KR102147653B1 - Battery casing, film packaging battery, and methods for manufacture thereof - Google Patents

Abstract

The present invention provides a battery container, a film packaged battery using the same, and a method for producing the same. The present invention is a battery container having a container body formed of a laminated film having a metal foil and a welding layer, wherein the circumferential wall of the container body is folded from a square bottom to stand upright, and the upper surface is a resin molded body that becomes a cover material welding surface. It provides a battery container, characterized in that the welding is connected.

Description

Battery container, film packaging battery, and manufacturing method thereof {BATTERY CASING, FILM PACKAGING BATTERY, AND METHODS FOR MANUFACTURE THEREOF}

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

BACKGROUND ART Conventionally, as a battery container for accommodating battery elements such as lithium ion secondary batteries and electric double layer capacitors (all charging and power generation elements including electrolytes), metal containers having excellent moisture vapor permeability have been widely used. However, the metal container is heavy and bulky, and the packaging process is also complex, resulting in insufficient productivity. In particular, the welding of the container body and the lid body requires a large number of steps, and there is also a problem in terms of mass production. Further, since lithium batteries for electric vehicles and the like are often loaded on vehicles, the container is required to be light and compact.

In response to such a request, a pouch type in which a laminate composed of a base layer, a metal foil such as aluminum, and a sealant layer is formed into a bag shape, or the laminate is press-molded to form a recess, and a lithium ion battery body is attached to the recess. Film packaging batteries such as an embossed type (also referred to as a "drawing processing type") to be accommodated have been developed (for example, Patent Documents 1 to 2).

The drawing processing type battery container can accommodate even a rather thick battery element, and it is easy to charge and package the battery element, its volumetric efficiency (the ratio of the volume to the total volume of the battery container) is high, and it is easy to reduce weight and cost. There is an advantage of being low.

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

However, as described in Patent Documents 1 and 2, in the case of a drawing processing type battery container, if a slip agent or a liquid paraffin layer is used, the lubricity of the surface of the mold and the packaging material is improved, so that a deep drawing process can be performed. However, even if the drawability is improved, since the metal foil is drawn in a three-dimensional shape, there is a limit to the drawing depth, and the depth of the drawing molding container is about 10 mm. For this reason, there has been a problem that a large-capacity thick battery element cannot be accommodated.

In addition, since the corners are stretched particularly strongly, the metal foil becomes thinner or a large number of pinholes occur in the metal foil. When moisture enters from a thin portion or a pinhole of the metal foil, it reacts with the electrolytic solution to generate hydrofluoric acid or the like. For this reason, there is a problem in that the welded portion of the electrode member is deteriorated and the electrolyte is leaked.

The present invention has been made in view of the above circumstances, and is light weight like a drawing processing type battery container, has high volumetric efficiency, and makes it possible to easily accommodate a large-capacity thick battery element, so that charging and packaging of the battery element is easy, It is an object to provide a battery container that can be designed with an arbitrary thickness, a film-packed battery using the same, and a method for producing these with high production efficiency.

The present invention provides the following battery containers.

(1) A battery container having a container body formed of a laminated film having a metal foil and a welding layer, wherein the circumferential wall of the container body is folded from a square bottom to stand upright, and the upper surface is a resin molded body that becomes a cover material welding surface. A battery container, characterized in that it is welded and connected.

(2) The battery container according to (1), wherein the resin molded body is a plate body, and a side surface of the plate body becomes a cover material welding surface.

(3) The battery container of (2), wherein the resin molded body is a plate body having an extension portion to 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 welding surface.

The present invention provides the following battery container manufacturing method.

(5) A method for producing a battery container according to any one of (1) to (3), wherein a long resin plate is divided into a plurality of the resin molded bodies by welding to the welding layers on both sides of the long laminated film. In the resin plate welding step and both sides of the elongated laminated film, the resin plate remains as a plurality of the resin molded bodies, and two adjacent resin molded bodies face each other between the adjacent resin molded bodies. A plate body cutting step of cutting the resin molded body by notching the resin plate and the laminated film so that the laminated film longer than the length welded to the surface remains, and the resin molded body on both sides of the laminated film on which the resin molded body is left face A sidewall forming step of forming a sidewall by bending the laminated film in contact with the lower end of the resin molded body to form a sidewall, and a portion of the laminated film where a notch portion is present from the bottom of the resin molded body. A method of manufacturing a battery container, comprising: a wall connection step of bending and standing up, overlapping and welding the resin molded body, and connecting the wall surfaces of the container body to form a peripheral wall of the container body.

(6) The method for manufacturing a battery container according to (1) to (4), wherein in both sides of the elongated laminated film, the resin adjacent between portions serving as the bottom portions of the plurality of container bodies The resin molded body is notched with the width of the main surface of the resin molded body so that the laminated film longer than the length of the portion welded to the two opposite faces of the molded bodies remains A film notch process of forming a notch so that the side edges of the laminated film welded to the laminated film are spread outward as a plurality of free ends, and the outer peripheral surface of the resin molded body at the four corners of the bottom of the container body of the laminated film The resin molded body welding process of aligning the corners of and welding the resin molded body to the welding layer of the laminated film, and the part where the notch portion of the laminated film is present and the free end are bent from the bottom of the resin molded body to stand up. And, respectively, overlapping and welding the resin molded body, and connecting the wall surfaces of the container body to form a peripheral wall of the container body.

(7) The method for manufacturing a battery container according to (5) or (6), further comprising an electrode opening step of forming an electrode lead-out portion formed of an opening in the elongated laminated film.

In addition, the present invention provides the following film packaging batteries.

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

In addition, the present invention provides a method for producing the following film packaged battery.

(9) A method of manufacturing a film packaged battery using the method of manufacturing a battery container according to any one of (5) to (7), comprising: a battery element storage step of storing a battery element in a battery container formed by the wall connection step; A method for producing a film-packed battery having a sealing step of welding a lid member to an opening of a battery container in this order.

According to the battery container and film packaged battery of the present invention, the battery container has a high barrier property, since it is composed of a laminated film including a thin metal foil having a bottom portion and a circumferential wall of the battery container body as in the drawing processing type battery container, It is lightweight and has high volumetric efficiency. Moreover, unlike a drawing processing type battery container, since the peripheral wall is connected by a resin molded body, it has excellent shape retention. In addition, since the laminated film including the metal foil is not drawn in a three-dimensional shape only by bending it with a folding line, even if the metal foil is thin, there are no cases where cracks or a large number of pinholes occur in the metal foil. For this reason, since the depth of the battery container body can be freely designed, a thick battery element having a large capacity can be easily accommodated. In addition, if the thickness is lowered so far, a metal foil having low drawability, which was not available for a container of a drawing processing type, or a laminated film using a metal foil that is not suitable for drawing processing because of its low extensibility, can be freely used.

In addition, since the resin molded body has a cover material welding surface, at least two opposite sides of the film packaging battery can be sealed by welding the cover material to the resin molded body. For this reason, since the welding portion of the lid member does not extend and protrude outward of the battery container, the battery becomes compact, and when a plurality of batteries are integrated and used, the volume of the integrated body can be reduced. In addition, it is excellent in handling when storing and accumulating a plurality of batteries.

According to the method for producing a battery container and film packaged battery of the present invention, a plurality of battery container bodies are formed using a long laminated film. For this reason, it is possible to continuously manufacture a battery container or a film packaged battery while rewinding the laminated film wound by roll, bobbin winding, or cassette winding, or the laminated film to which the resin molded body is welded, so that the production efficiency is high.

1 is a diagram showing a battery container according to a first embodiment. (a) is a perspective view, (b) is a cross-sectional view taken along AA in FIG. 1(a), and (c) is a cross-sectional view taken along BB in FIG. 1(a).
2 is a perspective view showing a film packaged 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 a long laminated film.
7 is a perspective view showing a part of the manufacturing process of the battery container of the first embodiment using a long laminated film.
8 is a plan view for explaining the long laminated film shown in FIG. 7.
9 is a perspective view showing a part of the manufacturing process of the battery container of the 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-packed battery using the battery container of the first embodiment manufactured using a long laminated film.
12 is a perspective view showing a part of the manufacturing process of a film-packed battery using the battery container of the first embodiment manufactured using a long laminated film.
13 is a diagram showing a battery container according to a second embodiment. (a) is a perspective view, and (b) is a cross-sectional view taken along CC in FIG. 13(a).
14 is a cross-sectional view showing another example of a resin molded body used in a second embodiment.
15 is a perspective view showing a part of the manufacturing process of the battery container of the second embodiment.
16 is a perspective view showing a film packaged battery using the battery container of the second embodiment.
17 is a perspective view showing a part of a manufacturing process of a battery container of a second embodiment using a long laminated film.
18 is a perspective view showing a part of a manufacturing process of a battery container of a second embodiment using a long laminated film.
Fig. 19 is a perspective view showing a part of a manufacturing process of a film-packed battery using a battery container of a second embodiment manufactured using a long laminated film.
20 is a diagram illustrating a battery container according to a third embodiment. (a) is a perspective view showing a battery container of this embodiment, and (b) is a perspective view showing a film packaged battery using the battery container of this embodiment.
Fig. 21 is a diagram showing a part of the manufacturing process of the battery container according to the third embodiment. (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 the resin plate is cut to form a resin molded body.
22 is a perspective view showing a part of the manufacturing process of the battery container of the third embodiment using a long laminated film.
23 is a perspective view showing a part of the manufacturing process of the battery container of the third embodiment using a long laminated film.
24 is a perspective view showing a part of a manufacturing process of a battery container of a third embodiment using a long laminated film.
Fig. 25 is a perspective view showing a part of a manufacturing process of a film-packed battery using a battery container of a third embodiment manufactured using a long laminated film.
26 is a diagram illustrating 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 packaged battery using the battery container of this embodiment.
27 is a perspective view showing a part of a manufacturing process of a battery container according to a fourth embodiment.
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 the manufacturing process of the battery container of the fourth embodiment using a long laminated film.
Fig. 30 is a perspective view showing a part of a manufacturing process of a film-packed battery using a battery container of a fourth embodiment manufactured using a long laminated film.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<Example 1>

The battery container 10 of this embodiment shown in FIG. 1 accommodates the battery element 5, and becomes the film packaged battery 20 of this embodiment shown in FIG. The film packaged battery 20 of this embodiment is a secondary battery, an electric double layer capacitor, or the like.

In the film packaged battery 20 of this embodiment, a battery element 5 having a positive electrode plate, a negative electrode plate, a separator, and an electrolyte solution is housed inside the battery container 10. In addition, the battery element 5 includes all elements necessary for charging and power generation including an electrolyte.

In the film packaged battery 20 of this embodiment, the positive electrode lead and the negative electrode lead electrically connected to the electrode plates of the positive electrode and the negative electrode protrude 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 solution 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 (c) has a container body 4 made of a laminated film 1 having a metal foil and a welding layer. In the battery container 10, a resin molded body 2 is welded to a welding layer of a pair of opposite side surfaces of the container body 4. The battery container 10 includes a bottom portion 41 formed in a rectangular shape when viewed in plan view, a pair of end walls 42 and 42 and side walls 43 and 43 standing up from the edge of the bottom portion 41, and It has a plate-shaped resin molded body 2 welded to the side wall 43 and a lead clamping portion 44 extending outwardly from the end of the end wall 42.

In the film packaged battery 20 shown in FIG. 2, the battery element 5 is housed in a battery container 10 and sealed with a lid member 3. The lid member 3 is welded to the lid member welding surface of the resin molded body 2 and the lead clamping portion 44 in the opening of the container body 4. The lid is pinched between the lid holding portion 44 and the lid member 3.

The circumferential wall of the container body 4 is folded into a folding line in which the end walls 42, 42 and the side walls 43, 43 are formed in a straight line, standing up from the square bottom part 41, and connected at the end of the resin molded body 2 Is formed. Since the container body 4 is formed of a laminated film 1 folded by a folding line formed of a straight line that does not have a bent part, the part where the circumferential wall stands from the bottom part 41, it is necessary to draw the metal foil in a three-dimensional shape. There is no

For this reason, there is no limit to the depth of the container body 4, the corners are particularly strongly stretched to make the metal foil thin, and there is no case where a crack or a large number of pinholes occurs in the metal foil.

The laminated film 1 forming the container body 4 is a laminated film in which a metal foil and a welding layer made of a thermoplastic resin are laminated on the innermost layer.

In this embodiment example, the laminated film 1 has a welding layer only on one side. In the laminated film 1, the welding layer becomes the innermost layer of the container body 4.

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

The protective layer prevents the metal foil from being corroded by moisture or electrolyte, or from being damaged by contacting the metal foil with other articles. The protective layer is preferably formed of a thermoplastic resin or a thermosetting resin having a higher melting point than that of the welding layer.

As a specific example of the laminated film 1, for example, a protective layer formed of a resin such as polyester such as polyethylene terephthalate or polybutylene naphthalate or a polyamide such as 6 nylon or 66 nylon, and stainless steel or A laminated layer formed of a metal foil such as aluminum and a polyolefin such as polyethylene or polypropylene is mentioned.

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

For lamination of each layer, a known method such as dry lamination, extrusion lamination or thermocompression lamination can be employed.

The metal foil of the laminated film 1 functions as a barrier layer that imparts 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, copper foil and lead foil.

Among these, an aluminum foil or an aluminum alloy foil is preferable because the specific gravity is small and excellent in electrical conductivity (easily stretched) 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 µm to 200 µm in consideration of securing barrier properties and processing suitability. If the thickness of the aluminum foil is less than 6 µm, the occurrence of pinholes increases and the barrier property may decrease.

In addition, stainless foils have lower thermal conductivity than aluminum foils, but have high tensile strength and corrosion resistance. Metal foil with high corrosion resistance is preferable in that the deposition layer inside the container body 4 is damaged, so that even if the electrolyte filled in the battery container 10 comes into contact, it does not corrode well, and gas barrier properties can be maintained. Do. In the case of using a stainless foil, austenite such as SUS304 or SUS316 having excellent corrosion resistance is preferable, and SUS316 is particularly preferable. The thickness of the stainless steel foil is preferably in the range of 10 µm to 150 µm. If the thickness of the stainless steel foil is less than 10 µm, the number of pinholes increases and the barrier property decreases. Further, when the thickness of the stainless steel foil exceeds 150 µm, it is difficult to process due to high rigidity.

The resin used for the welding layer of the laminated film 1 is, for example, high density polyethylene, medium density polyethylene, low density polyethylene, linear polyethylene, ethylene-acrylic acid copolymer, ethylene-methacrylic acid copolymer, ethylene-ethyl Polyethylene (PE) resins such as acrylate copolymers, ethylene-methyl acrylate copolymers, ionomers, ethylene-vinyl acetate copolymers, and carboxylic acid-modified polyethylene, propylene homopolymers, propylene-ethylene random copolymers, ethylene- And polyolefins such as polypropylene (PP) resins such as propylene block copolymers, propylene-?-olefin block copolymers, and carboxylic acid-modified polypropylenes.

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

When the cover material 3 is integrated with the laminated film 1, the ridge line on the upper surface of the container body 4 where the laminated film 1 is folded is covered with the laminated film 1, so that the resin molded body 2 is Even if it is a thin plate shape, it is preferable because the decline in barrier property is small. In addition, it is preferable that the ridge line opposite to the ridge line of the upper surface of the container body 4 where the laminated film 1 is folded is also covered with the laminated film 1. In this case, a welding layer is formed on the outer surface of the laminated film 1 by increasing the width of the laminated film 1, and the protruding cover material 3 is welded to the outer surface of the side wall 43 of the container body 4 It is preferable to fix it.

In this embodiment example, the cover member 3 is made of another member having the same width as the laminated film 1. In this case, although the ridge line of the upper surface of the container body 4 is not covered with the lid material 3, the decrease in barrier properties is usually small due to the thickness of the resin molded body 2.

When covering the ridge line of the upper surface of the container body 4 with the lid member 3, make the width of the lid member 3 wider than the width of the container body 4 to cover the entire top surface of the resin molded body 2 It is desirable to weld so as to. For this reason, even if the resin molded body 2 has a thin plate shape, it is preferable because the decrease in barrier properties is small. In this case, it is preferable to form a welding layer on the outer surface of the laminated film 1 as well, and fix the protruding lid member 3 to the outer surface of the side wall 43 of the container body 4 by welding.

When the laminated structure of the cover material 3 is different from the laminated film 1, it is preferably a laminated film having a metal foil and a welding 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 cover material 3 is a laminated film having a metal foil and a welding layer, it is preferable that the same protective layer as the laminated film 1 is laminated.

The battery container 10 of this embodiment is a cover having the same length as the side wall 43 on the inner surfaces of the side walls 43 and 43 on both sides of the container body 4 as shown in FIGS. 1 (a) and (c). The resin molded bodies 2 and 2 having re-welded surfaces are welded to face each other. The width of the resin molded body 2 is the same as that of the side wall 43.

In this embodiment, the resin molded body 2 is a plate-shaped having a bottom surface on the bottom portion 41 side of the container body 4, a top surface serving as a cover material welding surface on the opening side, and side cross-sections at both ends in the longitudinal direction. (Hereinafter, the "resin molded body 2" is sometimes referred to as "plate body 2").

In the plate body 2, the main surface is welded to the side wall 43, the side end surface, which is a longitudinal cross section, is welded to the end wall 42, and the lower end is welded to the bottom portion 41. The top surface of the plate body 2 becomes a welding surface with the cover member 3. As long as the plate body 2 has these welding surfaces, it may not be a plate shape. For example, a frame body with a central portion of the plate body 2 cut out may be used, or a bridge shape such as a pier and a deck of two or three or more bridges may be used.

In addition, in this specification, the "main surface" means the widest surface among a plurality of surfaces.

As the resin forming the resin molded body 2, a resin capable of being welded to the weld layer of the laminated film 1 can be used. It is preferable to use the same resin as the resin of the welding layer of the laminated film 1, but a different one may be used as long as it can be welded to the welding layer of the laminated film 1.

It is preferable that the thickness of the resin molded body 2 is 2 to 5 mm. When the thickness of the resin molded body 2 is 2 mm or more, the welding strength with the end wall 42 or the cover member 3 is excellent. Moreover, even if the connection part between the end wall 42 and the side wall 43 is not covered with the laminated film 1, the decrease in barrier property is small due to the thickness of the plate body 2. Even if the thickness of the resin molded body 2 is 5 mm or more, further improvement in welding strength and barrier properties cannot be desired, and the volumetric efficiency of the battery container 10 is lowered.

In this embodiment example, the end wall 42 of the container body 4 shown in FIG. 1(a) is not reinforced with a resin plate, and consists substantially of the laminated film 1. However, both ends of the end wall 42 are welded to the side end surface of the plate body 2. For this reason, the end wall 42 of the container body 4 is fixed to and connected to the side end of the plate body 2 in a state close to the side wall 43 to form a peripheral wall of the container body 4. In addition, the shape retention of the end wall 42 by the side end of the plate body 2 is enhanced.

The end wall 42 and the side wall 43 of the container body 4 are connected in close proximity, but the ridge line of the connection portion has a small decrease in barrier property due to the thickness of the plate body 2.

In the lid holding portion 44 of the container body 4, the laminated film 1 is horizontally bent at the upper end of the end wall 42 and protrudes outward from the container body 4.

2, the lid member 3 is welded to the lid member welding surface, which is the upper end surface of the plate body 2, and the lid holding portion 44 of the container body 4 to pinch the lid, and the container body The opening of (4) is blocked.

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

First, as shown in Fig. 3, resin plates 21 having the same width and thickness as the plate body 2 are welded to the welding layers on both sides of the laminated film 1 serving as the side walls 43 of the container body 4 . During welding, both edges of the resin plate 21 and the laminated film 1 are aligned.

In this embodiment, the resin plate 21 is welded over the entire side of the laminated film 1, but may be welded to a part of the side side as long as the length to be the plate body 2 can be secured. Further, 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 circumferential edge, since the upper lid welding surface and both side end surfaces may be fixed.

When welding the resin plate 21, it is preferable to perform welding from the laminated film 1 side by a known method such as ultrasonic sealing or heat sealing. Alternatively, the laminated film 1 may be put in a mold, and the resin plates 21 may be injection molded into the welding layers on both sides thereof. In addition, when manufacturing the laminated film 1, the welding layer and the resin plate 21 may be molded and laminated to the film on which the metal foil is laminated.

Further, without using the resin plate 21, the plate body 2 may be directly formed by injection molding, and the laminated film 1 may be welded to the portion serving as 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 serving as the bottom portion 41, and the portions serving as the end walls 42 and 42 and the lead clamping portions 44 and 44, and the side walls 43 It is desirable to form a crisscross shape so that the part that becomes 43) remains as a free end. Moreover, after welding the plate body 2, the four corners of the laminated film 1 can also be cut.

In addition, in this specification, the "free end" means an end which can move freely.

In this embodiment, as shown in FIG. 4, the laminated film 1 is notched at the four corners of the laminated film 1 with the width of the main surface of the resin plate 21, and the plate body 2 ) Cut out. The resin plate 21 becomes the plate body 2 by cutting out from the resin plate 21 so that the dimensions of the main surface of the plate body 2 match the dimensions of the side wall 43 of the container body 4. Therefore, the side cross-section of the plate body 2 is formed by the cut surface at this time.

As a method of notching the sides of the resin plate 21 and the laminated film 1, a method of collectively punching the sides of the resin plate 21 and the laminated film 1 using a punching mold, or using a laser beam Cutting, etc. can be employed.

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

As shown in FIG. 4, when the side sides of the resin plate 21 and the laminated film 1 are cut together, the portion to which the plate body 2 is welded and the plate body 2 do not exist in the laminated film 1. Two free ends remain. These free ends are portions that become the end wall 42 and the lead clamping portion 44.

And as shown in Fig. 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 of the plate body 2 and the laminated film ( Fix by welding 1).

Next, the two free ends of the laminated film 1 are bent from the bottom of the resin molded body 2 and adhered to each side end face of the plate bodies 2 and 2, and welded from the laminated film 1 side. . For this reason, the end wall 42 and the side wall 43 of the container body 4 are adjacent and fixed to the plate body 2, and the wall surfaces of the container body 4 are connected to complete the circumferential wall.

Then, when the free end protruding from the end wall 42 is horizontally bent to the outside to form the lead clamping portion 44, the battery container 10 of this embodiment shown in Figs. 1(a) and (b) is obtained. Lose.

In addition, the formation of the lead clamping portion 44 may be performed simultaneously with the formation of the end wall 42.

After putting the battery element 5 in the obtained battery container 10, and placing the cover member 3 in the opening, both the top surface of the plate body 2 and the lead clamping portion 44 of the battery container 10 The cover material (3) is welded to. In this way, when the lid is sandwiched between the lid member 3 and the lead clamping portion 44 and the opening of the battery container 10 is closed, the film packaged battery 20 of the present embodiment shown in FIG. 2 is obtained. Lose.

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

The manufacturing method of the battery container 10 of this embodiment has a resin plate welding process, a plate body cutting process, a side wall formation process, and a wall surface connection process. These processes are generally the same as the manufacturing method of the independent container body 4. Hereinafter, only the differences for individual processes will be described.

<Resin plate welding process>

As shown in FIG. 6, the elongate resin plate 21 which becomes the plurality of plate bodies 2 is welded to the welding layers on both sides of the elongated laminated film 1. The elongated laminated film 1 has an opening through which the lid is exposed. As a method of forming the opening, a method of punching using a punching mold, cutting using a laser beam, or the like can be adopted.

The welding method of 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 body 4.

The opening of the elongated laminated film 1 is for applying the strip of the container body 4 obtained by the wall connection step described later to the manufacturing method of the film packaged battery 20 as it is. In the case of manufacturing the film packaged battery 20 by cutting out a plurality of container bodies 4 independent from the strips of the container body 4, there may be no openings.

In the case of forming an opening in the long laminated film 1, it may be after welding the long resin plate 21, but it is preferable because the workability is good if an opening is first formed in the long laminated film 1 .

<Plate cutting process>

As shown in FIG. 7, in the same manner as in the manufacturing method of the independent container body 4, a plurality of plate bodies 2 are cut out from the long laminated film 1 to which the long resin plate 21 is welded. At the time of cutting, as shown in FIG. 8, a portion consisting of only the laminated film 1 between the adjacent plate bodies 2 includes a connecting portion having an opening, a lead holding portion 44, 44, and end walls 22, 22. Cut it so that it consists of a part that is formed.

Therefore, the laminated film 1 between the adjacent plate bodies 2 is longer than the length welded to the two adjacent cut surfaces (side sectional surfaces) of the plate body 2 by the length of the connecting portion and the two lead clamping portions 44 .

Referring to FIG. 8, two dashed-dotted lines 1a and 1a extending outward from the end edge of the opening of the laminated film 1 are virtual cut-off lines for cutting and removing the connecting portion. The intended cutting line 1a, 1a is divided by cutting and removing the connecting part that is inserted into the two pairs of the scheduled cutting line 1a, 1a by a strip connected to a plurality of the finished container body 4 or the film packaging battery 20 do. The widths of the two pairs of scheduled cutting lines 1a and 1a may be narrower than the width of the opening as long as the connecting portion can be cut off.

Further, the two-dot chain line 1b connecting the side end faces of the plate body 2 is a boundary line between the portion serving as the bottom portion 41 of the container body 4 and the portion serving as the end wall 22. This boundary line 1b is folded inward when the laminated film 1 is welded to the plate body 2 to form the end wall 22.

In addition, the two-dot chain line 1c between the boundary line 1b and the intended cutting line 1a, 1a is between the end wall 22 of the container body 4 and the lead clamping portion 44. It is the border line. This boundary line (1c) is folded outward when forming the end wall (22).

In addition, although an example in which two battery containers 10 are formed in succession is shown in FIGS. 6 to 12, three or more battery containers 10 are typically formed.

<Side wall formation process>

As shown in Fig. 9, in the same manner as in the manufacturing method of the independent container body 4, the laminated film 1 is bent so that the plurality of cut-out plate bodies 2 stand on the laminated film 1, and the plurality of plate bodies 2 ) When each of the lower surfaces and the laminated film 1 are welded and fixed, a plurality of sidewalls 43 are formed.

<Wall connection process>

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

And, in the same manner as in the manufacturing method of the independent container body 4, when the laminated film 1 is welded and fixed to the side end surface of the plate body 2, a plurality of container bodies 4 shown in FIG. 10 are connected by a connection part. A strip of container 10 is obtained.

The battery container 10 of this embodiment shown in FIG. 1 is obtained by cutting and removing the connection part of the strip of the obtained container main body 4.

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

Next, a method of manufacturing the film packaged battery 20 used as the battery container 10 without breaking the band of the battery container 10 will be described.

The manufacturing method of the film packaged battery 20 of this embodiment example adds a battery element storage process and a sealing process to the manufacturing method of the battery container 10 of this invention. Hereinafter, the battery element storage process and the sealing process will be described.

<Battery element storage process>

In the manufacturing method of the film packaged battery 20 of this embodiment, first, as shown in FIG. 11, the battery element 5 is accommodated in each battery container 10 of the strip of the battery container 10.

When the battery element 5 is housed, each end portion of the positive electrode lead and the negative electrode lead protruding from the battery container 10 in opposite directions is accommodated so as to be located in the opening of the connection portion.

<Encapsulation process>

In this embodiment, a long lid 3 to which a plurality of lids 3 are connected is used. This lid member 3 has a connecting portion provided with an opening, similar to the connecting portion of the belt 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 it is preferably the same. In addition, a plurality of independent cover members 3 may be used.

The connecting portion of the elongated lid member 3 used in this embodiment has the same width and length as the connecting portion of the band of the container body 4, and openings of the same shape are formed at equal intervals. In addition, the lengths of the bands do not normally need to be identical.

The lid member 3 is overlapped so that the opening of the belt of the battery container 10 in which the battery element 5 is accommodated and the opening of the long lid member 3 coincide, and from the side of the lid member 3, each container Each cover member 3 is welded to both the upper end surface of the plate body 2 of the main body 4 and the lead holding portion 44. In this way, when the lids are pinched between the lid members 3 and the lid holding portions 44 of each battery container 10 and the openings of each battery container 10 are closed, Fig. 12 The strip of the film packaging battery 20 shown in is obtained.

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

In addition, the strip of the obtained film packaging battery 20 may be used as a finished product as it is.

<Second form example>

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 of the plate body 2 is formed shorter than the length of the upper end. Only. In this embodiment, since the side end face of the plate body 2 is inclined at an acute angle with respect to the top face, compared to the first embodiment, the bottom face 41 and the lead clamping portion 44 of the end wall 42 are The bending angle is small. For this reason, the battery container 10 of this embodiment is preferable when a stainless foil having high rigidity is used as a barrier layer for the laminated film 1 or the lid 3. Further, since the opening of the container body 4 is wider than that of the bottom portion 41, the workability is good when the battery element 5 is accommodated.

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

Both side 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. Although the main surface of the plate body 2 shown in FIG. 13 is a trapezoidal shape, for example, as shown in FIG. 14, as the side cross-section of the plate body 2 approaches from the top side to the bottom side, it is curved so that the inclination angle approaches 90 It may be. Alternatively, on the contrary, in the plate body 2 shown in Fig. 13, it may be curved so that the inclination angle approaches 90 degrees as it approaches from the lower end to the upper end.

In particular, in the case of using the plate body 2 shown in FIG. 14, when the lid member 3 is welded to the lead clamping portion 44, the tip of the acute angle formed by the top and side end surfaces of the plate body 2 Since the ridge line can be melted easily, the cover member 3 can be hermetically sealed.

As shown in FIG. 13, in the battery container 10 of this embodiment, the length of the lower end surface of the plate body 2 is shorter than the length of the upper end surface.

As shown in Fig. 15, the battery container 10 of this embodiment is a plate body from the resin plate 21 welded to the laminated film 1 so that the length of the lower end surface of the plate body 2 is shorter than the length of the upper end surface. It can be produced in the same manner as in the first embodiment except for cutting out (2).

In addition, the plate bodies 2 and 2 need not necessarily have both side end faces of the plate body 2 formed at an acute angle, and one of the side end faces facing each other is inclined at an acute angle with respect to the top surface, and the other is It may be formed vertically together.

When the battery element 5 is housed in the battery container 10 of this embodiment and the lid material 3 is welded in the same manner as in the first embodiment, the film packaged battery 20 of this embodiment shown in FIG. 16 is completed. .

Moreover, the battery container 10 and the film packaging battery 20 of this embodiment can also be manufactured efficiently 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 surface shown in FIG. 17 is changed to cut the plate body 2 shorter than the length of the upper surface, a plurality of A band of the battery container 10 to which the battery container 10 is connected by a connecting portion is obtained.

The battery container 10 of this embodiment is obtained by cutting and removing the connection part of the strip of the obtained battery container 10.

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

Then, the strip of the battery container 10 is used as the battery container 10 without being divided, and the strip of the film packaged battery 20 shown in Fig. 19 is carried out in the same manner as the battery element storage step and sealing step of the first embodiment. Is obtained.

When the connecting portion of the strip of the obtained film packaging battery 20 is cut off, the film packaging battery 20 shown in FIG. 16 is completed.

In addition, the strip of the obtained film packaging battery 20 may be used as a finished product as it is.

<Example 3>

As shown in Fig. 20, this embodiment differs from the first embodiment in that the plate body 2 is provided with end-wall reinforcing plates 2h and 2h extending inward when the battery container 10 is formed on both side end surfaces. It is only a point. In this embodiment, since the end wall 42 is reinforced by the end wall reinforcing plates 2h and 2h on the side end surface of the plate body 2, the battery container 10 has a high shape retention.

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

As shown in Fig. 20(a), the battery container 10 of this embodiment is provided with end-wall reinforcing plates 2h and 2h on both side end surfaces of the plate body 2, and the main surface of the plate body 2 is the container body 4 ) Is welded to the welded layer of the sidewall 43. 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 welded layer of the end wall 42 of the container body 4. The lower end surface of the end wall reinforcing plate 2h of the plate body 2 is welded to the welding layer of the bottom surface 41 of the container body 4. The upper end surface of the end-wall reinforcing plate 2h of the plate body 2 is welded to the welding layer of the cover member 3.

When manufacturing the independent battery container 10 of this embodiment, since the plate body 2 in this embodiment has a more complex shape than the plate body 2 in the first embodiment, it is preferable to form it by injection molding. Do. The main and lower surfaces 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 and lower surfaces of the plate body 2 in the first embodiment. have.

When welding the main surface of the plate body 2 to the welding layers on both sides of the laminated film 1, the plate body 2 may be directly formed by injection molding and welded in a mold. In this case, the four corners of the laminated film 1 are cut in advance, and the portions that become the end walls 42 and 42 and the lead clamping portions 44 and 44 and the portions that become the side walls 43 and 43 remain as free ends. It is desirable to form it in a crisscross shape. Moreover, after welding the plate body 2, the four corners of the laminated film 1 can also be cut.

The battery container 10 of this embodiment may be manufactured by cutting the plate body 2 of the container body 4 out of the resin plate 21 serving as the plate body 2 similarly to the first embodiment.

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

The main surface or the lower end of the cut-out end wall reinforcing plate 2h of the 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, respectively. .

As shown in FIG. 20B, the upper end surface of the end-wall reinforcing plate 2h is welded to the cover member 3 together with the upper end surface of the plate body 2.

In the same manner as in the first embodiment, when the battery element 5 is accommodated in the container body 4 of the battery container 10 of this embodiment and the lid material 3 is welded, the example of this embodiment shown in Fig. 20(b) The film packaging battery 20 is completed.

Moreover, the battery container 10 and the film packaging battery 20 of this embodiment can also be manufactured efficiently using the long laminated film 1.

As an example of the manufacturing method, in the resin plate welding step of the first embodiment, using the long resin plate 21 of FIG. 22 which becomes the plurality of plate bodies 2 shown in FIG. 23, a long laminated film ( It is welded to the welding layer of 1). As shown in FIG. 22, in this elongated resin plate 21, a plurality of end-wall reinforcing plates 2h are erected on the main surface that is not welded to the laminated film 1 of the resin plate 21 of the first embodiment. have.

Then, in the same manner as in the plate body cutting process in the first embodiment, a long laminated film 1 to which a plurality of plate bodies 2 shown in FIG. 23 were welded was produced, and as shown in FIG. In the process, when both ends of the laminated film 1 in the width direction are welded to and fixed to the main surface of the end wall reinforcing plate 2h of the plurality of plate bodies 2, the plurality of container bodies 4 are connected to each other by a connection part. ) Is obtained.

The battery container 10 of the present embodiment shown in Fig. 20A is obtained by cutting and removing the connecting portion of the band of the obtained battery container 10.

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

Then, the strip of the battery container 10 is used as the battery container 10 without being divided, and the strip of the film packaged battery 20 shown in Fig. 25 is carried out in the same manner as the battery element storage step and the sealing step of the first embodiment. Is obtained.

When the connection part of the strip of the obtained film packaging battery 20 is cut off, the film packaging battery 20 shown in FIG. 20(b) is completed.

In addition, the strip of the obtained film packaging battery 20 may be used as a finished product as it is.

<Example 4>

As shown in Fig. 26, the only difference between the battery container 10 of this embodiment and the battery container 10 of the first embodiment is that the resin molded body 2 is a square frame (hereinafter, ``resin molded body 2). "Is sometimes referred to as "frame body 2"). In this embodiment, since the entire peripheral wall of the container body 4 is reinforced by the frame body 2, the container body 4 has a high shape retention.

In addition, in the battery container 10 of this embodiment, since the lead can be held by only the frame body 2 and the lid member 3, the lead holding portion 44 can be omitted. In this case, the lead can be pinched to any side of the battery container 10.

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

As shown in Fig. 26(a), in the battery container 10 of this embodiment, the outer circumferential surface of the frame body 2 is on the welded layer of the side walls 43 and 43 and the end walls 42 and 42 of the container body 4 It is welded. The lower end surface of the frame body 2 is welded to the bottom part 41 of the container body 4. As shown in FIG. 26(b), the upper end surface of the frame body 2 is welded to the cover member 3.

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

As an example of manufacturing the independent container body 4 of this embodiment, first, the frame body 2 is manufactured by injection molding. The frame body 2 is manufactured so that the outer periphery viewed from the plane coincides with the bottom part 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 crisscross shape. The cutting of the four corners is centered on the part that becomes the bottom part 41, and the part that becomes the end wall (42, 42) and the lead clamping part (44, 44) and the part that becomes the side wall (43, 43) are free ends. It leaves in the shape of a crisscross that spreads to the side.

Moreover, after welding the frame body 2, the four corners of the laminated film 1 can also be cut.

The produced frame body 2 was superimposed on the welding layer of the laminated film 1 cut in a crisscross shape, and the lower end of the frame body 2 was attached to the bottom part 41 of the container body 4 with a laminated film ( Weld from the 1) side. When the frame body 2 is superimposed, the outer periphery of the frame body 2 is aligned with the boundary of the portion that becomes the bottom part 41 of the container body 4.

When welding the lower end surface of the frame body 2 to the bottom part 41, the frame body 2 may be directly formed by injection molding, and at that time, it may be welded to the welding layer of the laminated film 1 in the mold.

Further, the free end of the laminated film 1 is bent from the bottom of the frame body 2 to form the end walls 42 and 42 and the sidewalls 43 and 43 on the outer peripheral surface of the frame body 2. The battery container 10 of the present embodiment shown in Fig. 26(a) is completed by making it in close contact and welding the outer peripheral surface of the frame 2 to the welding layer of the laminated film 1 from the laminated film 1 side.

When the frame body 2 is welded to the welding layer of the laminated film 1, the frame body 2 is directly formed by injection molding, so that the lower end and the outer peripheral surface of the frame body 2 are formed in the mold. ) May be welded to the welded layer.

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

Moreover, the battery container 10 and the film packaging battery 20 of this embodiment can also be manufactured efficiently using the long laminated film 1. Hereinafter, an example of the manufacturing method is described with reference to FIGS. 28 to 30.

The manufacturing method of the battery container 10 of this embodiment has a resin plate welding process, a plate body cutting process, a side wall formation process, and a wall surface connection process. These processes are generally the same as the manufacturing method of the independent container body 4. Hereinafter, only the differences with respect to the individual steps will be described.

<Film notch process>

First, in the same manner as in the first embodiment, an opening through which the lid is exposed is formed in the long laminated film 1. In the same manner as in the plate body cutting process of the first embodiment except for cutting only the laminated film 1, a plurality of laminated films having the same crisscross shape as in the case of manufacturing the independent battery container 10 are connected by a connecting portion having an opening. A laminated film 1 is produced.

As shown in FIG. 28, this laminated film 1 is a frame adjacent to each other between portions that become the bottoms 41 of the plurality of container bodies 4 on both sides of the long laminated film 1 It is notched with the width of the outer peripheral surface, which is the main surface of the frame body 2, so that the laminated film 1 longer than the length of the portion welded to the two opposite surfaces of the sieves 2 and 2 remains. As a result, the side edges of the laminated film 1, which is welded to the frame body 2 and becomes the side walls 43, 43, from the portion that becomes the bottom part 41 of the plurality of container bodies 4, is a plurality of free ends. It spreads outward.

<Resin molded body welding process>

In the same manner as in the case of injection-molding a plurality of frame bodies 2 and manufacturing the independent battery container 10, the four corners of the bottom part 41 of the container body 4 of the laminated film 1 The edges of the outer circumferential surface of the frame body 2 are aligned and arranged, and the frame body 2 is welded to the welding layer of the portion serving as the bottom part 41 of the elongated laminated film 1, and a plurality of A long laminated film 1 to which the frame body 2 is welded is produced.

<Wall connection process>

The part where the notch part of the long laminated film 1 to which the frame body 2 is welded and a plurality of free ends are bent from the bottom of the frame body 2 to stand up, respectively, on the outer peripheral surface of the frame body 2 In close contact, the outer peripheral surface of the frame body 2 is welded to the welded layer of the laminated film 1 from the laminated film 1 side to form end walls 42 and 42 and side walls 43 and 43.

And, in the same manner as in the wall connection process of the first embodiment, the portion that becomes the end wall 42 of the laminated film 1 is vertically folded inward and horizontally folded outward, so that the connection part and the two lead clamping parts 44 When the part is lifted horizontally and welded to the side end surface of the plate body 2 to be fixed, a band of the battery container 10 to which the plurality of battery containers 10 are connected by a connecting portion is obtained.

The battery container 10 of the present embodiment shown in Fig. 26A is obtained by cutting and removing the connecting portion of the band of the obtained battery container 10.

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

Then, the strip of the battery container 10 is used as the battery container 10 without being divided, and the strip of the film packaged battery 20 is obtained in the same manner as the battery element storage step and sealing step of the first embodiment.

When the connection part of the strip of the obtained film-packed battery 20 is cut off, the film-packed battery 20 shown in FIG. 26(b) is completed.

In addition, the strip of the obtained film packaging battery 20 may be used as a finished product as it is.

As described above, embodiments of the present invention have been described with reference to the drawings, but the present invention is not limited to these examples, and various modifications can be made without changing the gist of the present invention.

For example, in the case of the battery container 10, in the third embodiment, in which the plate body 2 is provided with end-wall reinforcing plates 2h and 2h extending inward on both side end surfaces, respectively, a pair of injection molding in advance When the ends of the end-wall reinforcing plate 2h of the plate body 2 are arranged so as to face each other, the shape of a square frame body with a missing middle part is formed, so a fourth form using a resin molded body 2 made of a frame body In the same manner as in the example, the battery container 10 and the film packaged battery 20 can be efficiently produced using the elongated laminated film 1.

In the same way, in the first and second embodiment examples in which the plate body 2 does not have end-wall reinforcing plates 2h, 2h on both side surfaces, a pair of plate bodies 2, which are injection-molded in advance, are formed into a double shape. By placing and using so as to face each other, the battery container 10 and the film packaged battery 20 can be efficiently manufactured using the elongated laminated film 1 in the same manner as in the case of the fourth embodiment.

In addition, in the battery container 10 and film packaged battery 20 of the fourth embodiment, instead of the frame body 2, a frame body in which a notch portion is present or one side is missing when viewed in a plan view is used. It is also possible to do. In this case, it is preferable to arrange the side in which the notch part exists or is missing on the lead clamping part 44 side.

Further, in the second embodiment using the plate body 2 in which the length of the lower end surface of the plate body 2 is formed shorter than the length of the upper surface, a resin plate is provided between the ends of the opposed plate bodies 2 It may be interposed and may be formed into a frame shape.

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

One… Laminated film, 2... Resin molded body (plate body, frame body), 21... Resin plate, 3… Cover material, 4... Container body, 41... Bottom (of container body), 42... End wall (of container body), 43... Side wall (of container body), 44. Lead holding part (of container body), 5... Battery element, 10... Battery container, 20... Film wrapped battery.

Claims (5)

A battery container having a container body formed of a laminated film having a welding layer on one side of the metal foil and a protective layer on the other side of the metal foil, and a lid member,
It is made with the welding layer as the inner surface side of the container body,
The circumferential wall of the container body is formed by welding and connecting four wall surfaces that are folded and standing by a folding line from the bottom of the container body,
A resin molded body is welded to at least a pair of opposed wall surfaces among the four wall surfaces,
The protective layer is formed of a thermoplastic resin or a thermosetting resin having a higher melting point than the welding layer,
The battery container, wherein the resin molded body has a thickness of 2 to 5 mm. The method of claim 1,
The battery container, wherein the resin molded body is a plate body, and one side surface of the plate body serves as a welding surface with the lid member. The method of claim 2,
A battery container comprising, at both ends of the plate body, end-wall reinforcing plates to which the wall surfaces are welded. The method of claim 1,
The battery container, wherein the resin molded body is a frame body, an upper surface of the frame body becomes a welding surface with the cover member, and an outer peripheral surface of the frame body and the four wall surfaces are welded together. As a film packaged battery using the battery container according to any one of claims 1 to 4,
A film packaged battery, characterized in that the battery element is housed in the container body and sealed with the cover material.

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