laminated film 1 in the same manner as the side end surface and the lower end surface of the plate body 2 in the first embodiment have.

When the main surface of the plate body 2 is fused to the deposition layers on both sides of the laminated film 1, the plate body 2 may be directly formed by injection molding and may be deposited in the mold. In this case, the four corners of the laminated film 1 are cut in advance, and the portions which become the end walls 42 and 42 and the lead gripping portions 44 and 44 and the portions that become the side walls 43 and 43 remain free ends It is preferable to form it in a cross shape. It is also possible to cut four corners of the laminated film 1 after the plate body 2 is melted.

The battery container 10 of the present embodiment may be manufactured by cutting the plate body 2 of the container body 4 from the resin plate 21 serving as the plate body 2 in the same manner as in the first embodiment.

In the case of cutting the plate body 2, as shown in Fig. 21 (a), the end wall reinforcing plate 2h stands up on the main surface of the plate body 2 of the first embodiment which is not welded to the laminated film 1 The resin plate 21 is used to cut off the resin plate 21 from the position on the same side as the outer surface of the end wall reinforcing plate 2h as shown in Fig. 21 (b) It can be cut in the same manner as the example of the battery container 10.

The main surface and the lower end surface of the end wall reinforcing plate 2h of the cut plate body 2 can be welded to the laminated film 1 in the same manner as the side end surface or the lower end surface of the plate body 2 in the first embodiment .

The upper end face of the end wall reinforcing plate 2h is welded to the lid member 3 together with the upper end face of the plate body 2, as shown in Fig. 20 (b).

When the battery element 5 is housed in the container main body 4 of the battery container 10 of this embodiment and the lid material 3 is fused in the same manner as in the first embodiment, The film packaging battery 20 is completed.

In addition, the battery container 10 and the film packaging battery 20 of the present embodiment can be efficiently manufactured by using the long laminated film 1.

As an example of the manufacturing method, in the resin plate welding process of the first embodiment, the elongated resin plate 21 of FIG. 22, which becomes a plurality of plate bodies 2 shown in FIG. 23, 1). As shown in Fig. 22, a plurality of the end wall reinforcing plates 2h are erected on a main surface of the resin plate 21 of the first embodiment that is not fused to the laminated film 1 of the first embodiment have.

Then, in the same manner as in the plate body cutting step in the first embodiment, a long laminated film 1 in which a plurality of plate bodies 2 shown in Fig. 23 are welded is manufactured, and as shown in Fig. 24, The both ends of the laminated film 1 in the width direction are welded and fixed to the main surface of the end wall reinforcing plate 2h of the plurality of plate bodies 2 so that the plurality of container bodies 4 are connected to the battery container 10 ) &Lt; / RTI &gt;

When the connecting portion of the obtained cell container 10 is cut off and separated, the battery container 10 of the present embodiment shown in Fig. 20 (a) is obtained.

Also in this embodiment, the obtained band of the battery container 10 can be used as the battery container 10 without being divided.

The band of the battery pack container 20 shown in Fig. 25 is used in the same manner as the cell element storing process and the sealing process of the first embodiment, Is obtained.

When the connecting portion of the band of the obtained film packaging battery 20 is cut off, the film packaging battery 20 shown in Fig. 20 (b) is completed.

The strip of the obtained film packaging battery 20 may be left as it is.

&Lt; Example 4 &

26, the battery container 10 of the present embodiment is different from the battery container 10 of the first embodiment in that the resin molded body 2 is only a square frame chain (hereinafter referred to as &quot; the resin molded body 2 & May be referred to as &quot; frame body 2 &quot;). In this embodiment, since the entire circumferential wall of the container body 4 is reinforced by the frame body 2, the container body 4 has a high shape.

Further, since the battery container 10 of this embodiment can hold the lead only by the frame body 2 and the covering member 3, the lead holding portion 44 can be omitted. In this case, the leads can be held on any side of the battery container 10.

Hereinafter, only the difference of the battery container 10 of the present embodiment from the battery container 10 of the first embodiment will be described.

26 (a), the battery container 10 of the present embodiment is configured such that the outer peripheral surface of the frame body 2 is bonded to the sidewalls 43, 43 of the container body 4 and the welded layers of the end walls 42, 42 And is welded. The lower end face of the frame body (2) is welded to the bottom portion (41) of the container body (4). As shown in Fig. 26 (b), the upper end face of the frame body 2 is welded to the lid member 3.

Since the frame body 2 in this embodiment is more complicated in shape than the plate body 2 in the first embodiment, it is preferably formed by injection molding. Alternatively, it may be produced by extrusion molding in a cylindrical shape and cutting in the longitudinal direction.

As an example of manufacturing the independent container main body 4 of this embodiment, first, the frame body 2 is formed by injection molding. The frame body (2) is manufactured so that the outer periphery viewed in plan view coincides with the bottom (41) of the container body (4).

Next, as shown in Fig. 27, four corners of the laminated film 1 are cut to form the laminated film 1 in a cross shape. The cutting of the four corners is carried out in such a manner that a portion serving as the end walls 42 and 42 and the lead holding portions 44 and 44 and a portion serving as the side walls 43 and 43 And leaves it in the shape of a cross.

It is also possible to cut four corners of the laminated film 1 after the frame body 2 is melted.

The produced frame body 2 is superimposed on the deposition layer of the laminated film 1 cut in a cross shape and the lower end face of the frame body 2 is laminated on the bottom portion 41 of the container body 4 1) side. The outer periphery of the frame body 2 is made to coincide with the boundary of the portion to be the bottom portion 41 of the container body 4 when the frame body 2 is superimposed.

When the lower end face of the frame body 2 is welded to the bottom portion 41, the frame body 2 may be directly formed by injection molding, and then deposited on the welded layer of the laminated film 1 in the mold.

The free end of the laminated film 1 is folded from the bottom of the frame body 2 so that the portion that becomes the end walls 42 and 42 and the portion that becomes the side walls 43 and 43 are formed on the outer surface of the frame body 2 And the outer peripheral surface of the frame body 2 is welded to the deposition layer of the laminated film 1 from the side of the laminated film 1 to complete the battery container 10 of this embodiment shown in Fig. 26 (a).

The frame body 2 is directly formed by injection molding so that the lower end face and the outer circumferential face of the frame body 2 in the mold are laminated on the laminated film 1 ) To the deposition layer.

When the battery element 5 is housed in the battery container 10 of this embodiment and the lid 3 is fused in the same manner as the first embodiment, the film packaging battery 20 of this embodiment shown in Fig. 26 (b) Is completed.

In addition, the battery container 10 and the film packaging battery 20 of the present embodiment can be efficiently manufactured by using the long laminated film 1. Hereinafter, an example of the manufacturing method will be described with reference to FIGS. 28 to 30. FIG.

The method of manufacturing the battery container 10 of this embodiment includes a resin plate welding step, a valve body cutting step, a side wall forming step, and a wall connecting step. These processes are substantially the same as the manufacturing method of the independent container body 4. Hereinafter, only different points for each process will be described.

<Film notch process>

First, openings for exposing leads are formed on the long laminated film 1 as in the first embodiment. Then, in the same manner as in the plate member cutting process of the first exemplary embodiment, except that only the laminated film 1 is cut, the same cross-shaped laminated film as in the case of manufacturing the independent battery container 10 is connected to a plurality of connection portions having openings Thereby producing a laminated film (1).

28, the laminated film 1 is a laminated film which is provided on both sides of the elongated laminated film 1 and which is provided between the portions to be the bottom portions 41 of the plurality of container bodies 4, The width of the outer circumferential surface which is the main surface of the frame body 2 is notched so that the laminated film 1 longer than the length of the portion welded to the two opposing surfaces of the bodies 2, As a result, the side edges of the laminated film 1, which are welded to the frame body 2 and become the side walls 43, 43 from the bottom 41 of the plurality of container bodies 4, As shown in Fig.

&Lt; Resin Molded Body Welding Step &

The four corners of the bottom portion 41 of the container body 4 of the laminated film 1 are formed in the same manner as in the case of manufacturing the independent battery container 10 by injection molding a plurality of frame bodies 2 The frame body 2 is bonded to the welded layer of the portion that becomes the bottom portion 41 of the long laminated film 1 to form a plurality of And the elongated laminated film 1 on which the frame body 2 is welded is manufactured.

<Wall connection process>

The free ends of the notched portions of the elongated laminated film 1 to which the frame body 2 is welded and the plurality of free ends are raised and bent from the bottom portion of the frame body 2, The outer peripheral surface of the frame body 2 is welded to the deposition layer of the laminated film 1 from the side of the laminated film 1 to form the end walls 42 and 42 and the side walls 43 and 43.

In the same manner as in the wall surface connection step of the first embodiment, the end wall 42 of the laminated film 1 is vertically folded inward and horizontally outwardly folded so that the connecting portion and the two lead gripping portions 44 A plurality of battery containers 10 are connected to the connecting portion to obtain a band of the battery container 10. In this case,

When the connecting portion of the obtained cell container 10 is cut off and separated, a battery container 10 of the present embodiment shown in Fig. 26 (a) is obtained.

Also in this embodiment, the obtained band of the battery container 10 can be used as the battery container 10 without being divided.

A band of the film packaging battery 20 is obtained in the same manner as the battery element receiving process and the sealing process of the first embodiment by using the band of the battery container 10 as the battery container 10 without being divided.

When the connecting portion of the band of the obtained film packaging battery 20 is cut off, the film packaging battery 20 shown in Fig. 26 (b) is completed.

The strip of the obtained film packaging battery 20 may be left as it is.

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.

For example, in the case of the third embodiment in which the plate member 2 is provided with the end wall reinforcing plates 2h and 2h extending inward on both end faces in the case of the battery container 10, And the end portions of the end wall reinforcing plates 2h of the plate body 2 of the plate body 2 are arranged so as to face each other, The battery container 10 and the film packaging battery 20 can be efficiently manufactured using the long laminated film 1 in the same manner as the example.

Similarly, in the first and second embodiments in which the plate body 2 does not have the end wall reinforcing plates 2h and 2h on both end faces, the pair of plate bodies 2 previously injection- The battery container 10 and the film packaging battery 20 can be efficiently manufactured using the long laminated film 1 in the same manner as in the case of the fourth embodiment.

In the battery container 10 and the film packaging battery 20 of the fourth embodiment, instead of the frame body 2, there may be used a frame body in which notched portions are present on one side when viewed in a plan view, It is also possible to do. In this case, it is preferable to dispose the side where the notch is present or missing, on the side of the lead nip portion 44.

In the second embodiment using the plate body 2 in which the length of the lower end face of the plate body 2 is shorter than the length of the upper end face, a resin plate is provided between the end portions of the opposite plate bodies 2 It may be formed into a frame shape.

In addition, although the embodiments in which the positive electrode and the negative electrode extend and protrude in opposite directions are shown, the positive electrode and the negative electrode may extend and protrude from one side in the same direction.

One… Laminated film, 2 ... Resin molding (plate, frame), 21 ... Resin plate, 3 ... Cover material, 4 ... Container body, 41 ... (Of the container body), 42 ... (Of the container body), 43 ... (Of the container body), 44 ... (Of the container body), the nose of the lid, 5 ... Battery element, 10 ... Battery container, 20 ... Film wrapping battery.

Claims (11)

A container body comprising a container body formed from a laminated film having a metal foil and a deposition layer,
Wherein the peripheral wall of the container main body is formed by four wall surfaces folded and folded by a folding line formed by a straight line of a square bottom portion to be welded and connected to each other and a resin molding is welded to at least two opposing wall surfaces of the four wall surfaces And a battery case. The method according to claim 1,
Wherein the resin molded body is a plate body, and one side surface of the plate body is a welded surface with the lid material. 3. The method of claim 2,
And a wall reinforcing plate on both sides of the plate to weld the wall surface. The method according to claim 1,
Wherein the resin molded body is a frame body and the upper surface of the frame body is a welded surface with the lid material, and the outer peripheral surface of the frame body and the four wall surfaces are welded together. A container body comprising a laminated film having a metal foil and a deposition layer, and a method of manufacturing a battery container having a lid material,
A resin plate deposition step of depositing a long resin plate, which is divided into a plurality of resin molding bodies, in a deposition layer on both sides of the elongate laminated film;
Wherein the resin plate is left as a plurality of the resin molding bodies on both sides of the elongated laminated film and the lengths of the resin molding bodies adjacent to each other between the adjacent resin molding bodies A plate body cutting step of cutting the resin molded body by notching the resin plate and the laminated film so that the long laminated film remains,
The laminated film remaining in the resin molded body is folded and raised by a folding line formed so as to face the resin molded body on both sides so as to face each other and the laminated film contacting the lower end of the resin molded body is fused to the resin molded body to form side walls A side wall forming step,
Wherein a portion of the laminated film in which the notched portion is present is bent and folded by a folding line formed by a straight line from the bottom of the resin molded body and is superimposed and melted on the resin molded body to connect the four wall surfaces of the container body, And a wall surface connecting step of forming a peripheral wall of the battery case. A container body comprising a laminated film having a metal foil and a deposition layer, and a method of manufacturing a battery container having a lid material,
The laminated films longer than the length of the portions welded to the two opposing surfaces of the adjacent resin molded articles are left between the portions of the plurality of the container bodies that are the bottom portions on both sides of the elongated laminated film A notch is formed by notching the width of the main surface of the resin molded body so that side edges of the laminated film deposited on the resin molded body from the bottom portion of the container body are unfolded outward as a plurality of free ends, The process,
A resin-molded body deposition step of disposing the resin-molded body on the deposition layer of the laminated film by arranging the four corners of the bottom portion of the container body of the laminated film so that the edges of the outer peripheral surface of the resin-
A step of folding and folding a portion where the notched portion of the laminated film is present and a free end from a bottom portion of the resin molded body by a folding line formed by a straight line and superimposing and melting the resin molded body, And a wall surface connecting step of forming a peripheral wall of the container main body. delete delete A film packaging battery using the battery container according to any one of claims 1 to 4,
Wherein the battery element is housed in the container body and is sealed with a lid material. delete delete

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