Sealed power storage device, its manufacturing method and disassembly method, case-reusable sealed power storage device and its manufacturing method

Abstract

To provide a sealed power storage device of which the metallic case main body and the lid body can be easily disassembled, in which a metal powder harmful for an electrode body is hard to be generated in the case of the disassembly and which facilitates recycling of the case main body and the lid body which are disassembled and the electrode body, a manufacturing method thereof, a disassembly method therefor, and further, a case recyclable sealed power storage device which utilizes the disassembled case main body and the lid body which are disassembled, and a manufacturing method thereof.SOLUTION: A sealed power storage device 10 comprises: an electrode body 1; a bottomed and cylindrical metal case main body 2 which includes an opening 21 and in which the electrode body is accommodated; an external connection terminal 3 which is electrically connected to the electrode body; and a metal lid body 4 which holds the external connection terminal and the electrode body via the external connection terminal and seals the opening of the metal case main body. The opening of the metal case main body and a peripheral edge part 41 of the metal lid body are hermetically coupled over an entire circumference via an annular resin frame body 5.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a sealed electricity storage device and a method for manufacturing the same and a method for disassembling the same, and to a case-reusable sealed electricity storage device and a method for manufacturing the same. [Background technology]

[0002] In recent years, with the spread of electric vehicles (EVs) and hybrid vehicles (HVs), sealed power storage devices including lithium-ion batteries have increased in number, and there is a growing need for technologies to effectively recycle these devices. For example, Patent Document 1 discloses a method for recycling used lithium-ion batteries. The method in Patent Document 1 involves discharging the lithium-ion batteries under specified conditions, disassembling the batteries, and recovering various metal materials. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-198320 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the lithium ion battery recycling method described in Patent Document 1 has the following problems. Specifically, in a lithium-ion battery, an electrode assembly consisting of a positive electrode and a negative electrode is generally housed in a metal (e.g., aluminum alloy) case body, and the opening of the case body is sealed with a metal lid from which electrode terminals protrude. Therefore, when disassembling a lithium-ion battery, it is necessary to separate and disassemble the metal case body and the lid (hereinafter, both of these are collectively referred to as "disassembly"). However, since the case body and the lid are typically joined by welding or the like, possible methods for disassembling the case body and the lid include cutting the vicinity of the joint between the case body and the lid with a cutting tool such as an end mill, or fusing with a laser beam or the like. However, both of these methods have the problem of generating fine metal powder when cutting the case body or the lid, which can become mixed with the electrode body and make the electrode body difficult to reuse. Furthermore, since the cut or fusing-off case body or the lid cannot be maintained in its original state, there is also the problem of how to reuse them.

[0005] The present invention has been made in consideration of these problems, and provides a sealed electricity storage device that can be easily disassembled into a metal case body and lid body, that is less likely to generate metal powder harmful to the electrode body during disassembly, and that allows the disassembled case body, lid body, and electrode body to be easily reused, a method for manufacturing the same, a disassembly method, and a case-recycling sealed electricity storage device that uses the disassembled case body and lid body, and a method for manufacturing the same. [Means for solving the problem]

[0006] (1) One aspect of the present invention for solving the above problem is a sealed electricity storage device comprising: an electrode body; a cylindrical metal case body having an opening and a bottom that houses the electrode body; an external connection terminal electrically connected to the electrode body; and a metal lid body that holds the electrode body via the external connection terminal and the external connection terminal and seals the opening of the metal case body, wherein the opening of the metal case body and the peripheral edge of the metal lid body are hermetically joined around the entire circumference via an annular resin frame body.

[0007] In this sealed energy storage device, the opening of the metal case body and the peripheral edge of the metal lid are hermetically connected around the entire circumference via a ring-shaped resin frame. Therefore, when disassembling the metal case body and the metal lid to reuse the sealed energy storage device, the metal case body and the metal lid can be easily separated and dismantled by cutting or melting the resin frame along the circumferential direction at a position spaced apart from the metal case body and the metal lid. Furthermore, because the metal case body and the metal lid are not cut or melted when the resin frame is cut or melted, metal powder harmful to the electrode body is less likely to be generated, making the electrode body easier to reuse. Furthermore, because the metal case body and the metal lid can be maintained in their original state even when the resin frame is cut or melted, the disassembled metal case body and the metal lid can be easily reused.

[0008] Therefore, according to the present invention, it is possible to provide a sealed energy storage device in which the metal case body and lid can be easily disassembled, metal powder harmful to the electrode body is less likely to be generated during disassembly, and the disassembled case body, lid body, and electrode body can be easily reused.

[0009] (2) In the sealed energy storage device described in (1), the resin frame may be formed of a thermoplastic resin having a heat-resistant temperature of 200°C or higher and a melting temperature lower than the melting temperatures of the metal case body and the metal lid.

[0010] In this sealed electricity storage device, the resin frame has a heat-resistant temperature of 200°C or higher, so airtightness inside the case can be ensured even if the internal temperature of the sealed electricity storage device rises to 200°C. Furthermore, in general, a safety mechanism that prevents thermal runaway is activated in a sealed electricity storage device before the internal temperature rises to 200°C, so deformation or damage to the resin frame can be avoided when the sealed electricity storage device is in use.

[0011] Furthermore, since the resin frame is formed of a thermoplastic resin whose melting temperature is lower than that of the metal case body and the metal lid, the resin frame is heated at a temperature lower than that of the metal case body and the metal lid, and in a molten state, is joined to the metal case body and the metal lid, and then cooled, thereby easily and airtightly joining the metal case body and the metal lid via the resin frame. Furthermore, the resin frame can also be injection molded (insert molding) by inserting the metal case body or the metal lid into a mold, and the resin frame and the metal case body or the metal lid can be easily joined simultaneously with molding the resin frame. This makes it possible to provide a sealed energy storage device that is simpler, safer, and more reliable.

[0012] (3) The sealed energy storage device according to (1) or (2) may be a sealed energy storage device in which the opening of the metal case body has a body-side treated surface around the entire periphery that strengthens the bonding strength with the resin, and the resin frame body is hermetically adhered to the body-side treated surface around the entire periphery.

[0013] In this sealed energy storage device, the opening of the metal case body has a body-side treated surface along its entire periphery that strengthens the bonding strength with the resin, and the resin frame is in airtight contact with the body-side treated surface along its entire periphery, thereby further increasing the bonding strength between the opening of the metal case body and the resin frame. Here, the body-side treated surface includes, for example, a treated surface that increases the area of ​​the abutment surface of the opening of the metal case body against the resin frame to strengthen the bonding strength mainly against static loads, a treated surface that forms the abutment surface in multiple directions to strengthen the bonding strength mainly against dynamic loads, and a treated surface that combines both of the above treated surfaces to strengthen the bonding strength against static loads and dynamic loads.

[0014] (4) The sealed energy storage device according to any one of (1) to (3) may be a sealed energy storage device in which the peripheral portion of the metal lid body has a lid-side treated surface around the entire periphery that strengthens the bonding strength with the resin, and the resin frame body is hermetically adhered to the lid-side treated surface around the entire periphery.

[0015] In this sealed energy storage device, the peripheral portion of the metal lid has a lid-side treated surface along the entire periphery that strengthens the bonding strength with the resin, and the resin frame is hermetically adhered to the lid-side treated surface along the entire periphery, thereby further increasing the bonding strength between the peripheral portion of the metal lid and the resin frame. Here, the lid-side treated surface includes, for example, a treated surface that increases the area of ​​the abutment surface of the peripheral portion of the metal lid against the resin frame to strengthen the bonding strength mainly against static loads, a treated surface that forms the abutment surface in multiple directions to strengthen the bonding strength mainly against dynamic loads, and a treated surface that combines both the above treated surfaces to strengthen the bonding strength against static loads and dynamic loads.

[0016] (5) The sealed energy storage device according to any one of (1) to (4), wherein the resin frame body may have a body-side resin part coupled to an opening of the metal case body, a lid-side resin part coupled to a peripheral edge of the metal lid body, and a separation-facilitating part located between the body-side resin part and the lid-side resin part, which facilitates separation of the resin frame body into the body-side resin part and the lid-side resin part.

[0017] In this sealed energy storage device, the resin frame has a body-side resin portion that is coupled to the opening of the metal case body, a lid-side resin portion that is coupled to the peripheral edge of the metal lid, and a separation-facilitating portion that is located between the body-side resin portion and the lid-side resin portion and that facilitates separation of the resin frame into the body-side resin portion and the lid-side resin portion. Therefore, the metal case body and the metal lid can be disassembled more quickly and easily by cutting or melting the separation-facilitating portion. Here, examples of the separation-facilitating portion include a melt-facilitating portion in which graphite particles or carbon-based fibers with good thermal conductivity are dispersed in a resin base material, and a notched portion with a recessed groove formed on the outer periphery.

[0018] Furthermore, since the body resin portion is bonded to the disassembled metal case body and the lid resin portion is bonded to the disassembled metal lid, the body resin portion and the lid resin portion can be shaped, heated, and welded together to easily reconnect the metal case body and the metal lid via the body resin portion and the lid resin portion, allowing the metal case body and the metal lid to be effectively reused.

[0019] (6) The sealed electricity storage device according to any one of (1) to (5) may be a sealed electricity storage device in which the outer peripheral surface of the resin frame has a light absorption facilitating portion that facilitates the absorption of heat rays.

[0020] In this sealed energy storage device, the outer peripheral surface of the resin frame has a light-absorption-facilitating portion that facilitates the absorption of heat rays. Therefore, the outer peripheral surface of the resin frame can be rapidly melted by irradiating the light-absorption-facilitating portion with heat rays, such as laser light or far-infrared rays, from the outside of the resin frame. Furthermore, heat rays, such as laser light or far-infrared rays, promote the movement of polymers in liquids more than in solids, improving light absorption. Therefore, when the light-absorption-facilitating portion on the outer peripheral surface is first melted by the heat rays, melting can be accelerated to the interior of the resin frame, allowing for more rapid decomposition of the metal case body and the metal lid. Here, the light-absorption-facilitating portion includes, for example, a finely textured shape or a black-colored portion.

[0021] (7) The sealed electricity storage device according to any one of (1) to (6) may be a sealed electricity storage device in which the metal lid body holds the external connection terminals, that is, a positive electrode external connection terminal and a negative electrode external connection terminal, via insulating members.

[0022] In this sealed energy storage device, the metal lid holds the external connection terminals, that is, the positive electrode external connection terminal and the negative electrode external connection terminal, via insulating members, respectively, so that the insulating members can reliably prevent a short circuit between the positive electrode external connection terminal and the negative electrode external connection terminal via the metal lid. Note that it is desirable that the melting temperature of this insulating member be higher than the melting temperature of the resin frame. This is because, when the peripheral edge of the metal lid and the resin frame are joined by heating and melting the resin frame, deformation, burn-through, etc. of the insulating member can be prevented even when the metal lid holds the external connection terminals via the insulating member.

[0023] (8) In the sealed electricity storage device according to any one of (1) to (6), the metal lid body may also serve as the positive external connection terminal, which is the external connection terminal, and may hold the negative external connection terminal, which is the external connection terminal, via an insulating member.

[0024] In this sealed energy storage device, the metal lid also serves as the positive electrode external connection terminal, which is an external connection terminal, so there is no need to interpose an insulating member between the metal lid and the positive electrode external connection terminal. This not only reduces the number of insulating member components, thereby reducing the labor required for processing and assembly, but also eliminates the need to replace deteriorated insulating members when reusing the sealed energy storage device. The positive electrode external connection terminal may be formed separately from the metal lid, or may be formed integrally with the metal lid.

[0025] (9) The sealed electricity storage device according to any one of (1) to (6), wherein the metal lid body also serves as the negative external connection terminal, which is the external connection terminal, and holds the positive external connection terminal, which is the external connection terminal, via an insulating member, may be a sealed electricity storage device.

[0026] In this sealed energy storage device, the metal lid also serves as the negative electrode external connection terminal, which is an external connection terminal, so there is no need to interpose an insulating member between the metal lid and the negative electrode external connection terminal. This not only reduces the number of insulating member components, thereby reducing the labor required for processing and assembly, but also eliminates the need to replace deteriorated insulating members when reusing this sealed energy storage device. The negative electrode external connection terminal may be formed separately from the metal lid, or may be formed integrally with the metal lid. Furthermore, when the negative electrode external connection terminal is formed integrally with the metal lid, it is desirable to separate the metal lid from the metal lid on the positive electrode external terminal side, which is made of a different metal material, and to interpose an inter-lid insulating member between the two metal lids to prevent electrolytic corrosion and the like.

[0027] (10) The sealed energy storage device according to any one of (7) to (9) may be a sealed energy storage device in which the terminal holding hole of the metal lid body that holds the external connection terminal via the insulating member and the outer peripheral surface of the external connection terminal that abuts against the insulating member each have a bonding strength strengthening treatment surface over the entire circumference that strengthens the bonding strength with the insulating member.

[0028] In this sealed energy storage device, the terminal holding hole of the metal lid body that holds the external connection terminal via the insulating member and the outer peripheral surface of the external connection terminal that abuts against the insulating member each have an adhesive strength-reinforcing treated surface around the entire periphery that strengthens the adhesive strength with the insulating member, thereby further increasing the adhesive strength between the terminal holding hole of the metal lid body and the insulating member, and between the outer peripheral surface of the external connection terminal and the insulating member. Here, the adhesive strength-reinforcing treated surface includes, for example, a treated surface that increases the area of ​​the abutting surface of the terminal holding hole of the metal lid body that abuts against the insulating member to strengthen the adhesive strength mainly against static loads, a treated surface that forms the abutting surface in multiple directions to strengthen the adhesive strength mainly against dynamic loads, and a treated surface that combines the above-mentioned treated surfaces to strengthen the adhesive strength against both dynamic and static loads. The bonding strength strengthening treated surface includes, for example, a treated surface in which the area of ​​the contact surface that contacts the insulating member on the outer peripheral surface of the external connection terminal is increased to strengthen the bonding strength mainly against static loads, a treated surface in which the contact surface is formed in multiple directions to strengthen the bonding strength mainly against dynamic loads, and a treated surface in which both of the above treated surfaces are formed in a composite manner to strengthen the bonding strength against dynamic loads and static loads.

[0029] (11) Another aspect of the present invention for solving the above problem is a method for manufacturing a sealed electricity storage device comprising: an electrode body; a bottomed, cylindrical metal case body having an opening and accommodating the electrode body; an external connection terminal electrically connected to the electrode body; and a metal lid body that holds the electrode body via the external connection terminal and the external connection terminal and seals the opening of the metal case body, wherein the opening of the metal case body and a peripheral portion of the metal lid body are airtightly joined all around via an annular resin frame, the method comprising: an accommodating step of accommodating the electrode body in the metal case body through the opening; and a sealing step of airtightly joining the opening of the metal case body and the peripheral portion of the metal lid body via the resin frame to seal the opening.

[0030] This method of manufacturing a sealed energy storage device includes an accommodation step of accommodating the electrode body within the metal case body through the opening, and a sealing step of airtightly joining the opening of the metal case body and the peripheral edge of the metal lid body via a resin frame to seal the opening.This makes it possible to easily manufacture a highly safe sealed energy storage device in which the metal case body accommodating the electrode body inside and the metal lid body holding the external connection terminals are airtightly joined by the resin frame.

[0031] Furthermore, by cutting or melting the resin frame along the circumferential direction at a position spaced apart from the metal case body and the metal lid, the metal case body and the metal lid can be easily separated and disassembled. Furthermore, since the metal case body and the metal lid are not cut or melted when the resin frame is cut or melted, metal powder harmful to the electrode body is less likely to be generated, making the electrode body easier to reuse. Furthermore, by cutting or melting the resin frame, the metal case body and the metal lid can be maintained in their original state, making it easier to reuse the disassembled metal case body and metal lid.

[0032] Therefore, according to another aspect of the present invention, it is possible to provide a method for manufacturing a sealed energy storage device that allows for easy manufacturing of a sealed energy storage device, easy disassembly of the metal case body and lid body, less generation of metal powder harmful to the electrode body during disassembly, and easy reuse of the disassembled case body, lid body, and electrode body.

[0033] (12) The method for manufacturing a sealed energy storage device according to (11) may also be a method for manufacturing a sealed energy storage device, wherein the sealing step is an opening joining step in which a lid-side resin frame body, which has been airtightly joined in advance to the peripheral portion of the metal lid body, is directly and airtightly joined to the opening of the metal case body.

[0034] In this method for manufacturing a sealed energy storage device, the sealing step is an opening joining step in which a lid-side resin frame, which has previously been airtightly joined to the peripheral edge of a metal lid, is directly and airtightly joined to the opening of the metal case body. This allows for a smaller and simpler manufacturing apparatus than when the metal lid, resin frame, and metal case body are joined together all at once. For example, the lid-side resin frame can be airtightly joined to the peripheral edge of the metal lid in advance by inserting the metal lid into a mold and performing injection molding (insert molding). Therefore, the heating apparatus used to join the lid-side resin frame to the opening of the metal case body in the opening joining step can be significantly smaller than the heating apparatus used when the metal lid, resin frame, and metal case body are joined together all at once.

[0035] (13) The method for manufacturing a sealed energy storage device according to (11) may also be a method for manufacturing a sealed energy storage device, wherein the sealing step is a peripheral joining step in which a body-side resin frame body, which has been airtightly joined in advance to the opening of the metal case body, is directly and airtightly joined to the peripheral part of the metal lid body.

[0036] In this method for manufacturing a sealed energy storage device, the sealing step is a peripheral joining step in which the body-side resin frame, which has previously been airtightly joined to the opening of the metal case body, is directly and airtightly joined to the peripheral edge of the metal lid. This allows for a smaller and simpler manufacturing apparatus than when the metal lid, resin frame, and metal case body are joined together all at once. For example, the body-side resin frame can be airtightly joined to the opening of the metal case body in advance by inserting the metal case body into a mold and performing injection molding (insert molding). Therefore, the heating apparatus used to join the body-side resin frame to the peripheral edge of the metal lid in the peripheral joining step can be significantly smaller than the heating apparatus used when the metal lid, resin frame, and metal case body are joined together all at once.

[0037] (14) In the method for manufacturing a sealed energy storage device described in (11), the sealing step may be an inter-frame joining step of airtightly joining a lid-side partial resin frame that has been airtightly joined in advance to the peripheral portion of the metal lid body and a body-side partial resin frame that has been airtightly joined in advance to the opening of the metal case body.

[0038] In this method for manufacturing a sealed energy storage device, the sealing step is an inter-frame joining step in which a lid-side partial resin frame, which has previously been airtightly joined to the peripheral edge of a metal lid, and a body-side partial resin frame, which has previously been airtightly joined to the opening of a metal case body, are airtightly joined together. This allows for a more compact and simplified manufacturing apparatus compared to joining the metal lid, resin frame, and metal case body all at once. For example, the lid-side partial resin frame can be airtightly joined to the peripheral edge of the metal lid by inserting the metal lid into a mold and performing injection molding (insert molding). The body-side partial resin frame can be airtightly joined to the opening of the metal case body by inserting the metal case body into a mold and performing injection molding (insert molding). Therefore, in the inter-frame joining step, only the joining surfaces between the lid-side partial resin frame and the body-side partial resin frame need to be heated and melted, and the heating apparatus can be significantly smaller than the heating apparatus used to join the metal lid, resin frame, and metal case body all at once.

[0039] (15) Yet another aspect of the present invention for solving the above problem is a method for disassembling a sealed energy storage device according to any one of (1) to (10), comprising: a dividing step of dividing the resin frame interposed between an opening of the metal case body and a peripheral edge of the metal lid into a body-side partial resin frame joined to the opening of the metal case body and a lid-side partial resin frame joined to the peripheral edge of the metal lid; and a removal step of removing the electrode body housed in the metal case body through the opening.

[0040] This method for disassembling a sealed energy storage device includes a dividing step for dividing a resin frame interposed between the opening of the metal case body and the peripheral edge of the metal lid into a body-side resin frame portion that is connected to the opening of the metal case body and a lid-side resin frame portion that is connected to the peripheral edge of the metal lid. Therefore, the metal case body and the metal lid can be easily separated and disassembled by cutting or melting the resin frame along the circumferential direction at a position spaced apart from the metal case body and the metal lid. Furthermore, when cutting or melting the resin frame, the metal case body and the metal lid are not cut or melted, so metal powder harmful to the electrode assembly is less likely to be generated. Furthermore, cutting or melting the resin frame allows the metal case body and the metal lid to be maintained in their original state.

[0041] Furthermore, since the method includes a removal step of removing the electrode assembly housed in the metal case body through the opening, the electrode assembly can be removed from the metal case body while being held by the metal lid and can be easily separated from the metal lid, allowing the metal case body, metal lid, and electrode assembly to be disassembled in a state that makes them easy to reuse.

[0042] Therefore, according to yet another aspect of the present invention, a method for disassembling a sealed energy storage device can be provided that allows for easy disassembly of the metal case body and lid body, reduces the generation of metal powder harmful to the electrode body during disassembly, and makes it easy to reuse the disassembled case body, lid body, and electrode body.

[0043] (16) The method for disassembling a sealed energy storage device according to (15) may be such that the dividing step is a melt-dividing step of melting a melt-separated portion of the resin frame that is separated from the metal case body and the metal lid body, while moving the metal lid body and the metal case body relative to each other in a direction separating them, thereby dividing the resin frame into the body-side partial resin frame and the lid-side partial resin frame.

[0044] In this method for disassembling a sealed energy storage device, the dividing step involves melting a melt-separated portion of the resin frame that is separated from the metal case body and the metal lid, while moving the metal lid and the metal case body relative to each other in the separating direction, thereby dividing the resin frame into a body-side partial resin frame and a lid-side partial resin frame. Therefore, the device can be easily disassembled into the metal case body to which the body-side partial resin frame is joined and the metal lid to which the lid-side partial resin frame is joined. Furthermore, since the metal case body and the metal lid are not melted or cut when the resin frame is melted, metal powder harmful to the electrode assembly is less likely to be generated. Furthermore, melting the resin frame allows the metal case body and the metal lid to be maintained in their original state. The melting method for dividing the resin frame into the body-side partial resin frame and the lid-side partial resin frame is preferably a method in which a heated thin-plate hot blade or laser light is applied to or near the boundary between the body-side partial resin frame and the lid-side partial resin frame to melt the boundary along the boundary.

[0045] (17) The method for disassembling a sealed energy storage device according to (15) may be a cutting and dividing step in which a cutting and separating portion of the resin frame body that is spaced apart from the metal case body and the metal lid body is cut around the entire circumference to divide the resin frame body into the body-side partial resin frame body and the lid-side partial resin frame body.

[0046] In this method for disassembling a sealed energy storage device, the dividing step involves cutting the resin frame along the entire circumference of a cutting separation portion that is spaced apart from the metal case body and the metal lid to divide the resin frame into a body-side partial resin frame and a lid-side partial resin frame. Therefore, the metal case body to which the body-side partial resin frame is joined and the metal lid to which the lid-side partial resin frame are joined can be easily disassembled. Furthermore, because the metal case body and the metal lid are not cut when the resin frame is cut, metal powder harmful to the electrode assembly is less likely to be generated. Furthermore, cutting the resin frame allows the metal case body and the metal lid to be maintained in their original state. Note that a preferred cutting method for dividing the resin frame into the body-side partial resin frame and the lid-side partial resin frame involves cutting along the boundary line between the body-side partial resin frame and the lid-side partial resin frame using a saw-like cutting blade or a drill-like end mill, etc., by cutting along the boundary line or the vicinity thereof (the cutting separation portion).

[0047] (18) Yet another aspect of the present invention for solving the above-described problems is a case-recycling sealed electricity storage device comprising: an electrode body; a resin-framed metal case body that is a cylindrical metal case body having an opening and a bottom that houses the electrode body, the resin-framed metal case body having a body-side partial resin frame joined around the entire periphery of the opening; external connection terminals electrically connected to the electrode body; and a metal lid that holds the electrode body via the external connection terminals and the external connection terminals, the resin-framed metal lid being joined around the entire periphery of the periphery, the opening of the metal case body and the periphery of the metal lid being airtightly joined around the entire periphery via a composite resin frame that joins the annular body-side partial resin frame and the lid-side partial resin frame; and Here, the above-mentioned "metal case body with recycled resin frame" and "metal lid body with recycled resin frame" include those obtained by dividing the resin frame of a manufactured sealed power storage device, which includes a metal case body and a metal lid body, in which the opening of the metal case body and the peripheral portion of the metal lid body are airtightly joined around the entire circumference via a ring-shaped resin frame, into a body-side partial resin frame that is joined to the opening of the metal case body and a lid-side partial resin frame that is joined to the peripheral portion of the metal lid.Furthermore, the "metal case body with recycled resin frame" and the "metal lid body with recycled resin frame" also include those obtained by dividing the composite resin frame of the above-mentioned manufactured case-reused sealed power storage device into a body-side partial resin frame that is joined to the opening of the metal case body and a lid-side partial resin frame that is joined to the peripheral portion of the metal lid.

[0048] This case-recycling sealed energy storage device includes a resin-framed metal case body to which a body-side partial resin frame is joined around the entire periphery of an opening, external connection terminals electrically connected to the electrode body, and a resin-framed metal lid that seals the opening of the resin-framed metal case body, the resin-framed metal lid being a metal lid that holds the electrode body via the external connection terminals and the external connection terminals, and to which the lid-side partial resin frame is joined around the entire periphery of the peripheral portion. Furthermore, because the resin-framed metal case body is at least one of a recycled resin-framed metal case body and a recycled resin-framed metal lid, it is possible to effectively utilize the recycled resin-framed metal case body and / or the recycled resin-framed metal lid obtained by dividing the resin frame of a manufactured sealed energy storage device or the composite resin frame of a manufactured case-recycling sealed energy storage device.

[0049] In addition, in this case-reusable sealed energy storage device, the opening of the metal case body and the peripheral edge of the metal lid are hermetically joined around the entire circumference via a composite resin frame that combines an annular body-side partial resin frame and a lid-side partial resin frame. Therefore, when re-disassembling the metal case body and the metal lid, the metal case body and the metal lid can be easily separated and disassembled by cutting or melting the composite resin frame along the circumferential direction at or near the boundary between the annular body-side partial resin frame and the lid-side partial resin frame. Furthermore, because cutting or melting the composite resin frame does not cut or melt the metal case body and the metal lid, metal powder harmful to the electrode assembly is less likely to be generated, facilitating reuse of the electrode assembly. Furthermore, because the metal case body and the metal lid can be maintained in their original state even when the composite resin frame is cut or melted, the disassembled metal case body and the metal lid can be easily reused.

[0050] Therefore, according to yet another aspect of the present invention, a case-reusable sealed energy storage device can be provided in which the metal case body and lid can be easily disassembled, metal powder harmful to the electrode body is less likely to be generated during disassembly, and the disassembled case body, lid, and electrode body can be easily reused.

[0051] (19) Yet another aspect of the present invention for solving the above problem is a method for manufacturing a case-reused sealed energy storage device as described in (18), which includes an accommodating step of accommodating the electrode body in the metal case body through the opening, and a sealing step of airtightly bonding the body-side partial resin frame body and the lid-side partial resin frame body to form the composite resin frame body and airtightly sealing the opening.

[0052] This method of manufacturing a case-reused sealed energy storage device includes an accommodation step of accommodating the electrode body within the metal case body through the opening to which the body-side partial resin frame is joined, and a sealing step of airtightly joining the body-side partial resin frame and the lid-side partial resin frame to form a composite resin frame and airtightly sealing the opening.Therefore, it is possible to easily manufacture a case-reused sealed energy storage device in which the metal case body accommodating the electrode body inside and the metal lid body holding the external connection terminals are airtightly joined by the composite resin frame.

[0053] Furthermore, when disassembling the case-reusable sealed energy storage device again, the metal case body and the metal lid can be easily separated and disassembled again by cutting or melting the composite resin frame, for example, along the circumferential direction at or near the boundary between the body-side partial resin frame and the lid-side partial resin frame. Furthermore, since the metal case body and the metal lid are not cut or melted when the composite resin frame is cut or melted, metal powder harmful to the electrode body is less likely to be generated, making it easier to reuse the electrode body. Furthermore, since the metal case body and the metal lid can be maintained in their original state by cutting or melting the composite resin frame, the disassembled metal case body and the metal lid can be easily reused.

[0054] Therefore, according to yet another aspect of the present invention, it is possible to provide a method for manufacturing a case-reusable sealed energy storage device that allows for easy manufacture of a case-reusable sealed energy storage device, allows for easy disassembly of the metal case body and lid body, makes it difficult for metal powder harmful to the electrode body to be generated during disassembly, and makes it easy to reuse the disassembled case body, lid body, and electrode body.

[0055] (20) In the manufacturing method of a case-reused sealed energy storage device described in (19), the metal case body with a resin frame may be a metal case body with a recycled resin frame, and the manufacturing method of a case-reused sealed energy storage device may include a body-side partial resin frame shaping step of shaping the body-side partial resin frame joined to the opening of the metal case body into a predetermined shape prior to the accommodation step.

[0056] In this method for manufacturing a case-reusable sealed energy storage device, the resin-framed metal case body is a recycled resin-framed metal case body, and the method includes a body-side partial resin frame shaping step of shaping the body-side partial resin frame coupled to the opening of the metal case body into a predetermined shape prior to the accommodating step, so that when the resin frame or composite resin frame is cut or melted, for example, circumferentially at a position spaced apart from the metal case body and the metal lid to reuse the sealed energy storage device or the case-reusable sealed energy storage device, any irregularities that occur in the body-side partial resin frame can be reshaped into a regular shape. Therefore, in the sealing step, the opening can be sealed more airtightly by the composite resin frame formed by combining the body-side partial resin frame and the lid-side partial resin frame that have been shaped into the regular shape.

[0057] (21) In the manufacturing method of the case-reused sealed energy storage device described in (19), the metal lid body with resin frame may be the metal lid body with the recycled resin frame, and the manufacturing method of the case-reused sealed energy storage device may include a lid-side partial resin frame shaping step of shaping the lid-side partial resin frame joined to the peripheral portion of the metal lid body into a predetermined shape prior to the accommodation step.

[0058] In this method for manufacturing a case-reused sealed energy storage device, the resin-framed metal lid is a metal lid with a reusable resin frame, and the method includes a lid-side partial resin frame shaping step of shaping the lid-side partial resin frame joined to the peripheral edge of the metal lid into a predetermined shape prior to the housing step, so that when the resin frame or composite resin frame is cut or melted along the circumferential direction at a position spaced apart from the metal case body and the metal lid to reuse the sealed energy storage device or the case-reused sealed energy storage device, an uneven shape that occurs in the lid-side partial resin frame can be reshaped into a regular shape. Therefore, in the sealing step, the opening can be sealed more airtightly by the composite resin frame formed by joining the lid-side partial resin frame shaped into the regular shape and the body-side partial resin frame. [Effects of the Invention]

[0059] According to the present invention, it is possible to provide a sealed energy storage device in which the metal case body and lid body can be easily disassembled, metal powder harmful to the electrode body is not easily generated during disassembly, and the disassembled case body, lid body, and electrode body can be easily reused, a method for manufacturing the same, and a disassembly method, as well as a case-recycling sealed energy storage device that uses the disassembled case body and lid body and a method for manufacturing the same. [Brief explanation of the drawings]

[0060] [Figure 1] 1A and 1B are perspective views of one embodiment of a sealed power storage device and one embodiment of a case-reused sealed power storage device according to the present embodiment. [Figure 2] 2 is an exploded perspective view of the sealed electricity storage device and the case-reuse sealed electricity storage device shown in FIG. 1. FIG. [Figure 3] 2 is a partial cross-sectional view taken along line AA (partial cross-sectional view taken along line BB) of the sealed electricity storage device shown in FIG. [Figure 4] 2 is a partial cross-sectional view taken along line AA (partial cross-sectional view taken along line BB) of a first modified embodiment of the sealed electricity storage device shown in FIG. [Figure 5A] FIG. 5 is an enlarged cross-sectional view of a portion D shown in FIG. 4 according to a first modification. [Figure 5B] FIG. 5 is an enlarged cross-sectional view of a portion D shown in FIG. 4 according to a second modification. [Figure 6A] 5 is a schematic cross-sectional view showing an example of a method for applying a treated surface to strengthen the bonding strength with a resin in the first modified embodiment of the sealed electricity storage device shown in FIG. 4. FIG. [Figure 6B] 6B is a schematic cross-sectional view of a state in which a resin frame and the like are bonded to a treated surface formed by the construction method shown in FIG. 6A. FIG. [Figure 7] 2 is a partial cross-sectional view taken along line AA (partial cross-sectional view taken along line BB) of a second modified embodiment of the sealed electricity storage device shown in FIG. [Figure 8] 2 is a partial cross-sectional view taken along the line AA (partial cross-sectional view taken along the line BB) of Modification 1 of Modification 2 of the sealed electricity storage device shown in FIG. [Figure 9A] FIG. 9 is an enlarged cross-sectional view of a further modified example 2 at a portion E shown in FIG. 8. [Figure 9B] FIG. 9 is an enlarged cross-sectional view of a further modified example 3 in a portion E shown in FIG. 8. [Figure 10] 2 is a cross-sectional view of a portion AA in a third modified embodiment of the sealed electricity storage device shown in FIG. 1. FIG. [Figure 11] 1. FIG. 5 is a cross-sectional view of a BB portion of a third modified embodiment of the sealed electricity storage device shown in FIG. [Figure 12] 1. FIG. 4 is a cross-sectional view of the CC portion of a third modified example of the sealed electricity storage device shown in FIG. [Figure 13A] FIG. 2 is a process chart of a basic type illustrating a method for manufacturing the sealed electricity storage device shown in FIG. [Figure 13B] 1. FIG. 4 is a process chart illustrating a first modification of a method for manufacturing the sealed electricity storage device shown in FIG. [Figure 13C] 1. FIG. 6 is a process chart illustrating a second modified example of a method for manufacturing the sealed electricity storage device shown in FIG. [Figure 13D] 1. FIG. 6 is a process chart illustrating a third modified example of a method for manufacturing the sealed electricity storage device shown in FIG. [Figure 14] FIG. 13B is a schematic perspective view showing an example of a heating device used in the sealing step shown in FIG. 13A. [Figure 15] FIG. 13C is a schematic perspective view showing an example of a heating device used in the sealing step (opening joining step) shown in FIG. 13B. [Figure 16]FIG. 13D is a schematic perspective view showing an example of a heating device used in the sealing step (peripheral edge joining step) shown in FIG. 13C. [Figure 17] FIG. 13E is a schematic perspective view showing an example of a heating device used in the sealing step (inter-frame joining step) shown in FIG. 13D. [Figure 18A] FIG. 2 is a process chart of a basic type illustrating a method for disassembling the sealed electricity storage device shown in FIG. [Figure 18B] 1. FIG. 4 is a process chart of a first modification illustrating a method for disassembling the sealed electricity storage device shown in FIG. [Figure 18C] 1. FIG. 6 is a process chart illustrating a second modification of the disassembly method for the sealed electricity storage device shown in FIG. [Figure 19] 19 is a cross-sectional view of the sealed electricity storage device shown in FIG. 1 taken along the line AA, showing the state before disassembly by the disassembly method shown in FIG. 18. FIG. [Figure 20] 2 is a cross-sectional view of the AA portion of the case-reuse sealed electricity storage device shown in FIG. 1. FIG. [Figure 21A] FIG. 2 is a basic type process diagram illustrating a method for manufacturing the case-reused sealed electricity storage device shown in FIG. [Figure 21B] 1. FIG. 4 is a process chart illustrating a first modification of a method for manufacturing the case-reused sealed electricity storage device shown in FIG. [Figure 21C] 1. FIG. 6 is a process chart illustrating a second modification of the method for manufacturing the case-reused sealed electricity storage device shown in FIG. [Figure 22] FIG. 21B is a schematic perspective view showing an example of a heating device used in the sealing step shown in FIGS. 21A, 21B, and 21C. DETAILED DESCRIPTION OF THE INVENTION

[0061] <Sealed electricity storage device according to this embodiment> Next, one aspect of a sealed energy storage device 10 according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3. FIG. 1 shows a perspective view of one aspect of a sealed energy storage device according to the present embodiment. FIG. 2 shows an exploded perspective view of the sealed energy storage device shown in FIG. 1. FIG. 3 shows a partial cross-sectional view taken along line AA (partial cross-sectional view taken along line BB) of the sealed energy storage device shown in FIG. 1. In the following description, for convenience of explanation, the directions of the sealed energy storage device may be described using the directions of arrows shown in FIG. 2. Specifically, arrow U indicates the upper direction, arrow D indicates the lower direction, arrow R indicates the right direction, arrow L indicates the left direction, arrow F indicates the front direction, and arrow Rr indicates the rear direction. However, the directions of the arrows do not limit the installation mode of the sealed energy storage device, etc.

[0062] As shown in FIGS. 1 to 3 , one aspect of a sealed energy storage device 10 according to this embodiment includes an electrode assembly 1 and a cylindrical metal case body 2 having an opening 21 and a bottom that houses the electrode assembly 1. Here, the sealed energy storage device 10 refers to any energy storage device in which the electrode assembly 1 is housed in a sealed case and from which electrical energy can be extracted, including, for example, primary batteries, secondary batteries, and electric double layer capacitors. The electrode assembly 1 is configured by a positive electrode sheet and a negative electrode sheet (not shown) that are wound flat with a separator sheet sandwiched between them. However, the configuration is not limited thereto, and may be, for example, a configuration in which positive electrode sheets and negative electrode sheets are alternately stacked with a separator sheet sandwiched between them. Furthermore, the metal case body 2 is formed as a flat rectangular parallelepiped container made of, for example, aluminum or an aluminum alloy, but may also be formed of a metal other than aluminum.

[0063] The sealed electricity storage device 10 also includes an external connection terminal 3 electrically connected to the electrode assembly 1, and a metal lid 4 that holds the electrode assembly 1 via the external connection terminal 3 and the external connection terminal 3 and seals the opening 21 of the metal case body 2. Here, the external connection terminal 3 is composed of a positive electrode external connection terminal 3A connected to the current collecting foil of the positive electrode sheet of the electrode assembly 1, and a negative electrode external connection terminal 3B connected to the current collecting foil of the negative electrode sheet of the electrode assembly 1.

[0064] The positive electrode external connection terminal 3A and the negative electrode external connection terminal 3B each include an internal terminal 32 connected to the electrode body 1 inside the metal case body 2, and an external terminal 34 whose upper end projects to the outside of the metal lid 4. The upper end 31 of the internal terminal 32 is connected to the lower end of the external terminal 34 via a screw or the like (not shown). The connection structure between the internal terminal 32 and the external terminal 34 is not particularly limited, and may be a connection structure using ultrasonic welding, friction welding, or the like, for example.

[0065] The metal lid 4 is formed as a flat plate made of, for example, aluminum or an aluminum alloy, but may be formed of a metal other than aluminum. Terminal holding holes 42 are formed near both left and right ends of the metal lid 4, which hold the positive electrode external connection terminal 3A and the negative electrode external connection terminal 3B via insulating members 6 (6A, 6B). The positive electrode external connection terminal 3A is formed of, for example, aluminum or an aluminum alloy, and the negative electrode external connection terminal 3B is formed of, for example, copper or a copper alloy. The terminal holding holes 42 in the metal lid 4 are formed rectangular and are configured to fit the insulating members 6 (6A, 6B). The metal lid 4 is also formed with a known safety valve 43 and an electrolyte injection hole 44. The injection hole 44 is sealed with a plug (not shown). The safety valve 43 functions as a safety mechanism against thermal runaway and the like.

[0066] Here, the metal lid 4 holds the external connection terminals 3, i.e., the positive external connection terminal 3A and the negative external connection terminal 3B, via the insulating members 6 (6A, 6B), respectively, and the insulating members 6 (6A, 6B) can reliably prevent a short circuit between the positive external connection terminal 3A and the negative external connection terminal 3B via the metal lid 4. The insulating members 6 (6A, 6B) are preferably formed, for example, from an insulating resin, and their melting temperature is higher than that of the resin frame 5. This is because, when the peripheral edge 41 of the metal lid 4 and the resin frame 5 are joined by heating and melting the resin frame 5, deformation, burn-through, etc. of the insulating members 6 (6A, 6B) can be prevented even when the metal lid 4 holds the external connection terminals 3 via the insulating members 6 (6A, 6B).

[0067] In the sealed energy storage device 10, the opening 21 of the metal case body 2 and the peripheral edge 41 of the metal lid 4 are airtightly joined around the entire periphery via the annular resin frame 5. The joining structure of the annular resin frame 5 to the opening 21 of the metal case body 2 and the peripheral edge 41 of the metal lid 4 is not particularly limited. For example, they may be joined via an adhesive or via a mechanical fitting structure. The resin frame 5 may be formed in an annular shape while being joined to the opening 21 of the metal case body 2 and the peripheral edge 41 of the metal lid 4. For example, separately divided resin frames may be used to join the opening 21 of the metal case body 2 and the peripheral edge 41 of the metal lid 4. The resin frame 5 may be formed by laminating multiple resins of the same type or different types. In Figure 3, the shape of the opening 21 of the metal case body 2 to be joined to the resin frame body 5 and the shape of the peripheral portion 41 of the metal lid body 4 are each formed into a flat surface, but as will be described later, they do not need to be limited to a flat surface.

[0068] In the above-described sealed electricity storage device 10, the opening 21 of the metal case body 2 and the peripheral edge 41 of the metal lid body 4 are airtightly joined around the entire periphery via the annular resin frame 5. Therefore, when disassembling the metal case body 2 and the metal lid body 4 to reuse a used sealed electricity storage device 10, the metal case body 2 and the metal lid body 4 can be easily separated and dismantled by cutting or melting the resin frame 5 along the circumferential direction at a position spaced apart from the metal case body 2 and the metal lid body 4.

[0069] Furthermore, when the resin frame 5 is cut or melted, the metal case body 2 and the metal lid body 4 are not cut or melted, so metal powder that is harmful to the electrode body 1 is less likely to be produced, making it easy to reuse the electrode body 1. Furthermore, even if the resin frame 5 is cut or melted, the metal case body 2 and the metal lid body 4 can be maintained in their original state, making it easy to reuse the disassembled metal case body 2 and metal lid body 4.

[0070] Therefore, according to the sealed energy storage device 10 of this embodiment, the metal case body 2 and lid body 4 can be easily disassembled, and metal powder that is harmful to the electrode body 1 is less likely to be generated during disassembly, making it possible to provide a sealed energy storage device 10 in which the disassembled case body 2, lid body 4, and electrode body 1 can be easily reused.

[0071] In addition, in the present sealed electricity storage device 10, the resin frame 5 is preferably formed from a thermoplastic resin having a heat-resistant temperature of 200°C or higher and a melting temperature lower than the melting temperatures of the metal case body 2 and the metal lid 4. Here, the "heat-resistant temperature" refers to the maximum temperature at which the device can be used continuously.

[0072] In this case, since the resin frame 5 has a heat-resistant temperature of 200°C or higher, the airtightness of the case can be ensured even if the internal temperature of the sealed electricity storage device 10 rises to 200°C. Furthermore, in general, a safety mechanism (such as a safety valve 43) that prevents thermal runaway is activated in a sealed electricity storage device before the internal temperature rises to 200°C. Therefore, if the resin frame 5 has a heat-resistant temperature of 200°C or higher, deformation or damage to the resin frame 5 can be avoided when the sealed electricity storage device 10 is in use.

[0073] Furthermore, since the resin frame 5 is formed of a thermoplastic resin whose melting temperature is lower than that of the metal case body 2 and the metal lid 4, the resin frame 5 is heated at a temperature lower than that of the metal case body 2 and the metal lid 4, and in a molten state, joined to the metal case body 2 and the metal lid 4. After that, by cooling, the metal case body 2 and the metal lid 4 can be precisely and airtightly joined via the resin frame 5 while minimizing thermal deformation of the metal case body 2 and the metal lid 4. The resin frame 5 can also be injection molded (insert molding) by inserting the metal case body 2 or the metal lid 4 into a mold, and the resin frame 5 can be easily joined to the metal case body 2 or the metal lid 4 simultaneously with molding the resin frame 5. This makes it possible to provide a sealed electricity storage device 10 that is more precise, safer, and more reliable.

[0074] More specifically, the resin frame 5 is preferably formed from a crystalline resin that has excellent heat resistance, chemical resistance, insulating properties, durability, dimensional stability, and the like. For example, polyphenylene sulfide (PPS) resin can be used. PPS resin, which is a crystalline resin, is a thermoplastic resin with a heat resistance temperature of 220 to 240°C and a melting temperature of 280 to 290°C, which is lower than the melting temperature (approximately 500 to 600°C) of the metal (e.g., aluminum or aluminum alloy) used for the metal case body 2 and the metal lid 4. Furthermore, PPS resin can also improve its impact resistance by containing reinforcing fibers such as glass fiber. Therefore, in a sealed power storage device 10 used in a mobile object such as an automobile, the annular resin frame 5 is preferably formed from PPS resin containing reinforcing fibers such as glass fiber to improve durability and safety against vibrations from the road surface during driving and collision accidents.

[0075] <Modification 1 of the sealed electricity storage device> The above-described sealed energy storage device 10 can be modified into various variations without departing from the spirit of the invention. A first variation of the sealed energy storage device 10 will be described below with reference to FIGS. 4 to 6B. FIG. 4 shows a partial cross-sectional view taken along the line AA (partial cross-sectional view taken along the line BB) of the first variation of the sealed energy storage device shown in FIG. 1. FIG. 5A shows an enlarged cross-sectional view of the first variation of the section D shown in FIG. 4. FIG. 5B shows an enlarged cross-sectional view of the second variation of the section D shown in FIG. 4. FIG. 6A shows a schematic cross-sectional view illustrating an example of a method for applying a treated surface to enhance bonding strength with resin in the first variation of the sealed energy storage device shown in FIG. 4. FIG. 6B shows a schematic cross-sectional view of a state in which a resin frame or the like is bonded to the treated surface formed by the application method shown in FIG. 6A.

[0076] 4 to 6B, in sealed electricity storage devices 10B and 10C of modified embodiment 1, opening 21 of metal case main body 2 has, over the entire periphery, main body-side treated surface 21K that strengthens the bonding strength with the resin, and resin frame 5B is in airtight contact with main body-side treated surface 21K over the entire periphery. Here, main body-side treated surface 21K includes, for example, an area-enlarged treated surface 21K1 that enlarges the area of ​​the contact surface of opening 21 of metal case main body 2 with resin frame 5B to strengthen the bonding strength, and an uneven-shape treated surface 21K2 that forms an uneven shape with an engaging effect on the contact surface to strengthen the bonding strength, and both of these treated surfaces may be formed in a composite manner.

[0077] For example, as shown in FIG. 4 , the main body-side treated surface 21K of the sealed energy storage device 10B of Modification 1 is an area-enlarged treated surface 21K1 in which the cross-sectional shape of the opening 21 of the metal case main body 2 at the contact surface with the resin frame 5B is formed in a stepped shape, thereby enlarging the area of ​​the flat surface at the contact surface of the opening 21 of the metal case main body 2 with the resin frame 5B and strengthening the bonding strength. In this case, the bonding strength per unit area remains unchanged, but the overall bonding strength can be increased. Alternatively, the entire area-enlarged treated surface 21K1 may be formed with a fine uneven shape having an engaging effect to form an unevenly shaped surface 21K2 that strengthens the bonding strength. In this case, the bonding strength per unit area is also increased, further increasing the overall bonding strength. Note that, while an example in which the cross-sectional shape of the opening 21 of the metal case main body 2 is formed in a stepped shape is shown here, the area-enlarged treated surface 21K1 is not limited to this.

[0078] 5A , the main body-side treated surface 21K of the sealed power storage device 10B of Modification 1 may be a modified example 1 in which the cross-sectional shape of the opening 21 of the metal case main body 2 at the contact surface with the resin frame 5B is formed in a stepped shape to form an area-enlarged treated surface 21K1 having multiple flat surfaces, and the uneven surface 21K2 in which a fine uneven shape that provides an engaging effect is formed on a portion of the flat surface to strengthen the bonding force. In this case, the area-enlarged treated surface 21K1 and the uneven surface 21K2 work together while fulfilling their respective roles to effectively act against both static and dynamic loads. For example, even if an impact dynamic load acts on the sealed power storage device 10B, the area-enlarged treated surface 21K1 mainly absorbs the dynamic load, thereby preventing damage or destruction of the fine uneven shape of the uneven surface 21K2. In particular, the ultra-fine, tree-like unevenness JR (see FIG. 6) on the nanometer order on the main body side treated surface 21K, which will be described later, is easily damaged by impact loads, and is therefore effective in protecting it.

[0079] 5B , the main body-side treated surface 21K of the sealed electricity storage device 10C of Modification 1 may be modified as Modification 2, in which the cross-sectional shape of the opening 21 of the metal case main body 2 at the contact surface with the resin frame 5C is formed by combining an area-enlarged treated surface 21K1 in which a plurality of trapezoidal grooves 21M that are wider from the base end to the tip end are formed with gaps therebetween, and an unevenly shaped surface 21K2 in which a fine uneven shape that has an engaging effect is formed on the flat surface connecting to the tip end of the trapezoidal grooves 21M to strengthen the bonding force. In this case, particularly when the pressure inside the case increases and a load acts in a direction that peels the metal lid 4 from the opening 21 of the metal case main body 2, the inclined surface of the area-enlarged treated surface 21K1 formed on the trapezoidal grooves 21M can effectively resist the load. 5B, the trapezoidal groove 21M is formed along the circumferential direction of the opening 21 of the metal case body 2, but the trapezoidal groove 21M may be formed along the inner and outer directions of the opening 21 of the metal case body 2. The resin frame 5C can be easily formed by inserting the metal case body 2 into a mold and performing injection molding (insert molding).

[0080] Although the fine irregularities on the textured surface 21K2 may be formed by sandblasting or chemical etching, the ultrafine irregularities JR on the nanometer order are preferably formed by the method shown in FIG. 6A. Specifically, as shown in FIG. 6A, pulsed laser light LZ is irradiated onto the surface of the opening 21 of the metal case body 2, dispersing a fine mist of metal vapor. The mist of metal vapor floats in the air and accumulates in a forest-like pattern on the surface of the opening 21 of the metal case body 2. The accumulated forest-like metal vapor solidifies, forming an ultrafine irregularity JR with a nanometer-order irregularity height. Then, as shown in FIG. 6B, the contact surface of the resin frame 5 is joined to the surface of the opening 21 of the metal case body 2 in a molten state. At this time, the molten resin of the resin frame 5 penetrates into the gaps in the ultrafine irregularities JR and solidifies, airtightly bonding the resin frame 5 to the surface of the opening 21 of the metal case body 2.

[0081] However, the ultrafine concave-convex shape JR accumulated in a forest-like pattern has a tendency to easily detach from the surface of the opening 21 of the metal case body 2 when an impact external force (tensile stress) is applied. For this reason, it is desirable to form a compressive layer AS on the surface of the opening 21 of the metal case body 2 by performing shot peening or the like, and then irradiate the surface with pulsed laser light LZ. In this case, even if an external force (tensile stress) acts on the ultrafine concave-convex shape JR accumulated in a forest-like pattern, the external force (tensile stress) is canceled out by the compressive stress inherent in the compressive layer AS, thereby preventing detachment and damage to the ultrafine concave-convex shape JR. Furthermore, by performing shot peening or the like on the surface of the opening 21 of the metal case body 2, surface impurities can be removed, thereby increasing the bonding strength of the ultrafine concave-convex shape JR to the surface of the opening 21 of the metal case body 2.

[0082] 4, in the sealed electricity storage device 10B of this modified embodiment 1, it is preferable that the peripheral portion 41 of the metal lid 4 has a lid-side treated surface 41K over the entire periphery that strengthens the bonding strength with the resin, and the resin frame 5 is in airtight contact with the lid-side treated surface 41K over the entire periphery. Here, the lid-side treated surface 41K has an area-enlarged treated surface 41K1 and a textured surface 41K2, and is formed in the same manner as the body-side treated surface 21K of the opening 21 of the metal case body 2 described above. In this case, too, for the same reasons as above, the bonding strength between the peripheral portion 41 of the metal lid 4 and the resin frame 5 can be further increased.

[0083] In addition, in the sealed electricity storage device 10B of this modified embodiment 1, as shown in FIG. 4 , the terminal holding holes 42 of the metal lid 4 that hold the external connection terminals 3 (3A, 3B) via the insulating members 6 (6A, 6B) and the outer peripheral surfaces 33 of the external connection terminals 3 (3A, 3B) that abut against the insulating members 6 (6A, 6B) preferably have bond-strengthening treated surfaces 42K, 33K over the entire periphery, respectively, that strengthen the bond with the insulating members 6 (6A, 6B). Here, the bond-strengthening treated surfaces 42K, 33K are formed on bonding surfaces with an L-shaped cross section, and preferably have an area-enlarged treated surface and a textured surface, similar to the bond-strengthening treated surface 21K of the opening 21 of the metal case body 2 described above. In this case, too, for the same reasons as above, the bonding strength between the outer peripheral surfaces 33 of the external connection terminals 3 (3A, 3B) and the terminal holding holes 42 of the metal lid 4 and the insulating members 6 (6A, 6B) can be further increased.

[0084] <Modification 2 of the sealed electricity storage device> Next, modified example 2 of the above-described present sealed electricity storage device 10 will be described with reference to Figs. 7 to 9B. Fig. 7 shows a partial cross-sectional view taken along line AA (partial cross-sectional view taken along line BB) of modified example 2 of the sealed electricity storage device shown in Fig. 1. Fig. 8 shows a partial cross-sectional view taken along line AA (partial cross-sectional view taken along line BB) of modified example 1 of modified example 2 of the sealed electricity storage device shown in Fig. 1. Fig. 9A shows an enlarged cross-sectional view of part E shown in Fig. 8 of further modified example 2. Fig. 9B shows an enlarged cross-sectional view of part E shown in Fig. 8 of further modified example 3.

[0085] 7 and 8 , in the sealed electricity storage devices 10D and 10E of the second modified embodiment, the resin frames 5D and 5E have a body-side resin part 51 coupled to the opening 21 of the metal case body 2, a lid-side resin part 52 coupled to the peripheral edge 41 of the metal lid 4, and separation-facilitating parts 53 and 54 located between the body-side resin part 51 and the lid-side resin part 52 and making it easy to separate the resin frames 5D and 5E into the body-side resin part 51 and the lid-side resin part 52. Here, the separation-facilitating parts 53 and 54 include a member or shape that is easier to melt or cut than the body-side resin part 51 and the lid-side resin part 52.

[0086] For example, in a sealed energy storage device 10D of modified embodiment 2 shown in FIG. 7 , the body-side resin portion 51, the lid-side resin portion 52, and the separation-facilitating portion 53 in the resin frame 5D are formed separately and connected to each other. The separation-facilitating portion 53 is a melt-facilitating portion sandwiched between the body-side resin portion 51 and the lid-side resin portion 52 and formed in a layer shape. Here, the separation-facilitating portion 53 as a melt-facilitating portion includes a portion formed from a resin having a lower melting temperature than the body-side resin portion 51 and the lid-side resin portion 52, or a portion formed from the same resin as the body-side resin portion 51 and the lid-side resin portion 52 but with graphite particles or carbon-based fibers having good thermal conductivity dispersed in the resin base material of the separation-facilitating portion 53. Note that the graphite-based particles can be fine particles such as acetylene black (AB), and the carbon-based fibers can be short-fiber carbon fibers.

[0087] In this case, when the resin frame 5D is heated to disassemble the metal case body 2 and the metal lid 4, only the easily meltable separation-facilitating portion 53 can be melted first without melting the body-side resin portion 51 and the lid-side resin portion 52. This allows the metal case body 2 and the metal lid 4 to be disassembled more quickly and easily while maintaining their original shapes. Furthermore, since the disassembled metal case body 2 and metal lid 4 maintain their original shapes, they can be easily reused.

[0088] 8, for example, in a sealed electricity storage device 10E according to Modification 1 of Modification 2, the body-side resin part 51 and the lid-side resin part 52 in the resin frame 5E are integrally formed, and the separation-facilitating part 54 is formed as a notch shape 54 formed in a groove shape on the outer peripheral surface of an intermediate part between the integrally formed body-side resin part 51 and the lid-side resin part 52. Here, the notch shape 54 is formed as one groove having an arc-shaped cross section, but this is not limited thereto, and the groove may have a V-shaped cross section or a U-shaped cross section, or a plurality of such grooves may be formed.

[0089] In this case, when cutting the resin frame 5E to separate the metal case body 2 and the metal lid 4, only the notched separation-facilitating portion 54 can be easily cut, leaving the body-side resin portion 51 and the lid-side resin portion 52. This allows the metal case body 2 and the metal lid 4 to be disassembled more quickly and easily while maintaining their original shapes. In addition, the disassembled metal case body 2 and metal lid 4 can be easily reused.

[0090] Furthermore, the notched separation facilitation portions 54 are more easily heated and melted than the body-side resin portion 51 and the lid-side resin portion 52, so the metal case body 2 and the metal lid 4 can be quickly separated by heating the separation facilitation portions 54. Furthermore, the notched separation facilitation portions 54 are more easily stretched and contracted than the case-side resin portion 51 and the lid-side resin portion 52, so even if the sealed electricity storage device 10E thermally expands due to an electrochemical reaction during use, the easily stretchable separation facilitation portions 54 mainly absorb this thermal expansion, reducing the load on the joint between the metal case body 2 and the body-side resin portion 51 and the joint between the metal lid 4 and the lid-side resin portion 52.

[0091] Furthermore, in a sealed electricity storage device 10F according to Modifications 2 and 3 of Modification 2, as shown in Fig. 9A and Fig. 9B, the outer peripheral surface of the resin frame 5F may have light absorption facilitating portions 54B and 54C that facilitate the absorption of heat rays. Here, the light absorption facilitating portions 54B and 54C include, for example, a fine uneven shape 54B (Modification 2) shown in Fig. 9A or a colored portion 54C (Modification 3) colored black or similar as shown in Fig. 9B. Furthermore, the colored portion 54C may contain, for example, a polyimide (PI) resin or silicon nitride that has a high light absorption rate for CO2 laser light (wavelength: 10.6 µm).

[0092] In this case, to disassemble the metal case body 2 and the metal lid 4, the outer peripheral surface of the resin frame 5F can be quickly melted by irradiating heat rays such as laser light or far-infrared rays onto the light-absorption facilitating portions 54B, 54C from outside the resin frame 5F. Furthermore, heat rays such as laser light or far-infrared rays promote the movement of polymers in the resin frame 5F in a liquid rather than a solid, improving light absorption. Therefore, if the light-absorption facilitating portions 54B, 54C on the outer peripheral surface are melted first by the heat rays, the resin frame 5F can be melted quickly all the way to the interior, allowing the metal case body 2 and the metal lid 4 to be disassembled more quickly.

[0093] <Modification 3 of the sealed electricity storage device> Next, a third modified embodiment of the sealed electricity storage device 10 will be described with reference to Figs. 10 to 12. Fig. 10 shows a partial cross-sectional view taken along line AA of the third modified embodiment of the sealed electricity storage device shown in Fig. 1. Fig. 11 shows a partial cross-sectional view taken along line BB of the third modified embodiment of the sealed electricity storage device shown in Fig. 1. Fig. 12 shows a partial cross-sectional view taken along line CC of the third modified embodiment of the sealed electricity storage device shown in Fig. 1.

[0094] 10 to 12, a sealed electricity storage device 10G of Modified Example 3 is a sealed electricity storage device 10G in which a metal lid body 4 (4B) doubles as a positive external connection terminal 3A, which is an external connection terminal 3, and holds a negative external connection terminal 3B, which is also an external connection terminal 3, via an insulating member 6B. Here, as shown in FIGS. 10 and 12, the positive external connection terminal 3A is formed separately from the metal lid body 4B, and an outer peripheral surface 33 of the positive external connection terminal 3A is directly joined to a terminal holding hole 42B of the metal lid body 4B, but this is not limiting. For example, the positive external connection terminal 3A may be formed integrally with the metal lid body 4B.

[0095] In this case, the metal lid body 4B also serves as the positive electrode external connection terminal 3A, which is the external connection terminal 3, so there is no need to interpose the insulating member 6A shown in Fig. 3 between the metal lid body 4B and the positive electrode external connection terminal 3A. Therefore, not only can the number of parts of the insulating member 6A be reduced, thereby reducing the labor required for processing and assembly, but it also makes it unnecessary to replace the deteriorated insulating member 6A when reusing the sealed electricity storage device 10G.

[0096] In the sealed electricity storage device 10G of the third modified embodiment, the metal lid body 4 (4C) may also serve as the negative external connection terminal 3B which is the external connection terminal 3, and may hold the positive external connection terminal 3A which is also the external connection terminal 3 via an insulating member 6A. Here, the metal lid body 4 is formed by separately forming a metal lid body 4B which holds the positive external connection terminal 3A and a metal lid body 4C which holds the negative external connection terminal 3B, and these are joined together via an inter-lid insulating member 7.

[0097] In this case, the metal lid body 4C also serves as the negative electrode external connection terminal 3B, which is the external connection terminal 3, so there is no need to interpose the insulating member 6B shown in Fig. 3 between the metal lid body 4C and the negative electrode external connection terminal 3B. This not only reduces the number of parts required for the insulating member 6B, thereby reducing the labor required for processing and assembly, but also makes it unnecessary to replace a deteriorated insulating member 6B when reusing the sealed electricity storage device 10G. The negative electrode external connection terminal 3B may be formed separately from the metal lid body 4C, or may be formed integrally with the metal lid body 4C. Furthermore, when the negative electrode external connection terminal 3B is formed integrally with the metal lid body 4C, the metal lid body 4C will be formed from the same metal material (copper or copper alloy) as the negative electrode external connection terminal 3B. However, by interposing an inter-lid insulating member 7 between the two metal lid bodies 4B, 4C, the metal lid body 4B on the positive electrode external terminal 3A side and the metal lid body 4C on the negative electrode external connection terminal 3B side, which are formed from different metal materials (aluminum or aluminum alloy and copper or copper alloy), can be electrically insulated, thereby avoiding problems such as electrolytic corrosion.

[0098] <Method of manufacturing a sealed electricity storage device according to this other embodiment> Next, one aspect of a method for manufacturing a sealed energy storage device according to this other embodiment will be described with reference to FIGS. 13A to 17. FIG. 13A shows a basic type of process flow diagram illustrating a method for manufacturing the sealed energy storage device shown in FIG. 1. FIG. 13B shows a process flow diagram for Modified Example 1 illustrating a method for manufacturing the sealed energy storage device shown in FIG. 1. FIG. 13C shows a process flow diagram for Modified Example 2 illustrating a method for manufacturing the sealed energy storage device shown in FIG. 1. FIG. 13D shows a process flow diagram for Modified Example 3 illustrating a method for manufacturing the sealed energy storage device shown in FIG. 1. FIG. 14 shows a schematic perspective view illustrating an example of a heating device used in the sealing step shown in FIG. 13A. FIG. 15 shows a schematic perspective view illustrating an example of a heating device used in the sealing step (opening joining step) shown in FIG. 13B. FIG. 16 shows a schematic perspective view illustrating an example of a heating device used in the sealing step (periphery joining step) shown in FIG. 13C. FIG. 17 shows a schematic perspective view illustrating an example of a heating device used in the sealing step (frame-to-frame joining step) shown in FIG. 13D.

[0099] 13A to 17 , one aspect of the method for manufacturing a sealed electricity storage device according to this other embodiment is a method for manufacturing a sealed electricity storage device 10 comprising: an electrode assembly 1; a cylindrical metal case body 2 with a bottom having an opening 21 and housing the electrode assembly 1; an external connection terminal 3 electrically connected to the electrode assembly 1; and a metal lid body 4 that holds the electrode assembly 1 via the external connection terminal 3 and the external connection terminal 3 and seals the opening 21 of the metal case body 2, with the opening 21 of the metal case body 2 and a peripheral portion 41 of the metal lid body 4 airtightly joined around the entire periphery via an annular resin frame 5. The method for manufacturing a sealed electricity storage device includes an accommodating step S1 of accommodating the electrode assembly 1 in the metal case body 2 through the opening 21; and a sealing step S2 of airtightly joining the opening 21 of the metal case body 2 and the peripheral portion 41 of the metal lid body 4 via the resin frame 5 to seal the opening 21. Here, the method for manufacturing a sealed electricity storage device 10 according to this embodiment will be described as a representative example.

[0100] This manufacturing method includes the following devices. For example, as shown in FIG. 14, three annular heating devices X (X1, X2, X3) are provided to heat the metal cover 4 that holds the electrode assembly 1 via the external connection terminals 3 (3A, 3B), the annular resin frame 5, and the opening 21 of the metal case body 2, respectively. The annular heating devices X (X1, X2, X3) can be ceramic heaters or the like. A transport device (not shown) is also provided to transport the metal cover 4, the resin frame 5, and the metal case body 2 to a heating position spaced apart from each other and a joining position where they are in contact with each other. The heating devices X (X1, X2, X3) are not limited to the annular heating devices described above, and various types of heating devices can be used. For example, a heating furnace that heats the metal cover 4, the resin frame 5, and the metal case body 2 together, or a laser device that irradiates only the joint between the metal cover 4, the resin frame 5, and the metal case body 2, may be used.

[0101] Heating device X1 heats the lower end surface of peripheral portion 41 of metal lid 4, which holds electrode body 1 via external connection terminals 3 (3A, 3B), to the melting temperature of resin frame 5. Heating device X2 heats the upper end surface of annular resin frame 5 to its melting temperature. Heating device X3 heats the lower end surface of annular resin frame 5 to its melting temperature, and also heats the upper end surface of opening 21 of metal case main body 2 to the melting temperature of resin frame 5. After heating the heated portion to a predetermined temperature, each heating device X (X1, X2, X3) moves to a standby position.

[0102] Thereafter, the conveying device is operated to convey the metal lid 4, resin frame 5, and metal case body 2 from a heating position where they are spaced apart to a joining position where they come into contact with each other. At this time, the electrode body 1 is accommodated in the metal case body 2 through the opening 21 (accommodating step S1). The opening 21 of the metal case body 2 conveyed to the joining position and the peripheral portion 41 of the metal lid 4 are joined via the resin frame 5, the upper and lower end surfaces of which have been melted, and are airtightly joined by being pressurized and then cooled (sealing step S2).

[0103] Here, in the accommodation step S1, the electrode body 1 is accommodated in the metal case main body 2 with the internal terminals 32 and external terminals 34 of the external connection terminals 3 (3A, 3B) connected, but the electrode body 1 may also be accommodated in advance in the metal case main body 2 with the internal terminals 32 and external terminals 34 separated. In this case, it is necessary to connect the internal terminals 32 and external terminals 34 in the sealing step S2.

[0104] As described above, the manufacturing method for this sealed energy storage device 10 includes an accommodating step S1 of accommodating the electrode body 1 in the metal case body 2 through the opening 21, and a sealing step S2 of airtightly joining the opening 21 of the metal case body 2 and the peripheral portion 41 of the metal lid body 4 via the resin frame 5 to seal the opening 21. Therefore, it is possible to easily manufacture a sealed energy storage device 10 in which the metal case body 2 accommodating the electrode body 1 therein and the metal lid body 4 holding the external connection terminals 3 are airtightly joined by the resin frame 5.

[0105] Furthermore, when dismantling a used sealed electricity storage device 10 for reuse, the metal case body 2 and the metal lid body 4 can be easily separated and dismantled by cutting or melting the resin frame 5 along the circumferential direction at a position spaced apart from the metal case body 2 and the metal lid body 4. Furthermore, when cutting or melting the resin frame 5, the metal case body 2 and the metal lid body 4 are not cut or melted, so metal powder that is harmful to the electrode body 1 is less likely to be generated, making it easy to reuse the electrode body 1. Furthermore, by cutting or melting the resin frame 5, the metal case body 2 and the metal lid body 4 can be maintained in their original state, making it easy to reuse the dismantled metal case body 2 and the metal lid body 4.

[0106] Therefore, according to the manufacturing method for the sealed energy storage device 10 of this other embodiment, it is possible to easily manufacture the sealed energy storage device 10, and it is possible to provide a manufacturing method for a sealed energy storage device in which the metal case body 2 and the lid body 4 can be easily disassembled, metal powder harmful to the electrode body 1 is less likely to be generated during disassembly, and the disassembled case body 2, lid body 4, and electrode body 1 can be easily reused.

[0107] The above-described method for manufacturing the sealed energy storage device 10 can also be applied to the sealed energy storage devices 10B, 10C, 10D, 10E, 10F, and 10G in the respective modified embodiments, and can be modified in various ways without departing from the spirit of the invention. Modifications 1 to 3 are described below.

[0108] (Variation 1) In the manufacturing method of the sealed energy storage device 10 of the first modified example, for example, as shown in FIGS. 13B and 15, the sealing process S2 is an opening joining process S21 in which the lid-side resin frame 5, which has been airtightly joined in advance to the peripheral portion 41 of the metal lid body 4, is directly and airtightly joined to the opening 21 of the metal case body 2.

[0109] 15, this manufacturing method includes two annular heating devices X (X1, X3) that respectively heat the lid-side resin frame 5 that has been airtightly joined to the peripheral edge 41 of the metal lid 4 in advance and the opening 21 of the metal case body 2. Also included is a transport device (not shown) that transports the metal lid 4 and the metal case body 2 to a heating position spaced apart from each other and a joining position where they come into contact with each other. Note that the heating devices X (X1, X3) are not limited to the annular heating devices described above, and various types of heating devices can be used.

[0110] Then, the heating device X1 heats the lower end surface of the lid-side resin frame 5, which is joined to the peripheral portion 41 of the metal lid 4 that holds the electrode body 1 via the external connection terminals 3 (3A, 3B), to its melting temperature. Furthermore, the heating device X3 heats the upper end surface of the opening 21 of the metal case body 2 to the melting temperature of the lid-side resin frame 5. After heating the heated portion to a predetermined temperature, each heating device X (X1, X3) moves to a standby position.

[0111] Thereafter, a conveying device is operated to convey the metal lid body 4 and the metal case body 2, with the lid-side resin frame 5 joined, from a heating position where they are spaced apart to a joining position where they abut against each other. At this time, the electrode body 1 is accommodated in the metal case body 2 through the opening 21 (accommodating step S1). The opening 21 of the metal case body 2 conveyed to the joining position and the peripheral edge 41 of the metal lid body 4 are joined via the lid-side resin frame 5, and are airtightly joined by being pressurized and then cooled (opening joining step S21).

[0112] In this case, the sealing step S2 is an opening joining step S21 in which the lid-side resin frame 5, which has been airtightly joined in advance to the peripheral portion 41 of the metal lid 4, is directly airtightly joined to the opening 21 of the metal case body 2. This allows for a more compact and simplified manufacturing apparatus compared to when the metal lid 4, the resin frame 5, and the metal case body 2 are joined at one time. For example, the lid-side resin frame 5 can be airtightly joined in advance to the peripheral portion 41 of the metal lid 4 by inserting the metal lid 4 into a mold and performing injection molding (insert molding). Therefore, the heating devices (X1, X3) used when joining the lid-side resin frame 5 to the opening 21 of the metal case body 2 in the opening joining step S21 can be significantly smaller than the heating devices (X1, X2, X3) used when joining the metal lid 4, the resin frame 5, and the metal case body 2 at one time.

[0113] (Variation 2) In the manufacturing method of the sealed energy storage device 10 of the modified example 2, for example, as shown in FIGS. 13C and 16, the sealing process S2 is a peripheral joining process S22 in which the body-side resin frame 5, which has been airtightly joined in advance to the opening 21 of the metal case body 2, is directly and airtightly joined to the peripheral portion 41 of the metal lid body 4.

[0114] 16, this manufacturing method includes two annular heating devices X (X1, X3) that respectively heat the peripheral edge 41 of the metal lid 4 and the body-side resin frame 5 that has been previously airtightly joined to the opening 21 of the metal case body 2. Also included is a transport device (not shown) that transports the metal lid 4 and the metal case body 2 to a heating position spaced apart from each other and a joining position where they come into contact with each other. Note that the heating devices X (X1, X3) are not limited to the annular heating devices described above, and various types of heating devices can be used.

[0115] Then, the heating device X1 heats the lower end surface of the peripheral portion 41 of the metal lid body 4, which holds the electrode body 1 via the external connection terminals 3 (3A, 3B), to the melting temperature of the main body side resin frame 5. In addition, the heating device X3 heats the upper end surface of the main body side resin frame 5, which is joined to the opening 21 of the metal case body 2, to the melting temperature. After heating the heated portion to a predetermined temperature, each heating device X (X1, X3) moves to a standby position.

[0116] Thereafter, the conveying device is operated to convey the metal case body 2, with the metal cover 4 and the body-side resin frame 5 joined together, from a heating position where they are spaced apart to a joining position where they abut against each other. At this time, the electrode body 1 is accommodated in the metal case body 2 through the opening 21 (accommodating step S1). The opening 21 of the metal case body 2 conveyed to the joining position and the peripheral edge 41 of the metal cover 4 are joined via the body-side resin frame 5, and are airtightly joined by being pressurized and then cooled (peripheral edge joining step S22).

[0117] In this case, the sealing step S2 is a peripheral joining step S22 in which the body-side resin frame 5, which has previously been airtightly joined to the opening 21 of the metal case body 2, is directly airtightly joined to the peripheral edge 41 of the metal lid 4. This allows for a smaller and simpler manufacturing apparatus than when the metal lid 4, resin frame 5, and metal case body 2 are joined at once. For example, the body-side resin frame 5 can be airtightly joined to the opening 21 of the metal case body 2 in advance by inserting the metal case body 2 into a mold and performing injection molding (insert molding). Therefore, the heating devices (X1, X3) used when joining the body-side resin frame 5 to the peripheral edge 41 of the metal lid 4 in the peripheral joining step S22 can be significantly smaller than the heating devices (X1, X2, X3) used when joining the metal lid 4, resin frame 5, and metal case body 2 at once.

[0118] (Variation 3) 13D and 17, in the method for manufacturing the sealed electricity storage device 10 of the third modification, the sealing step S2 is an inter-frame joining step S23 in which a lid-side partial resin frame 5S that has been previously airtightly joined to the peripheral edge 41 of the metal lid 4 is airtightly joined to a body-side partial resin frame 5K that has been previously airtightly joined to the opening 21 of the metal case body 2. The lid-side partial resin frame 5S and the body-side partial resin frame 5K may be any members that form an annular resin frame 5 when joined together, and although the lid-side partial resin frame 5S and the body-side partial resin frame 5K are formed to approximately the same thickness in FIG. 17, they may be formed to different thicknesses.

[0119] 17, this manufacturing method includes two annular heating devices X (X1, X3) that respectively heat a lid-side partial resin frame 5S airtightly joined to the peripheral edge 41 of the metal lid 4 and a body-side partial resin frame 5K airtightly joined in advance to the opening 21 of the metal case body 2. Also, a transport device (not shown) is provided that transports the metal lid 4 and the metal case body 2 to a heating position spaced apart from each other and a joining position where they come into contact with each other. Note that the heating devices X (X1, X3) are not limited to the annular heating devices described above, and various types of heating devices can be used.

[0120] Then, the heating device X1 heats the lower end surface of the lid-side partial resin frame 5S, which is joined to the peripheral portion 41 of the metal lid 4 that holds the electrode body 1 via the external connection terminals 3 (3A, 3B), to its melting temperature. Also, the heating device X3 heats the upper end surface of the body-side partial resin frame 5K, which is joined to the opening 21 of the metal case body 2, to its melting temperature. After heating the heated portion to a predetermined temperature, each heating device X (X1, X3) moves to its standby position.

[0121] Thereafter, a conveying device is operated to convey the metal lid body 4, to which the lid-side partial resin frame 5S is joined, and the metal case body 2, to which the body-side partial resin frame 5K is joined, from a heating position where they are spaced apart to a joining position where they abut against each other. At this time, the electrode body 1 is accommodated in the metal case body 2 through the opening 21 (accommodating step S1). The opening 21 of the metal case body 2 conveyed to the joining position and the peripheral portion 41 of the metal lid body 4 are airtightly joined via the resin frame 5H (see FIG. 19 ) in which the lid-side partial resin frame 5S and the body-side partial resin frame 5K are airtightly joined to each other (frame-to-frame joining step S23).

[0122] In the method for manufacturing the sealed type electricity storage device 10, the sealing step S2 is an inter-frame joining step S23 in which the lid-side partial resin frame 5S, which has been previously airtightly joined to the peripheral portion 41 of the metal lid 4, and the body-side partial resin frame 5K, which has been previously airtightly joined to the opening 21 of the metal case body 2, are airtightly joined together. This allows for a more compact and simplified manufacturing apparatus compared to joining the metal lid 4, the resin frame 5, and the metal case body 2 all at once. Furthermore, the lid-side partial resin frame 5S can be previously airtightly joined to the peripheral portion 41 of the metal lid 4, for example, by inserting the metal lid 4 into a mold and performing injection molding (insert molding). Furthermore, the body-side partial resin frame 5K can be previously airtightly joined to the opening 21 of the metal case body 2, for example, by inserting the metal case body 2 into a mold and performing injection molding (insert molding). Therefore, in the inter-frame joining process S23, it is only necessary to heat and melt the joining surface between the lid side partial resin frame body 5S and the main body side partial resin frame body 5K, and the heating device can be made significantly smaller than the heating device used when joining the metal lid body 4, resin frame body 5, and metal case main body 2 at the same time.

[0123] <Method for disassembling a sealed electricity storage device according to yet another embodiment> Next, one mode of a disassembling method for a sealed electricity storage device according to yet another embodiment will be described with reference to Figs. 18A to 19. Fig. 18A shows a basic type of process flow diagram illustrating the disassembling method for the sealed electricity storage device shown in Fig. 1. Fig. 18B shows a process flow diagram for Modified Example 1 illustrating the disassembling method for the sealed electricity storage device shown in Fig. 1. Fig. 18C shows a process flow diagram for Modified Example 2 illustrating the disassembling method for the sealed electricity storage device shown in Fig. 1. Fig. 19 shows a partial cross-sectional view taken along line AA of the sealed electricity storage device shown in Fig. 1, in a state prior to disassembly by the disassembly method shown in Fig. 18.

[0124] 18A to 19 , one aspect of the method for disassembling a sealed electricity storage device according to this other embodiment is a method for disassembling the above-described sealed electricity storage device 10, and includes a dividing step T1 of dividing a resin frame 5H interposed between the opening 21 of the metal case body 2 and the peripheral edge 41 of the metal lid 4 into a body-side partial resin frame 5K that is joined to the opening 21 of the metal case body 2 and a lid-side partial resin frame 5S that is joined to the peripheral edge 41 of the metal lid 4, and a removal step T2 of removing the electrode assembly 1 housed in the metal case body 2 through the opening 21. Here, the disassembly method for the sealed electricity storage device 10 according to this embodiment will be described as a representative example, but the disassembly methods for the above-described sealed electricity storage devices 10B, 10C, 10D, 10E, 10F, and 10G of modified embodiments 1 to 3 are also similar.

[0125] 19, a dividing device Y is provided that divides a lid-side partial resin frame 5S airtightly joined to the peripheral edge 41 of the metal lid 4 and a body-side partial resin frame 5K airtightly joined to the opening 21 of the metal case body 2, for example, along a boundary line (5Q) between the two. A transport device (not shown) is also provided that transports the metal lid 4 and the metal case body 2 from a dividing position to a storage position. The dividing device Y then divides the resin frame 5H along the boundary line (5Q) between the lid-side partial resin frame 5S and the body-side partial resin frame 5K (dividing step T1). After dividing the resin frame 5H, the dividing device Y moves to a standby position.

[0126] Thereafter, the conveying device is operated to convey the metal lid body 4 to which the lid-side partial resin frame 5S is joined and the metal case body 2 to which the body-side partial resin frame 5K is joined from the separation position to the storage position. At this time, the electrode body 1 is removed from the metal case body 2 through the opening 21 (removal step T2). The removed electrode body 1 is separated from the metal lid body 4 and disassembled into a positive electrode sheet and a negative electrode sheet.

[0127] This disassembly method for the sealed energy storage device 10 includes a dividing step T1 in which the resin frame 5H, located between the opening 21 of the metal case body 2 and the peripheral edge 41 of the metal lid 4, is divided into a body-side partial resin frame 5K that is connected to the opening 21 of the metal case body 2 and a lid-side partial resin frame 5S that is connected to the peripheral edge 41 of the metal lid 4. Therefore, the metal case body 2 and the metal lid 4 can be easily separated and disassembled by cutting or melting the resin frame 5H along the circumferential direction at a position spaced apart from the metal case body 2 and the metal lid 4. Furthermore, when the resin frame 5H is cut or melted, the metal case body 2 and the metal lid 4 are not cut or melted, and therefore metal powder that is harmful to the electrode assembly 1 is less likely to be generated. Furthermore, by cutting or melting the resin frame 5H, the metal case body 2 and the metal lid 4 can be maintained in their original state.

[0128] Furthermore, since the method includes a removal step T2 of removing the electrode body 1 housed in the metal case body 2 through the opening 21, the electrode body 1 can be removed from the metal case body 2 while being held by the metal lid body 4 via the external connection terminal 3, and can be easily separated from the metal lid body 4. Therefore, the metal case body 2, the metal lid body 4, and the electrode body 1 can be disassembled in a state that makes them easy to reuse.

[0129] Therefore, according to the disassembly method for a sealed energy storage device 10 of yet another embodiment, it is possible to provide a method for disassembling a sealed energy storage device that allows for easy disassembly of the metal case body 2 and lid body 4, is less likely to generate metal powder that is harmful to the electrode body 1 during disassembly, and makes it easy to reuse the disassembled case body 2, lid body 4, and electrode body 1.

[0130] The above-described method for disassembling the sealed energy storage device 10 can also be applied to the sealed energy storage devices 10B, 10C, 10D, 10E, 10F, and 10G of the respective modified embodiments, and can be modified in various ways without departing from the spirit of the invention. Modifications 1 and 2 are described below.

[0131] (Variation 1) In the disassembly method for the sealed energy storage device 10 of the first modified example, for example, as shown in FIGS. 18B and 19, the dividing step T1 is a melting and dividing step T11 in which a separation portion 5Q (an example of a melting and dividing portion) of the resin frame 5H that is separated from the metal case main body 2 and the metal lid body 4 is melted while the metal lid body 4 and the metal case main body 2 are moved relative to each other in the separating direction, thereby dividing the resin frame 5H into a main body side partial resin frame 5K and a lid side partial resin frame 5S.

[0132] 19, this disassembly method includes a heat melting device Y1 that melts a lid-side partial resin frame 5S airtightly joined to the peripheral edge 41 of the metal lid 4 and a body-side partial resin frame 5K airtightly joined to the opening 21 of the metal case body 2, for example, along the boundary line (separation portion 5Q) between them. The heat melting device Y1 can be, for example, a device that applies a heated thin plate-like hot blade or laser light to the outer peripheral surface of the resin frame 5H to melt them along the boundary line (separation portion 5Q). The disassembly method also includes a transport device (not shown) that vertically separates the metal lid 4 and the metal case body 2 from the separation position and transports them to a storage position.

[0133] Then, while the heating and melting device Y1 melts the resin frame 5H, for example, along the boundary line (separation portion 5Q), the conveying device operates to vertically separate the metal lid body 4 to which the lid-side partial resin frame 5S is joined and the metal case body 2 to which the body-side partial resin frame 5K is joined (melting and dividing step T11). At this time, the electrode body 1 is removed from the metal case body 2 through the opening 21 (removal step T2). The removed electrode body 1 is separated from the metal lid body 4 and disassembled into a positive electrode sheet and a negative electrode sheet.

[0134] In this case, the dividing step T1 is a melting and dividing step T11 in which the resin frame 5H is divided into the body-side partial resin frame 5K and the lid-side partial resin frame 5S by melting the separation portion 5Q of the resin frame 5H separated from the metal case body 2 and the metal lid 4 and moving the metal lid 4 and the metal case body 2 relative to each other in the separating direction. Therefore, the resin frame 5H can be easily disassembled into the metal case body 2 to which the body-side partial resin frame 5K is joined and the metal lid 4 to which the lid-side partial resin frame 5S is joined. Furthermore, since the metal case body 2 and the metal lid 4 are not melted or cut when the resin frame 5H is melted, metal powder harmful to the electrode assembly 1 is unlikely to be generated. Furthermore, by dividing the resin frame 5H while melting it, the metal case body 2 and the metal lid 4 can be maintained in their original state. The heat-melting device Y1 is not limited to the above-described device, and various types of heat-melting devices can be used.

[0135] (Variation 2) In the disassembly method for the sealed energy storage device 10 of the second modified example, for example, as shown in FIGS. 18C and 19, the dividing step T1 is a cutting and dividing step T12 in which a separation portion 5Q (an example of a cutting and dividing portion) of the resin frame body 5H that is separated from the metal case main body 2 and the metal lid body 4 is cut around the entire circumference to divide the resin frame body 5H into a main body side partial resin frame body 5K and a lid side partial resin frame body 5S.

[0136] 19, this disassembly method includes a cutting device Y2 that cuts a lid-side partial resin frame 5S airtightly joined to the peripheral edge 41 of the metal lid 4 and a body-side partial resin frame 5K airtightly joined to the opening 21 of the metal case body 2, for example, along a boundary line (separation portion 5Q) between the two. The cutting device Y2 can be, for example, a device that cuts along the boundary line 5Q by cutting with a saw-like cutting blade or a drill-like end mill. Also, a transport device (not shown) is included that separates the metal lid 4 and the metal case body 2 vertically from the separation position and transports them to a storage position.

[0137] Then, after the cutting device Y2 cuts the resin frame 5, for example, along the boundary line (separation portion 5Q) (cutting and dividing step T12), the conveying device operates to vertically separate the metal lid body 4 to which the lid-side partial resin frame 5S is joined and the metal case body 2 to which the body-side partial resin frame 5K is joined. At this time, the electrode body 1 is removed from the metal case body 2 through the opening 21 (removal step T2). The removed electrode body 1 is separated from the metal lid body 4 and disassembled into a positive electrode sheet and a negative electrode sheet.

[0138] In this case, the dividing step T1 is a cutting and dividing step T12 in which the separation portion 5Q of the resin frame 5H, which is separated from the metal case body 2 and the metal lid 4, is cut along the entire circumference to divide the resin frame 5H into the body-side partial resin frame 5K and the lid-side partial resin frame 5S. Therefore, the metal case body 2 to which the body-side partial resin frame 5K is joined can be easily disassembled into the metal lid 4 to which the lid-side partial resin frame 5S is joined. Furthermore, since the metal case body 2 and the metal lid 4 are not cut when the resin frame 5H is cut, metal powder that is harmful to the electrode assembly 1 is unlikely to be generated. Furthermore, by cutting the resin frame 5H, the metal case body 2 and the metal lid 4 can be maintained in their original state. The cutting device Y2 is not limited to the above-described device, and various types of cutting devices can be used.

[0139] <Sealed Case Reuse Electricity Storage Device According to Yet Another Embodiment> Next, one aspect of a case-reused sealed energy storage device according to yet another embodiment will be described with reference to FIGS. 1, 2, 19, and 20. FIG. 1 shows a perspective view of one aspect of a sealed energy storage device according to this embodiment and one aspect of a case-reused sealed energy storage device according to another embodiment. FIG. 2 shows an exploded perspective view of the sealed energy storage device and the case-reused sealed energy storage device shown in FIG. 1. FIG. 19 shows a partial cross-sectional view taken along line AA of the sealed energy storage device shown in FIG. 1, in a state before disassembly by the disassembly method shown in FIG. 18. FIG. 20 shows a partial cross-sectional view taken along line AA of the case-reused sealed energy storage device shown in FIG. 1.

[0140] 1, 2, 19, and 20, one aspect of a sealed case reuse electricity storage device 10H according to this other embodiment includes an electrode body 1, a bottomed cylindrical metal case body 2 having an opening 21 and accommodating the electrode body 1, a resin-framed metal case body 2J to which a body-side partial resin frame 5KJ is joined along the entire periphery of the opening 21, an external connection terminal 3 electrically connected to the electrode body 1, and a metal lid body 4 holding the electrode body 1 via the external connection terminal 3, and a lid-side partial resin frame 5SJ joined along the entire periphery of a peripheral portion 41 of the resin-framed metal case body 2J. and a resin-framed metal lid body 4J that seals the opening 21J, and the opening 21 of the metal case body 2 and the peripheral edge 41 of the metal lid body 4 are airtightly joined all around via a composite resin frame 5HJ that joins an annular body-side partial resin frame 5KJ and a lid-side partial resin frame 5SJ, and the case-reused sealed electricity storage device 10H is at least one of the resin-framed metal case body 2J being a recycled resin-framed metal case body 2JS and the resin-framed metal lid body 4J being a recycled resin-framed metal lid body 4JS.

[0141] Here, examples of the above-mentioned "metal case body 2JS with recycled resin frame" and "metal lid body 4JS with recycled resin frame" include those obtained by dividing a resin frame 5H of a manufactured sealed energy storage device 10, which includes a metal case body 2 and a metal lid body 4, in which an opening 21 of the metal case body 2 and a peripheral portion 41 of the metal lid body 4 are airtightly joined around the entire periphery via an annular resin frame 5, into a body-side partial resin frame 5K that is joined to the opening 21 of the metal case body 2 and a lid-side partial resin frame 5S that is joined to the peripheral portion 41 of the metal lid body 4. Further examples include those obtained by dividing a composite resin frame 5HJ of the above-mentioned manufactured case-reused sealed energy storage device 10H into a body-side partial resin frame 5KJ that is joined to the opening 21 of the metal case body 2 and a lid-side partial resin frame 5SJ that is joined to the peripheral portion 41 of the metal lid body 4.

[0142] The sealed electricity storage device 10 can also be replaced with the sealed electricity storage devices 10B, 10C, 10D, 10E, 10F, and 10G of the above-described respective modified embodiments. In addition, detailed descriptions of the sealed electricity storage device 10 and the respective modified embodiments of the sealed electricity storage devices 10B, 10C, 10D, 10E, 10F, and 10G will be omitted in principle to avoid redundancy, and the following description will focus mainly on matters specific to the recycled sealed electricity storage device 10H.

[0143] This case-reusable sealed energy storage device 10H comprises a resin-framed metal case body 2J to which a body-side partial resin frame body 5KJ is bonded around the entire circumference of an opening 21, an external connection terminal 3 electrically connected to the electrode body 1, and a metal lid body 4 that holds the external connection terminal 3 and the electrode body 1 via the external connection terminal 3, and a resin-framed metal lid body 4J that seals an opening 21J of the resin-framed metal case body 2J to which a lid-side partial resin frame body 5SJ is bonded around the entire circumference of a peripheral portion 41.

[0144] Furthermore, since the metal case body 2J with resin frame is at least one of a metal case body 2JS with a recycled resin frame and a metal lid body 4J with a resin frame being a metal lid body 4JS with a recycled resin frame, it is possible to effectively utilize the metal case body 2JS with a recycled resin frame and / or the metal lid body 4JS with a recycled resin frame obtained by dividing the resin frame body 5H of a manufactured sealed energy storage device 10 or the composite resin frame body 5HJ of a manufactured case-recycled sealed energy storage device 10H.

[0145] Furthermore, in this case-reusable sealed electricity storage device 10H, the opening 21 of the metal case body 2 and the peripheral edge 41 of the metal lid body 4 are hermetically joined around the entire periphery via a composite resin frame 5HJ that joins an annular body-side partial resin frame 5KJ and a lid-side partial resin frame 5SJ. Therefore, when disassembling the metal case body 2 and the metal lid body 4 again, the metal case body 2 and the metal lid body 4 can be easily separated and dismantled again by, for example, cutting or melting the composite resin frame 5HJ along the circumferential direction at or near the boundary line between the annular body-side partial resin frame 5KJ and the lid-side partial resin frame 5SJ (separation portion 5QJ). Furthermore, when cutting or melting the composite resin frame 5HJ, the metal case body 2 and the metal lid body 4 are not cut or melted, so metal powder harmful to the electrode body 1 is less likely to be generated, making the electrode body 1 easier to reuse. Furthermore, even if the composite resin frame 5HJ is cut or melted, the metal case body 2 and the metal lid 4 can be maintained in their original state, so that the disassembled metal case body 2 and the metal lid 4 can be easily reused.

[0146] Therefore, according to yet another embodiment of the case-reused sealed energy storage device 10H, the metal case body 2 and lid body 4 can be easily disassembled, and metal powder that is harmful to the electrode body 1 is less likely to be generated during disassembly, making it possible to provide a case-reused sealed energy storage device 10H in which the disassembled case body 2, lid body 4, and electrode body 1 can be easily reused.

[0147] <Method of manufacturing a sealed case-reusable electricity storage device according to yet another embodiment> Next, one aspect of a method for manufacturing a case-reused sealed electricity storage device according to yet another embodiment will be described with reference to FIGS. 20 to 22. FIG. 20 shows the sealed electricity storage device shown in FIG. 1 and a partial cross-sectional view taken along line AA of the case-reused sealed electricity storage device. FIG. 21A shows a basic type process flow diagram illustrating a method for manufacturing the case-reused sealed electricity storage device shown in FIG. 1. FIG. 21B shows a process flow diagram of Modified Example 1 illustrating a method for manufacturing the case-reused sealed electricity storage device shown in FIG. 1. FIG. 21C shows a process flow diagram of Modified Example 2 illustrating a method for manufacturing the case-reused sealed electricity storage device shown in FIG. 1. FIG. 22 shows a schematic perspective view illustrating an example of a heating apparatus used in the sealing step shown in FIGS. 21A, 21B, and 21C.

[0148] One aspect of the manufacturing method for the present case-reused sealed electricity storage device 10H is a manufacturing method for the above-mentioned case-reused sealed electricity storage device 10H, as shown in Figures 20, 21A, and 22, and is a manufacturing method for the case-reused sealed electricity storage device 10H including an accommodating step S1S of accommodating the electrode body 1 in the metal case main body 2 through the opening 21, and a sealing step S2S of airtightly bonding the main body side partial resin frame 5KJ and the lid side partial resin frame 5SJ to form a composite resin frame 5HJ and airtightly sealing the opening 21.

[0149] 22, this manufacturing method includes two annular heating devices X (X1, X3) that respectively heat a lid-side partial resin frame 5SJ airtightly joined to the peripheral edge 41 of the metal lid 4 and a body-side partial resin frame 5KJ airtightly joined to the opening 21 of the metal case body 2. Also included is a transport device (not shown) that transports the metal lid 4 and the metal case body 2 to a heating position spaced apart from each other and a joining position where they come into contact with each other. Note that the heating devices X (X1, X3) are not limited to the annular heating devices described above, and various types of heating devices can be used.

[0150] Then, the heating device X1 heats the lower end surface of the lid-side partial resin frame 5SJ, which is joined to the peripheral portion 41 of the metal lid 4 that holds the electrode body 1 via the external connection terminals 3 (3A, 3B), to its melting temperature. Also, the heating device X3 heats the upper end surface of the body-side partial resin frame 5KJ, which is joined to the opening 21 of the metal case body 2, to its melting temperature. After heating the heated portion to a predetermined temperature, each heating device X (X1, X3) moves to its standby position.

[0151] Thereafter, a conveying device is operated to convey the resin-framed metal lid body 4J, to which the lid-side partial resin frame 5SJ is joined, and the resin-framed metal case body 2J, to which the body-side partial resin frame 5KJ is joined, from a heating position where they are spaced apart to a joining position where they abut against each other. At this time, the electrode body 1 is accommodated in the resin-framed metal case body 2J through the opening 21 (accommodating step S1S). The opening 21 of the resin-framed metal case body 2J conveyed to the joining position and the peripheral portion 41 of the resin-framed metal lid body 4J are airtightly joined via the composite resin frame 5HJ, in which the lid-side partial resin frame 5SJ and the body-side partial resin frame 5KJ are airtightly joined to each other (sealing step S2S).

[0152] The manufacturing method for this case-reused sealed energy storage device 10H includes an accommodation step S1S of accommodating the electrode body 1 in the metal case main body 2 through the opening 21, and a sealing step S2S of airtightly joining the main body side partial resin frame 5KJ and the lid side partial resin frame 5SJ to form a composite resin frame 5HJ and airtightly seal the opening 21.Therefore, it is possible to easily manufacture the case-reused sealed energy storage device 10H in which the metal case main body 2 accommodating the electrode body 1 therein and the metal lid body 4 holding the external connection terminals 3 are airtightly joined by the composite resin frame 5HJ.

[0153] Furthermore, when disassembling the case-reusable sealed electricity storage device 10H again, the metal case body 2 and the metal lid body 4 can be easily separated and disassembled by cutting, melting, or the like the composite resin frame 5HJ circumferentially at or near the boundary line (separation portion 5QJ) between the body-side partial resin frame 5KJ and the lid-side partial resin frame 5SJ. Furthermore, since the metal case body 2 and the metal lid body 4 are not cut or melted when the composite resin frame 5HJ is cut or melted, metal powder harmful to the electrode body 1 is less likely to be generated, making it easy to reuse the electrode body 1. Furthermore, since the metal case body 2 and the metal lid body 4 can be maintained in their original state by cutting or melting the composite resin frame 5HJ, the disassembled metal case body 2 and the metal lid body 4 can be easily reused.

[0154] Here, in the accommodation step S1S, the electrode body 1 is accommodated in the metal case main body 2 with the internal terminals 32 and external terminals 34, which are external connection terminals 3, connected, but the electrode body 1 may also be accommodated in advance in the metal case main body 2 with the internal terminals 32 and external terminals 34 separated. In this case, it is necessary to connect the internal terminals 32 and external terminals 34 in the sealing step S2S.

[0155] Therefore, according to the manufacturing method of the case-reused sealed energy storage device 10H of yet another embodiment, it is possible to easily manufacture the case-reused sealed energy storage device 10H, and it is possible to provide a manufacturing method of the case-reused sealed energy storage device 10H in which the case body 2 and the lid body 4, which are made of metal, can be easily disassembled, metal powder that is harmful to the electrode body 1 is less likely to be generated during disassembly, and the disassembled case body 2, lid body 4, and electrode body 1 can be easily reused.

[0156] The manufacturing method of the present case-reusable sealed electricity storage device 10H described above can also be applied to the sealed electricity storage devices 10B, 10C, 10D, 10E, 10F, and 10G of the above-mentioned variations, and can be modified in various ways without departing from the spirit of the invention. Modifications 1 and 2 are described below.

[0157] (Variation 1) In the manufacturing method of the case-reused sealed electricity storage device 10H of the first modification, for example, as shown in Figures 20 and 21B, the metal case body 2J with a resin frame is a metal case body 2JS with a recycled resin frame, and the manufacturing method of the case-reused sealed electricity storage device 10H may include a body-side partial resin frame shaping process S11S in which, prior to the accommodation process S1S, the body-side partial resin frame 5KJ joined to the opening 21 of the metal case body 2 is shaped into a predetermined shape.

[0158] Here, methods for shaping the main body side partial resin frame body 5KJ into a predetermined shape include a method of shaping the uneven shape on the joining surface (top surface) of the main body side partial resin frame body 5KJ before it is joined with the lid side partial resin frame body 5SJ into a regular shape by cutting, grinding, melting, etc., and a method of shaping the uneven shape into a regular shape by filling the uneven shape with another resin.

[0159] In the manufacturing method of Modification 1, the resin-framed metal case body 2J is a recycled resin-framed metal case body 2JS, and prior to the accommodating step S1S, a body-side partial resin frame shaping step S11S is provided in which the body-side partial resin frame 5KJ coupled to the opening 21 of the metal case body 2 is shaped into a predetermined shape. Therefore, in order to reuse the sealed energy storage device 10 or the case-reusable sealed energy storage device 10H, when the resin frame 5H or the composite resin frame 5HJ is cut or melted along the circumferential direction at a position spaced apart from the metal case body 2 and the metal lid 4, the uneven shape generated in the body-side partial resin frame 5KJ can be shaped into a regular shape. Therefore, in the sealing step S2S, the opening 21 can be sealed more airtightly by the composite resin frame 5HJ formed by combining the body-side partial resin frame 5KJ shaped into the regular shape with the lid-side partial resin frame 5SJ.

[0160] (Variation 2) In the manufacturing method of the case-reused sealed electricity storage device 10H of the second modification, for example, as shown in Figures 20 and 21C, the resin-framed metal lid body 4J may be a recycled resin-framed metal lid body 4JS, and the manufacturing method of the case-reused sealed electricity storage device 10H may include a lid-side partial resin frame shaping process S12S in which, prior to the accommodation process S1S, the lid-side partial resin frame body 5SJ joined to the peripheral portion 41 of the metal lid body 4 is shaped into a predetermined shape.

[0161] Here, methods for shaping the lid side partial resin frame body 5SJ into a predetermined shape include a method of shaping the uneven shape on the joining surface (bottom surface) of the lid side partial resin frame body 5SJ before it is joined with the main body side partial resin frame body 5KJ into a regular shape by cutting, grinding, melting, etc., and a method of shaping the uneven shape into a regular shape by filling the uneven shape with resin.

[0162] In the manufacturing method of Modification 2, the resin-framed metal lid 4J is a recycled resin-framed metal lid 4JS, and includes a lid-side partial resin frame shaping step S12S of shaping the lid-side partial resin frame 5SJ joined to the peripheral edge 41 of the metal lid 4 into a predetermined shape prior to the accommodating step S1S. Therefore, in order to reuse the sealed energy storage device 10 or the case-reusable sealed energy storage device 10H, when the resin frame 5H or the composite resin frame 5HJ is cut or melted along the circumferential direction at a position spaced apart from the metal case body 2 and the metal lid 4, the uneven shape that occurs in the lid-side partial resin frame 5SJ can be shaped into a regular shape. Therefore, in the sealing step S2S, the opening 21 can be sealed more airtightly by the composite resin frame 5HJ formed by joining the lid-side partial resin frame 5SJ shaped into the regular shape and the body-side partial resin frame 5KJ. [Explanation of symbols]

[0163] 1 Electrode body 2 Metal case body 2J Metal case body with resin frame 2JS Recycled metal case with resin frame 3 External connection terminal 3A positive external connection terminal 3B Negative external connection terminal 4, 4B, 4C Metal lid body 4J Metal lid with resin frame 4JS Recycled resin frame with metal lid 5, 5B, 5C, 5D, 5E, 5F, 5H Resin frame, lid side resin frame, main body side resin frame 5HJ composite resin frame 5Q separation section (melting separation section, cutting separation section) 5S, 5SJ Lid side partial resin frame 5K, 5KJ Main body side resin frame 6, 6A, 6B Insulating material 10, 10B, 10C, 10D, 10E, 10F, 10G Sealed energy storage device 10H Case Reusable Sealed Energy Storage Device 21, 21J opening 21K, 33K, 41K, 42K Bonding strength strengthening treatment surface 33 Outer surface 41 Periphery 42 Terminal holding hole 51 Body side resin part 52 Lid side resin part 53, 54 Separation facilitation part 54B, 54C Light absorption facilitating section S1, S1S Storage process S2, S2S sealing process S21 Opening joining process S22 Edge joining process S23 Frame joining process S11S Body side partial resin frame shaping process S12S Lid side partial resin frame shaping process T1 splitting process T11 Melt division process T12 Cutting and dividing process T2 extraction process

Claims

1. An electrode body; a cylindrical metal case body having an opening and accommodating the electrode assembly; an external connection terminal electrically connected to the electrode body; a metal lid that holds the external connection terminal and the electrode body via the external connection terminal and seals an opening of the metal case body, the opening of the metal case body and the peripheral edge of the metal lid are airtightly joined around the entire periphery via an annular resin frame; The resin frame is a main body side resin portion coupled to the opening of the metal case main body; a lid-side resin portion coupled to a peripheral edge portion of the metal lid body; a separation-facilitating portion that is located between the body-side resin portion and the lid-side resin portion and that makes it easy to separate the resin frame into the body-side resin portion and the lid-side resin portion, The body-side resin portion, the lid-side resin portion, and the separation-facilitating portion are formed separately from each other and are connected to each other. Sealed energy storage device.

2. The sealed electricity storage device according to claim 1, The resin frame is formed of a thermoplastic resin having a heat-resistant temperature of 200° C. or higher and a melting temperature lower than the melting temperatures of the metal case body and the metal lid. Sealed energy storage device.

3. The sealed electricity storage device according to claim 1, the opening of the metal case body has a treated surface on the body side that strengthens the bonding strength with the resin around the entire periphery, The resin frame is airtightly attached to the treated surface of the main body over the entire periphery. Sealed energy storage device.

4. The sealed electricity storage device according to claim 1, The peripheral portion of the metal lid has a lid-side treated surface over the entire periphery that strengthens the bonding strength with the resin, The resin frame is airtightly attached to the treated surface of the lid over the entire periphery. Sealed energy storage device.

5. The sealed electricity storage device according to claim 1, The outer peripheral surface of the resin frame has a light absorption facilitating portion that facilitates the absorption of heat rays. Sealed energy storage device.

6. The sealed electricity storage device according to claim 1, The metal lid body holds the external connection terminals, ie, a positive electrode external connection terminal and a negative electrode external connection terminal, via insulating members. Sealed energy storage device.

7. The sealed electricity storage device according to claim 1, The metal lid body also serves as the positive electrode external connection terminal, which is the external connection terminal, and holds the negative electrode external connection terminal, which is the external connection terminal, via an insulating member. Sealed energy storage device.

8. The sealed electricity storage device according to claim 1, The metal lid body also serves as the negative electrode external connection terminal, which is the external connection terminal, and holds the positive electrode external connection terminal, which is the external connection terminal, via an insulating member. Sealed energy storage device.

9. The sealed electricity storage device according to any one of claims 6 to 8, The terminal holding hole of the metal cover, which holds the external connection terminal via the insulating member, and the outer peripheral surface of the external connection terminal that abuts against the insulating member each have a bonding strength strengthening treatment surface over the entire periphery that strengthens the bonding strength with the insulating member. Sealed energy storage device.

10. An electrode body; a cylindrical metal case body having an opening and accommodating the electrode assembly; an external connection terminal electrically connected to the electrode body; a metal lid that holds the external connection terminal and the electrode body via the external connection terminal and seals an opening of the metal case body, the opening of the metal case body and the peripheral edge of the metal lid are airtightly joined around the entire periphery via an annular resin frame; The resin frame is a main body side resin portion coupled to the opening of the metal case main body; a lid-side resin portion coupled to a peripheral edge portion of the metal lid body; a separation-facilitating portion that is located between the body-side resin portion and the lid-side resin portion and that makes it easy to separate the resin frame into the body-side resin portion and the lid-side resin portion, The body-side resin portion, the lid-side resin portion, and the separation-facilitating portion are formed separately from each other and are connected to each other. A method for manufacturing a sealed electricity storage device, comprising: an accommodating step of accommodating the electrode body in the metal case main body through the opening; a sealing step of airtightly joining the opening of the metal case body and the peripheral edge of the metal lid body via the resin frame to seal the opening. A method for manufacturing a sealed electricity storage device.

11. A method for manufacturing the sealed type electricity storage device according to claim 10, The sealing step includes: an opening joining step in which the lid-side resin frame, which has been previously airtightly joined to the peripheral edge of the metal lid, is directly and airtightly joined to the opening of the metal case body; A method for manufacturing a sealed electricity storage device.

12. A method for manufacturing the sealed type electricity storage device according to claim 11, The sealing step includes: a peripheral joining step in which the main body side resin frame, which has been previously airtightly joined to the opening of the metal case main body, is directly and airtightly joined to the peripheral edge of the metal lid; A method for manufacturing a sealed electricity storage device.

13. A method for manufacturing the sealed type electricity storage device according to claim 11, The sealing step includes: a lid-side resin frame body that is airtightly joined to the peripheral edge of the metal lid body in advance; a frame-to-frame joining step for airtightly joining the main body side partial resin frame, which has been airtightly joined to the opening of the metal case main body in advance; A method for manufacturing a sealed electricity storage device.

14. A method for disassembling the sealed electricity storage device according to claim 1, comprising: the resin frame interposed between the opening of the metal case body and the peripheral edge of the metal lid, a main body side partial resin frame body that is connected to the opening of the metal case main body; The resin frame is connected to the peripheral edge of the metal lid. A division step; and a removal step of removing the electrode body housed in the metal case body through the opening. A method for disassembling a sealed electricity storage device.

15. A method for disassembling the sealed electricity storage device according to claim 14, comprising: The dividing step comprises: a melting and dividing step of melting and dividing the resin frame into the body-side partial resin frame and the lid-side partial resin frame by relatively moving the metal lid and the metal case body in a separating direction while melting a melt-separated portion of the resin frame that is separated from the metal case body and the metal lid. A method for disassembling a sealed electricity storage device.

16. A method for disassembling the sealed electricity storage device according to claim 14, comprising: The dividing step comprises: a cutting and dividing step of cutting the resin frame along the entire periphery of a cutting and separating portion that is separated from the metal case body and the metal lid body to divide the resin frame into the body-side partial resin frame and the lid-side partial resin frame. A method for disassembling a sealed electricity storage device.

17. An electrode body; a metal case body having a bottom and a cylindrical shape, the metal case body having an opening and accommodating the electrode body, the metal case body having a resin frame and a main body side partial resin frame joined to the metal case body around the entire periphery of the opening; an external connection terminal electrically connected to the electrode body; a metal lid body with a resin frame that seals an opening of the metal case body with a resin frame, the metal lid body being the external connection terminal and holding the electrode body via the external connection terminal, and having a lid-side partial resin frame joined around the entire periphery of the periphery; The opening of the metal case body and the peripheral edge of the metal lid are airtightly joined around the entire periphery via a composite resin frame that joins the annular body-side partial resin frame and the lid-side partial resin frame at a separation portion located at a position spaced from the opening of the metal case body and the peripheral edge of the metal lid. A case-reused sealed energy storage device, comprising: The resin-framed metal case body is a recycled resin-framed metal case body. and, The resin-framed metal lid body is a recycled resin-framed metal lid body. At least one of Case reuse sealed energy storage device.

18. A method for manufacturing the case-reused sealed electricity storage device according to claim 17, comprising: an accommodating step of accommodating the electrode assembly in the metal case main body through the opening; a sealing step of airtightly joining the main body side partial resin frame and the lid side partial resin frame to form the composite resin frame and airtightly sealing the opening. A method for manufacturing a case-reused sealed energy storage device.

19. The method for manufacturing a case-reused sealed electricity storage device according to claim 18, the resin-framed metal case body is a recycled resin-framed metal case body, Prior to the containing step, a main body side partial resin frame shaping step for shaping the main body side partial resin frame joined to the opening of the metal case main body into a predetermined shape; A method for manufacturing a case-reused sealed energy storage device.

20. 20. The method for manufacturing a case-reusable sealed electricity storage device according to claim 18 or 19, the resin-framed metal lid body is the recycled resin-framed metal lid body, Prior to the containing step, a lid-side partial resin frame shaping step for shaping the lid-side partial resin frame joined to the peripheral edge of the metal lid body into a predetermined shape; A method for manufacturing a case-reused sealed energy storage device.

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