JP2014216307A - Sealing member and container for power storage device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealing member of simple structure having high production efficiency, and high gas barrier properties less likely to transmit gas, e.g., steam or oxygen gas, and to provide a light-weight container for power storage device having a high volume ratio to which the sealing material is welded, and in which intrusion of moisture from the joint to the sealing member, or volatilization of liquid components from the content goods is reduced.SOLUTION: In a sealing member 1 having an inner surface welded to an opening inner surface of a weldable cylinder 51, a sealing wall 2 consisting of a metal foil laminate 21 having a metal foil and a welding layer is welded to the top surface of a frame 3 made of resin, and electrode terminals 4, 4 are fixed airtightly to the sealing wall 2.

Description

  The present invention relates to a sealing member used in a container for a power storage device for housing a power storage element, and a container for a power storage device in which the sealing member is welded.

Conventionally, a metal container having excellent water vapor permeability resistance has been used as a container for a power storage device that houses a power storage element of a power storage device such as a lithium ion secondary battery or a capacitor. However, metal containers are heavy, bulky, and complicated in the packaging process, so they lack productivity. In particular, welding of the container body and the lid requires a lot of labor, and there is a problem in productivity. Moreover, since there are many secondary batteries for electric vehicles mounted in a vehicle, it is desired that the container is light and the ratio of the internal volume to the entire volume (volume ratio) is large.
In response to these demands, a power storage device using a flat bag made of a laminate of aluminum foil or a drawn bag has been developed. However, power storage device containers that use aluminum laminate packaging materials have pinholes formed in the aluminum foil when the aluminum laminate packaging material is deep drawn to increase the volume ratio. There is a problem that gas enters.

On the other hand, light power storage device containers using resins such as polypropylene (PP) and polyethylene (PE) have also been developed. In particular, since PP has excellent heat resistance and good moldability, it is often used as a material for a container for a power storage device. As such a resin power storage device container, Patent Document 1 describes a secondary battery in which an opening of a resin container is closed with a resin top plate whose electrode terminals are fixed to through holes. Yes.
However, since this container uses a molded container, the wall of the container becomes thick, so there is a limit to increasing the volume ratio. Moreover, the metal foil is not laminated | stacked on this container and the top plate. Therefore, the structure is simple because it is not necessary to consider the insulation with the electrode terminal, but the barrier property against gas such as water vapor and oxygen gas from the outside is poor.

In order to enhance gas barrier properties, Patent Document 2 describes a metal lid member having a joint to be welded to a metal container and a battery lid that is integrated by injecting resin into a current collector. The battery lid presses the resin around the current collector with a pair of metal flanges in order to increase the adhesion between the lid material and the current collector. Further, the current collector is welded by irradiating the outer flange with a laser. In addition, the inner flange is covered with an insulating layer that is electrically insulated from the battery components in order to improve gas barrier properties.
However, this battery lid is very heavy because it uses a metal-molded lid or flange. Moreover, because of the complicated structure, the production efficiency is low and the battery cover is thick, so the volume ratio is small.

JP 2006-128126 A Special table 2012-524974 gazette

  In view of the above background, the present invention provides a sealing member having a simple structure, high production efficiency, and a high gas barrier property that hardly allows gas such as water vapor and oxygen gas to pass therethrough, and a lightweight and volume ratio in which the sealing member is welded. It is an object of the present invention to provide a container for a power storage device that is high and has low moisture intrusion from a joint portion with a sealing member and small liquid component volatilization from contents.

  In order to solve the above problems, the inventors of the present invention have studied to weld the sealing member to the tubular film with high gas barrier properties and high welding strength. The idea was to use a cylindrical body made of a metal foil laminate, and to insert and seal a sealing member made of a frame body in which the metal foil laminate was welded to the joining portion of the cylindrical film.

That is, the present invention provides the following sealing member.
(1) A sealing member in which an inner surface is welded to an inner surface of an opening of a weldable cylinder to seal the opening, and a sealing wall made of a metal foil laminate having a metal foil and a welding layer is a resin frame. A sealing member, wherein the electrode terminal is hermetically fixed to the sealing wall.

(2) The sealing wall is formed by laminating and welding the edges of the two metal foil laminates in the shape of a palm, and the electrode terminal is fixed to the sealing wall by the joint seal portion between the metal foil laminates. (1) The sealing member.
(3) The sealing member according to (2), wherein an insulating layer is laminated on the electrode terminal of the joint seal part.

(4) The sealing member according to (1), wherein an electrode terminal is fixed to the sealing wall by a welded portion between the sealing wall and the frame.
(5) The sealing member according to (4), wherein an insulating layer is laminated on the electrode terminal of the welded portion between the sealing wall and the frame.

(6) The sealing member according to (1), wherein an electrode terminal inserted into a through-hole provided in the sealing wall is fixed to the sealing wall with a resin layer covering the periphery thereof.

The present invention also provides the following container for a power storage device.
(7) The sealing member according to any one of (1) to (6) is inserted and welded from one side or both ends of the cylindrical body, the inner surface of which is made of a weldable metal foil laminate, from the frame body side. A container for a power storage device.

According to the sealing member (1), since the in-mold molding or the metal foil laminate is not drawn, the sealing member has a simple structure and can be efficiently manufactured with a simple manufacturing apparatus.
In addition, since the metal foil laminate is not drawn, pinholes are not generated and gas barrier properties are excellent.
In addition, since the frame is a short cylinder that can be welded to the cylinder that is the container body, the amount of resin to be used is small, and the volume ratio of the power storage device container is high.
Moreover, since the periphery of the metal foil laminated body of a sealing wall is reinforced with the frame, rigidity is high even if the metal foil laminated body of a sealing wall is thin.
Moreover, the opening of the cylinder used as a container main body can be easily sealed with a frame.

According to the sealing member of (2), in addition to the effect of the sealing member of (1), the electrode terminal is fixed to the sealing wall by the joint seal portion of the sealing wall, so the sealing member has a simple structure and is simple. It can be manufactured efficiently with a manufacturing device.
It is also possible to insulate the electrode terminal from the metal foil on the sealing wall by increasing the thickness of the sealing layer on the sealing wall.
According to the sealing member of (3), in addition to the effect of the sealing member of (2), the electrode terminal can be insulated from the metal foil of the sealing wall without increasing the thickness of the sealing wall.

According to the sealing member of (4), in addition to the effect of the sealing member of (1), since the electrode terminal is fixed to the sealing wall at the same time as welding the sealing wall and the frame, the sealing member has a simple structure, It can be manufactured efficiently with a simple manufacturing device.
It is also possible to insulate the electrode terminal from the metal foil on the sealing wall by increasing the thickness of the sealing layer on the sealing wall.
According to the sealing member of (5), in addition to the effect of the sealing member of (4), the electrode terminal can be insulated from the metal foil of the sealing wall without increasing the thickness of the welding layer of the sealing wall.
According to the sealing member of (6), in addition to the effect of the sealing member of (1), since the electrode terminal is fixed to the sealing wall by the surrounding resin, it can be reliably insulated from the metal foil of the sealing wall.

  According to the container for a power storage device of (7), since a molded container having a thick wall is not used, it is lightweight and has a large volume ratio. Thereby, since the edge part of the cylinder used as a container main body does not become thick, water vapor | steam, oxygen gas, etc. do not penetrate | invade easily from here. Moreover, since the heating at the time of joining is easily transmitted to the side surface of the frame body, the joining time is shortened, and the container for the power storage device can be manufactured efficiently.

It is a perspective view which shows an example of the 1st form of the sealing member of this invention. It is sectional drawing explaining the manufacturing method of the sealing member of FIG. It is a perspective view which shows an example of the 1st form of the container for electrical storage apparatuses of this invention using the sealing member of FIG. It is a perspective view which shows an example of the 2nd form of the sealing member of this invention. It is sectional drawing explaining the manufacturing method of the sealing member of FIG. It is a perspective view which shows an example of the 2nd form of the container for electrical storage apparatuses of this invention using the sealing member of FIG. It is a perspective view which shows an example of the 3rd form of the sealing member of this invention. It is sectional drawing explaining the manufacturing method of the sealing member of FIG. It is a perspective view which shows an example of the 3rd form of the container for electrical storage apparatuses of this invention using the sealing member of FIG. It is a perspective view which shows an example of the frame used for the sealing member of (a) FIGS. 11-13, and (b) sealing member. It is a perspective view which shows another example of the 1st form of the sealing member of this invention, and the container for electrical storage apparatuses. It is a perspective view which shows another example of the 2nd form of the sealing member of this invention, and the container for electrical storage apparatuses. It is a perspective view which shows another example of the 3rd form of the sealing member of this invention, and the container for electrical storage apparatuses.

Hereinafter, the present invention will be described in detail based on embodiments.
FIG. 1 is a perspective view showing an example of a first form of a sealing member of the present invention. FIG. 2 is a cross-sectional view illustrating a method for manufacturing the sealing member of FIG. FIG. 3 is a perspective view showing an example of the first embodiment of the container for a power storage device of the present invention using the sealing member of FIG.
The sealing member 1 of this embodiment is a cylinder when the outer peripheral shape of the sealing member 1 when viewed from the plane (hereinafter sometimes referred to as “plan view”) is a circle, an oval, an ellipse, or a rectangle. This is preferable because welding with the body 51 is easy. Of these shapes, a quadrangular shape is preferable because a plurality of power storage devices can be efficiently integrated. When the outer peripheral shape of the sealing member 1 is a quadrangle, it is preferable that the corners are rounded in consideration of contact with other articles.

As shown in FIGS. 1 and 2, the sealing member 1 of the present embodiment includes a sealing wall 2, a frame body 3, and an electrode terminal 4.
The sealing wall 2 of the sealing member 1 is composed of a metal foil laminate 21 having a metal foil, a welding layer, and a protective layer.
In the sealing member 1 according to this embodiment, the electrode terminals 4a and 4b are sandwiched between the welding layers of the sealing wall 2 made of two metal foil laminates and are fixed in an airtight manner.
The metal foil of the sealing wall 2 is a gas barrier layer that blocks gases such as oxygen and water vapor.
Examples of the metal forming the metal foil of the sealing wall 2 include aluminum, stainless steel, iron, copper and lead. Of these foils, aluminum foil and stainless steel foil are preferred.
A plurality of these metal foils may be laminated.

Aluminum foil is preferable because of its low specific gravity and excellent thermal conductivity. When heat conductivity is excellent, heat dissipation when the power storage device generates heat is improved.
When an aluminum foil is used as the metal foil of the sealing wall 2, the thickness is preferably 6 μm to 200 μm, and more preferably 10 μm to 100 μm. If the aluminum foil is thinner than this range, the occurrence of pinholes will increase and the gas barrier properties will deteriorate. On the other hand, if the aluminum foil is thicker than this range, the workability is lowered. Further, the weight of the sealing member 1 is increased.
When a welding layer is directly laminated on a metal foil made of an aluminum foil, it is preferable that the aluminum foil is subjected to a surface treatment such as anodization or chromate treatment in order to improve adhesion to the welding layer.

Stainless steel foil is inferior in thermal conductivity to aluminum foil, but has high corrosion resistance. High corrosion resistance is preferable because when applied to the power storage device container 5, even when the inner wall of the sealing wall 2 such as the welded layer in the sealing wall 2 is damaged and the metal foil and the electrolyte are in contact with each other, it is difficult to corrode. When using a stainless steel foil, austenite such as SUS304 or SUS316 having high corrosion resistance is preferable, and SUS316 is particularly preferable.
When a stainless steel foil is used as the metal foil of the sealing wall 2, the thickness is preferably 10 μm to 150 μm. If the stainless steel foil is thinner than this range, the occurrence of pinholes increases and the gas barrier properties are reduced. If the stainless steel foil is thicker than this range, the rigidity is high and it is difficult to process.

The welding layer of the sealing wall 2 is a layer that welds the sealing wall 2 to the top surface 31 (see FIG. 2C) of the frame 3. In addition, the electrolyte contained in the power storage device container 5 is protected from contact with the metal foil of the sealing wall 2.
Examples of the resin constituting the welded layer of the sealing wall 2 include high-density polyethylene, medium-density polyethylene, low-density polyethylene, linear linear polyethylene, ethylene-acrylic acid copolymer, ethylene-methacrylic acid copolymer, ethylene- Ethylene acrylate copolymer, ethylene-methyl acrylate copolymer, ionomer, ethylene-vinyl acetate copolymer, polyethylene (PE) resin such as carboxylic acid-modified polyethylene, propylene homopolymer, propylene-ethylene random copolymer, Examples include polyolefins such as polypropylene (PP) resins such as ethylene-propylene block copolymers, propylene-α-olefin block copolymers, and carboxylic acid-modified polypropylene.
You may mix and use these resin. Further, these resin layers may be laminated to constitute a welding layer.

Among these resins, when the welding layer is directly laminated on the metal foil, a PE resin or PP resin modified with carboxylic acid is preferable.
Examples of carboxylic acids used for acid modification include acrylic acid, methacrylic acid, maleic acid, fumaric acid, itaconic acid, citraconic acid, their acid anhydrides, and their esters, amides, imides, metal salts and other derivatives. Can do. Of these unsaturated carboxylic acids, maleic acid is preferred, and maleic anhydride is more preferred. As an acid modification method, it is preferable to graft-polymerize an unsaturated carboxylic acid.

It is preferable that the resin constituting the welding layer of the sealing wall 2 can be firmly welded to the frame 3. Moreover, since it is excellent in heat resistance, PP-type resin is preferable.
Therefore, the layer directly laminated on the metal foil of the sealing wall 2 is used as a resin layer of acid-modified PE-based resin or PP-based resin, and is laminated with a resin layer that can be strongly welded to the frame 3 to weld the sealing wall 2. Layers may be configured. Furthermore, in order to give the sealing wall 2 heat resistance, a polyolefin layer having a high melting point or a low MFR may be laminated as an intermediate layer.
When laminating the welding layer of the sealing wall 2, dry lamination using an adhesive, extrusion lamination in which a molten resin is extruded and laminated directly or via an anchor agent layer, and sand lamination in which a welding film is adhered by a molten resin layer of extrusion lamination Alternatively, a heat laminate or the like that is heat-pressed and pressure-bonded can be used.

When the electrolyte solution accommodated in the container 5 for power storage device permeates the welded layer of the sealing wall 2, the adhesive or anchor agent may be deteriorated. preferable.
The thickness of the welded layer of the sealing wall 2 is preferably 15 μm to 200 μm. If the weld layer is thinner than this range, it may be difficult to form the weld layer. Moreover, the welding strength at the time of welding with the frame 3 may be insufficient. If the weld layer is thicker than this range, the workability may be reduced.

Since the metal foil laminate 21 serving as the sealing wall 2 is desired to have high mechanical strength such as tensile strength and tear strength, a protective layer and a reinforcing layer are preferably laminated.
The protective layer or the reinforcing layer of the sealing wall 2 is preferably a film having high mechanical strength such as a polyester resin such as polyethylene terephthalate (PET) or a polyamide resin such as 6-nylon. These films are preferably biaxially stretched. A plurality of these films may be laminated. Moreover, printing and coloring may be given to these films.

The protective layer and the reinforcing layer of the sealing wall 2 may be laminated between the metal foil and the welding layer of the sealing wall 2 when the electrolyte permeates the welding layer of the sealing wall 2. Moreover, it is preferable that the protective layer and the reinforcing layer of the sealing wall 2 are laminated on the metal foil on the side where the weld layer does not exist. Thereby, the protective layer and the reinforcing layer of the sealing wall 2 can protect the metal foil of the sealing wall 2 from physical damage such as scratches and corrosion and deterioration of the metal foil of the sealing wall 2 due to gas such as oxygen and water vapor. it can.
A metal or metal oxide vapor deposition layer that blocks gas such as water vapor or oxygen gas may be further included outside the metal foil of the sealing wall 2. In this case, the vapor deposition layer is preferably laminated on the reinforcement layer, and the vapor deposition layer of the reinforcement layer is preferably laminated on the metal foil.
In laminating the reinforcing layer, film lamination such as dry lamination, heat lamination, and sand lamination can be used.

The sealing wall 2 of the sealing member 1 according to this embodiment is formed by stacking the edges of the two metal foil laminates 21 and 21 so that the palms are aligned with each other as shown in FIGS. The electrode terminal 4 is sandwiched and fixed to the welded joint seal portion 22.
In the joint seal, heat welding, ultrasonic welding, induction welding, high frequency welding, or the like can be used. In the joint seal, it is necessary to weld the periphery of the electrode terminal 4 in an airtight manner. Accordingly, among these welding methods, since the amount of resin melt is large, it is easy to cope with a three-dimensional shape and it is easy to air-tightly weld, so heat welding with a hot plate is preferable. The hot plate preferably has a recess corresponding to the electrode terminal 4. For the thermal welding, an impulse sealer that heats the ribbon heater only when energized may be used.

The frame 3 of the sealing member 1 is a short cylindrical resin molded product having an annular top surface 31 and a side surface 32 formed downward from the top surface 31. The frame 3 can be molded by injection molding or extrusion molding.
The cross section of the frame 3 may be a quadrilateral as long as it has the top surface 31 and the side surface 32, or may be a triangle or an inverted L shape by omitting a portion that is inside the frame.

The top surface 31 of the frame 3 is welded with the welding layer of the sealing wall 2. Therefore, the top surface 31 is preferably flat.
The width in plan view of the annular top surface 31 is preferably 3 mm to 10 mm. If the top surface 31 is narrower than this range, the welding strength between the sealing wall 2 and the welding layer may be insufficient. Moreover, when the top surface 31 is wider than this range, it may become difficult to weld the welding layer of the sealing wall 2 uniformly. Moreover, the volume ratio when it is set as the container 5 for electrical storage devices becomes small.
The outer peripheral shape of the top surface 31 is preferably substantially the same as the outer peripheral shape of the sealing wall 2. In order to make the outer peripheral shape of the top surface 31 substantially the same as that of the sealing wall 2, a larger sealing wall 2 is welded flat on the top surface 31, and the protruding unwelded portion is cut (trimmed). preferable.

The frame 3 of the sealing member 1 has a side surface 32 continuous in a strip shape from the top surface 31 downward. The side surface 32 of the frame 3 is inserted into and welded to the cylinder 51 of the power storage device container 5. Accordingly, the side surface 32 is preferably flat between the top surface 31 and the lower end.
It is preferable that the outer peripheral length of the side surface 32 is substantially the same as the inner peripheral length of the cylindrical body 51 because the frame body 3 is in close contact with the cylindrical body 51. It is preferable that the side surface 32 has an outer shape slightly tapered from the top surface 31 to the lower end, because the sealing member 1 can be easily inserted into and closely attached to the cylindrical body 51 of the power storage device container 5.

The side surface 32 of the frame 3 does not have to be a belt having a constant width from the top surface 31 to the lower end. For example, in the power storage device container 5, a protrusion serving as a spacer may be provided between the power storage element and the frame 3 of the sealing wall 2 in order to prevent the position of the power storage element such as the electrode group from shifting. Good.
The width of the band of the frame body 3 is preferably 3 mm to 10 mm at the narrowest place. If this width is narrower than this range, the welding strength with the cylinder 51 may be insufficient. If the width of the band is wider than this range, it may be difficult to weld the cylinder 51 uniformly. Moreover, the volume ratio when it is set as the container 5 for electrical storage devices becomes small.

The side surface 32 of the frame body 3 preferably has rigidity to reinforce the cylinder body 51 when the sealing member 1 and the cylinder body 51 are joined. Further, it is preferable that the side surface 32 has rigidity that functions as a receiving member when joined to the cylindrical body 51.
Therefore, in the cross section of the frame 3, it is preferable that the part of the side surface 32 has a certain thickness. This thickness depends on the rigidity of the resin used, the size of the cylinder 51 and the welding conditions when the sealing member 1 and the cylinder 51 are joined, but when the frame 3 has a square cross section, the thickness is 3 mm to 5 mm. The degree is preferred. When the cross section of the frame 3 is a triangle or an inverted L shape, it is approximately the same in the vicinity of the top surface 31 and can be made thinner toward the lower end. Even in that case, it is preferable that the lower end is about 1 mm.

The electrode terminal 4 of the sealing member 1 is a member for electrically connecting a power storage element in the power storage device and a device outside the power storage device. The electrode terminal 4 is often made of a material different between the positive electrode and the negative electrode, but will be described using the same reference numerals without distinction.
The electrode terminal 4 is sandwiched between the sealing walls 2 and is hermetically fixed to the sealing wall 2 so that one end is exposed to the outside of the power storage device container 5 and the other end protrudes from the frame 3.
The electrode terminal 4 is a plate-shaped or bar-shaped member made of a metal such as aluminum, copper, or nickel. The electrode terminal 4 preferably has a circular cross section, an oval shape, an oval shape, a quadrangular shape with rounded corners, or the like.
When using aluminum as the electrode terminal 4, it is preferable to perform the same surface treatment as when using aluminum foil as the metal foil of the sealing wall 2.

Although the sealing member 1 has positive and negative electrode terminals 4 and 4, one sealing member 1 may have only one of the electrode terminals 4. In this case, the sealing member 1 is joined to both ends of the cylindrical body 51. And when the cylinder 51 has metal foil, when joining the sealing member 1, since insulation can also be ensured by isolate | separating and joining each metal foil, the electrode terminal 4 is sealing. It does not have to be insulated from the metal foil of the wall 2.
However, in the case of this embodiment, the positive and negative electrode terminals 4 and 4 are fixed to the palm seal portion 22 of the sealing wall 2, so that it is preferable to be insulated from the metal foil of the sealing wall 2. The electrode terminal 4 can be insulated from the metal foil of the sealing wall 2 by thickening the welding layer of the palm seal portion 22 of the sealing wall 2 or by carefully forming the palm seal portion 22.

In the electrode terminal 4, an insulating layer 41 is preferably laminated at a portion sandwiched between the palm seal portions 22 of the sealing wall 2. Thereby, insulation with the metal foil of the sealing wall 2 improves, and the short circuit of a positive electrode and a negative electrode can be prevented more reliably.
The material forming the insulating layer 41 may be enamel, glass, wood, or the like as long as it is electrically insulating. However, if the insulating layer 41 is a thermoplastic resin, it can be laminated on the electrode terminal 4 in advance. This is preferable because the insulating layer 41 can be easily fixed to the sealing wall 2 when forming the palm seal portion 22 of the sealing wall 2.

Examples of the thermoplastic resin that forms the insulating layer 41 include the same polyolefin as the resin that forms the welded layer of the sealing wall 2. Among these resins, it is preferable that the resin can be firmly welded to the welding layer of the sealing wall 2. Moreover, it is preferable that it is excellent in heat resistance, and PP resin is preferable from this point.
The insulating layer 41 may be a single layer or a plurality of layers, similar to the welded layer of the sealing wall 2. In order to provide heat resistance, a polyolefin layer having a high melting point or low MFR may be laminated as an intermediate layer.
The layer directly laminated on the electrode terminal 4 of the insulating layer 41 is preferably a PE-based resin or PP-based resin modified with a carboxylic acid similar to the welding layer of the sealing wall 2.
The thickness of the insulating layer 41 is preferably 15 μm to 200 μm. If the insulating layer 41 is thinner than this range, it may be difficult to form the insulating layer 41. Moreover, when it melts and becomes thin when welding with the electrode terminal 4 or when sealing with the sealing wall 2, insulation may be insufficient. If the insulating layer 41 is thicker than this range, workability may be reduced.

When the electrode terminal 4 on which the insulating layer 41 is laminated is sandwiched between the joint seal portions 22 of the sealing wall 2 and welded, the PE-based resin or PP-based resin modified with the carboxylic acid used for the sealing layer of the sealing wall 2 described above. If an insulating film in which a resin layer similar to the welding layer of the sealing wall 2 on which these layers are laminated or a resin layer formed in advance on the film is welded to the electrode terminal 4, the insulating layer 41 with reliable insulation can be obtained. Easy to obtain.
The insulating film may be welded by wrapping one insulating film, but is welded with the electrode terminals 4 and 4 sandwiched between two insulating films wider than half the circumference of the electrode terminal 4. It is preferable. At the time of welding, heat welding with a hot plate is preferable for the reason described above. Also in this case, it is preferable that the hot plate has a recess corresponding to the electrode terminals 4 and 4.

When the electrode terminal 4 on which the insulating layer 41 is stacked is sandwiched and welded between the palm seal portions 22 of the sealing wall 2, it is preferable to weld so that one end of the insulating layer 41 is exposed to the outside of the palm seal portion 22 (FIG. 1). Thereby, even if the welding layer of the sealing wall 2 becomes thin at the time of welding of the electrode terminal 4, the metal foil of the sealing wall 2 and the electrode terminal 4 do not conduct | electrically_connect.
If at least one of the two insulating films is colored and laminated on the electrode terminal 4, it can be easily confirmed that the insulating layer 41 is exposed to the outside of the palm seal portion 22 when the electrode terminal 4 is welded. preferable.

In order to weld the sealing wall 2 formed with the palm seal portion 22 sandwiching the electrode terminals 4 and 4 to the top surface 31 of the frame 3, first, as shown in FIGS. The unsealed free ends 23 and 23 of the two sealed metal foil laminates 21 and 21 are opened and spread so as to become one flat sealing wall 2. In this state, as shown in FIG. 2 (c), the welding layer of the sealing wall 2 is brought into close contact with the top surface 31 of the frame 3 and welded.
When the top surface 31 of the frame 3 and the sealing wall 2 are welded, it is necessary to weld the joints between the two metal foil laminates 21 and 21 that are sealed together in a tight and airtight manner. Therefore, the welding method is preferably thermal welding using a hot plate for the reasons described above.

FIG. 3 is a perspective view showing an example of the first form of the power storage device container 5 of the present invention using the sealing member 1 of the first form.
The container 5 for a power storage device according to this embodiment is configured such that the sealing member 1 according to the first embodiment is inserted from the frame body 3 side into one end of a cylinder body 51 having a metal foil, and the side surface 32 of the frame body 3 is welded to the cylinder body 51. It is welded to the layer and sealed. In welding, heat welding, ultrasonic welding, induction welding, high frequency welding, or the like can be used. The power storage device container 5 includes a positive electrode terminal 4a and a negative electrode terminal 4b.

The other end of the power storage device container 5 is an electrode terminal manufactured in the same manner as the sealing member 1 by welding a metal foil laminate having the same laminated structure as the sealing wall 2 to a resin molded product molded in the same manner as the frame 3. A sealing member that does not have a seal is welded to the welded layer of the cylindrical body 51 and sealed. The end part only needs to be sealed in some form. For example, without using a sealing member, the welded layers of the cylindrical body 51 are welded to each other like the end part of the flat bag or the bottom of the gusset bag. It may be sealed.
Further, when one sealing member 1 has only one electrode terminal 4, the sealing member 1 can be bonded to both ends of the cylindrical body 51 and sealed. In this case, one sealing member 1 can have a positive electrode terminal 4a, and the other sealing member 1 can have a negative electrode terminal 4b. The resin molded product used for the sealing member may have a side surface having the same shape (or different shape) as the frame. The resin molded product of the sealing member having no electrode terminal does not have an opening for passing the electrode terminal such as a frame, and may be, for example, a bottomed tray shape or a plate shape.

It is preferable that the frame 3 side is inserted deeply and welded so that the metal foil of the sealing wall 2 and the metal foil of the cylindrical body 51 are close to each other because gas barrier properties are improved.
When inserting the sealing member 1 into the cylindrical body 51, it is preferable that the outer peripheral length of the side surface 32 of the frame body 3 is substantially the same as the inner peripheral length of the cylindrical body 51 because the frame body 3 is in close contact with the cylindrical body 51. At this time, it is preferable to slightly stretch the metal foil laminate of the cylinder 51. It is preferable that the side surface 32 is slightly tapered from the top surface 31 to the lower end because the sealing member 1 can be easily inserted into and closely attached to the cylinder 51 of the power storage device container 5.

Cylindrical body 51 used for power storage device container 5 is formed of a metal foil laminate having a weld layer on the inner surface. The cylindrical body 51 is preferably formed into a cylindrical shape by rounding a metal foil laminate and welding two opposing sides. The cylindrical body 51 may be formed by deep drawing a metal foil laminated body, but the metal foil laminated body that can be deep drawn has many restrictions, and the processing apparatus and the processing method become complicated.
When the metal foil laminated body used as the cylinder 51 has a welding layer only on one side, two opposing sides are welded with the welding layer facing inward, so that it becomes a joint seal part. In this case, the welded portion rises in a dorsal shape on the outer surface of the cylindrical body 51. Therefore, the welded portion is folded so as to overlap the outer surface of the cylindrical body 51, and if necessary, adhered to the outer surface of the cylindrical body 51 by welding or an adhesive Is preferred.

  When the metal foil laminated body of the cylinder 51 has a welding layer on both surfaces, it can also be set as the envelope sticker seal which overlaps and welds two opposing sides. Further, when the end portion of the cylindrical body 51 is used as a joint seal part, the joint seal part can be folded and welded to the outer surface of the cylinder 51. When the envelope sticker is used, the cylindrical body 51 is not bent at a steep angle, so that pinholes are hardly generated in the metal foil. Moreover, since the welded portion of the cylinder 51 is not conspicuous, the appearance is good. However, it is necessary to use a mandrel or the like as a receiving member during welding. Moreover, since the metal foil of the end surface of the cylinder 51 is exposed to the inner surface and the outer surface, a process of covering with a resin layer may be necessary.

For the welded layer of the cylindrical body 51, the same resin as the welded layer of the sealing wall 2 can be used. Among these, a resin that can be firmly welded to the side surface 32 of the frame 3 is preferable. Moreover, since it is excellent in heat resistance, PP-type resin is preferable.
The welded layer of the cylindrical body 51 may be a single layer or multiple layers like the welded layer of the sealing wall 2. In order to provide heat resistance, a polyolefin layer having a high melting point or low MFR may be laminated as an intermediate layer.
When the weld layer of the cylinder 51 is a layer that is directly laminated on the metal foil of the cylinder 51, a PE resin or PP resin modified with a carboxylic acid similar to the weld layer of the sealing wall 2 is preferable.

The thickness of the weld layer of the cylinder 51 is preferably such that the weld layer on the inner surface is in the range of 15 μm to 200 μm. If the weld layer of the cylinder 51 is thinner than this range, it may be difficult to form the weld layer. Further, the welding strength when the cylindrical body 51 is molded into a cylindrical shape or welded to the sealing member 1 may be insufficient. If the welded layer of the cylindrical body 51 is thicker than this range, water vapor, oxygen gas or the like may enter from the end face of the joint portion of the sealing member 1. The same applies to the thickness when the weld layer is provided on the outer surface of the cylindrical body 51.
When the welding layer of the cylindrical body 51 is laminated, it can be laminated similarly to the welding layer of the sealing wall 2.
When the electrolyte solution accommodated in the power storage device container 5 permeates the welded layer of the cylindrical body 51, the adhesive and the anchor agent may be deteriorated. Therefore, an extrusion laminate, a sand laminate, or a heat laminate that does not use these may be used. preferable.

The metal foil of the cylinder 51 is a gas barrier layer that blocks gases such as oxygen and water vapor from the laminate. As the metal foil of the cylinder 51, a metal foil similar to the metal foil of the sealing wall 2 can be used.
Among these, an aluminum foil is preferable because the specific gravity is small and the extensibility (easiness of extension) and heat conductivity are excellent, and an aluminum alloy foil is more preferable because the extensibility is excellent. When heat conductivity is excellent, heat dissipation when the power storage device generates heat is improved.

  When an aluminum foil is used for the metal foil of the cylindrical body 51, the thickness thereof is 6 μm to 200 μm, preferably 10 μm to 100 μm, in view of ensuring gas barrier properties and processability. If the aluminum foil is thinner than this range, the occurrence of pinholes will increase and the gas barrier properties will deteriorate. On the other hand, if the aluminum foil is thicker than this range, heat easily escapes when the sealing member 1 is welded, and the welding time becomes long. In addition, the weight of the power storage device container 5 increases.

The cylindrical body 51 preferably has high mechanical strength such as tensile strength and tear strength. Accordingly, a film made of a polyester resin such as polyethylene terephthalate (PET) or a polyamide resin such as 6-nylon is preferably laminated as the reinforcing layer. However, in the case where a plurality of power storage device containers 5 are collected and packaged together by injection of resin, for example, the reinforcing layer may not be stacked on the cylindrical body 51. These films are preferably biaxially stretched. A plurality of types of reinforcing layers of the cylindrical body 51 may be laminated. Further, the reinforcing layer of the cylindrical body 51 may be printed or colored.
A material similar to that of the reinforcing layer of the sealing wall 2 can be used for the reinforcing layer of the cylindrical body 51.

The cylinder 51 may include a gas barrier layer such as a metal vapor deposition layer or a metal oxide vapor deposition layer outside the metal foil of the cylinder 51 in order to prevent corrosion or deterioration of the metal foil due to a gas such as oxygen or water vapor. Good. The gas barrier layer is preferably laminated on the reinforcing layer of the cylindrical body 51.
In laminating these reinforcing layers, dry lamination, sand lamination, or the like can be used.

FIG. 4 is a perspective view showing an example of a second form of the sealing member of the present invention. FIG. 5 is a cross-sectional view illustrating a method for manufacturing the sealing member of FIG. 6 is a perspective view showing an example of a second embodiment of the container for a power storage device of the present invention using the sealing member of FIG.
4-6, each code | symbol attached | subjected to structures other than a sealing member and the container for electrical storage apparatuses shows the same thing as 1st form.
The second embodiment is different from the first embodiment only in an aspect in which the electrode terminal 4 is fixed to the sealing wall 2 and is otherwise the same. Only different points will be described below.

As shown in FIGS. 4 and 5, the sealing member 1 </ b> A of the second form includes a welded layer and a frame of the sealing wall 2 made of a single metal foil laminate 21 having the same laminated structure as the sealing wall 2 of the first form. The electrode terminals 4 and 4 are hermetically fixed by being welded with the electrode terminals 4 and 4 sandwiched between the top surface 31 of the body 3.
When the top surface 31 of the frame 3 and the sealing wall 2 are welded, the periphery of the electrode terminals 4 and 4 must be welded in an airtight manner. Therefore, the heat welding by a hot plate is preferable for the reason mentioned above. The hot plate preferably has a recess corresponding to the electrode terminals 4 and 4.
Also in this embodiment, the positive and negative electrode terminals 4 and 4 are made of the metal of the sealing wall 2 by thickening the welding layer of the sealing wall 2 or by carefully welding the sealing member 1A and the frame 3. It is possible to prevent conduction with the foil.

In the sealing member 1 </ b> A of this embodiment, it is preferable that the insulating layer 41 made of the insulating film used in the first embodiment is laminated on the surface where the electrode terminals 4 and 4 are in contact with the welded layer of the sealing wall 2. Thereby, insulation with the metal foil of the sealing wall 2 improves.
Moreover, it is preferable that the insulating layer 41 made of the insulating film used in the first embodiment is laminated on the surface where the electrode terminals 4 and 4 are in contact with the top surface 31 of the frame 3. Thereby, when sealing member 1A is joined to cylinder 51 which has metal foil, insulation with metal foil of cylinder 51 improves. Moreover, the circumference | surroundings of the electrode terminals 4 and 4 can be welded airtightly.
Both of these insulating layers 41 and 41 are preferably provided. Therefore, the insulating layer 41 is preferably laminated by the same method as in the first embodiment.

  6A of the 2nd form of electrical storage apparatus shown in FIG. 6 inserts sealing member 1A of a 2nd form in the edge part opening of the cylinder 51 similar to a 1st form, and the cylinder 51 is the same as a 1st form. It is formed by sealing.

FIG. 7 is a perspective view showing an example of a third embodiment of the sealing member of the present invention. FIG. 8 is a cross-sectional view illustrating a method for manufacturing the sealing member of the third embodiment. FIG. 9 is a perspective view showing an example of a third embodiment of the container for a power storage device of the present invention using the sealing member of the third embodiment.
7-9, each code | symbol attached | subjected to structures other than a sealing member and the container for electrical storage apparatuses shows the same thing as 1st form.
The third embodiment is different from the first embodiment only in an aspect in which the electrode terminal 4 is fixed to the sealing wall 2, and is otherwise the same. Only different points will be described below.

As shown in FIGS. 7 and 8, the sealing member 1B of the present embodiment has an electrode terminal 4 on the sealing wall 2 composed of a single metal foil laminate 21 having the same laminated structure as the sealing wall 2 of the first embodiment. It inserts in the provided through-hole 25, and is airtightly fixed to the through-hole 25 with the insulating layer 41 which consists of an insulating film used by the 1st form. The width of the insulating film and the length of the through hole 25 are set to be the same.
Thereby, while being able to prevent conduction | electrical_connection with the electrode terminal 4 and the metal foil of the sealing wall 2, it can fix to the through-hole 25 of the sealing wall 2 airtightly. Further, the electrode terminal 4 is not detached from the through hole 25 when the welding layer of the sealing wall 2 and the top surface 31 of the frame 3 (see FIG. 8C) are welded.
The electrode terminal 4 can be fixed by attaching an adhesive, resin, or the like to the insulating layer 41 that covers the periphery of the electrode terminal 4, but the free end 42 of the insulating film (see FIG. 8B) is formed when the insulating layer 41 is formed. It is preferable to leave and adhere to the weld layer of the sealing wall 2 from the root of the free end 42 to the vicinity of the tip, because fixing is easy.

  The insulating layer 41 of the electrode terminal 4 can be formed in the same manner as the insulating layer 41 of the first form. However, when leaving the free end 42 of the insulating film when the insulating layer 41 is formed, during welding, the periphery of the electrode terminal 4 located on one end side of the two insulating films is welded, and the two insulating films on the other end side are insulated. The film is preferably left unwelded as a free end 42 that can be freely opened and closed (see FIG. 8A). At the time of welding, the end of the insulating film may not be welded to the electrode terminal 4 by welding the middle of the insulating film, but the end is preferably welded to the electrode terminal 4.

  When fixing the electrode terminal 4, first, one end where the insulating layer 41 of the electrode terminal 4 is welded is inserted into the through hole 25 from the side of the sealing wall 2, and the free ends 42 and 42 of the two insulating films are inserted. The root is positioned in the through hole 25. Next, the roots of the two free ends 42, 42 are bent along the edge of the welded portion of the sealing wall 2 to be brought into close contact with the sealing wall 2. And it welds to the welding layer of the base of the electrode terminal 4 with a hot plate etc., and fixes the insulating layer 41 of the electrode terminal 4 to the welding layer of the sealing wall 2. FIG. In this way, it is preferable to form the hermetic fixing portion 26 by welding the free end 42 left on the electrode terminal 4 to the welding layer of the sealing wall 2 (see FIG. 8B). At the time of welding, the welding width around the through hole 25 is preferably 3 mm or more. If the welding width can be secured, the tip of the free end 42 of the insulating film may not be welded.

And in the airtight fixing | fixed part 26, the two directions of the through-hole 25 of the sealing wall 2 are covered with the free end 42 of an insulating film. In the remaining two directions (both ends of the through hole 25), both ends of the insulating layer 41 and both ends of the through hole 25 are in contact with each other, but are not covered with the free end 42 of the insulating film.
Accordingly, there is a possibility that a fine gap is created at both ends of the through hole 25, but the free end 42 of the insulating film is pushed and widened at the time of welding, and the gap of the through hole 25 is closed. Moreover, since the metal foil laminated body around the through-hole 25 is heated by the heat at the time of welding the free end 42 of the insulating film, the insulating layer 41 in contact with the inside of the through-hole 25 is melted to form the through-hole 25. The gap is closed.
At the time of welding, it is preferable to heat the immediate vicinity of the electrode terminal 4 using a hot plate having a welding surface expanded in a square shape at one end or both ends, such as an L shape or a U shape. Thereby, the metal foil laminated body around the through-hole 25 is easily heated, and the free end 42 of the insulating film is easily spread. In the case where the hot plate is U-shaped, it is preferable that the distance between the expanded weld surfaces is substantially the same as the width of the electrode terminal 4. It is sufficient that the expanded weld surface has a length and width of about 1 to 3 mm. However, when the electrode terminal 4 is extremely thick, it may be extended slightly larger than the thickness.

However, in some cases, a gap may remain at both ends of the through hole 25. Therefore, it is preferable to close both ends of the through hole 25 with an adhesive such as hot melt or epoxy, and it is more preferable to weld a small piece of a resin film to close a gap between both ends of the through hole 25.
When the insulating layer 41 having the free end 42 of the insulating film is formed by the method described above, the width of the insulating film welded to the electrode terminal 4 is wider than the width of the electrode terminal 4. Therefore, the free end 42 of the insulating film welded to the hermetic fixing portion 26 is welded with a width that is a half of the width difference from both ends of the electrode terminal 4 in the width direction.
Since both ends in the width direction of the insulating layer 41 and both ends of the through hole 25 are in contact with each other, the weld layers at both ends of the through hole 25 are in contact with both ends in the width direction of the free end 42 of the insulating film. Therefore, when two pieces of the resin film are arranged so as to include both ends of the through-hole 25 from the vicinity of both ends in the width direction of the electrode terminal 4 and welded to the welding layer of the sealing wall 2 together with the free end 42 of the insulating film, The gap at both ends of the hole 25 can be completely closed.

When using a small piece of a resin film, a resin film that can be welded to the insulating layer 41 and the welding layer of the sealing wall 2 is preferable, and a small piece of the insulating film used for the insulating layer 41 is more preferable.
Instead of using two pieces of resin film, one piece of resin film having a slit having the same length as the length of the through hole 25 may be used. In this case, since the small piece of the resin film bends, the electrode terminal 4 can be easily inserted. And since the slit of a resin film closely_contact | adheres to the electrode terminal 4, high airtightness is obtained easily. The resin film is preferably provided with a plurality of slits corresponding to the electrode terminals 4.
In addition, you may perform simultaneously with formation of the airtight fixing | fixed part 26 by welding of the free end 42, closing the clearance gap of the both ends of the through-hole 25. FIG. In this case, a small piece of the resin film may be placed on the free end 42 of the insulating film so as to be welded to the welding layer of the sealing wall 2. And if the small piece of the resin film which has a slit is used, it can position correctly by the electrode terminal 4 inserted in the small piece of the resin film.

The free end 42 of the insulating film is welded to the welded layer of the sealing wall 2 to form the airtight fixing portion 26 and the sealing wall 2 in which the electrode terminal 4 is fixed to the through hole 25 is formed in the same manner as in the first embodiment. The sealing member 1B of the third form shown in FIG. 7 is formed by welding to the top surface 31 (see FIG. 8C).
Then, the sealing member 1B is inserted into the end opening of the cylindrical body 51 similar to the first embodiment, the cylindrical body 51 is sealed similarly to the first embodiment, and the container for the power storage device of the third embodiment shown in FIG. 5B is formed.

FIGS. 10-13 is a conceptual diagram explaining another example of the 1st-3rd form of the sealing member of this invention, and another example of the 1st-3rd form of the container for electrical storage apparatuses of this invention using them. .
Fig.10 (a) is a perspective view which shows an example of the frame used for the sealing member of another example of the 1st-3rd form.
FIG.10 (b) is a perspective view which shows an example of the sealing member which seals the opening edge part of a cylinder on the opposite side to a sealing member.
FIGS. 11-13 is a perspective view which shows an example of the container for electrical storage apparatuses of this invention using the sealing member of another example of the 1st-3rd form.
10-13, each code | symbol attached | subjected to structures other than a sealing member and the container for electrical storage apparatuses shows the same thing as a 1st form.
Each of the sealing members 10, 10 </ b> A, and 10 </ b> B of this embodiment is different from the sealing members 1, 1 </ b> A, and 1 </ b> B of the first to third embodiments shown in FIGS. 1 to 9 in that the frame body 30 used for the sealing member has a recess 33. It is only the point which has, and other than that is the same. Only different points will be described below.

The sealing member 10 of another example of the 1st form shown in FIG. 11 is an example which applied the frame 30 which has the dent 33 shown to Fig.10 (a) to the sealing member 1 of an example of the 1st form shown in FIG. is there. The power storage device container 50 shown in FIG. 11 is an example using the sealing member 10.
A sealing member 10A of another example of the second form shown in FIG. 12 is an example in which the frame body 30 having the recess 33 shown in FIG. 10A is applied to the sealing member 1A of the example of the second form shown in FIG. is there. A power storage device container 50A shown in FIG. 12 is an example using the sealing member 10A.
A sealing member 10B of another example of the third form shown in FIG. 13 is an example in which the frame body 30 having the recess 33 shown in FIG. 10A is applied to the sealing member 1B of the example of the third form shown in FIG. is there. A power storage device container 50B shown in FIG. 13 is an example using the sealing member 10B.

The container 50, 50A, 50B for the power storage device of the present embodiment includes the sealing member 10, 10A, 10B having the recess 33 of the frame 30 shown in FIG. 10A and the sealing member 6 having no electrode terminal (FIG. 10 (b)) are welded to both ends of the cylindrical body 51 and sealed. The sealing member 6 has a recess 66 similar to the recess 33 of the frame 30, and a metal foil laminate 62 having the same shape and stacked configuration as the sealing wall 2 is welded to a resin molded product 60 similar to the frame 30. It is a configuration.
And as shown to FIGS. 11-13, the recessed part 55 is formed also in the intermediate part of the cylinder 51 in which the sealing member 10, 10A, 10B and the sealing member 6 do not exist.
By configuring the power storage device containers 50, 50 </ b> A, and 50 </ b> B in this manner, the self-supporting property is improved and the rigidity is increased. In addition, since the folds do not enter near both ends of the cylindrical body 51, the appearance is also improved. In addition, it becomes a space for buffering the pressure when the internal pressure of the power storage device using the power storage device containers 50, 50A, 50B rises.

The frame 30 shown in FIG. 10A has a recess 33 formed by recessing a part of the side surface 32 of the frame 30 in a groove shape. The dent 33 is for welding in a state in which the cylindrical body 51 is pressed against and closely adhered to the dent 33 by a protruding welding member corresponding to the groove-shaped dent 33 from the outside of the cylindrical body 51.
One recess 33 of the sealing members 10, 10 </ b> A, and 10 </ b> B may be provided on the sealing member, but it is preferable that two are provided facing each other. Accordingly, when the cylindrical body 51 is pushed into the recess 33 and welded, the sealing members 10, 10 </ b> A, and 10 </ b> B can be sandwiched between the two welding members and can be pushed into the respective recesses 33.
The size of the dent 33 is the circumference of the cylinder 51 in which the difference from the circumferential length of the cylinder 51 when there is no recess 33 of the sealing members 10, 10 </ b> A, 10 </ b> B (the margin of the cylinder 51) fits in the dent 33. It is preferable that the length is the same as or slightly smaller than the length because no flaws are formed during welding.

When the recess 33 is provided, when the sealing members 10, 10 </ b> A, and 10 </ b> B are disposed at the welding locations of the cylindrical body 51, slack is generated due to the margin of the cylindrical body 51, so that the insertion work is facilitated. Thereby, the tolerance (allowable error) at the time of molding the cylindrical body 51 can be increased.
Further, even if the cylindrical body 51 includes a metal foil that is difficult to stretch, the sealing members 10, 10 </ b> A, and 10 </ b> B can be easily welded to the cylindrical body 51 without causing cracks or tears. Further, when the cylinder 51 includes a gas barrier layer such as a metal or metal oxide vapor deposition layer, the vapor deposition layer is not damaged.

When the cylinder body 51 is pressed against the recess 33 from the outside, the cylinder body 51 is other than the recess 33 of the frame body 30 of the sealing member due to the force of the stretched cylinder body 51, that is, elasticity in elastic deformation. It adheres to the side surface 32 (main welding surface).
In order to develop this close contact due to elasticity, the elongation (strain) when the cylindrical body 51 is extended with the dent 33 is smaller than the strain when the cylindrical body 51 receives the load of the upper yield stress. It is preferable. When the cylindrical body 51 does not show the upper yield stress, the elongation when the cylindrical body 51 is extended by the dent 33 is a stress (0.2% proof stress) at which the permanent strain upon unloading becomes 0.2%. The strain is preferably smaller than the strain at the time of receiving a load. Thereby, distortion can be applied to the cylindrical body 51 within a range where elastic deformation is possible without reaching the yield point, and rapid plastic deformation of the cylindrical body 51 can be suppressed.

EXAMPLES Hereinafter, although this invention is demonstrated in detail based on an Example, this invention is not limited to this.
[Example 1]
Example 1 is an example relating to an example of the first form shown in FIGS. 1 to 3.
<Sealing wall 2>
As the electrode terminal 4, a positive electrode terminal 4 a made of an aluminum foil having a width of 5 mm, a length of 50 mm, and a thickness of 0.2 mm, and a negative electrode terminal 4 b made of a copper foil plated with nickel of the same size were used. As the insulating layer 41, an insulating film made of four maleic anhydride graft-modified PP films having a width of 10 mm, a length of 12 mm, and a thickness of 0.05 mm was used.

Between the two insulating films, the electrode terminal 4a was sandwiched by aligning the center lines of the width and length, and the entire insulating film was welded with a pair of hot plates to produce the electrode terminal 4a with the insulating layer 41. Similarly, the electrode terminal 4b with the insulating layer 41 was produced.
The electrode terminals 4 a and 4 b with the insulating layer 41 are exposed at both ends in the length direction of the electrode terminal 4 by 19 mm from both sides of the insulating layers 41 and 41, and between the insulating layers 41 and 41 on both sides in the width direction of the electrode terminal 4. The welded portion was formed by 2.5 mm.

A non-stretched PP film having a thickness of 60 μm serving as a welding layer is laminated on one surface of a metal foil made of an aluminum foil having a thickness of 12 μm, and a biaxially stretched 6-nylon film having a thickness of 15 μm serving as a protective layer is laminated on the opposite surface. The metal foil laminated body used as the wall 2 was obtained. For lamination, a dry laminate using a urethane-based adhesive was used.
Two pieces of the obtained metal foil laminate were cut into a rectangle having a width of 50 mm and a length of 15 mm.

The two metal foil laminates 21 and 21 were accurately stacked, and the insulating layers 41 and 41 of the electrode terminals 4a and 4b with the insulating layer 41 were arranged in parallel by being separated by 8 mm. At the time of arrangement, the insulating layer 41 was positioned 11 mm away from both ends in the width (long side) direction of the metal foil laminate, and sandwiched so as to cross the long side of the metal foil laminate. When sandwiched, the insulating layers 41 and 41 of the electrode terminals 4a and 4b with the insulating layer 41 were exposed 3 mm from the metal foil laminate.
A pair of hot plates are used to weld the edges sandwiching the electrode terminals 4a, 4b of the metal foil laminate to a width of 8 mm to form a palm seal portion 22, and the electrode terminals 4a, 4b with insulating layer 41 are connected to the sealing wall 2 It fixed to the joint seal part 22 of no. Since both corners of the joint seal portion 22 are hard, they are chamfered obliquely round.

<Frame 3>
A square tube having an outer dimension of 40 mm in width, 15 mm in length, and 4 mm in height was injection-molded with polypropylene to obtain a flat frame 3 shown in FIGS. 1 and 2. At the time of molding, the wall thickness was 3 mm near the top surface and 2.5 mm at the lower end, and the taper shape was such that the size of the outer dimension became smaller as it approached the lower end. In molding, the ridgeline of the side surface 32 was rounded and chamfered.

<Sealing member 1>
Open the unwelded free ends of the two metal foil laminates of the sealing wall 2 in which the electrode terminals 4a and 4b are fixed to the joint seal portion 22 and spread it so as to form one flat sealing wall 2. The weld layer of the sealing wall 2 was brought into close contact with the top surface 31 of the frame 3. When closely contacting, the sealing wall 2 was arranged so that the joint of the two metal foil laminates coincided with the center line of the width of the frame 3. In this state, heat is applied with a pair of hot plates so that no gap is formed between the joint of the two metal foil laminates and the frame 3, and the pressure is strongly pressed, so that the welded layer of the sealing wall 2 is framed. 3 was welded to the top surface 31.
The extra sealing wall 2 protruding from the frame 3 was cut along the side surface 32 of the frame 3 to produce the sealing member 1 shown in FIG.

<Cylinder 51>
On one surface of a 15 μm biaxially stretched 6 nylon film serving as a reinforcing layer of the cylinder 51, a 12 μm aluminum foil serving as a metal layer of the cylinder 51 and a 60 μm unstretched PP film serving as a weld layer of the cylinder 51, A laminated film of metal foil was obtained by dry lamination using a urethane-based adhesive. This laminated film was cut into a 60 mm × 130 mm rectangle. With the PP film of the laminated film cut into a rectangle as the inside, the short side edges 10 mm were overlapped and welded together to form a palm seal part to produce a cylinder 51 shown in FIG. The joint seal part was creased so as to overlap the unwelded cylinder 51.

<Power storage device container 5>
A sealing member that does not have an electrode terminal prepared in the same manner as the sealing member 1 by welding a single metal foil laminate having a laminated structure similar to that of the sealing wall 2 to a resin molded product molded in the same manner as the frame 3. The sealing member 6 shown in FIG. 10B is not provided with the recess 66. The sealing member is welded to one end of the cylindrical body 51 in the same manner as the sealing member 1 described below. And the end was sealed.
Necessary power storage elements were connected to the electrode terminals 4 a and 4 b of the sealing member 1, and the sealing member 1 was inserted from one end of the cylindrical body 51 to perform necessary processing as a power storage device. During the insertion, the sealing member 1 was arranged so that the palm seal portion of the cylindrical body 51 was positioned at the center of the long side surface 32 of the frame body 3. At the time of arrangement, the end of the frame 3 of the sealing member 1 was inserted, and the laminated film of the cylinder 51 was slightly expanded to arrange the entire frame 3 within the opening of the cylinder 51. A flat hot plate and a hot plate having a curved surface corresponding to the curved surface of the ridgeline of the side surface 32 of the frame 3 are welded to the welded layer of the cylindrical body 51 to seal the opening of the cylindrical body 51, as shown in FIG. A power storage device container 5 was produced.

[Example 2]
Example 2 is an example relating to an example of the second mode illustrated in FIGS. 4 to 6. Example 2 is the same as Example 1 except that the aspect of the sealing wall 2 and the aspect of fixing the electrode terminal 4 are different. Only different points will be described below.
<Sealing wall 2>
The metal foil laminate produced in Example 1 was cut into a rectangle with a width of 50 mm and a length of 20 mm to produce a sealing wall 2.

<Fixing of electrode terminal 4>
The long side of the produced sealing wall 2 and the long side of the frame 3 were aligned and overlapped. Between the sealing wall 2 and the frame 3, the electrode terminals 4 a and 4 b with the insulating layer 41 used in Example 1 were arranged so as to be orthogonal to the long side of the frame 3. In arranging the electrodes, the insulating layers 41 and 41 of the electrode terminals 4a and 4b are arranged in parallel with a distance of 8 mm, and are positioned 6 mm away from both ends of the frame body 3 so that the sealing wall 2 and the frame body 3 are positioned. Sandwiched between them. When sandwiched, the insulating layers 41 and 41 of the electrode terminals 4 a and 4 b with the insulating layer 41 were exposed 3 mm outside the frame 3.
In the frame 3, the electrode terminals 4 a and 4 b were bent to the opposite side of the sealing wall 2 and protruded from the frame 3. In this state, it pressed with a pair of hot plate, and welded three persons, the welding layer of the sealing wall 2, electrode terminal 4a, 4b, and the top | upper surface 31 of the frame 3. FIG. The excess sealing wall 2 protruding from the frame 3 is cut along the side surface 32 of the frame 3 and the electrode terminals 4a and 4b exposed to the outside of the frame 3 are bent upward, and the sealing member shown in FIG. 1A was produced.

<Power storage device container 5A>
A cylindrical body 51 is produced in the same manner as in Example 1, and both ends of the cylindrical body 51 are sealed with a sealing member and a sealing member 1A in the same manner as in Example 1 to produce a power storage device container 5A shown in FIG. did.

[Example 3]
Example 3 is an example relating to an example of the third mode illustrated in FIGS. 7 to 9. Example 3 is the same as Example 1 except that the aspect of the sealing wall 2 and the aspect of fixing the electrode terminal 4 are different. Only different points will be described below.
<Sealing wall 2>
The metal foil laminate produced in Example 1 was cut into a rectangle having a width of 50 mm and a length of 25 mm to produce a sealing wall 2.

<Fixing of electrode terminal 4>
The electrode terminal 4a used in Example 1 was sandwiched between two insulating films used in Example 1 in the same manner as in Example 1. One end in the length direction of the two insulating films sandwiching the electrode terminal 4a was welded with a hot plate over the entire width direction of the insulating film with a width of 5 mm. Insulating films were welded to both ends in the width direction of the insulating film where the electrode terminals 4a do not exist and in the vicinity thereof. An electrode terminal 4a with an insulating layer 41 was produced using an insulating film not welded to the electrode terminal 4a at the other end in the length direction as a free end 42 having a length of 7 mm.
The produced electrode terminal 4a with an insulating layer 41 had an insulating film in the center of the electrode terminal 4, and 5 mm of one side thereof was welded to the electrode terminal 4 to become the insulating layer 41, and 7 mm on one side became the free end 42. And the insulating layer 41 was formed with welded portions between the insulating films by 2.5 mm on both sides in the width direction.
The electrode terminal 4b with the insulating layer 41 was produced by welding an insulating film to the electrode terminal 4b used in Example 1 in the same manner as the electrode terminal 4a.

Two through-holes 25 and 25 made of slits having a width of 0.2 mm and a length of 10 mm were provided along the center line of the width of the sealing wall 2 at an interval of 8 mm.
One end of the sealing wall 2 on which the insulating film of the electrode terminal 4 a was welded was inserted into the through hole 25, and the roots of the free ends 42 and 42 of the two insulating films were positioned in the through hole 25. The bases of the free ends 42 and 42 of the insulating film were bent along the edge of the welded portion and welded to the welded layer of the sealing wall 2, and the insulating layer 41 of the electrode terminal 4 a was fixed to the welded layer of the sealing wall 2.
The sealing wall 2 to which the electrode terminal 4a is fixed has a 5 mm wide electrode terminal 4a having a length of 10 mm and a through hole 25 having an insulating layer 41 in which welded portions of insulating films are formed by 2.5 mm on both sides in the width direction. Has been inserted. The ends of the insulating layer 41 are in contact with both ends of the through hole 25. And the free ends 42 and 42 of the 7-mm width insulation film are bend | folded in the length (short side) direction of the sealing wall 2, and are welded to the welding layer of the sealing wall 2. FIG.

The insulating film used in Example 1 was cut into 5 mm vertically and horizontally to produce two pieces. At the both ends of the through-hole 25 with which the end portion of the insulating layer 41 is in contact, the produced small pieces are arranged in contact with the end portions of the electrode terminals 4a. The disposed small piece, the welded layer of the sealing wall 2 and the free end 42 of the insulating film were welded with a hot plate to form the hermetic fixing portion 26 of the sealing wall 2 to close both ends of the through hole 25.
In the same manner as the electrode terminal 4a, the electrode terminal 4b is inserted into the other through-hole 25, the free ends 42 and 42 of the insulating film are welded to the welding layer of the sealing wall 2, and sealed by two pieces of insulating film. An airtight fixing portion 26 of the wall 2 was formed and both ends of the through hole 25 were closed.
The sealing wall 2 in which the electrode terminals 4 a and 4 b inserted into the through holes 25 and 25 were fixed by the airtight fixing portions 26 and 26 was welded to the top surface 31 of the frame 3. The sealing wall 2 includes a free end 42 of the insulating film and a portion where the free end 42 of the insulating film is welded to one or two pieces of the insulating film, so that the sealing wall 2 is airtight. Welded carefully.
The extra sealing wall 2 protruding from the frame 3 was cut along the side surface 32 of the frame 3 to produce a sealing member 1B shown in FIG.

<Power storage device container 5B>
The cylindrical body 51 is produced in the same manner as in the first embodiment, and both ends of the cylindrical body 51 are sealed with the sealing member and the sealing member 1B in the same manner as in the first embodiment, thereby producing the power storage device container 5B shown in FIG. did.

[Examples 4 to 6]
Examples 4-6 are the same as Examples 1-3 except having produced the sealing member shown in FIGS. 11-13, and the container for electrical storage apparatuses using the frame 30 shown to Fig.10 (a). is there. Only different points will be described below.
<Sealing member 10>
The frame 30 was injection molded in the same manner as in Example 1. However, as shown in FIG. 10A, the frame 30 is provided with a pair of groove-shaped recesses 33, 33 on the side surface 32 of the short side facing the frame 30. The dent 33 has a semicircular shape with a diameter of 3 mm in plan view. At the time of molding, the ridgeline at the corner (side surface 32 between the short side and the long side) and the ridgeline at the edge of the outer peripheral surface of the recess 33 were rounded and chamfered. The wall thickness of the frame 30 was 3 mm from the top surface to the lower end and was not tapered. On the short side, the wall thickness was 3 mm at the deepest part of the recess 33.
The sealing wall 2 was produced in the same manner as in Example 1, and welded to the frame 30 to produce the sealing member 10 of Example 4 shown in FIG.

<Power storage device container 50>
A cylindrical body 51 was produced in the same manner as in Example 1. However, the size of the metal foil laminate was 60 mm × 133 mm.
An electrode terminal produced in the same manner as the sealing member 10 is prepared by welding a single metal foil laminate 62 having a laminated structure similar to the sealing wall 2 of Example 1 to a resin molded product 60 molded in the same manner as the frame 30. Using the sealing member 6 that is not provided (see FIG. 10B), the sealing member 6 is welded to one end of the cylindrical body 51 in the same manner as the welding of the sealing member 10 described below, and the end is sealed. did.

Necessary power storage elements were connected to the electrode terminals 4 a and 4 b of the sealing member 10, and the sealing member 10 was inserted from one end of the cylindrical body 51 to perform necessary processing as a power storage device. At the time of insertion, the position of the palm seal portion of the cylindrical body 51 was made the same as that in the first embodiment.
A pair of recesses 33 and 33 of the frame body 30 of the sealing member 10 are sandwiched between the airtight fixing members from the outside of the cylinder body 51, and the cylinder body 51 is pushed into and fixed to the recesses 33 and 33 so as to stick to the welding surface of the frame body 30. did.
Welding was performed by sandwiching the flat side surfaces 32 and 32 of the long side of the frame body 30 with a pair of hot plates from the outside of the cylinder body 51. The cylindrical body 51 was pushed into the recesses 33 and 33 with a pair of semicircular arc-shaped hot plates corresponding to the groove-shaped recesses, and was welded.
Corresponding to the recesses 33, 33 of the sealing member 10 and the chamfered portions of the ridges, the recesses 33, 33 and the chamfered portions thereof are formed of a pair of concave and convex heat plates similar to the numeral 3 in a plan view. Pressed from above 51, it was welded once again with the recesses 55, 55 of the cylinder 51. As a precaution, the corners were welded with a hot plate having a curved surface corresponding to the chamfered portion of the corner ridgeline.
As described above, the sealing member 10 was welded to one end of the cylindrical body 51 and the end portion was sealed.

  Thus, when the sealing member 10 and the sealing member 6 were welded to both ends of the cylindrical body 51, the concave portions 55 were also formed in the intermediate portion of the cylindrical body 51. However, depending on the thickness and rigidity of the cylinder 51, the formation of the recess 55 at the intermediate portion may be insufficient. In such a case, since the recesses 55 are formed at both ends of the cylindrical body 51 by the recesses 33 and 66 of the frame body 30 and the resin molded product 60, the intermediate recess 55 is pressed by pressing with a protruding strip member. Can be completed. When pressing with the ridge member, it is preferable to press the entire length direction including both ends of the cylinder 51 at a time.

In this way, the concave portion 55 is also formed in the middle portion of the cylinder 51, and the concave portion 55 of the cylinder 51 is formed in a groove shape continuous from one end to the other end, and the necessary storage element is accommodated. A power storage device container 50 of Example 4 shown in FIG.
Since the inner peripheral length of the cylindrical body 51 is sufficiently larger than the outer peripheral length of the sealing member 10, the sealing member 10 can be easily inserted. In addition, no cracks or tears in the metal foil were observed in the cylinder 51 at the joint between the cylinder 51 and the sealing member 10.

A sealing member 10A and a power storage device container 50A of Example 5 shown in FIG. 12 were produced in the same manner as in Example 4 except that the sealing wall 2 was produced in the same manner as in Example 2.
Further, a sealing member 10B and a power storage device container 50B of Example 6 shown in FIG. 13 were produced in the same manner as in Example 4 except that the sealing wall 2 was produced in the same manner as in Example 3.

As mentioned above, although this invention has been demonstrated based on suitable embodiment, this invention is not limited to this, A various change is possible.
For example, in the second embodiment, the electrode terminals may be fixed so as to be opposite to each other via the opening of the frame. In the third embodiment, the electrode terminals may be arranged and fixed vertically (in the short side direction of the frame).

DESCRIPTION OF SYMBOLS 1, 1A, 1B, 10, 10A, 10B ... Sealing member, 2 ... Sealing wall of sealing member, 21 ... Metal foil laminated body of sealing wall, 22 ... Joint sealing part of sealing wall, 23 ... Freedom of metal foil laminated body End 25, through hole in sealing wall, 26: airtight fixing part of sealing wall, 3 ... frame body of sealing member, 31 ... top surface of frame body, 32 ... side surface of frame body, 33 ... dent in frame body, 4 4a, 4b ... electrode terminal, 41 ... insulating layer of electrode terminal, 42 ... free end of insulating film, 5, 5A, 5B, 50, 50A, 50B ... container for power storage device, 51 ... cylindrical body of container for power storage device 55 ... Recess of cylindrical body, 6 ... Sealing member, 60 ... Resin molded product of sealing member, 62 ... Metal foil laminate of sealing member, 66 ... Recess of sealing member.

Claims (7)

A sealing member for sealing the opening by welding the inner surface to the inner surface of the opening of the weldable cylinder,
A sealing wall made of a metal foil laminate having a metal foil and a weld layer is welded to the top surface of the resin frame,
An electrode member is hermetically fixed to the sealing wall.   The sealing wall is formed by laminating and welding the edges of the two metal foil laminates in the form of a palm, and the electrode terminal is fixed to the sealing wall by a palm seal portion between the metal foil laminates. The sealing member according to 1.   The sealing member according to claim 2, wherein an insulating layer is laminated on the electrode terminal of the joint seal portion.   The sealing member according to claim 1, wherein an electrode terminal is fixed to the sealing wall by a welded portion between the sealing wall and the frame.   The sealing member of Claim 4 by which the insulating layer was laminated | stacked on the electrode terminal of the welding part of the said sealing wall and the said frame.   The sealing member according to claim 1, wherein an electrode terminal inserted into a through-hole provided in the sealing wall is fixed to the sealing wall with a resin layer covering the periphery thereof.   The sealing member according to any one of claims 1 to 6, wherein the inner surface is inserted and welded from one side or both ends of a cylindrical body made of a weldable metal foil laminate from the frame side. A container for a power storage device.

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