JP2021125406A - Structure for nonaqueous electrolyte secondary battery, manufacturing apparatus for nonaqueous electrolyte secondary battery and manufacturing method for nonaqueous electrolyte secondary battery - Google Patents

Abstract

To provide: a structure for a nonaqueous electrolyte secondary battery, aiming for achieving a nonaqueous electrolyte secondary battery that ensures transportation safety while suppressing the deterioration of battery performance in battery manufacturing; a manufacturing apparatus for a nonaqueous electrolyte secondary battery; and a manufacturing method for a nonaqueous electrolyte secondary battery.SOLUTION: A structure for a nonaqueous electrolyte secondary battery includes: an electrode assembly 20; an exterior member 50 housing the electrode assembly 20 therein; an external electrode terminal penetrating through the exterior member 50 from inside to outside, the external electrode terminal being connected to the electrode assembly 20; and at least one opening 61 provided in the exterior member 50 to communicate the inside and outside of the exterior member 50. The structure for a nonaqueous electrolyte secondary battery also has a cylindrical member 62 attached directly to the opening 61 or attached to surround the opening 61. The cylindrical member 62 has a male or female joint structure at least in a part thereof. The opening 61 is sealed by a sealing part. The electrode assembly 20 is tightly sealed by the exterior member 50 and the sealing part of the opening 61. There is no electrolyte in the exterior member 50.SELECTED DRAWING: Figure 1

Description

The present invention is a structure for a non-aqueous electrolyte secondary battery used in a non-aqueous electrolyte secondary battery using a non-aqueous electrolyte as an electrolyte, and a manufacturing apparatus for a non-aqueous electrolyte secondary battery for producing a non-aqueous electrolyte secondary battery. And a method for manufacturing a non-aqueous electrolyte secondary battery using a structure for a non-aqueous electrolyte secondary battery.

As the non-aqueous electrolyte secondary battery, for example, a lithium ion secondary battery using a lithium metal oxide as an electrode active material and an electrolytic solution such as an organic solvent as a non-aqueous electrolyte is widely used. The lithium ion secondary battery includes an electrode joint having an electrode active material layer, an exterior member that houses the electrode joint inside, and an external electrode terminal that is connected to the electrode joint and is led out from the inside of the exterior member to the outside. And a non-aqueous electrolyte such as an electrolytic solution housed in the exterior member. Such lithium-ion secondary batteries include a case-accommodating battery in which an electrode joint is housed in a cylindrical battery case or a square pillar-shaped square battery case as an exterior member, and an electrode made of a laminated film as an exterior member. A pouch-type battery that surrounds and seals a joint is known. Each battery is used as a unit cell (battery cell) of a secondary battery, or as a battery module packaged by connecting a plurality of batteries in series.

Further, the electrode active material layer and the non-aqueous electrolyte used in the lithium ion secondary battery have a problem that the desired battery performance cannot be obtained by taking in water. For example, if the electrode contains water when the electrode joint is housed in the exterior member and sealed, the water is contained in the electrolyte, and the battery expands when it is charged and discharged as a battery. It will impair the function as. For this reason, in the process of manufacturing a lithium ion secondary battery, particularly in the process of injecting liquid and sealing, care should be taken not to bring water into the exterior member together with the member housed in the external member such as the electrode joint. , It is necessary to be careful not to take in moisture from the outside of the exterior member.

For this reason, the case-contained battery is shipped in a sealed state in which the electrode joint and the electrolyte are housed in the outer case.

Further, in the pouch type battery, the electrode joint and the electrolyte are sealed in a container formed of a laminated film and shipped.

Japanese Unexamined Patent Publication No. 2012-69268 Japanese Unexamined Patent Publication No. 2009-26490

However, the lithium-ion secondary battery shipped with the above-described configuration requires caution in transportation, especially in air transportation using an aircraft whose transportation volume is limited, in order to ensure transportation safety. This is because the electrolytic solution contained in the lithium ion secondary battery is a combustible material. This is because the electrolytic solution is classified as Class 4 (flammable liquid) in the Fire Service Act. Therefore, no matter how much the safety of the lithium ion secondary battery itself is enhanced by the effect of other members, the transportation restriction does not change as long as the electrolytic solution, which is a combustible material, is used.

Also, in marine transportation using ships, lithium-ion secondary batteries must be treated as dangerous goods transportation as in air transportation, and cannot be easily transported due to transportation restrictions such as packing restrictions.

As a result, when it is necessary to carry the produced lithium ion secondary battery to a remote place, there is a problem that the number of days to carry and the cost increase.
A similar problem also exists in non-aqueous electrolyte batteries other than lithium ion secondary batteries that use a combustible electrolyte.

In addition, if moisture is mixed inside the exterior of a lithium-ion battery, problems such as gas generation inside may occur. Therefore, it is necessary to pay the utmost attention to the mixing of moisture in the manufacturing process.

In view of these circumstances, the present invention is a structure for a non-aqueous electrolyte secondary battery for realizing a non-aqueous electrolyte secondary battery that ensures transport safety while suppressing deterioration of battery performance in battery manufacturing. , A non-aqueous electrolyte secondary electric pond manufacturing apparatus and a method for manufacturing a non-aqueous electrolyte secondary battery.

An aspect of the present invention for solving the above problems is an electrode joint, an exterior member accommodating the electrode joint, and an external electrode terminal that penetrates the exterior member from the inside to the outside and is connected to the electrode joint. The tubular member is provided on the exterior member and includes at least one opening for communicating the inside and the outside of the exterior member, and the tubular member is provided directly to the opening or so as to surround the opening. The tubular member has, at least in part, a male or female joint structure, the opening is sealed by a sealing portion, and the electrode joint is the exterior member. It is in a structure for a non-aqueous electrolyte secondary battery, which is sealed by the sealing portion of the opening and does not contain an electrolyte in the exterior member.

In this embodiment, since the structure is for a non-aqueous electrolyte secondary battery that does not contain an electrolyte, there are no transportation restrictions due to the electrolyte in air transportation, etc., and transportation can be performed by any transportation means including air transportation. It can be transported safely and in a short time. Further, since the inside of the exterior member of the structure for the non-aqueous electrolyte secondary battery is hermetically sealed, moisture does not enter the inside during transportation. Further, after the structure for the non-aqueous electrolyte secondary battery is transported, the non-aqueous electrolyte secondary battery can be easily injected by opening the sealing portion of the opening of the structure for the non-aqueous electrolyte secondary battery and injecting the electrolyte. Batteries can be manufactured. Further, since it has a tubular member, it is possible to prevent water from entering the inside of the exterior member when injecting the electrolyte, and it is possible to prevent gas generation inside, so that a non-aqueous electrolyte secondary battery is manufactured. It is possible to suppress a decrease in battery performance due to moisture.

Here, it is preferable that the opening has an opening maintaining member, and the opening maintaining member is radially inside the cylinder with respect to the tubular member. According to this, even if the opening is a soft member such as a laminate, the shape of the opening can be kept constant, so that the work becomes easier when the electrolyte is injected. Further, by arranging the opening maintaining member inside the tubular member, the electrolyte can be injected in the space formed by the tubular member, so that the invasion of water can be prevented.

Further, it is preferable that the opening has an opening maintaining member, and the tubular member and the opening maintaining member are connected to each other. According to this, by forming the opening maintaining member and the tubular member with one member, the number of parts and the man-hours at the time of manufacturing can be reduced, and the cost can be reduced.

Further, it is preferable that the tubular member and the opening maintaining member do not have a penetrating portion in the axial direction of the cylinder. According to this, since there is no penetrating portion between the tubular member and the opening maintaining member, a closed space can be easily formed when the device is connected to the tubular member.

Further, it is preferable that the sealing portion is provided on the opening maintaining member. According to this, the opening can be reliably sealed by providing the sealing portion on the opening maintaining member provided in the opening and sealing the opening.

Further, it is preferable that the sealing portion has a structure in which the end portion of the opening maintaining member is covered with the sealing member. According to this, the sealing member can be easily attached by setting the attachment position of the sealing member to the opening maintaining member.

Further, the tubular member is attached to the opening, at least a part of the tubular member protrudes to the outside of the exterior member, and the joint structure protrudes to the outside of the exterior member of the tubular member. It is preferable that it is in the portion where the joint is made. According to this, it is possible to make a simple structure without providing an opening maintaining member different from the tubular member in the opening. The tubular member is fixed to the exterior material at a portion inserted inside the exterior member, and the device can be easily connected to the tubular member by providing a joint structure at a portion protruding outward of the exterior member.

Further, it is preferable that the sealing portion is provided on the tubular member. According to this, the electrolyte can be easily injected into the exterior member by opening the sealing portion of the tubular member.

Further, the sealing portion preferably has a structure in which the end portion of the tubular member is covered with the sealing member. According to this, the exterior member can be easily sealed by covering the end portion of the tubular member with the sealing member.

Further, the sealing member is preferably a gas barrier film or septum. According to this, it is possible to suppress the invasion of moisture into the exterior member by the sealing member. In addition, the sealing member can be easily penetrated to inject the electrolyte into the exterior member.

Further, it is preferable that the inside of the exterior member is sealed in a degassed state. According to this, the inside of the exterior member can be kept in a low humidity state. Therefore, the electrode active material layer provided in the electrode joint housed inside the exterior member reacts with water, and when the electrolyte is injected into the exterior member, the injected electrolyte contains water. It is possible to prevent the reaction, and it is possible to suppress the deterioration of the battery performance due to the moisture when the non-aqueous electrolyte secondary battery is manufactured.

Further, it is preferable that the tubular member is provided with a detachable cap that covers the tubular member. According to this, since the sealing portion can be protected by the cap, it is possible to prevent the sealing state from being released due to damage to the sealing member during handling or transportation of the non-aqueous electrolyte secondary battery structure. However, it is possible to maintain the internal environment of the exterior member and prevent gas containing water from entering the inside of the exterior member.

Another aspect of the present invention is a non-aqueous electrolyte secondary battery manufacturing apparatus having an environment-maintaining tube that is coupled to the tubular member of the non-aqueous electrolyte secondary battery structure according to the above aspect. The environment-maintaining tube is in a non-aqueous electrolyte secondary battery manufacturing apparatus having a joint structure paired with the joint structure of the tubular member.

In such an embodiment, by connecting the environment maintenance tube to the tubular member of the non-aqueous electrolyte secondary battery structure, a hermetically sealed structure that does not easily come off can be formed. The environment maintenance tube can cover the opening of the structure for the non-aqueous electrolyte secondary battery, and when the opening is opened, it is possible to prevent outside air containing water from entering through the opening.

Here, it is preferable that the environment maintenance tube has an electrolyte injection nozzle inside. According to this, the electrolyte can be injected from the opening by the electrolyte injection nozzle with the opening covered by the environment maintenance tube. Therefore, it is possible to suppress the invasion of outside air containing moisture from the opening.

Further, it is preferable that the environment maintenance tube has a discharge portion inside which emits low-humidity dry air or an inert gas. According to this, the inside of the environment maintenance tube can be kept in a low humidity state or an inert atmosphere, and when the opening is opened, it is possible to further suppress the invasion of outside air containing moisture from the opening. can.

Further, it is preferable that the environment maintenance tube has a degassing portion for degassing the inside. According to this, when the non-aqueous electrolyte secondary battery is injected, the gas such as air containing water existing in the environment maintenance tube can be removed, and the invasion of water can be suppressed. In addition, the gas inside the exterior can be removed, the gas inside can be discharged at the time of injecting the electrolyte, and the pressure can be reduced at the time of sealing. Further, the gas generated inside the exterior member due to the pre-charging during manufacturing can be discharged from the degassing portion to the outside of the exterior member.

Further, it is preferable that the environment maintenance tube has a sealing portion open portion inside the tube. According to this, since the sealing portion can be opened inside the environment maintenance tube to open the opening, it is possible to suppress the invasion of gas containing water from the opening into the inside of the exterior member. ..

Further, it is preferable that the environment maintenance tube has a sealing portion mounting portion inside the tube. According to this, it is possible to seal the liquid injection port after injecting the electrolyte inside the environment maintenance tube, and it is possible to suppress the invasion of gas containing water from the opening into the inside of the exterior member.

Further, another aspect of the present invention includes an electrode joint, an exterior member accommodating the electrode joint, and an external electrode terminal that penetrates the exterior member from the inside to the outside and is connected to the electrode joint. The exterior member is provided with at least one opening that communicates the inside and the outside of the exterior member, and has a tubular member directly in the opening or so as to surround the opening. The tubular member has a male or female joint structure, the opening is sealed by a sealing portion, and the electrode joint body seals the exterior member and the opening. It is sealed by a stopper, and is provided so as to be coupled to the non-aqueous electrolyte secondary battery structure, which is characterized in that no electrolyte is injected into the exterior member, and the tubular member. The environment-maintaining tube has an electrolyte injection nozzle inside, and the environment-maintaining tube has a non-aqueous electrolyte secondary having a joint structure paired with the joint structure of the tubular member. A method for manufacturing a non-aqueous electrolyte secondary battery using a battery manufacturing apparatus, wherein the non-aqueous electrolyte secondary battery manufacturing apparatus is formed on the joint structure of the tubular member of the non-aqueous electrolyte secondary battery structure. The joint structure of the environment-maintaining tube is connected, and the internal space of the environment-maintaining tube is filled with low-humidity inert gas or dry air, or degassed. A method for manufacturing a non-aqueous electrolyte secondary battery, which comprises an injection step of releasing a seal, inserting an electrolyte injection nozzle into the exterior member from the opening, and injecting an electrolyte.

In such an embodiment, the environment-maintaining tube and the tubular member are connected by a joint structure, and the electrolyte is injected in a state where the internal space formed by the environment-maintaining tube and the tubular member is filled with a low-humidity inert gas or dry air. This makes it possible to prevent gas containing moisture from entering the interior of the exterior member from the opening. Therefore, it is possible to suppress a decrease in battery performance due to moisture. Further, since the injection step is performed with the injection nozzle inserted into the exterior member, the electrolyte can be reliably injected into the exterior member.

In addition, another aspect of the present invention includes an electrode joint, an exterior member accommodating the electrode joint, and an external electrode terminal that penetrates the exterior member from the inside to the outside and is connected to the electrode joint. The exterior member is provided with at least one opening that communicates the inside and the outside of the exterior member, and has a tubular member directly in the opening or so as to surround the opening. The tubular member has a male or female joint structure, the opening is sealed by a sealing portion, and the electrode joint body seals the exterior member and the opening. It is sealed by a stopper, and is provided so as to be coupled to the non-aqueous electrolyte secondary battery structure, which is characterized in that no electrolyte is injected into the exterior member, and the tubular member. Manufacturing of a non-aqueous electrolyte secondary battery using a non-aqueous electrolyte secondary battery manufacturing apparatus having a joint structure paired with the joint structure of the tubular member. In the method, the environment-maintaining tube is connected to a storage tank in which an electrolyte is stored, and the environment-maintaining tube is placed in a state where a low-humidity inert gas or dry air is flowed through the environment-maintaining tube. It is characterized by comprising an injection step of connecting to the tubular member to release the sealed state of the sealing portion and injecting the electrolyte from the storage tank into the accommodation chamber via the environment maintenance tube. It is in the method of manufacturing a non-aqueous electrolyte secondary battery.

In such an embodiment, the environment-maintaining tube and the tubular member are connected to each other to open an opening by flowing a low-humidity inert gas or dry air through the environment-maintaining tube connecting the tubular member and the storage tank. When the opening is made, it is possible to prevent the gas containing moisture from entering the inside of the exterior member from the opening. Therefore, it is possible to suppress a decrease in battery performance due to moisture. In addition, by preliminarily setting the inside of the environment maintenance tube to a low humidity environment before connecting the environment maintenance tube and the tubular member, the environment maintenance tube is connected to the tubular member and the sealed state of the sealing portion is released. At that time, it is possible to prevent the humidity-uncontrolled gas in the environment maintenance tube from entering the accommodation chamber.

It is a top view of the structure for a lithium ion secondary battery which concerns on Embodiment 1 of this invention. It is sectional drawing of the main part of the structure for a lithium ion secondary battery which concerns on Embodiment 1 of this invention. It is sectional drawing of the main part of the structure for a lithium ion secondary battery which concerns on Embodiment 1 of this invention. It is an exploded perspective view which shows the schematic structure of the electrode connection body which concerns on Embodiment 1 of this invention. It is a flowchart explaining the manufacturing method of the structure for a lithium ion secondary battery which concerns on Embodiment 1 of this invention. It is a figure explaining the manufacturing method of the lithium ion secondary battery which concerns on Embodiment 1 of this invention. It is a figure explaining the electrolyte injection apparatus which concerns on Embodiment 1 of this invention. It is sectional drawing of the main part of the electrolyte injection apparatus which concerns on Embodiment 1 of this invention. It is sectional drawing of the main part explaining the manufacturing method of the lithium ion secondary battery which concerns on Embodiment 1 of this invention. It is a figure explaining the degassing device which concerns on Embodiment 1 of this invention. It is sectional drawing of the main part of the deaeration device which concerns on Embodiment 1 of this invention. It is sectional drawing of the main part explaining the manufacturing method of the lithium ion secondary battery which concerns on Embodiment 1 of this invention. It is a top view explaining the manufacturing method of the lithium ion secondary battery which concerns on Embodiment 1 of this invention. It is sectional drawing of the main part which shows the modification of the electrolyte injection apparatus which concerns on Embodiment 1 of this invention. It is sectional drawing of the main part explaining the modification of the structure for a lithium ion secondary battery which concerns on Embodiment 1 of this invention. It is a top view of the structure for a lithium ion secondary battery which concerns on Embodiment 2 of this invention. It is a figure explaining the electrolyte injection apparatus which concerns on Embodiment 2 of this invention. It is sectional drawing of the main part of the structure for a lithium ion secondary battery which concerns on Embodiment 3 of this invention. It is sectional drawing of the main part explaining the modification of the structure for a lithium ion secondary battery which concerns on Embodiment 3 of this invention. It is sectional drawing of the main part explaining the modification of the structure for a lithium ion secondary battery which concerns on Embodiment 3 of this invention. It is sectional drawing of the main part explaining the modification of the structure for a lithium ion secondary battery which concerns on Embodiment 3 of this invention. It is sectional drawing of the main part explaining the modification of the structure for a lithium ion secondary battery which concerns on Embodiment 3 of this invention. It is sectional drawing of the main part explaining the modification of the structure for a lithium ion secondary battery which concerns on Embodiment 3 of this invention. It is sectional drawing of the main part explaining the modification of the structure for a lithium ion secondary battery which concerns on Embodiment 3 of this invention. It is sectional drawing of the main part explaining the modification of the structure for a lithium ion secondary battery which concerns on Embodiment 3 of this invention. It is sectional drawing of the main part explaining the modification of the structure for a lithium ion secondary battery which concerns on Embodiment 3 of this invention. It is sectional drawing of the structure for a lithium ion secondary battery which concerns on Embodiment 4 of this invention. It is sectional drawing of the structure for a lithium ion secondary battery which concerns on Embodiment 4 of this invention. It is a figure explaining the electrolyte injection apparatus which concerns on other embodiment of this invention. It is an enlarged cross-sectional view of the main part which shows the modification of the structure for a lithium ion secondary battery of this invention.

Hereinafter, the present invention will be described in detail based on the embodiments.

(Embodiment 1)
FIG. 1 is a plan view of a structure for a lithium ion secondary battery, which is an example of a structure for a non-aqueous electrolyte secondary battery according to the first embodiment of the present invention. FIG. 2 is a cross-sectional view taken along the line AA'of FIG. FIG. 3 is a cross-sectional view taken along the line BB'of FIG. FIG. 4 is an exploded perspective view of the electrode joint and the external electrode terminal.

The structure for a non-aqueous electrolyte secondary battery of the present embodiment is a structure for a lithium ion secondary battery used in a lithium ion secondary battery. As shown in FIGS. 1 to 3, the structure 10 for a lithium ion secondary battery of the present embodiment has an electrode joint 20 and a pair of external electrode terminals connected to the electrode joint 20 via a clip portion 30. The tab lead 40 is provided with an electrode joint 20, a clip portion 30, and a laminated film 50 which is an exterior member in which a part of the tab lead 40 is housed.

Here, the electrode joint body 20, the clip portion 30, and the tab lead 40 of the present embodiment will be further described with reference to FIG.

The electrode joint 20 includes a positive electrode plate 21 and a negative electrode plate 22 as electrode plates. Each of the positive electrode plate 21 and the negative electrode plate 22 has an electrode active material layer formed on a metal foil. Examples of the metal foil used for the positive electrode plate 21 include aluminum foil, and examples of the metal foil used for the negative electrode plate 22 include copper foil and the like.

The positive electrode plate 21 and the negative electrode plate 22 are inserted into the valley grooves of the separator 23 so as to face each other with the separator 23 of the insulator folded in a zigzag pattern interposed therebetween, and are pressed from above and below to form an electrode joint 20 having a stack structure. It is molded into.

In such an electrode joint 20, at one end in the X direction, which is the width direction, a positive electrode side connecting portion 24, which is an end portion of a plurality of positive electrode plates 21 and in which an electrode active material layer is not formed, is provided. ..

Further, at the other end of the electrode joint 20 in the X direction, which is the width direction, a negative electrode side connecting portion 25 which is an end portion of the plurality of negative electrode plates 22 and in which the electrode active material layer is not formed is provided. .. The positive electrode side connecting portion 24 and the negative electrode side connecting portion 25 are provided so as to project from both end portions in the X direction, which is the width direction of the separator 23.

Clip portions 30 are provided and joined to the positive electrode side connecting portion 24 and the negative electrode side connecting portion 25, respectively.

The clip portion 30 holds the plurality of positive electrode side connecting portions 24 and the plurality of negative electrode side connecting portions 25, respectively, and is formed by bending a rectangular flat plate made of metal.

Further, a tab lead 40, which is an external electrode terminal on the positive electrode side, is connected to the clip portion 30 connected to the positive electrode side connecting portion 24. Further, a tab lead 40, which is an external electrode terminal on the negative electrode side, is connected to the clip portion 30 connected to the negative electrode side connection portion 25.

In the present embodiment, the clip portion 30 is provided in the electrode joint 20, but the present invention is not particularly limited to this, and the tab lead 40 on the positive electrode side may be directly connected to the positive electrode side connecting portion 24. The tab lead 40 on the negative electrode side may be directly connected to the negative electrode side connection portion 25, or the clip portion 30 may be used only for either the positive electrode side connection portion 24 or the negative electrode side connection portion 25. ..

Further, as shown in FIGS. 1 to 3, the laminate film 50, which is an exterior member of the structure 10 for a lithium ion secondary battery, is made of a plurality of resin films or a composite film obtained by laminating a plurality of resin films and a metal film. The front and back surfaces are made of insulating material. The laminate film 50 is arranged so as to sandwich the electrode joint 20 from both sides, and the outer periphery of the laminate film 50 is sealed in the circumferential direction to form a laminate pouch structure, whereby the electrode joint 20 is housed inside. Space 51 is provided.

Further, a part of the pair of tab leads 40 connected to the electrode joint 20 covered with the laminate film 50 is provided so as to penetrate from the internal space 51 of the laminate pouch to the outside. That is, the tab lead 40 is led out from the internal space 51 of the laminate pouch. The space between the perimeter of the opening (not shown) for leading the tab lead 40 from the internal space 51 of the laminated pouch to the outside and the tab lead 40 in which a part of the tab lead 40 protrudes from the opening is used for pressure crimping, for example. It is sealed with a sealant film to be formed, and the internal space 51 and the outside are prevented from communicating with each other through this opening. Therefore, the laminated pouch surrounds three sides of the electrode joint 20 in the internal space 51, and the internal space 51 is different from the outside except for the opening 61 and the degassing opening 91 provided in the laminated pouch. Do not communicate.

Further, in the state of the lithium ion secondary battery structure 10, no electrolyte is contained in the internal space 51. That is, a lithium ion secondary battery is manufactured by injecting an electrolyte into the internal space 51 of the structure 10 for a lithium ion secondary battery. Examples of the electrolyte injected into the internal space 51 include a liquid electrolyte, a gel electrolyte, a sol electrolyte, an ionic liquid, and a solid electrolyte. In this embodiment, an electrolytic solution is used as the electrolyte to be injected into the internal space 51.

The laminate film 50 extends from the region accommodating the electrode joint 20 toward one side in the Y direction orthogonal to the X direction, and the internal space 51 and the outside communicate with each other at the extended end portion. At least one opening is provided. In the present embodiment, the laminated pouch is provided with two openings, an opening 61 and an opening 91 for degassing.

Further, tubular members 62 and 92 are provided in each of the openings 61 and 91 of the laminate pouch. In the present embodiment, the opening 61 is provided with a tubular member 62, and the degassing opening 91 is provided with a degassing tubular member 92 in the Y direction of the laminated film 50. It is an end portion and is provided at both ends in the X direction.

The tubular member 62 has a tubular shape, a part of which is inserted into the opening 61, and the portion inserted into the opening 61 is fixed to the laminate film 50 which is an exterior member. In the present embodiment, the tubular member 62 has an opening at the end, that is, a cylindrical shape having a circular cross section. The shape of the tubular member 62 is not limited to the cylindrical shape, and the opening at the end, that is, the cross section may be a polygonal shape such as a quadrangle (FIG. 28).

The tubular member 62 has a large diameter portion 62a provided on the opening 61 side in the axial direction and a small diameter portion 62b provided on the side opposite to the opening 61 and having an outer diameter smaller than that of the large diameter portion 62a. Equipped. The large-diameter portion 62a of the tubular member 62 is inserted into the opening 61 and fixed to the laminate film 50 on the outer periphery of the large-diameter portion 62a. Further, the tubular member 62 is provided with a step 62c due to the difference in outer diameter between the large diameter portion 62a and the small diameter portion 62b. More specifically, when the cap 80 described later is attached to the outer circumference of the small diameter portion 62b of the tubular member 62, the cap 80 abuts on the step 62c of the tubular member 62 to prevent the cap 80 from coming into contact with the film 70. Therefore, it is possible to prevent the film 70 from being damaged by the contact of the cap 80. Of course, the tubular member 62 may be a straight cylinder having the same outer diameter in the axial direction and having no step on the outer circumference, or may be bent.

The tubular member 62 has a male or female joint structure at a portion protruding from the opening 61 to the outside of the laminated pouch. In the present embodiment, as a joint structure of the tubular member 62, a threaded portion 63 made of a male screw is provided on the outer peripheral surface of the small diameter portion 62b of the tubular member 62. The joint structure of the tubular member 62 is not particularly limited to this, and examples thereof include a flange joint, a coupling, a quick disconnect, a quick coupling, and a quick joint. Further, in the present embodiment, the joint structure is provided on the outer peripheral surface of the tubular member 62, but the joint structure may be provided on the inner peripheral surface of the tubular member 62. Such a joint structure of the tubular member 62 is for attaching / detaching a cap 80, which will be described in detail later, and for connecting a non-aqueous electrolyte secondary battery manufacturing apparatus.

Further, the lithium ion secondary battery structure 10 is provided with a film 70 which is a sealing member as a sealing portion for sealing the opening 61. In the present embodiment, the film 70 is provided at the end of the tubular member 62 on the side opposite to the laminate pouch side so as to close the opening of the tubular member 62. As a result, the opening 61 is sealed by the film 70. The film 70 sealing the opening 61 includes directly sealing the opening 61 and also sealing the opening of the tubular member 62 communicating with the opening 61. Such a film 70 is a material having a low water vapor transmittance, and can be released from the sealed state after connecting a manufacturing apparatus for a non-aqueous electrolyte secondary battery that injects an electrolyte into the internal space 51. In this embodiment, the film 70 is made of a material that is easily torn or penetrated.

A film made of a material having a low water vapor permeability means that the water vapor permeability, so-called moisture permeability, is low enough to maintain a low humidity state in the internal space 51, for example, a dew point temperature of −20 ° C. or lower. Materials such as biaxially stretched polypropylene (OPP), polyvinylidene chloride, polyvinyl butyral (PVB), aluminum foil laminate, olefin film, aluminum vapor deposition film, silica vapor deposition film, etc., are 10 g · mm / mm in JIS Z 0208. m ² · d or less, especially 1g · mm ^{/ m} 2 · d or less are particularly desirable. By using a material having a low water vapor transmittance as the film 70 in this way, it is possible to suppress the invasion of water vapor into the internal space 51 through the film 70 even in a high humidity environment, and the inside of the internal space 51. Can be kept in a low humidity state. In this embodiment, an aluminum laminate material in which an aluminum foil and a resin film such as polyethylene (PE) or polyethylene terephthalate (PET) are laminated is used.

Further, as a sealing portion for sealing the opening 61, in addition to the film, a lid having a female screw that is firmly screwed with the threaded portion 63 on the outer periphery of the tubular member 62, and a manufacturing apparatus for a non-aqueous electrolyte secondary battery. A valve, a seal, and a septum (rubber sealing of a medical vial) that can be opened by connecting the two may be provided. Further, the sealing portion for sealing the opening 61 may be sealed by a clip, welding, adhesion, or the like. However, it is preferable to attach a film to seal the opening 61 rather than sealing the opening 61 with a lid, a valve, a clip, welding, adhesion, a sealing, a septum, or the like because it is cheaper and easier. Further, when a needle-shaped injection nozzle or the like is used, it is preferable because the septum easily penetrates and the airtightness is easily maintained.

Further, it is preferable to use a material having a low gas transmittance such as oxygen and nitrogen for the film 70. In particular, when the internal space 51 is filled with an inert gas such as nitrogen or a rare gas and sealed, by using a material having a low gas permeability as the film 70, the inert gas in the internal space 51 becomes the film 70. It can be suppressed from leaking to the outside through. Further, lowering the gas permeability reduces the degree of decompression when the inside of the structure 10 for the lithium ion secondary battery is depressurized, and the gas entering the internal space 51 causes the lithium ion secondary battery to be decompressed. It is also possible to prevent the structure 10 from swelling and breaking the sealed state.

Further, a cap 80 that covers the tubular member 62 is detachably provided at an end portion of the tubular member 62 that protrudes to the outside of the laminated film 50. In the present embodiment, since the threaded portion 63 is provided on the outer periphery of the tubular member 62, the cap 80 is provided with a female screw screwed to the threaded portion 63 of the tubular member 62 on the inner peripheral surface. I tried to use the one. The cap 80 does not have to be as tightly screwed as the male screw and the female screw (for example, increasing the number of rotations when the male screw and the female screw are screwed) as strongly as the lid for sealing the opening 61 described above. , It is easy to remove before injecting the electrolyte. As a result, the cap 80 can be attached to and detached from the outer circumference of the tubular member 62. By covering the opening 61 of the tubular member 62 with the cap 80 in this way, the film 70 that seals the opening 61 can be used at an unexpected timing during transportation or handling of the lithium ion secondary battery structure 10. It is possible to prevent the film 70 from being torn, prevent moisture from entering the internal space 51 due to the tearing of the film 70, and keep the inside of the internal space 51 in a low humidity state. Further, even if the cap 80 is removed from the tubular member 62, since the opening 61 is sealed by the film 70, it is possible to prevent outside air from entering the internal space 51. Further, by simply removing the cap 80 attached to the tubular member 62, the film 70 that seals the opening 61 is exposed to the outside, and the exposed film 70 is torn, so that the internal space 51 is opened from the opening 61. The electrolyte can be easily injected into the film, eliminating the need for complicated steps. In the axial direction of the tubular member 62, the depth of the cap 80 is preferably longer than the length of the small diameter portion 62b. By making the depth of the cap 80 longer than the length of the small diameter portion 62b in this way, even if the cap 80 is tightened until it comes into contact with the step 62c, the cap 80 is prevented from coming into contact with the film 70, and the cap 80 is prevented from coming into contact with the film 70. It is possible to prevent the film 70 from being damaged due to contact with the film 70.

Further, the structure 10 for a lithium ion secondary battery of the present embodiment has a degassing tubular member 92 provided in a degassing opening 91 which is an opening for communicating the internal space 51 and the outside. A film 100, which is a sealing portion for sealing the degassing opening 91, and a cap 110 that can be attached to and detached from the degassing tubular member 92 are provided. As the degassing tubular member 92 (large diameter portion 92a, small diameter portion 92b, step c, etc.) and its peripheral configuration, the same structure as that of the tubular member 62 described above can be used.

Further, the cap 80 attached to the tubular member 62 and the degassing cap 110 attached to the degassing tubular member 92 may be different in color from each other. For example, the cap 80 is red and the degassing cap 110 is black. Thereby, when it is necessary to distinguish between the opening 61 for injecting the electrolyte and the opening 91 for degassing, the opening 61 and the opening 91 for degassing can be easily distinguished. It can be done and work efficiency can be improved.

Here, a method of manufacturing the structure 10 for a lithium ion secondary battery of the present embodiment will be described with reference to FIG. Note that FIG. 5 is a flowchart illustrating a method for manufacturing a structure for a lithium ion secondary battery according to the present embodiment.

By the kneading step of step S1 shown in FIG. 5, a plurality of materials for forming electrodes to be positive and negative electrodes are mixed to prepare an electrode slurry. Electrode slurries are prepared for the positive electrode and for the negative electrode, respectively.

Next, in the coating step of step S2, the positive electrode slurry and the negative electrode slurry prepared in the kneading step of step S1 are each coated on the metal foil sheet. The metal leaf sheet is made of aluminum or copper. Generally, the metal foil sheet has a long shape, and a desired electrode slurry is applied to both the front surface and the front and back surfaces of the metal foil sheet.

Next, in the drying step of step S3, the electrode slurry coated on the metal foil sheet in the coating step of step S2 is dried to form an electrode active material layer.

Next, in the pressing step of step S4, the electrode active material layer and the metal foil sheet are pressed (pressed). By this pressing process, the adhesion between the electrode active material layer and the metal foil sheet can be enhanced.

Next, in the cutting step of step S5, the electrode active material layer pressed by the pressing step and the metal foil sheet are cut into a desired size to form an electrode active material layer on the metal foil sheet. To manufacture.

Next, in the laminating step of step S6, a plurality of positive electrode plates 21 and negative electrode plates 22 are alternately laminated and bundled with a separator 23 interposed therebetween. Alternatively, the long positive electrode plate 21 and the negative electrode plate 22 cut to a predetermined length are overlapped with each other with the long separator 23 interposed therebetween, and the ticket is turned. As a result, the electrode joint 20 formed by superimposing the positive electrode plate 21, the separator 23, and the negative electrode plate 22 is manufactured.

Next, in the electrode assembly step of step S7, the clip portion 30 and the tab lead 40 are attached to the electrode joint body 20 manufactured in the laminating step. In this embodiment, the electrode bonding body 20, the clip portion 30, and the tab lead 40 are bonded by various welding methods such as laser welding, spot welding, and ultrasonic welding.

Next, in the in-laminate accommodation step of step S8, the clip portion 30 including the connection portion with the electrode joint 20 and the tab lead 40 is covered with the laminate film 50 so as to be wrapped, and the opening on the outer periphery of the laminate film 50 is welded. A laminated pouch structure is formed, and a closed internal space 51 is created. Further, by performing the storage step in the laminate in step S8 in a low humidity environment, the inside of the internal space 51 can be sealed in a low humidity state.

As the laminated film 50, a tubular member 62 provided with the film 70 in advance and a tubular member 92 for degassing provided with the film 100 were fixed. Of course, after covering the clip portion 30 including the connection portion between the electrode joint 20 and the tab lead 40 with the laminating film 50, the tubular member 62 and the degassing tubular member 92 are fixed to the laminating film 50. May be good. When fixing the tubular member 62 and the degassing tubular member 62 after covering the clip portion 30 including the connection portion between the electrode joint 20 and the tab lead 40 with the laminate film 50, the opening of the laminate film 50 was welded. The tubular member 62 and the degassing tubular member 92 may be fixed later, and the tubular member 62 and the degassing tubular member 92 may be fixed before welding the opening of the laminate film 50. It may be.

Further, the openings of the tubular members 62 and 92 may not be sealed with the films 70 and 100 in advance. When the openings of the tubular members 62 and 92 are not sealed with the films 70 and 100, the openings of the laminated film 50 are welded and then the tubular members 62 and 92 are sealed with the films 70 and 100. .. In any case, by performing in a low humidity environment, the inside of the internal space 51 can be finally set to a low humidity environment.

In the present embodiment, the storage step in the laminate is performed in a low humidity environment, but preferably after the drying step of step S3 at least, the structure 10 for the lithium ion secondary battery shown in FIG. 5 It is more preferable that all the manufacturing processes are performed in a low humidity environment, and that the processes performed in a low humidity environment are performed in the same dry room.

When the internal space 51 is filled with the inert gas, the method of filling the internal space 51 with the inert gas such as nitrogen may be an optimum method according to the sealing method described above. For example, the storage step in the laminate may be performed in a low humidity environment and in an atmosphere of an inert gas. Further, in order to reduce the pressure inside the internal space 51, either the opening 61 or the degassing opening 91 is used when the openings of the tubular members 62 and 92 are sealed with the films 70 and 100. After sealing one of them with a film, the inside of the internal space 51 may be depressurized and then the remaining openings may be sealed with a film, or the in-laminate accommodating step may be performed in a depressurized environment.

For the steps prior to the in-laminate storage step (step S8) performed in a low humidity environment and performed in an environment not in a low humidity environment such as outside the dry room, a drying step is added after the step. It is good. For example, if the cutting step (step S5) is performed outside the dry room, the drying step is inserted before the laminating step (step S6). In this way, the water adsorbed by the electrodes during the cutting step can be removed. Further, if the steps performed in an environment other than the low humidity environment continue, the drying step may be added after the last step of the steps performed in the environment not in the low humidity environment. In this case, although it is not necessary to prepare a lot of equipment for drying treatment, the drying time may be long due to the large amount of adsorbed moisture, and the burden on the electrode such as overdrying may be considered, so avoid this. When giving priority to the method, it is better to put a drying step after each step performed in an environment not in a low humidity environment even if the steps performed in an environment not in a low humidity environment continue.

Here, a method for manufacturing a lithium ion secondary battery, which is a non-aqueous electrolyte secondary battery using the structure 10 for a lithium ion secondary battery described above, will be described with reference to FIG. Note that FIG. 6 is a diagram illustrating a method for manufacturing a lithium ion secondary battery.

As shown in FIG. 6, the structure 10 for a lithium ion secondary battery is manufactured in the factory A by steps S1 to S8 of FIG. 5 described above. As described above, in the structure 10 for a lithium ion secondary battery, the electrolyte T is not injected into the internal space 51, and the inside of the internal space 51 is sealed in a low humidity state.

The lithium ion secondary battery structure 10 manufactured in the factory A is transported to the factory B located away from the factory A. Examples of Factory A and Factory B include cases where both are located in the same country, cases where Factory A is located in Japan, and where Factory B is located in different countries such as China and the United States.

Since the structure 10 for the lithium ion secondary battery manufactured in the factory A has not been injected with the electrolyte T, the transportation is not restricted due to the electrolyte T, so that it can be transported by any means including air transportation. Can be transported.

In the structure 10 for a lithium ion secondary battery transported to the factory B, the lithium ion secondary battery is manufactured by injecting the electrolyte T into the internal space 51 at the factory B.

Here, a method for manufacturing a lithium ion secondary battery carried out in factory B using the structure 10 for a lithium ion secondary battery of the present embodiment will be further described with reference to FIGS. 7 to 13. Note that FIG. 7 is a diagram illustrating a schematic configuration of a non-aqueous electrolyte secondary battery manufacturing apparatus. FIG. 8 is a cross-sectional view of a main part of the manufacturing apparatus for a non-aqueous electrolyte secondary battery. 9 and 12 are cross-sectional views of a main part for explaining a method of manufacturing a lithium ion secondary battery. FIG. 10 is a diagram illustrating a schematic configuration of a degassing device. FIG. 11 is a cross-sectional view of a main part of the degassing device. FIG. 13 is a plan view illustrating a method for manufacturing a lithium ion secondary battery.

The injection of the electrolyte T, which is an electrolyte, into the structure 10 for a lithium ion secondary battery is performed using the non-aqueous electrolyte secondary battery manufacturing apparatus 300 shown in FIGS. 7 and 8.

Here, the non-aqueous electrolyte secondary battery manufacturing apparatus 300 includes an electrolyte injection nozzle 311 and an environment maintenance tube 321 provided so as to cover the electrolyte injection nozzle 311.
Further, the non-aqueous electrolyte secondary battery manufacturing apparatus 300 includes a storage tank 310, an environment maintenance apparatus 320, a connection tube 322, and a holding member 330.

The holding member 330 holds the electrolyte injection nozzle 311 and the environment maintenance tube 321 and has a cylindrical shape or a polygonal cylinder shape having a space portion 331 inside, and the opening on one end side of the space portion 331 is an upper surface. Covered by section 332.

One end of a connection path 333 communicating with the space portion 331 is provided on the surface of the upper surface portion 332 opposite to the space portion 331, and one end of the connection path 333 is provided with a connection tube 322. The environment maintenance device 320 is connected.

Further, at the other end side of the holding member 330 opposite to the upper surface portion 332, that is, at the end portion where the space portion 331 opens, the base end portion of the environment maintenance tube 321 in which the space portion 331 and the internal space 321a communicate with each other is provided. It is connected. The environment maintenance tube 321 has a joint structure whose tip is paired with the joint structure of the tubular member 62, and is removable from the tubular member 62. With this structure, the tip of the environment maintenance tube 321 is connected to a connecting member having a joint structure paired with the male or female joint structure of the tubular member 62, so that when electrolytic injection is performed, the outside or the outside can be used. It is possible to prevent the environment maintenance tube from coming off due to changes in internal pressure.

Further, as the environment maintenance tube 321, elastically deformable materials such as rubber and elastomer, hard plastics such as polypropylene and polyvinyl chloride, and metals such as stainless steel (SUS) and aluminum can be used.

Here, the environment maintenance device 320 is a device for maintaining the environment of the internal space 321a of the environment maintenance tube 321 connected via the space portion 331 of the connection tube 322 and the holding member 330 to the same environment as that in the internal space 51. It is maintained in a low humidity state, that is, an environment such as a low humidity gas atmosphere (dry air), a vacuum state, or an inert gas atmosphere. That is, the holding member 330 can also function as a discharge portion for discharging low-humidity dry air or an inert gas inside the environment maintenance tube 321. The holding member 330 can also function inside the environment maintenance tube 321. It can also function as a degassing part for degassing.

For example, in order to bring the internal space 321a of the environment maintenance tube 321 into a low humidity state, the environment maintenance device 320 is, for example, a dry air supply device (dry air supply device) that supplies dry air for maintaining a low humidity gas atmosphere. ), A dehumidifying device for dehumidifying the moisture in the internal space 321a of the environment maintenance tube 321 and the like are used. Further, for example, in order to reduce the pressure in the internal space 321a of the environment maintenance tube 321, for example, a vacuum pump or the like is used as the environment maintenance device 320. Further, in order to make the internal space 321a of the environment maintenance tube 321 an inert gas atmosphere, the cylinder in which the inert gas is stored and the pressure of the inert gas from the cylinder are adjusted and supplied as the environment maintenance device 320. An inert gas supply device composed of a pressure regulator or the like, or an inert gas supply device that generates and supplies an inert gas is used. Here, the low humidity state of the internal space 321a of the environment maintenance tube 321 means, for example, a dew point temperature of −50 ° C. or lower and a water content of about 39 ppm or less. The environment maintenance device 320 may have one device having functions such as the gas supply device, the dehumidifying device, and the decompression device described above, or may have one or more of each device.

Further, the holding member 330 holds the electrolyte injection nozzle 311. The electrolyte injection nozzle 311 injects the electrolyte into the internal space 51 of the laminate film 50 by inserting the tip into the tubular member 62 and discharging the electrolyte from the tip of the electrolyte injection nozzle 311. Such an electrolyte injection nozzle 311 is made of a material such as metal or resin, and has a cylindrical shape or a polygonal tubular shape. Further, the electrolyte injection nozzle 311 has an injection needle shape provided with a sharp tip. This is because the tip of the electrolyte injection nozzle 311 of the present embodiment also functions as a sealing portion opening portion that breaks through the film 70 and opens the film 70. That is, an electrolyte injection nozzle 311 that also functions as a sealing portion opening portion is provided in the internal space 321a of the environment maintenance tube 321. Of course, the electrolyte injection nozzle 311 and the sealing portion opening portion for opening the film 70 may be separate members, and a cutter, a drill, or the like may be provided in the space portion 331 of the holding member 330 or the internal space 321a of the environment maintenance tube 321. It may have a sealing portion opening means.

Such an electrolyte injection nozzle 311 is held by the holding member 330 so that the base end side is arranged in the space 331 and the tip end side is arranged in the internal space 321a of the environment maintenance tube 321. The tip of the electrolyte injection nozzle 311 held in the internal space 321a of the environment maintenance tube 321 is located inside the tip of the environment maintenance tube 321. As a result, after the tip of the environment maintenance tube 321 is connected to the tubular member 62, the tip of the electrolyte injection nozzle 311 can be inserted into the tubular member 62, and the environment maintenance tube 321 allows the outside of the film 70 to be inserted. After preparing the environment of the above, the film 70 can be pierced by the electrolyte injection nozzle 311.

The non-aqueous electrolyte secondary battery manufacturing apparatus 300 has a sealing portion mounting portion for mounting a sealing portion for sealing the opening 61 in the space portion 331 of the holding member 330 and the internal space 321a of the environment maintenance tube 321. (Not shown) may be provided. By providing the sealing portion mounting portion in the environment maintaining tube 321 in this way, the opening 61 can be sealed inside the environment maintaining tube 321 and contains water from the opening 61 to the inside of the laminated pouch. It is possible to suppress the invasion of gas. Further, the sealing portion mounting portion can also function as a resealing means for resealing the opening 61. Since the structure for a non-aqueous electrolyte secondary battery, which is the structure for a lithium ion secondary battery 10, functions as a battery when an electrolyte is injected, the opening is resealed without performing the step of closing the laminate pouch described later. You may. Further, in order to facilitate the handling of the non-aqueous electrolyte secondary battery after the electrolyte is injected, it may be temporarily sealed.

Further, the holding member 330 is provided with a communication passage 334 for injecting the electrolyte T into the internal space 311a of the electrolyte injection nozzle 311. One end of the communication passage 334 is connected to the internal space 311a of the electrolyte injection nozzle 311. Further, the other end of the communication passage 334 is provided so as to open on the surface of the upper surface portion 332 opposite to the space portion 331, and the other end of the communication passage 334 is provided with a storage tank via the liquid injection tube 312. 310 is connected.

The electrolyte T of the electrolytic solution is stored in the storage tank 310, and the electrolyte T from the storage tank 310 is an electrolyte injection nozzle by a liquid feeding means such as a liquid feeding pump (not shown) provided in the middle of the liquid injection tube 312. The liquid is sent to 311. The liquid feeding means is not limited to the liquid feeding pump. For example, the storage tank 310 is arranged vertically above the electrolyte injection nozzle 311 and the head pressure difference between the storage tank 310 and the electrolyte injection nozzle 311 is used. The electrolyte T of the storage tank 310 may be sent to the electrolyte injection nozzle 311. Further, although not particularly shown, an on-off valve is provided in the middle of the liquid injection tube 312, and the liquid transfer of the electrolyte T from the storage tank 310 to the electrolyte injection nozzle 311 is at a desired timing by opening and closing the on-off valve. It is done in.

An injection step of injecting the electrolyte T into the internal space 51 of the structure 10 for a lithium ion secondary battery is performed by such a non-aqueous electrolyte secondary battery manufacturing apparatus 300.

Specifically, as shown in FIG. 9A, the cap 80 is removed from the tubular member 62 of the lithium ion secondary battery structure 10, and the environment maintenance tube 321 is connected to the tubular member 62.

At this time, it is preferable that the internal space 321a of the environment maintenance tube 321 is set in the same environment as the inside space 51, that is, in a low humidity state in advance by the environment maintenance device 320. Of course, after the environment maintenance tube 321 is connected to the tubular member 62, the internal space 321a of the environment maintenance tube 321 is filled with low humidity dry air or an inert gas by the environment maintenance device 320, or degassed. It may be in a state of being. However, when a dry air supply device or an inert gas supply device is used as the environment maintenance device 320, it is preferable to discharge excess gas in the internal space 321a of the environment maintenance tube 321. Before connecting to the shape member 62, it is preferable to prepare the environment of the internal space 321a of the environment maintenance tube 321 in advance by the environment maintenance device 320.

By connecting the environment maintenance tube 321 to the tubular member 62 in this way, the outside of the opening 61 in the tubular member 62 is arranged in the internal space 321a of the environment maintenance tube 321, and the outside of the opening 61 is inside. It can be in the same low humidity state as the space 51.

Next, as shown in FIG. 9B, the environment maintenance tube 321 and the electrolyte injection nozzle 311 are further moved to the tubular member 62 side, and the tip of the electrolyte injection nozzle 311 is brought into contact with the film 70 to bring the electrolyte into contact with the film 70. The film 70 is torn by the injection nozzle 311 and the tip of the electrolyte injection nozzle 311 is inserted into the opening 61. In this state, the electrolyte T is injected into the internal space 51 from the tip of the electrolyte injection nozzle 311. In such an injection step, even if the film 70 is torn by the tip of the electrolyte injection nozzle 311, the outside of the opening 61 in the tubular member 62 is arranged in the internal space 321a of the environment maintenance tube 321. It is possible to prevent gas containing water from entering the internal space 51 through the opening of the torn film 70, and it is possible to suppress deterioration of battery performance. If the environment maintenance tube 321 is not connected to the tubular member 62, the outside of the opening 61 becomes the outside air, so that the outside air (humidity) enters the internal space 51 from the opening of the film 70 torn by the electrolyte injection nozzle 311. Uncontrolled gas) invades. When the outside air enters the internal space 51, the battery performance is deteriorated by the moisture (water vapor) contained in the invaded outside air.

Further, the size can be reduced as compared with the case where the entire structure 10 for the lithium ion secondary battery and the entire electrolyte injection device for injecting the electrolyte T are arranged in a low humidity atmosphere. Only the outside of the opening 61 in the tubular member 62 needs to be in the same low humidity state as the internal space 51 by the environment maintenance tube 321, and the entire structure 10 for the lithium ion secondary battery and the entire electrolyte injection device are in the low humidity state. Compared to the case of arranging in an atmosphere, the area that must be in a low humidity atmosphere can be reduced.

Here, an example of the degassing device of the present embodiment that degass the interior space 51 via the degassing tubular member 92 will be described with reference to FIGS. 10 and 11.

As shown in FIGS. 10 and 11, the degassing device 400 includes a degassing nozzle 411 and an environment maintenance tube 421 provided so as to cover the degassing nozzle 411. Further, the degassing device 400 includes a vacuum pump 410, an environment maintenance device 420, a connecting tube 422, and a holding member 430.

The holding member 430 holds the degassing nozzle 411 and the environment maintenance tube 421, similarly to the non-aqueous electrolyte secondary battery manufacturing apparatus 300, and has a cylindrical shape or a polygonal tubular shape having a space portion 431 inside. The opening on one end side of the space portion 431 is covered with the upper surface portion 432.

One end of a connecting path 433 communicating with the space portion 431 is provided on the surface of the upper surface portion 432 opposite to the space portion 431, and one end of the connecting path 433 is provided via a connecting tube 422. The environment maintenance device 420 is connected.

Further, at the other end side of the holding member 430 opposite to the upper surface portion 432, that is, at the end portion where the space portion 431 opens, the base end portion of the environment maintenance tube 421 in which the space portion 431 and the internal space 421a communicate with each other is provided. It is connected. The environment maintenance tube 421 has a joint structure whose tip is paired with the joint structure of the degassing tubular member 92, and is removable from the degassing tubular member 92, and is a non-aqueous electrolyte secondary. The same as the environment maintenance tube 321 of the battery manufacturing apparatus 300 can be used.

Further, as the environment maintenance device 420, the same one as the environment maintenance device 320 of the non-aqueous electrolyte secondary battery manufacturing device 300 can be used. Therefore, one environment maintenance device can be commonly used between the environment maintenance device 320 of the non-aqueous electrolyte secondary battery manufacturing device 300 and the environment maintenance device 420 of the degassing device 400. As described above, the cost can be reduced by using one common environment maintenance device for the non-aqueous electrolyte secondary battery manufacturing device 300 and the degassing device 400.

Further, the degassing nozzle 411 is held by the holding member 430. The degassing nozzle 411 is for discharging the gas in the internal space 51 to the outside by inserting the tip into the inside of the tubular member 92 for degassing and sucking the gas from the tip of the degassing nozzle 411. Is. Such a degassing nozzle 411 has the same configuration as the electrolyte injection nozzle 311.

The base end side of such a degassing nozzle 411 is arranged in the space portion 431, and the tip end side is arranged in the internal space 421a of the environment maintenance tube 421. Further, the tip of the degassing nozzle 411 is located inside the tip of the environment maintenance tube 421. As a result, after the tip of the environment maintenance tube 421 is connected to the degassing tubular member 92, the tip of the degassing nozzle 411 can be arranged inside the degassing tubular member 92, and the environment can be arranged. After preparing the external environment of the film 100 by the maintenance tube 421, the film 100 can be pierced by the degassing nozzle 411.

Further, the holding member 430 is provided with a communication passage 434, one end of the communication passage 434 is connected to the internal space of the degassing nozzle 411, and the other end of the communication passage 434 is the upper surface portion 432 of the holding member 430. It is provided with an opening on the surface opposite to the space portion 431. A vacuum pump 410 is connected to the other end of the communication passage 434 via a degassing tube 412.

The vacuum pump 410 sucks the gas in the internal space 411a of the degassing nozzle 411 through the communication passage 434 and the degassing tube 412.

In order to degas the internal space 51 using such a degassing device 400, first, as shown in FIG. 12A, the degassing cap 110 is removed from the degassing tubular member 92. , The environment maintenance tube 421 of the degassing device 400 is connected to the degassing tubular member 92.

At this time, similarly to the non-aqueous electrolyte secondary battery manufacturing apparatus 300, the internal space 421a of the environmental maintenance tube 421 is previously degassed in the same environment as the internal space 51 by the environmental maintenance device 420, that is, in a low humidity state or degassed. It is preferable to keep it. Of course, after connecting the environment maintenance tube 421 to the tubular member 92, the internal space 421a of the environment maintenance tube 421 may be in a low humidity state or degassed by the environment maintenance device 420.

By connecting the environment maintenance tube 421 to the degassing tubular member 92 in this way, only the periphery of the degassing opening 91 can be in the same low humidity state as the internal space 51.

As shown in FIG. 12B, the environment maintenance tube 421 can also be used in combination with the environment maintenance tube 421 connected to the structure 10 for the lithium ion secondary battery. When gas is sealed in the internal space 51 during pouring, or when gas is generated in the internal space 51 during precharging, it is discharged to the outside via the vacuum pump 410 and the degassing nozzle 411, that is, degassing. I do. At this time, even if the film 100 is torn by the tip of the degassing nozzle 411, the outside of the degassing opening 91 is arranged in the internal space 421a of the environment maintenance tube 421, so that the torn film 100 It is possible to prevent gas containing water from entering the internal space 51 from the opening.

In such a degassing step, on the non-aqueous electrolyte secondary battery manufacturing apparatus 300 side, the environment maintenance tube 321 is connected to the tubular member 62, and the internal space 321a of the environment maintenance tube 321 is referred to as the internal space 51. It suffices if it is maintained in the same environment. At this time, the electrolyte injection nozzle 311 may be in a state of being inserted into the opening 61, or may be in a state of pulling out the electrolyte injection nozzle 311 from the opening 61.

The above example is a method in which both are used in combination, but it is also possible to connect one by one and use it alone. In that case, it is preferable to connect the environment maintenance tube 321 and inject the electrolyte, seal the tubular member 62 side, and then connect the environment maintenance tube 421 for use.

Next, a step of closing the laminate pouch will be illustrated. In order to close the laminate pouch and form the final non-aqueous electrolyte secondary battery shape, any part of the internal space 51 is sealed, and the openings 61 and 91 are the spaces containing the electrode joint 20. It is better to isolate it. An example is displayed in FIG. 13 (a). The internal space 51 is located between the storage chamber 51A, which is a portion in which the electrode joint 20 is housed, and the storage chamber 51A and the openings 61, 91, and connects the storage chamber 51A and the tubular member 62. It can be separated from the electrolyte introduction section 51B, which is the part to be finally discarded. The electrolyte injected from the opening 61 via the tubular member 62 when manufacturing the lithium ion secondary battery is injected into the storage chamber 51A via the electrolyte introduction section 51B. After injecting the electrolyte, a part of the electrolyte introduction portion 51B is closed by welding or the like to form a bonding region 53, and the storage chamber 51A is sealed. The electrode joint body 20 sealed in the accommodation chamber 51A by the joint region 53 is isolated from the openings 61 and 91. The bonding region 53 of the laminated film 50 of the present embodiment is welded and closed by ultrasonic welding.

In the step of closing the laminate pouch, the region 52 is welded to form the joint region 53 without removing the environment maintenance tube 321 of the non-aqueous electrolyte secondary battery manufacturing apparatus 300 and the environment maintenance tube 421 of the degassing apparatus 400. You may. When forming the bonding region 53, the electrode active material layer of the electrode bonding body 20 housed in the internal space 51 and the injected electrolyte T are prevented from entering the internal space 51 by a gas containing water. However, it can be prevented from being deteriorated by moisture.

Further, after removing the environment maintenance tube 321 of the non-aqueous electrolyte secondary battery manufacturing apparatus 300 and the environment maintenance tube 421 of the degassing apparatus 400, a step of closing the laminate pouch may be performed. In that case, it is preferable that the step of closing the laminate pouch is performed by resealing the openings 61 and 91 after injecting the electrolyte. By performing such a process, the frequency of use of the liquid injection device can be increased, so that the production efficiency can be improved.

After that, as shown in FIG. 13B, a cutting step of cutting the electrolyte introduction section 51B in a state where the storage chamber 51A is sealed is performed. As a result, the storage chamber 51A side in which the electrode joint 20 is housed can be used as a lithium ion secondary battery. In the cutting step of the present embodiment, the joining region 53 is cut so as to divide it so that the storage chamber 51A is maintained in a sealed state. That is, in a state where at least a part of the joint region 53 closes the accommodation chamber 51A side, that is, a part of the joint region 53 remains on the electrode joint body 20 side, the other part is cut so as to be separated. In the present embodiment, the joint region 53 is cut so as to divide the joint region 53, but the present invention is not particularly limited to this, except for the joint region 53 of the region 52 so that the entire joint region 53 remains on the electrode joint body 20 side. You may cut the part of. Further, the cutting may be performed at a portion other than the region 52 of the electrolyte introduction portion 51B. Further, in the present embodiment, the tubular member 62 and the degassing tubular member 92 are cut off by performing the cutting step, but the present invention is not particularly limited to this, and the laminated film is not performed without performing the cutting step. A lithium ion secondary battery may be used in a state where the tubular member 62 and the tubular member 92 for degassing are provided on the 50. Further, in the present embodiment, the bonding region 53 is continuously formed from one end to the other end in the X direction of the laminated film 50, but the bonding region 53 is not particularly limited to this, and the bonding region 53 is around the openings 61 and 91. It may be provided only in.

In the non-aqueous electrolyte secondary battery manufacturing apparatus 300 described above, the tip of the electrolyte injection nozzle 311 held in the internal space 321a of the environment maintenance tube 321 is located inside the tip of the environment maintenance tube 321. Therefore, the environment maintenance tube 321 is connected to the tubular member 62 before the electrolyte injection nozzle 311 comes into contact with the film 70, but the present invention is not particularly limited to this. Here, a modified example is shown in FIG. FIG. 14 is a cross-sectional view showing a modified example of the electrolyte injection device of the present invention.

As shown in FIG. 14, the environment maintenance tube 321 is provided with a bellows portion 321b bent in a bellows shape in the middle so as to be expandable and contractible. As a result, even if the tip of the electrolyte injection nozzle 311 protrudes outward from the tip of the environment maintenance tube 321, the tip of the electrolyte injection nozzle 311 becomes the film 70 by extending the bellows portion 321b of the environment maintenance tube 321. The environment maintenance tube 321 can be easily connected to the tubular member 62 before the contact.

Of course, even if the environment maintenance tube 321 is not provided with the bellows portion 321b, when the environment maintenance tube 321 is made of a stretchable material, the environment maintenance tube 321 and the electrolyte injection nozzle 311 are combined with the tubular member 62. It is possible to move relative to the connection direction.

Similarly, in the degassing device 400, if the environment maintenance tube 421 can be expanded and contracted, the environment maintenance tube 421 can be easily attached to the degassing tubular member 92.

Not only when the tubular member 62 of the present embodiment is inserted into the opening 61, the tubular member 62 covers the opening 61 from the outside, and a laminated film is formed inside the tubular member 62. 50 may be connected. An example of this is shown in FIG. Note that FIG. 15 is a cross-sectional view showing a modified example of the structure for a lithium ion secondary battery.
As shown in FIG. 15, the portion of the laminated film 50 provided with the opening 61 is inserted into the tubular member 62 and fixed to the inner peripheral surface of the tubular member 62.

(Embodiment 2)
FIG. 16 is a plan view of the structure for a lithium ion secondary battery according to the second embodiment of the present invention. The same members as those in the above-described embodiment are designated by the same reference numerals, and redundant description will be omitted.

As shown in FIG. 16, the structure 10A for a lithium ion secondary battery of the present embodiment is not provided with an opening 91 for degassing, a tubular member 92, and a film 100, and has an opening 61 and a tubular shape. Only the member 62 and the film 70, which is a sealing portion, are provided.

That is, the lithium ion secondary battery structure 10A has an electrode joint 20, a clip portion 30, a tab lead 40, a laminate film 50 as an exterior member, an opening 61 provided in the laminate pouch, and a tubular shape. A member 62, a film 70 which is a sealing member as a sealing portion provided on the tubular member 62, and a cap 80 are provided.

In the lithium ion secondary battery structure 10A of the present embodiment, which is not provided with the tubular member 92 for degassing as described above, the structure 10A for the lithium ion secondary battery of the present embodiment has the structure 10A for the lithium ion secondary battery, which is formed from the opening 61 into the internal space 51 of the laminate pouch via the tubular member 62. Electrolyte T is injected. After the electrolyte T is injected, the opening 61 or an appropriate portion of the laminate pouch is welded to form a lithium ion secondary battery. Further, if necessary, by leaving the environment maintenance tube 321 and the tubular member 62 connected, the gas accumulated in the internal space 51 from the opening 61 and the gas generated in the internal space 51 by the preliminary charging. Is degassed.

Here, the non-aqueous electrolyte secondary battery manufacturing apparatus 300 of the present embodiment will be described with reference to FIG. Note that FIG. 17 is a diagram illustrating the electrolyte injection device of the present embodiment.

As shown in FIG. 17, the non-aqueous electrolyte secondary battery manufacturing apparatus 300 includes an electrolyte injection nozzle 311 and an environment maintenance tube 321 provided so as to cover the electrolyte injection nozzle 311.
Further, the non-aqueous electrolyte secondary battery manufacturing apparatus 300 includes a storage tank 310, an environment maintenance device 320, an environment maintenance tube 321 and a holding member 330, a vacuum pump 410, and a switching tube 350.

Since the storage tank 310, the electrolyte injection nozzle 311, the environment maintenance device 320, the environment maintenance tube 321 and the holding member 330 are the same as those in the first embodiment, overlapping description will be omitted.

Further, a switching tube 350 is provided at the other end of the communication passage 334 (see FIG. 8) in which one end of the holding member 330 communicates with the internal space 311a of the electrolyte injection nozzle 311.

One end of the switching tube 350 is connected to the communication passage 334 of the holding member 330. Further, the switching tube 350 is branched into two by a three-way cock 351 on the way, and the two branched ends are connected to the storage tank 310 and the vacuum pump 410, respectively.

In such a non-aqueous electrolyte secondary battery manufacturing apparatus 300, in the injection step of injecting the electrolyte T into the internal space 51 of the lithium ion secondary battery structure 10, the storage tank 310 and the electrolyte injection nozzle are provided by the three-way cock 351. The liquid is injected by communicating with the internal space 311a of 311. Further, in order to discharge the gas accumulated in the internal space 51 to the outside, the vacuum pump 410 and the internal space 311a of the electrolyte injection nozzle 311 are communicated with each other by the three-way cock 351 to remove the gas accumulated in the internal space 51. Take care.

That is, the injection step and the degassing step can be performed only by switching the connection between the electrolyte injection nozzle 311 and the storage tank 310 and the vacuum pump 410 by the three-way cock 351. Therefore, even if the degassing tubular member 92 is not provided, the environment maintenance tube 321 is injected without being removed from the tubular member 62 in a state where the environment maintenance tube 321 is connected to one tubular member 62. Both the step and the degassing step can be performed, and it is possible to prevent the gas containing water from entering the internal space 51 of the laminated film 50. Further, since the degassing device 400 is not required, the entire device can be miniaturized and the cost can be reduced.

In the present embodiment, the non-aqueous electrolyte secondary battery manufacturing apparatus 300 is provided with a three-way cock 351 to switch the connection between the electrolyte injection nozzle 311 and the storage tank 310 and the vacuum pump 410, but this is particularly limited. Not done. For example, when a vacuum pump is used as the environment maintenance device 320, it is not necessary to provide the three-way cock 351 and the vacuum pump 410 for degassing in the non-aqueous electrolyte secondary battery manufacturing device 300. That is, after injecting the electrolyte T into the internal space 51 in the injection step, in the degassing step, the electrolyte injection nozzle 311 is simply pulled out from the tubular member 62, and the electrolyte injection nozzle 311 simply pulls out the electrolyte T through the opening of the film 70 torn by the electrolyte injection nozzle 311. The internal space 51 and the internal space 321a of the environment maintenance tube 321 communicate with each other. Therefore, only by sucking the internal space 321a of the environment maintenance tube 321 by the environment maintenance device 320, the gas generated in the internal space 51 by the preliminary charging can be sucked and discharged to the outside. As a result, the vacuum pump 410 for degassing is not required, and the size and cost can be reduced.

(Embodiment 3)
FIG. 18 is a cross-sectional view of a main part of the structure for a lithium ion secondary battery according to the third embodiment of the present invention. The same members as those in the above-described embodiment are designated by the same reference numerals, and redundant description will be omitted.

The structure 10 for a lithium ion secondary battery of the present embodiment is the electrode joint 20 and a pair of external electrode terminals connected to the electrode joint 20 via a clip portion 30 as in the above-described embodiment. It includes a tab lead 40, an electrode joint 20, a clip portion 30, and a laminated film 50 which is an exterior member in which a part of the tab lead 40 is housed.

Further, as shown in FIG. 18, the laminated pouch is provided with at least one opening 61, and the opening 61 is provided with an opening maintaining member 60. Further, a film 70, which is a sealing member, is provided as a sealing portion for sealing the opening 61 at the end opposite to the end connected to the opening 61 of the opening maintaining member 60. When the opening 61 is a soft member such as the laminate film 50, when the internal space 51 of the laminate pouch is depressurized, the opening 61 is completely closed, and the workability is deteriorated the next time the opening 61 is opened. Sometimes. Therefore, by providing the opening maintaining member 60 in the opening 61, the opening shape of the opening 61 can be kept constant, which facilitates the work at the time of injecting the electrolyte. Further, the opening maintaining member 60 may be attached to the inside or the outside of the opening 61 as long as it has a hardness sufficient to maintain the shape of the opening. Further, the shape may be on a ring, an arc shape, a polygonal shape, or may be composed of a plurality of parts.

The tubular member 62 is provided so as to surround the opening 61, that is, to surround the opening maintaining member 60. Specifically, the tubular member 62 outside the opening maintaining member 60 includes a tubular portion 621 and a fixing portion 622. The fixing portion 622 connects one end of the tubular portion 621 and the outer peripheral surface of the opening maintaining member 60 in the circumferential direction.

Further, the tubular portion 621 has a length at which the other end on the side opposite to the one end fixed to the opening maintaining member 60 projects outward from the end portion of the opening maintaining member 60 provided with the film 70. Have.
Further, the tubular portion 621 has a male or female joint structure to which the non-aqueous electrolyte secondary battery manufacturing apparatus 300 can be attached and detached. In the present embodiment, as a joint structure of the tubular portion 621, a threaded portion 63 made of a male screw is provided on the outer peripheral surface of the tubular portion 621.

Further, one end inside the tubular portion 621 is closed by the fixing portion 622, and only the other end is open inside. That is, the tubular member 62 and the opening maintaining member 60 are connected by a fixing portion 622, and no penetrating portion is provided between the tubular member 62 and the opening maintaining member 60 in the axial direction of the cylinder. As a result, when the non-aqueous electrolyte secondary battery manufacturing apparatus 300 is connected to the tubular member 62, a closed space can be easily formed inside the tubular member 62. The fixing portion 622 and the opening maintaining member 60 can be fixed by welding or adhesion using an adhesive. Further, the opening maintaining member 60 and the tubular member 62 may use integrally molded parts.

Of course, the tubular member 62 and the opening maintaining member 60 are connected by a fixing portion 622, and by providing a through hole in the fixing portion 622, the shaft of the cylinder is formed between the tubular member 62 and the opening maintaining member 60. A penetration portion may be provided in the direction. When the fixing portion 622 is provided with the through hole in this way, when the environment maintenance tube 321 and the tubular member 62 are connected by the non-aqueous electrolyte secondary battery manufacturing apparatus 300, the tubular member 62 By continuing to flow the low humidity gas inside, the inside of the tubular member 62 can be kept in a low humidity state.

When injecting the electrolyte, the electrolyte injection nozzle 311 of the non-aqueous electrolyte secondary battery manufacturing apparatus 300 is inserted into the opening 61. Further, an environment maintenance tube 321 is connected to the outer circumference of the tubular portion 621 of the tubular member 62. Therefore, the opening of the opening maintaining member 60 only needs to have an opening area sufficient for inserting the electrolyte injection nozzle 311, the opening area of the opening maintaining member 60 is made relatively small, and the areas of the films 70 are compared. It is preferable to make it smaller.

The opening maintaining member 90 and the tubular member 92 for degassing can also adopt the same configuration as the opening maintaining member 60 and the tubular member 62.

Here, a modified example of the tubular member 62 of the present embodiment is shown in FIGS. 19 to 26. 19 to 26 are cross-sectional views of a main part showing a modified example of the structure for a lithium ion secondary battery according to the third embodiment.

As shown in FIG. 19, the tubular portion 621 has an end portion on which the film 70 of the opening maintenance member 60 is provided at the other end on the side opposite to the one end portion fixed to the opening maintenance member 60 by the fixing portion 622. It may have a length that does not protrude outward. That is, one end of the end of the opening maintaining member 60 provided with the film 70 extends to the outside of the other end of the tubular portion 621.

Further, as shown in FIG. 20, the fixing portion 622 may connect the central portion of the inner peripheral surface of the tubular portion 621 to the outer peripheral surface of the opening maintaining member 60. That is, both ends of the tubular portion 621 may extend toward both ends of the opening maintaining member 60. In the example shown in FIG. 20, the tubular portion 621 has a length in which both ends thereof do not protrude outward from both ends of the opening maintaining member 60. Of course, the length of the tubular portion 621 is not particularly limited to this, and the tubular portion 621 is provided with a length such that at least one of both ends thereof projects to the outside from the end of the opening maintaining member 60. You may be.

Further, as shown in FIG. 21, the fixing portion 622 fixes one end of the tubular portion 621 on the film 70 side and the outer peripheral surface of the opening maintaining member 60, and the other end of the tubular portion 621 is an opening maintaining member. The film 70 of 60 may be arranged on the other end side opposite to the one end portion provided. In the example shown in FIG. 21, the tubular portion 621 has a length such that the end portion on the side opposite to the end portion fixed to the opening maintenance member 60 does not protrude outward from the other end portion of the opening maintenance member 60. It is provided in. Of course, the length of the tubular portion 621 is not limited to this, and the tubular portion 621 may be provided with a length such that the end portion thereof projects outward from the end portion of the opening maintaining member 60.

Further, as shown in FIG. 22, a joint structure may be provided on the inner peripheral surface of the tubular portion 621. That is, the threaded portion 63 may be provided on the inner peripheral surface of the tubular portion 621. Further, it suffices that the outer peripheral surface of the cap 80 has a shape screwed into the threaded portion 63 in accordance with this.

Further, in the present embodiment, the film 70, which is a sealing member, is provided at the opening end of the opening maintaining member 60, but the present invention is not particularly limited, and if the opening 61 can be sealed by the film 70. The film 70, which is a sealing member, may be at any position of the opening maintaining member 60.

For example, as shown in FIG. 23, the film 70 may be provided at the central portion of the opening maintaining member 60 in the axial direction.

Further, as shown in FIG. 24, the film 70 may be provided on the tubular portion 621 of the tubular member 62.
Further, as shown in FIG. 25, the film 70 may be provided on both the opening maintaining member 60 and the tubular member 62.
Further, since the tubular member 62 only needs to surround the opening maintaining member 60 that maintains the opening of the opening, as shown in FIG. 26, the tubular member 62 and the opening maintaining member 60 are fixed to each other. It does not have to be. That is, the tubular member 62 and the opening maintaining member 60 are fixed to the exterior member, respectively.

(Embodiment 4)
27 and 28 are cross-sectional views of the structure for a lithium ion secondary battery according to the fourth embodiment of the present invention. The same members as those in the above-described embodiment are designated by the same reference numerals, and redundant description will be omitted.

As shown in FIGS. 27 and 28, the structure 10 for a lithium ion secondary battery of the present embodiment is connected to an electrode joint 20 including a positive electrode plate 21 and a negative electrode plate 22 and to the positive electrode plate 21 or the negative electrode plate 22, respectively. The current collecting member 31 is provided, and the battery case 55 and the lid member 56, which are exterior members in which the electrode connecting body 20 and the electrode connecting body composed of the current collecting member 31 are housed, are provided.

At the ends of the plurality of positive electrode plates 21, a positive electrode binding portion 26 in which the portions where the electrode active material layer is not formed is bundled is provided, and the current collecting member 31 is connected to the positive electrode binding portion 26. There is.

Further, at the end of the plurality of negative electrode plates 22, a negative electrode binding portion 27 in which the portions where the electrode active material layer is not formed is bundled is provided, and the current collecting member 31 is connected to the negative electrode binding portion 27. Has been done.

Each of the current collecting members 31 connected to each of the positive electrode binding portion 26 and the negative electrode binding portion 27 is provided with a terminal portion 32 protruding outward from the through hole 57 of the lid member 56. That is, in the present embodiment, the terminal portion 32 of the current collecting member 31 corresponds to the external electrode terminal.

Such an electrode joint 20 and a part of the current collecting member 31 connected to the electrode joint 20 are housed in the battery case 55.

The battery case 55 is made of a metal material, a resin material, or the like, and has a hollow box shape in which a part of the electrode joint body 20 and a part of the side connected to the electrode joint body 20 of the current collecting member 31 is housed. , The upper part is provided with an opening.

The lid member 56 covers the upper opening of the space of the battery case 55, and is made of a metal material, a resin material, or the like.

The lid member 56 is fixed to the battery case 55 by laser welding the end portion of the lid member 56 to the upper end of the battery case 55. The method of fixing the battery case 55 and the lid member 56 is not particularly limited to this, and as long as the inside can be kept sealed, the battery case 55 may be bonded using an adhesive, and a caulking structure, screws, bolts, etc. , Clips and the like may be used for fixing. However, the battery case 55 and the lid member 56 cannot be easily fixed to each other, and a fixing method capable of maintaining the airtightness inside is preferable, and welding or the like is preferably used.

Further, the exterior member is provided with an opening 61 for communicating the inside and the outside, and the opening 61 is provided with a tubular member 62.

The lid member 56 is provided with a protruding portion 59 that projects upward in a tubular shape, and an opening 61 is provided at the tip of the protruding portion 59. A tubular member 62 is fixed to the opening 61 at the tip of the protrusion 59. The tubular member 62 has a male or female joint structure. In the present embodiment, the tubular member 62 similar to the above-described first embodiment, that is, the tubular member 62 has a large diameter portion 62a and a small diameter portion 62b, and a threaded portion that becomes a male screw on the outer circumference of the small diameter portion 62b. 63 is provided.

Further, the lithium ion secondary battery structure 10 is provided with a film 70 which is a sealing member as a sealing portion for sealing the opening 61. In the present embodiment, similarly to the first embodiment described above, the film 70 is provided at the end of the tubular member 62 on the opposite side of the opening 61 so as to close the opening of the tubular member 62. As a result, the opening 61 is sealed by the film 70. Since the details of the film 70 are the same as those in the first embodiment described above, overlapping description will be omitted.

The internal space 51 of the exterior member composed of the battery case 55 provided with the protruding portion 59 and the lid member 56 has a storage chamber 51A and an electrolyte introduction portion 51B.
The storage chamber 51A is a portion in which the electrode joint 20 is housed, and is provided inside the battery case 55.
The electrolyte introduction portion 51B is located between the accommodating chamber 51A and the tubular member 62, and connects the accommodating chamber 51A and the tubular member 62. In the present embodiment, the electrolyte introduction portion 51B is provided inside the projecting portion 59. .. Then, the electrolyte injected from the opening of the tubular member 62 when manufacturing the lithium ion secondary battery is injected into the storage chamber 51A via the electrolyte introduction section 51B.

Further, the protruding portion 59 serving as the electrolyte introducing portion 51B is provided with a region 52 that can be closed by welding or the like when an electrolyte is injected into the internal space 51 to manufacture a lithium ion secondary battery.

In the present embodiment, the region 52 for closing the protrusion 59 is provided with a recess 54 recessed from the storage chamber 51A in which the electrode joint 20 is housed. The bottom surface of the recess 54 is joined by welding or the like to form a joining region 53.

In such a structure 10 for a lithium ion secondary battery, the electrolyte T is injected into the internal space 51 from the opening 61 via the tubular member 62 by the non-aqueous electrolyte secondary battery manufacturing apparatus 300, and the region 52 is formed. A lithium ion secondary battery is manufactured by closing with welding or the like.

Further, after partially closing a part of the region 52 to form the bonding region 53, the electrolyte introduction portion 51B may be cut to separate the tubular member 62 to form a lithium ion secondary battery, and the electrolyte introduction portion 51B may be cut. Instead, it may be a lithium ion secondary battery.

When cutting the joint region 53 of the region 52, it is preferable that the region 52 is thinner than the other portions. This makes it easier to cut the region 52.

Further, the structure 10 for the lithium ion secondary battery of the present embodiment may also be provided with the tubular member 92 for degassing, as in the case of the above-described first embodiment.

Further, the structure 10 for a lithium ion secondary battery of the present embodiment is created by fixing the tubular member 62 to the opening 61 at the tip of the protruding portion 59, but the structure is also such that the protruding portion 59 is extended. good. When the lid member 56 is molded, it can be integrally formed, and the number of parts can be reduced.

(Other embodiments)
Although each embodiment of the present invention has been described above, the basic configuration of the present invention is not limited to the above.

For example, in each of the above-described embodiments, the configuration in which the electrolyte injection nozzle 311 and the environment maintenance tube 321 are provided as the non-aqueous electrolyte secondary battery manufacturing apparatus 300 has been exemplified, but the present invention is not particularly limited thereto. An example of this is shown in FIG. Note that FIG. 29 is a diagram illustrating a modified example of the electrolyte injection device.

As shown in FIG. 29, the non-aqueous electrolyte secondary battery manufacturing apparatus 300 includes a storage tank 310, an environment maintenance device 320, and an environment maintenance tube 321.

The environment maintenance tube 321 is provided so as to be connected to the tubular member 62. In the example shown in FIG. 29, the environment maintenance tube 321 is provided with a connecting member 323, which is a connecting joint for a fluid, which is detachably connected to the tubular member 62 at its tip. That is, by providing the tubular member 62 with a male or female joint structure and providing the environment maintenance tube 321 with a connecting member 323 having a joint structure paired with the tubular member 62, fluid may leak between the two. And both can be easily removed. Then, by connecting the connecting member 323 to the tubular member 62, the film 70 of the tubular member 62 is torn. In the present embodiment, the connecting member 323 and the tubular member 62 are connected by screwing a male screw provided on the outer peripheral surface of the connecting member 323 into a female screw provided on the inner peripheral surface of the tubular member 62. NS. Therefore, by inserting the connecting member 323 into the tubular member 62, the film 70 that seals the opening of the tubular member 62 can be torn. That is, the environment maintenance tube 321 also functions as a sealing portion opening portion for releasing the sealing state of the film 70 which is a sealing portion. Of course, the joint structure of the tubular member 62 and the connecting member 323 is not particularly limited to this, and for example, a flange joint, a coupling, a quick disconnect, a quick coupling, a quick joint, etc. Can be mentioned.

Further, in the environment maintenance tube 321, the end side opposite to the end portion provided with the connecting member 323 is branched into two by a three-way cock 324, and the two branched ends are each branched into a storage tank 310. And the environment maintenance device 320. That is, the environment maintenance tube 321 is connected to the storage tank 310 in which the electrolyte is stored.

In such a non-aqueous electrolyte secondary battery manufacturing apparatus 300, in the injection step of injecting the electrolyte T into the internal space 51 of the lithium ion secondary battery structure 10, the environment maintenance device 320 and the environment are previously used by the three-way cock 324. After connecting to the maintenance tube 321 to bring the inside of the environment maintenance tube 321 into the same low humidity state as the inside of the internal space 51, the connecting member 323 of the environment maintenance tube 321 is connected to the tubular member 62. When the film 70 is torn by connecting the environment maintenance tube 321 to the tubular member 62 in this way, an external gas, that is, a gas containing water, enters the internal space 51 from the opening 61. Can be prevented. Further, by preliminarily setting the inside of the environment maintenance tube 321 to a low humidity state before connecting the environment maintenance tube 321 to the tubular member 62, when the environment maintenance tube 321 is connected to the tubular member 62, the environment maintenance tube 321 is connected to the tubular member 62. It is possible to prevent the humidity-uncontrolled gas in 321 from entering the internal space 51.

After that, the environment maintenance tube 321 and the storage tank 310 are connected by the three-way cock 324, and the electrolyte T is injected into the internal space 51. As a result, the electrolyte T can be injected into the internal space 51 without invading a gas containing water. Then, after the electrolyte T is injected into the internal space 51, the opening 61 may be closed again, or the other part of the laminate pouch may be closed. Further, the lithium ion secondary battery can be manufactured by closing the region 52 in the same manner as in the above-described embodiment.

As described above, in the non-aqueous electrolyte secondary battery manufacturing apparatus 300 shown in FIG. 29, the environment maintenance tube 321 becomes unnecessary, so that the number of parts can be reduced and the cost can be reduced.

Further, in each of the above-described embodiments, the tubular member 62 exemplifies a tubular shape having a circular opening, but the present invention is not particularly limited to this, and as shown in FIG. 30, the tubular member 62 has a quadrangular opening. It may have a shape that becomes. Of course, the tubular portion of the tubular member is not limited to a circular or quadrangular opening shape, and may be a polygon other than an elliptical shape or a quadrangle.

10 ... Lithium ion secondary battery structure, 20 ... Electrode joint, 21 ... Positive electrode plate, 22 ... Negative plate, 23 ... Separator, 24 ... Positive electrode side connection, 25 ... Negative electrode side connection, 26 ... Positive electrode binding part , 27 ... Negative electrode binding part, 30 ... Clip part, 31 ... Current collecting member, 32 ... Terminal part (external electrode terminal), 40 ... Tab lead (external electrode terminal), 50 ... Laminated film, 51 ... Storage chamber, 51A ... No. 1 storage chamber, 51B ... 2nd storage chamber, 52 ... area, 53 ... joint area, 54 ... recess, 55 ... battery case, 56 ... lid member, 57 ... through hole, 58 ... connection part, 59 ... protrusion, 60 , 90 ... Opening maintenance member, 61, 91 ... Opening, 62, 92 ... Cylindrical member, 62a, 92a ... Large diameter part, 62b, 92b ... Small diameter part, 62c, 92c ... Step, 63, 93 ... Threaded part , 70, 100 ... Film (sealing member), 80, 110 ... Cap, 621 ... Cylindrical part, 622 ... Fixed part, 300 ... Non-aqueous electrolyte secondary battery manufacturing equipment, 310 ... Storage tank, 311 ... Electrode injection Nozzle, 311a ... Internal space, 312 ... Liquid injection tube, 320 ... Environmental maintenance device, 321 ... Environmental maintenance tube, 321a ... Internal space, 321b ... Bellows, 322 ... Connection tube, 323 ... Connection member, 324 ... Three-way cock, 330 ... Holding member, 331 ... Space part, 332 ... Top surface part, 333 ... Connection path, 334 ... Communication passage, 400 ... Degassing device, 410 ... Vacuum pump, 411 ... Degassing nozzle, 411a ... Internal space, 412 ... Degassing Qi tube, 420 ... environment maintenance device, 421 ... environment maintenance tube, 421a ... internal space, 422 ... connection tube, 430 ... holding member, 431 ... space part, 432 ... top surface part, 433 ... connection path, 434 ... communication path, A, B ... Factory, T ... Electrode

Claims (20)

With the electrode joint,
An exterior member accommodating the electrode joint and
An external electrode terminal that penetrates the exterior member from the inside to the outside and is connected to the electrode joint.
At least one opening provided in the exterior member and communicating the inside and the outside of the exterior member,
Equipped with
It has a tubular member directly in or around the opening.
The tubular member has at least a part of a male or female joint structure and has a male or female joint structure.
The opening is sealed by a sealing portion and is sealed.
The electrode joint is sealed by the exterior member and the sealing portion of the opening.
A structure for a non-aqueous electrolyte secondary battery, characterized in that no electrolyte is contained in the exterior member. The structure for a non-aqueous electrolyte secondary battery according to claim 1, wherein the opening has an opening maintaining member, and the opening maintaining member is inside the tubular member in the radial direction of the cylinder. The opening has an opening maintaining member
The structure for a non-aqueous electrolyte secondary battery according to claim 1 or 2, wherein the tubular member and the opening maintaining member are connected to each other. The structure for a non-aqueous electrolyte secondary battery according to claim 2 or 3, wherein the tubular member and the opening maintaining member do not have a penetrating portion in the axial direction of the cylinder. The structure for a non-aqueous electrolyte secondary battery according to any one of claims 2 to 4, wherein the sealing portion is provided on the opening maintaining member. The structure for a non-aqueous electrolyte secondary battery according to any one of claims 2 to 5, wherein the sealing portion has a structure in which an end portion of the opening maintaining member is covered with the sealing member. body. The tubular member is attached to the opening, at least a part of the tubular member protrudes to the outside of the exterior member, and the joint structure is a portion of the tubular member protruding outward from the exterior member. The structure for a non-aqueous electrolyte secondary battery according to claim 1. The structure for a non-aqueous electrolyte secondary battery according to any one of claims 1 to 7, wherein the sealing portion is provided on the tubular member. The structure for a non-aqueous electrolyte secondary battery according to any one of claims 1 to 8, wherein the sealing portion has a structure in which an end portion of the tubular member is covered with the sealing member. body. The structure for a non-aqueous electrolyte secondary battery according to claim 6 or 9, wherein the sealing member is a gas barrier film or septum. The structure for a non-aqueous electrolyte secondary battery according to any one of claims 1 to 10, wherein the inside of the exterior member is sealed in a degassed state. The structure for a non-aqueous electrolyte secondary battery according to any one of claims 1 to 11, wherein a cap covering the tubular member is detachably provided on the tubular member. A non-aqueous electrolyte secondary battery manufacturing apparatus having an environment-maintaining tube that is coupled to the tubular member of the non-aqueous electrolyte secondary battery structure according to any one of claims 1 to 12.
The environment-maintaining tube is a manufacturing apparatus for a non-aqueous electrolyte secondary battery, characterized in that it has a joint structure paired with the joint structure of the tubular member. The non-aqueous electrolyte secondary battery manufacturing apparatus according to claim 13, wherein the environment maintenance tube has an electrolyte injection nozzle inside. The non-aqueous electrolyte secondary battery manufacturing apparatus according to claim 13 or 14, wherein the environment-maintaining tube has a discharge portion that emits low-humidity dry air or an inert gas inside. The non-aqueous electrolyte secondary battery manufacturing apparatus according to any one of 12 to 15, wherein the environment maintaining tube has a degassing portion for degassing the inside. The non-aqueous electrolyte secondary battery manufacturing apparatus according to any one of claims 13 to 16, wherein the environment-maintaining tube has a sealing portion open portion inside the tube. The non-aqueous electrolyte secondary battery manufacturing apparatus according to any one of claims 13 to 17, wherein the environment-maintaining tube has a sealing portion mounting portion inside the tube. With the electrode joint,
An exterior member accommodating the electrode joint and
An external electrode terminal that penetrates the exterior member from the inside to the outside and is connected to the electrode joint.
At least one opening provided in the exterior member and communicating the inside and the outside of the exterior member,
Equipped with
It has a tubular member directly in or around the opening.
The tubular member has a male or female joint structure and has a male or female joint structure.
The opening is sealed by a sealing portion and is sealed.
The electrode joint is sealed by the exterior member and the sealing portion of the opening.
A structure for a non-aqueous electrolyte secondary battery, which is characterized in that no electrolyte is injected into the exterior member, and
It has an environment maintenance tube provided so as to be connected to the tubular member, and has an environment-maintaining tube.
The environment maintenance tube has an electrolyte injection nozzle inside.
The environment-maintaining tube is a method for manufacturing a non-aqueous electrolyte secondary battery using a non-aqueous electrolyte secondary battery manufacturing apparatus having a joint structure paired with the joint structure of the tubular member.
The joint structure of the tubular member of the non-aqueous electrolyte secondary battery structure is connected to the joint structure of the environment-maintaining tube of the non-aqueous electrolyte secondary battery manufacturing apparatus, and the environment-maintaining tube is connected. With the internal space filled with low-humidity inert gas or dry air, or in a degassed state, the sealing portion is released, and an electrolyte injection nozzle is provided from the opening to the inside of the exterior member. A method for manufacturing a non-aqueous electrolyte secondary battery, which comprises an injection step of inserting and injecting an electrolyte. With the electrode joint,
An exterior member accommodating the electrode joint and
An external electrode terminal that penetrates the exterior member from the inside to the outside and is connected to the electrode joint.
At least one opening provided in the exterior member and communicating the inside and the outside of the exterior member,
Equipped with
It has a tubular member directly in or around the opening.
The tubular member has a male or female joint structure and has a male or female joint structure.
The opening is sealed by a sealing portion and is sealed.
The electrode joint is sealed by the exterior member and the sealing portion of the opening.
A structure for a non-aqueous electrolyte secondary battery, which is characterized in that no electrolyte is injected into the exterior member, and
It has an environment maintenance tube provided so as to be connected to the tubular member, and has an environment-maintaining tube.
The environment-maintaining tube is a method for manufacturing a non-aqueous electrolyte secondary battery using a non-aqueous electrolyte secondary battery manufacturing apparatus having a joint structure paired with the joint structure of the tubular member.
The environment-maintaining tube is connected to a storage tank in which an electrolyte is stored, and the environment-maintaining tube is attached to the tubular member with a low-humidity inert gas or dry air flowing through the environment-maintaining tube. A non-aqueous electrolyte secondary comprising an injection step of connecting to release the sealed state of the sealing portion and injecting the electrolyte from the storage tank into the accommodation chamber via the environment maintenance tube. Battery manufacturing method.

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