Structure for non-aqueous electrolyte secondary battery, method for manufacturing the same, and method for manufacturing non-aqueous electrolyte secondary battery

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, and a manufacturing method therefor; a packaging body; and a nonaqueous electrolyte secondary battery and a manufacturing method therefor.SOLUTION: A structure for a nonaqueous electrolyte secondary battery includes: an electrode assembly 20; an exterior member 50 made of a film tightly sealing the electrode assembly 20; and an external electrode terminal 40 penetrating through the exterior member 50 from inside to outside, the external electrode terminal being connected to the electrode assembly 20. The external member 50 includes: a housing chamber 51A housing the electrode assembly 20 at the inside thereof; and an electrolyte introduction part 51B communicating to the housing chamber 51A, the exterior member 50 being tightly sealed while an electrolyte is not injected at the inside thereof.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to 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 method for manufacturing the same. and Non-aqueous electrolyte secondary battery of the pond and a manufacturing method thereof.

Background Art

[0002] As a 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 assembly in which electrode plates (a positive electrode plate and a negative electrode plate) having an electrode active material layer formed on an electrode metal plate such as a metal foil are stacked with a separator interposed therebetween, an exterior member that houses the electrode assembly therein, an external electrode terminal that is connected to the electrode assembly and led out from the inside to the outside of the exterior member, and a non-aqueous electrolyte such as an electrolytic solution housed in the exterior member. Such a lithium ion secondary battery includes a case housing type battery in which an electrode assembly is housed in a cylindrical battery case or a rectangular battery case having a rectangular prism shape as an exterior member, and a laminate type battery in which an electrode assembly is surrounded and sealed with a laminate film as an exterior member. Each battery is used as a single unit cell of the secondary battery or as a battery module packaged by connecting a plurality of cells in series.

[0003] In addition, the electrode active material layer and non-aqueous electrolyte used in a lithium-ion secondary battery have a problem that the desired battery performance cannot be obtained by taking in moisture. For example, when the electrode assembly is housed and sealed in the exterior member, if the electrode contains moisture, the moisture will be contained in the electrolytic solution, and when the battery is charged and discharged, the battery will swell and the function of the battery will be impaired. Therefore, in the manufacture of a lithium-ion secondary battery, particularly in the steps until injection and sealing, it is necessary to pay attention so that moisture is not brought in together with the members housed in the external members such as the electrode assembly in the exterior member, and to pay attention so that moisture is not taken in from the outside of the exterior member. In view of such circumstances, a lithium-ion secondary battery is formed by applying at least a slurry for an electrode active material to a metal plate for an electrode and drying it (a positive electrode plate, a negative electrode plate), creating an electrode assembly by stacking a plurality of electrode plates with a separator interposed therebetween, connecting an external electrode terminal to the electrode assembly, housing the electrode assembly and the electrolytic solution in the exterior member, and performing a series of processes as a continuous flow at a location where moisture is adjusted so that moisture is not taken in up to the sealing of the exterior member.

[0004] In addition, in a laminated battery, it will be sealed and shipped in a state where the electrode assembly and the electrolytic solution are housed in the laminated film.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, lithium-ion secondary batteries shipped with the above-described configuration require caution during transportation, especially air transportation using aircraft with restricted transportation volume, in order to ensure transportation safety. This is due to the fact that the electrolyte contained in the lithium-ion secondary battery is classified as Class 4 (flammable liquid) under the Fire Service Act. Therefore, even if the safety of the lithium-ion secondary battery itself is enhanced, the transportation restrictions remain the same as long as an electrolyte corresponding to Class 4 (flammable liquid) under the Fire Service Act is used.

[0007] Also, in maritime transportation using ships, lithium-ion secondary batteries need to be handled as dangerous goods transportation in the same way as air transportation, and due to transportation restrictions such as packaging restrictions, they cannot be easily transported.

[0008] As a result, when it is necessary to transport the produced lithium-ion secondary batteries to a remote location, means such as using a vehicle will be employed, which leads to problems such as an increase in the number of days of transportation and an increase in costs. Also, when transportation is difficult only by vehicle, it is necessary to transport with various restrictions such as air transportation and maritime transportation in mind, incurring costs and effort.

[0009] Note that such problems are not limited to lithium-ion secondary batteries, and they also exist in the same way in non-aqueous electrolyte secondary batteries using materials other than lithium metal oxide as the electrode active material.

[0010] In view of such circumstances, the present invention provides a structure for a non-aqueous electrolyte secondary battery and a method for manufacturing the same for realizing a non-aqueous electrolyte secondary battery that ensures transportation safety while suppressing a decrease in battery performance during battery manufacturing. and Non-aqueous electrolyte secondary of the pond The purpose is to provide a manufacturing method.

Means for Solving the Problems

[0011] An aspect of the present invention for solving the above problems includes an electrode assembly, an exterior member made of a film for sealing the electrode assembly, and an external electrode terminal that penetrates the exterior member from the inside to the outside and is connected to the electrode assembly. The exterior member includes an accommodation chamber for accommodating the electrode assembly therein and an electrolyte introduction portion communicating with the accommodation chamber. The exterior member is characterized in that it is sealed without injecting an electrolyte therein, and is a structure for a non-aqueous electrolyte secondary battery.

[0012] In such an aspect, by sealing the accommodation chamber without injecting an electrolyte, the transport amount due to the electrolyte is not limited during air transportation or the like, and transportation can be performed by any transportation means including air transportation, and transportation can be performed safely and in a short time. Further, after transporting the structure for a non-aqueous electrolyte secondary battery, the non-aqueous electrolyte secondary battery can be easily manufactured simply by opening the structure for a non-aqueous electrolyte secondary battery, injecting an electrolyte, and sealing it again. Furthermore, by sealing the exterior member, it is difficult for a gas containing moisture to enter the interior of the exterior member, preventing the electrode active material layer provided on the electrode assembly accommodated in the interior of the exterior member from reacting with moisture, and preventing the injected electrolyte from reacting with moisture when injecting the electrolyte into the interior of the exterior member, and suppressing a decrease in battery performance due to moisture when manufacturing the non-aqueous electrolyte secondary battery.

[0013] Here, it is preferable that the exterior member is continuously joined and sealed over the outer circumference of the electrode assembly in the circumferential direction. According to this, the exterior member can be easily sealed, and when manufacturing a non-aqueous electrolyte secondary battery by injecting an electrolyte into the interior of the exterior member, an opening for injecting the electrolyte into the exterior member can be easily formed.

[0014] Also, it is preferable that the electrolyte introduction portion has a height equal to or greater than the height of the accommodation chamber in the direction of arrangement of the accommodation chamber and the electrolyte introduction portion. According to this, when injecting an electrolyte into the electrolyte introduction portion, all the electrolyte to be impregnated into the electrode assembly can be held in the electrolyte introduction portion.

[0015] Further, it is preferable that the other end of the external electrode terminal, which is opposite to the one end joined to the electrode assembly, extends in a direction opposite to the electrolyte introduction portion in the arrangement direction of the accommodation chamber and the electrolyte introduction portion. According to this, when manufacturing a non-aqueous electrolyte secondary battery by closing a part on the accommodation chamber side of the electrolyte introduction portion, the external electrode terminal does not get in the way and can be easily closed.

[0016] Further, it is preferable that the interior of the exterior member is sealed in a low humidity state. According to this, since the interior of the exterior member into which the electrolyte has not been injected is sealed in a low humidity state, there is no transport restriction caused by the electrolyte during air transportation or the like, so transportation can be carried out by any means of transportation including air transportation, and transportation can be carried out safely and in a short time. Further, after transporting the structure for a lithium ion secondary battery, a lithium ion secondary battery can be easily manufactured by injecting an electrolyte into the structure for a lithium ion secondary battery.

[0017] Furthermore, another aspect of the present invention resides in a package including the structure for a non-aqueous electrolyte secondary battery described in the above aspect.

[0018] In such an aspect, the package can be transported by any means of transportation including air transportation without the amount of transportation being restricted due to the electrolyte during air transportation or the like, and can be transported safely and in a short time.

[0019] Moreover, another aspect of the present invention is a non-aqueous electrolyte secondary battery including the structure for a non-aqueous electrolyte secondary battery described in the above aspect, at least a part of the electrolyte introduction portion of the exterior member being closed and the accommodation chamber being sealed, and the accommodation chamber being filled with an electrolyte.

[0020] In such an aspect, by sealing the accommodation chamber, the amount of the electrolyte filled in the accommodation chamber can be reduced. Further, it can be used as a non-aqueous electrolyte secondary battery without cutting off an extra area of the electrolyte introduction portion of the exterior member.

[0021] Here, it is preferable that the electrolyte introduction part of the exterior member is removed leaving a part that is blocked to seal the accommodation chamber. According to this, by removing the unnecessary electrolyte introduction part, it can be made smaller than when the electrolyte introduction part is left, or it can be made the same size as the conventional one, so that the casing for accommodating the non-aqueous electrolyte secondary battery can be used as it is.

[0022] Furthermore, another aspect of the present invention is a method for manufacturing a structure for a non-aqueous electrolyte secondary battery, comprising an electrode assembly, an exterior member made of a film that seals the electrode assembly, and an external electrode terminal that penetrates the exterior member from the inside to the outside and is connected to the electrode assembly. The exterior member includes an accommodation chamber in which the electrode assembly is accommodated and an electrolyte introduction part that communicates with the accommodation chamber. The method is characterized in that the electrode assembly is accommodated in the accommodation chamber without injecting an electrolyte into the interior of the exterior member, and the interior of the exterior member is sealed.

[0023] In such an aspect, a structure for a non-aqueous electrolyte secondary battery that is sealed without an electrolyte being injected into the interior of the exterior member can be easily manufactured.

[0024] Here, in the step of sealing the exterior member, it is preferable to perform it in a low humidity environment. According to this, a structure for a non-aqueous electrolyte secondary battery in which the interior of the exterior member is sealed in a low humidity state can be easily manufactured.

[0025] Furthermore, another aspect of the present invention includes an electrode assembly, an exterior member made of a film for sealing the electrode assembly, and an external electrode terminal that penetrates the exterior member from the inside to the outside and is connected to the electrode assembly. The exterior member includes a housing chamber for housing the electrode assembly therein and an electrolyte introduction portion communicating with the housing chamber. The method for manufacturing a non-aqueous electrolyte secondary battery uses a structure for a non-aqueous electrolyte secondary battery that is sealed without injecting an electrolyte therein, and includes an unsealing step of forming an opening in the exterior member that communicates with the electrolyte introduction portion, an injection step of injecting an electrolyte into the electrolyte introduction portion through the opening, an impregnation step of impregnating the electrolyte injected into the electrolyte introduction portion into the electrode assembly housed in the housing chamber, and a sealing step of closing at least a part of the electrolyte introduction portion to seal the interior.

[0026] In such an aspect, by providing an opening in the exterior member, a non-aqueous electrolyte secondary battery can be easily manufactured only by injecting an electrolyte. Further, since the injected electrolyte can be temporarily held in the electrolyte introduction portion, in the impregnation step, the electrolyte held in the electrolyte introduction portion can be impregnated into the electrode assembly. Therefore, it is not necessary to continuously add electrolyte through the opening until impregnation is completed, and a complicated process is unnecessary. Further, before impregnation is completed, the unsealing step and the injection step can be performed on the next structure for a non-aqueous electrolyte secondary battery, so that the manufacturing process can be made more efficient and productivity can be improved.

[0027] Here, after the impregnation step, a preliminary charging step of performing preliminary charging is further included, and it is preferable that the sealing step is performed after the preliminary charging step. According to this, the gas generated in the preliminary charging step can be discharged to the outside through the opening.

[0028] Also, in the sealing step, it is preferable to close at least the boundary portion on the housing chamber side of the electrolyte introduction portion. According to this, it is possible to suppress the movement of the electrode assembly inside.

[0029] Further, it is preferable to further include a cutting step of cutting the opening side of the electrolyte introduction part in a state where the accommodation chamber is sealed after the sealing step. According to this, an extra region can be cut off, and a relatively small non-aqueous electrolyte secondary battery can be manufactured.

[0030] Further, the sealing step is performed between the injection step and the impregnation step, and it is preferable that the sealing step closes the opening side formed in the opening step. According to this, in the impregnation step, since the opening is closed, it is possible to suppress the leakage of the electrolyte from the opening, and the posture of the structure for non-aqueous electrolyte secondary battery is not restricted.

[0031] Further, it is preferable to further include a preliminary charging step of performing preliminary charging after the impregnation step, and a partitioning step of sealing the accommodation chamber by closing at least a part of the electrolyte introduction part after the preliminary charging step. According to this, it is possible to suppress the gas generated by the preliminary charging from being discharged to the outside. Further, the gas generated by the preliminary charging can be sealed in the electrolyte introduction part in the partitioning step.

[0032] Further, it is preferable to further include a cutting step of cutting the opening side of the electrolyte introduction part in a state where the accommodation chamber is sealed after the partitioning step. According to this, an extra region can be cut off, and a relatively small non-aqueous electrolyte secondary battery can be manufactured. Further, the gas sealed in the electrolyte introduction part by the partitioning step can be separated from the non-aqueous electrolyte secondary battery without being discharged to the outside.

[0033] Further, it is preferable to perform the injection step to the other non-aqueous electrolyte secondary battery structure while performing the impregnation step to one non-aqueous electrolyte secondary battery structure into which the electrolyte is injected in the injection step. According to this, while performing the impregnation step to one non-aqueous electrolyte secondary battery structure, the injection step can be performed to the other non-aqueous electrolyte secondary battery structure, so that the manufacturing efficiency can be improved and the productivity can be improved.

Brief Description of the Drawings

[0034]

Figure 1

Figure 2

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Figure 15

Embodiment for Carrying Out the Invention

[0035] The present invention will be described in detail below based on embodiments.

[0036] (Embodiment 1) FIG. 1 is a perspective view of a lithium-ion secondary battery structure which is an example of a non-aqueous electrolyte secondary battery structure according to Embodiment 1 of the present invention. FIG. 2 is a plan view of the lithium-ion secondary battery. FIG. 3 is a cross-sectional view taken along line A-A' of FIG. 2. FIG. 4 is an exploded perspective view of the electrode assembly and the external electrode terminals.

[0037] The non-aqueous electrolyte secondary battery structure of the present embodiment is a lithium-ion secondary battery structure used in a lithium-ion secondary battery. As shown in FIGS. 1 to 3, the lithium-ion secondary battery structure 10 of the present embodiment includes an electrode assembly 20, a tab lead 40 which is a pair of external electrode terminals connected to the electrode assembly 20 via a clip 30, and a laminate film 50 which is an exterior member that houses a part of the electrode assembly 20, the clip 30, and the tab lead 40.

[0038] Here, the electrode assembly 20, the clip 30, and the tab lead 40 of the present embodiment will be further described with reference to FIG. 4.

[0039] The electrode assembly 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 is formed by forming an electrode active material layer on a metal foil. Examples of the metal foil used for the positive electrode plate 21 include aluminum foil, etc., and examples of the metal foil used for the negative electrode plate 22 include copper foil, etc.

[0040] The positive electrode plate 21 and the negative electrode plate 22 are inserted into each valley groove of the separator 23 so as to face each other with the zigzag-folded insulator separator 23 interposed therebetween, and are formed into the electrode assembly 20 having a stack structure by pressing from the vertical direction.

[0041] In such an electrode assembly 20, at one end in the X direction which is the width direction, there are provided positive electrode side connection portions 24 which are the end portions of a plurality of positive electrode plates 21 and where an electrode active material layer is not formed. Also, at the other end in the X direction which is the width direction of the electrode assembly 20, there are provided negative electrode side connection portions 25 which are the end portions of a plurality of negative electrode plates 22 and where an electrode active material layer is not formed. These positive electrode side connection portions 24 and negative electrode side connection portions 25 are provided so as to protrude from both ends in the X direction which is the width direction of the separator 23 respectively.

[0042] Clips 30 are respectively provided on and joined to the positive electrode side connection portions 24 and the negative electrode side connection portions 25.

[0043] The clip 30 is for gathering together a plurality of positive electrode side connection portions 24 and a plurality of negative electrode side connection portions 25 respectively, and is formed by bending a rectangular flat plate made of metal.

[0044] Also, a tab lead 40 made of a conductive material which is an external electrode terminal on the positive electrode side is connected to the clip 30 connected to the positive electrode side connection portion 24. Also, a tab lead 40 which is an external electrode terminal on the negative electrode side is connected to the clip 30 connected to the negative electrode side connection portion 25.

[0045] Note that in this embodiment, clips 30 are provided on the electrode assembly 20, but it is not particularly limited thereto. The positive electrode side tab lead 40 may be directly connected to the positive electrode side connection portion 24, the negative electrode side tab lead 40 may be directly connected to the negative electrode side connection portion 25, or clips 30 may be used for only either one of the positive electrode side connection portion 24 and the negative electrode side connection portion 25.

[0046] Also, 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 film-like material, for example, a composite film formed by laminating a plurality of resin films or a plurality of resin films and a metal film, and its front and back surfaces are made of an insulating material. In the present embodiment, two laminate films 50 are overlapped in the Z direction, and the outer periphery is continuously joined over the circumferential direction, thereby providing an internal space 51 in which the electrode assembly 20 is accommodated.

[0047] Also, a part of a pair of tab leads 40 connected to the electrode assembly 20 covered with the laminate film 50 is provided so as to penetrate from the internal space 51 of the laminate film 50 to the outside. That is, the tab lead 40 is led out from the internal space 51 of the laminate film 50 to the outside. Between the periphery of the opening of an opening (not shown) for leading out this tab lead 40 from the internal space 51 of the laminate film 50 and the tab lead 40 that partially protrudes from this opening, for example, it is sealed by a sealant layer used for pressure bonding, and the internal space 51 and the outside do not communicate with each other at this opening. For this reason, the laminate film 50 surrounds the entire circumference of the electrode assembly 20 in the internal space 51, and the internal space 51 does not communicate with the outside. Note that the sealant layer that joins the tab lead 40 and the laminate film 50 is formed on the surface of the tab lead 40. As such a sealant layer, for example, thermoplastic resins such as polypropylene (PP), polyethylene (PE), polystyrene (PS), polyethylene terephthalate (PET), or modified PP are used. The sealant layer may be provided as only one layer, or may be provided as two or more layers. When providing a plurality of sealant layers, they may be the same material, may use different materials, or may be a combination with a modified resin of the same material. Also, by welding the sealant layer formed on the tab lead 40 and the resin of the laminate film 50, it is possible to suppress moisture such as external humidity from entering inside from between the tab lead 40 and the laminate film 50. Also, when an electrolytic solution, which is an electrolyte, is injected inside, it is possible to suppress the electrolytic solution from leaking to the outside from between the tab lead 40 and the laminate film 50.

[0048] Further, the other end portion of the tab lead 40, which is opposite to one end connected to the electrode assembly 20, i.e., the end portion provided outside the laminate film 50, extends in a direction opposite to the electrolyte introduction portion 51B in the Y direction, which is the juxtaposition direction of the electrolyte introduction portion 51B and the accommodation chamber 51A. That is, when viewed in plan from the Z direction, the tab lead 40 is provided in a so-called L shape, extending in the X direction from the electrode assembly 20 and also extending in the Y direction. As a result, although details will be described later, when performing a sealing process of closing the accommodation chamber 51A by blocking a part of the electrolyte introduction portion 51B, the other end portion of the tab lead 40 does not get in the way, so that the portion of the electrolyte introduction portion 51B closest to the accommodation chamber 51A can be easily blocked. Of course, the tab lead 40 may extend such that the other end portion bends toward the electrolyte introduction portion 51B side. However, if the other end portion of the tab lead 40 extends toward the electrolyte introduction portion 51B side, the other end portion of the tab lead 40 gets in the way in the sealing process, so there is a possibility that it becomes difficult to block the accommodation chamber 51A side of the electrolyte introduction portion 51B.

[0049] Note that the other end of the tab lead 40 is bent so as to overlap with the portion where the electrode assembly 20 is accommodated in the Z direction when manufacturing the lithium-ion secondary battery, and is connected to the external terminal. For this reason, it is preferable that the other end of the tab lead 40 has a length protruding in the Y direction from the laminate film 50. Thereby, when the tab lead 40 is bent, the other end portion of the tab lead 40 can be made to protrude from the outer periphery of the laminate film 50, making it easier to connect to the external terminal.

[0050] The laminate film 50, which is an exterior member, extends from the region accommodating the electrode assembly 20 toward one side in the Y direction orthogonal to the X direction. The end portion of the laminate film 50 extending toward one side in the Y direction is sealed in the same manner as the other outer peripheral portions.

[0051] The internal space 51 of such a laminate film 50 includes an accommodation chamber 51A and an electrolyte introduction portion 51B. In the present embodiment, the accommodation chamber 51A and the electrolyte introduction portion 51B are juxtaposed in the Y direction.

[0052] The accommodation chamber 51A is a portion where the electrode assembly 20 is accommodated inside.

[0053] The electrolyte introduction part 51B is provided in communication with the accommodation chamber 51A. Further, the electrolyte introduction part 51B of the present embodiment is provided so that the width in the X direction is the same as the width of the accommodation chamber 51A. That is, the laminate film 50 has a rectangular shape when viewed in plan from the Z direction.

[0054] This electrolyte introduction part 51B is a part for introducing the electrolytic solution, which is the electrolyte injected from the opening provided in the laminate film 50 at an opening communicating with the electrolyte introduction part 51B, into the accommodation chamber 51A when manufacturing a lithium-ion secondary battery. That is, the electrolytic solution injected into the electrolyte introduction part 51B from the opening is impregnated into the electrode assembly 20 accommodated in the accommodation chamber 51A, and is temporarily held in the electrolyte introduction part 51B until the electrolytic solution is sufficiently impregnated into the electrode assembly 20. For this reason, the electrolyte introduction part 51B has a volume capable of holding the electrolytic solution to be impregnated into the electrode assembly 20. For example, as shown in FIG. 2, it is preferable that the electrolyte introduction part 51B has a height h2 that is equal to or greater than the height h1 of the accommodation chamber 51A in the Y direction, which is the arrangement direction of the accommodation chamber 51A and the electrolyte introduction part 51B. In this way, by making the height h2 of the electrolyte introduction part 51B equal to or greater than the height h1 of the accommodation chamber 51A (h2 ≧ h1), all the electrolytic solution to be impregnated into the electrode assembly 20 can be temporarily held in the electrolyte introduction part 51B. Of course, it is not limited to this. When the electrolytic solution is injected in two or more portions, the height h2 of the electrolyte introduction part 51B may be lower than the height of the accommodation chamber 51A.

[0055] Further, in a portion where the electrolyte introduction portion 51B of the laminate film 50 is provided, a region 52 is provided which can be closed by welding or the like when a lithium ion secondary battery is manufactured by injecting an electrolyte into the internal space 51. This region 52 is continuously provided across the X direction of the laminate film 50 so that the accommodation chamber 51A can be sealed by joining two laminate films 50 facing each other in the Z direction. After an electrolytic solution, which is an electrolyte, is injected into the internal space 51, at least a part of the region 52 (that is, in the X direction in FIG. 1, it is continuously closed and at least a part is closed in the Y direction. In this embodiment, the closed portion is referred to as a joining region 53) is closed, thereby partitioning the internal space 51 into an accommodation chamber 51A in which the electrode assembly 20 is accommodated and an opening side of the electrolyte introduction portion 51B. Such a region 52 is provided in at least a part of the electrolyte introduction portion 51B.

[0056] In this embodiment, a part of the portion where the electrolyte introduction portion 51B of the laminate film 50 is formed serves as the region 52, and a part of this region 52 serves as the joining region 53. However, it is not particularly limited thereto. The entire surface where the electrolyte introduction portion 51B is formed may be used as the region 52, and the entire range of the region 52 may be joined so that the entire region 52 (entirely in the X direction and the Y direction) serves as the joining region 53.

[0057] Also, in this embodiment, the internal space 51 is partitioned into two spaces by welding the joining region 53 of the region 52. However, the present invention is not particularly limited thereto. As long as the accommodation chamber 51A side in which the electrode assembly 20 is accommodated can be partitioned so as not to communicate with the outside, the joining region 53 of the region 52 may be adhered with an adhesive or an adhesive film inside the exterior member 50 (inside the internal space 51). Further, the joining region 53 is preferably provided at a position as close as possible to the electrode assembly 20. That is, a region 52 for closing is provided between the electrode assembly 20 of the laminate film 50 and the opening communicating with the electrolyte introduction portion 51B. It is preferable that the position close to the electrode assembly 20 in the region 52 for closing is actually joined to form the joining region 53. Thereby, when a lithium ion secondary battery is manufactured by closing the joining region 53 of the region 52 for closing, the volume of the lithium ion secondary battery can be reduced as much as possible, and miniaturization can be achieved.

[0058] Incidentally, as shown in FIG. 2, in the laminate film 50, the portion that becomes the accommodation chamber 51A is formed in a convex shape compared to other regions so that a space capable of accommodating the thick electrode assembly 20 is formed. That is, the regions other than the accommodation chamber 51A of the laminate film 50, that is, the outer peripheral portion to be welded and the region 52 for closing, are formed so that the two opposing surfaces of the laminate film 50 are easily adhered to each other. The electrolyte introduction portion 51B closes the internal space 51 by bringing the two laminate films 50 into contact with each other during sealing. Here, the fact that the internal space 51 is closed means that the laminate films 50 are not joined to each other but are simply in contact with each other. In this way, by closely adhering the opposing laminate films 50 in the closing region 52, when the two opposing surfaces of the laminate film 50 are closely adhered to each other by welding or the like in order to join the opposing laminate films 50, it is difficult for wrinkles to occur due to slack, preventing the occurrence of poor joining of the opposing laminate films 50 and preventing the two spaces partitioned by the joining region 53 of the internal space 51 from communicating with each other. Incidentally, if the entire laminate film 50 is molded to have a slack such that a space capable of accommodating the electrode assembly 20 is formed without providing the accommodation chamber 51A in a convex shape, when a part of the region 52 is joined by welding, wrinkles are likely to gather due to the slack, and poor joining may occur in the gaps of such wrinkles, resulting in a risk that the two spaces partitioned by the joining region 53 of the internal space 51 may communicate with each other. In the present embodiment, since the region that becomes the accommodation chamber 51A is molded to be convex and in the electrolyte introduction portion 51B, the opposing laminate films 50 are brought into close contact with each other, it is difficult for wrinkles to gather when the region 52 is joined, and the opposing laminate films 50 can be surely joined by welding or the like without gaps, and the accommodation chamber 51A can be surely sealed without communicating the two spaces partitioned by the joining region 53 of the internal space 51.

[0059] Such a structure 10 for a lithium-ion secondary battery is sealed without injecting an electrolytic solution, which is an electrolyte, into the internal space 51 of the laminate film 50. Here, the fact that no electrolytic solution is injected into the laminate film 50 means that components of the electrolyte such as the electrolytic solution do not exist inside the laminate film 50. That is, an electrode assembly 20 not impregnated with the electrolytic solution is accommodated inside the laminate film 50.

[0060] Also, in the present embodiment, the internal space 51 of the laminate film 50 is sealed in a low-humidity state. Here, the fact that the internal space 51 is in a low-humidity state means an environment with a moisture content such that the electrode assembly 20 inside the internal space 51 and the electrolytic solution later injected into the internal space 51 do not contain moisture that would impair the function of the battery, for example, a highly dry state with a dew point temperature of -20°C or lower. By sealing the inside of the internal space 51 in a low-humidity state in this way, it is possible to suppress the deterioration of the electrode active material layer of the electrode assembly 20 due to moisture in the internal space 51, and ultimately suppress the degradation of the battery performance as a battery. Also, by sealing the inside of the internal space 51 in a low-humidity state, when an electrolytic solution is later injected into the internal space 51 to manufacture a lithium-ion secondary battery, it is possible to suppress the intake of the moisture in the internal space 51 into the electrolytic solution injected into the internal space 51, and suppress the degradation of the performance of the lithium-ion secondary battery. Incidentally, in a lithium-ion secondary battery, a non-aqueous electrolytic solution, which is generally a non-aqueous electrolyte, is used, but when moisture is taken into the non-aqueous electrolytic solution, the lithium-ion secondary battery cannot exhibit the desired performance as a battery.

[0061] Such a low-humidity state inside the internal space 51 can be achieved, for example, by replacing the gas inside the internal space 51 with a gas in a low-humidity state. The gas inside the internal space 51 is not particularly limited as long as it is in a low-humidity state, and may be air, or may be an inert gas such as nitrogen or a noble gas.

[0062] In addition, the low humidity state in the internal space 51 can also be achieved by reducing the pressure to a pressure lower than atmospheric pressure (1 Pa) (negative pressure). That is, the inside of the internal space 51 may be sealed in a degassed (evacuated) state. Note that the vacuum state refers to a pressure of, for example, 1 Pa or less, preferably 0.1 Pa or less. In particular, by degassing the internal space 51 to a low humidity state, it is possible to suppress the gas in the internal space 51 from expanding due to changes in atmospheric pressure or temperature during the transportation of the lithium-ion secondary battery structure 10, thereby preventing the sealing of the laminate film 50 from being released. Also, by degassing the internal space 51 to a low humidity state, the lithium-ion secondary battery structure 10 can be miniaturized, saving space during storage and transportation.

[0063] In such a lithium-ion secondary battery structure 10, since no electrolyte is injected into the internal space 51, transportation by any means of transportation, including air transportation and sea transportation, can be carried out without restrictions on transportation caused by the electrolyte during air transportation or the like, and transportation can be carried out safely and in a short time. Also, by sealing the internal space 51 of the exterior member 50, it is possible to suppress moisture and the like in the external atmosphere from entering the internal space 51. In particular, by sealing the internal space 51 of the lithium-ion secondary battery structure 10 in a low humidity state, it is possible to suppress moisture from entering the internal space 51, suppress the deterioration of the electrode active material layer of the electrode assembly 20 due to moisture, and ultimately suppress the degradation of the battery performance as a battery. Also, by sealing the inside of the internal space 51 in a low humidity state, when an electrolyte is later injected into the internal space 51 to manufacture a lithium-ion secondary battery, it is possible to suppress the moisture in the internal space 51 from being taken into the electrolyte injected into the internal space 51, and suppress the degradation of the performance of the lithium-ion secondary battery.

[0064] In addition, such a lithium-ion secondary battery structure 10 is transported as a package that is packaged for transport. Here, an example of the package is shown in FIG. 5. Note that FIG. 5 is a diagram for explaining the package of the present embodiment.

[0065] As shown in FIG. 5, the package 100 includes a plurality of lithium ion secondary battery structures 10 and a packaging case 101 in which the plurality of lithium ion secondary battery structures 10 are accommodated inside.

[0066] The plurality of lithium ion secondary battery structures 10 are stacked in the Z direction, which is the thickness direction, inside the packaging case 101.

[0067] Further, the packaging case 101 has a hollow box shape formed of cardboard, resin, metal, or the like. A plurality of lithium ion secondary battery structures 10 are arranged inside such a packaging case 101.

[0068] By accommodating the plurality of lithium ion secondary battery structures 10 in the packaging case 101 in this way, it is possible to transport the plurality of lithium ion secondary battery structures 10 simultaneously.

[0069] Although not particularly shown, each lithium ion secondary battery structure 10 is preferably accommodated in the packaging case 101 in a state where it is wrapped with a cushioning material around it. As the cushioning material, for example, porous materials such as styrofoam and sponge, paper, a bag containing air (air cushioning material), etc. can be used. By providing a cushioning material around the lithium ion secondary battery structure 10 in this way, it is possible to suppress breakage such as tearing of the laminate film 50 due to the lithium ion secondary battery structures 10 coming into contact with each other during transportation.

[0070] Also, in this embodiment, the package 100 is one that packages a plurality of lithium ion secondary battery structures 10, but it is not particularly limited to this, and the package may be one that packages one lithium ion secondary battery structure 10.

[0071] Here, the manufacturing method of the lithium ion secondary battery structure 10 of this embodiment will be described with reference to FIG. 6. Note that FIG. 6 is a flowchart for explaining the manufacturing method of the lithium ion secondary battery structure of this embodiment.

[0072] Through the kneading process of step S1 shown in FIG. 6, a plurality of materials for forming electrodes that will become the positive and negative electrodes are mixed (kneaded) to form an electrode slurry to be applied onto a metal foil sheet that will become, for example, aluminum (positive electrode) or copper (negative electrode). Although the electrode slurries for the positive and negative electrodes are created separately, in the kneading process, a kneading device for forming the positive electrode slurry and a kneading device for forming the negative electrode slurry are prepared, and the formation of these two types of slurries is carried out in parallel. Of course, the two types of slurries may be formed sequentially.

[0073] Next, in the coating process of step S2, the positive electrode slurry and the negative electrode slurry formed in the kneading process of step S1 are each applied onto a metal foil sheet. The positive electrode slurry is applied onto an aluminum foil sheet that will become the positive electrode plate, and the negative electrode slurry is applied onto a copper foil sheet that will become the negative electrode plate. Generally, the metal foil sheet is in a long shape, and the desired electrode slurry is applied onto the surface or both the front and back surfaces of this metal foil sheet.

[0074] Next, in the drying process of step S3, the electrode slurry applied onto the metal foil sheet in the coating process of step S2 is dried to form an electrode active material layer composed of the dried electrode slurry.

[0075] Next, in the pressing process of step S4, the electrode active material layer and the metal foil sheet are pressed. Through this pressing process, the adhesion between the electrode active material layer and the metal foil sheet can be enhanced.

[0076] Next, in the cutting process of step S5, the electrode plate with the electrode active material layer formed on the metal foil sheet is manufactured by cutting the electrode active material layer and the metal foil sheet that have been pressed in the pressing process into a desired size.

[0077] Note that, similar to the kneading process in step S1, the coating process in step S2 to the cutting process in step S5 can be performed in parallel for the positive electrode and the negative electrode, respectively. As a result, when the cutting process is completed, a plurality of positive electrode plates 21 and a plurality of negative electrode plates 22 can be prepared.

[0078] Next, in the stacking process of step S6, a plurality of positive electrode plates 21 and negative electrode plates 22 are alternately stacked and bundled with a separator 23 interposed therebetween. Alternatively, a long positive electrode plate 21 and a long negative electrode plate 22, each cut to a predetermined length, are overlapped and wound with a long separator 23 interposed therebetween. As a result, an electrode assembly 20 composed of the positive electrode plate 21, the separator 23, and the negative electrode plate 22 stacked together is manufactured.

[0079] Next, in the electrode assembly process of step S7, a clip 30 and a tab lead 40 are attached to the electrode assembly 20 manufactured in the stacking process. In this embodiment, the electrode assembly 20, the clip 30, and the tab lead 40 are joined by various welding methods such as laser welding, spot welding, and ultrasonic welding.

[0080] Next, in the laminate housing process of step S8, the clip 30 including the connection portion with the electrode assembly 20 and the tab lead 40 is wrapped and covered with a laminate film 50, and the opening on the outer periphery of the laminate film 50 is welded to form a sealed internal space 51.

[0081] The welding of the outer periphery of the laminate film 50 other than the tab lead 40 can be joined by ultrasonic welding or the like. Also, the welding of the tab lead 40 and the laminate film 50 can be joined by welding the sealant layer provided on the tab lead 40 and the laminate film 50 as described above.

[0082] Note that for the processes carried out in an environment other than a low-humidity environment, such as outside the dry room, before the laminate accommodation process (step S8) carried out in a low-humidity environment, it is advisable to insert a drying process after that process. For example, if the cutting process (step S5) is carried out outside the dry room, a drying process should be inserted before the lamination process (step S6). By doing so, the moisture adsorbed by the electrodes during the cutting process can be removed. Also, if it seems that processes carried out in an environment other than a low-humidity environment will continue, a drying process can be inserted after the last process among the processes carried out in an environment other than a low-humidity environment. In this case, although it is not necessary to prepare a large number of facilities for drying treatment, since the adsorbed moisture increases, the drying time may become longer, and a burden on the electrodes such as over-drying is also conceivable. Therefore, when giving priority to avoiding this, even when processes carried out in an environment other than a low-humidity environment continue, it is better to insert a drying process after each of the processes carried out in an environment other than a low-humidity environment.

[0083] By carrying out such a laminate accommodation process in a low-humidity environment, the internal space 51 can be sealed in a low-humidity state.

[0084] Also, in this embodiment, the laminate accommodation process is carried out in a low-humidity environment. However, after at least going through the drying process in step S3, preferably, all of the manufacturing process of the lithium ion secondary battery structure 10 shown in FIG. 6 is carried out in a low-humidity environment. Furthermore, it is more preferable that the processes carried out in a low-humidity environment are carried out in the same dry room. Also, when filling the internal space 51 with an inert gas, the method of filling the internal space 51 with an inert gas such as nitrogen can be carried out in an optimal method according to the above-described sealing method. For example, the laminate accommodation process may be carried out in a low-humidity environment and in an inert gas atmosphere. Furthermore, to make the internal space 51 in a depressurized state, after welding parts other than the opening of the laminate film 50, when sealing the opening, the internal space 51 can be put in a depressurized state and then the opening can be sealed, or the laminate accommodation process can be carried out in a depressurized environment. By doing so, the internal space 51 of the laminate film 50 can be easily sealed in a low-humidity state.

[0085] Here, a method for manufacturing a lithium-ion secondary battery, which is a non-aqueous electrolyte secondary battery using the above-described structure 10 for a lithium-ion secondary battery, will be described with reference to FIG. 7. Note that FIG. 7 is a diagram for explaining the method for manufacturing a lithium-ion secondary battery.

[0086] As shown in FIG. 7, in factory A, the structure 10 for a lithium-ion secondary battery is manufactured by the above-described steps S1 to S8. As described above, the structure 10 for a lithium-ion secondary battery has the electrolyte solution T not injected into the internal space 51 and is sealed. Further, in the present embodiment, the internal space 51 of the structure 10 for a lithium-ion secondary battery is sealed in a low-humidity state by the above-described steps S1 to S8.

[0087] The structure 10 for a lithium-ion secondary battery manufactured in factory A is transported to factory B located at a place away from factory A. For example, when factory A is in Aomori Prefecture and factory B is in Hiroshima Prefecture, or when factory A is in Hokkaido and factory B is in Okinawa, etc., both factory A and factory B are in Japan, or when factory A is in Japan and factory B is abroad such as in China or the United States of America. In the present embodiment, the case where factory A for manufacturing the structure 10 for a lithium-ion secondary battery is in Japan is described, but of course, it can also be applied when factory A is abroad and factory B is in Japan.

[0088] Factory A and factory B are located at a distance that requires transportation using transportation means such as cars, trains, ships, airplanes, etc. Since the electrolyte solution T is not injected into the structure 10 for a lithium-ion secondary battery manufactured in factory A, there are no transportation restrictions due to the electrolyte solution T, and thus it can be transported by any transportation means including air transportation.

[0089] Note that the transportation of the structure 10 for a lithium-ion secondary battery can be improved in transportation efficiency by transporting a plurality of them together in the state of the above-described package 100.

[0090] The structure 10 for a lithium-ion secondary battery transported to Factory B is used to manufacture a lithium-ion secondary battery by injecting an electrolytic solution T into the internal space 51 in Factory B.

[0091] Here, a method for manufacturing a lithium-ion secondary battery using the structure 10 for a lithium-ion secondary battery will be described with reference to FIGS. 8 to 11. Note that FIG. 8 is a flowchart for explaining the method for manufacturing a lithium-ion secondary battery. FIGS. 9 to 11 are plan views for explaining the method for manufacturing a lithium-ion secondary battery.

[0092] First, in the unsealing step of step S10, an opening communicating with the electrolyte introduction portion 51B is formed in the laminate film 50. In the present embodiment, as shown in FIG. 9(a), the laminate film 50 is cut at the position indicated by the broken line V so as to separate the welded portion at the end on the side opposite to the storage chamber 51A of the electrolyte introduction portion 51B, thereby forming the opening 55. That is, in the present embodiment, the opening 55 is provided so as to extend in the X direction at the end on the side opposite to the storage chamber 51A in the Y direction of the laminate film 50. Of course, the opening 55 is not particularly limited thereto, and for example, an opening may be formed only in a part of the X direction. That is, the opening 55 may be formed by cutting a corner portion of the laminate film.

[0093] This unsealing step is preferably performed in a low humidity environment. By performing the unsealing step in a low humidity environment, moisture will not be taken into the internal space 51 after unsealing. Also in this unsealing step, when the internal space 51 is filled with an inert gas as described above, it may be performed in an inert gas atmosphere, and the subsequent injection step and sealing step may be performed in an inert atmosphere.

[0094] Next, in the injection step of step S11, as shown in FIG. 9(b), an electrolytic solution T, which is an electrolyte, is injected from the opening 55 into the internal space 51 of the laminate film 50. The electrolytic solution T is injected in an amount necessary to impregnate the electrode assembly 20. The electrolytic solution T thus injected into the internal space 51 of the laminate film 50 from the opening 55 is temporarily held in the electrolyte introduction portion 51B. This injection step is also preferably performed in a low humidity environment. By performing the injection step in a low humidity environment in this way, it is possible to suppress the incorporation of moisture into the electrolytic solution T and suppress the deterioration of battery performance.

[0095] Here, the electrolytic solution T used in factory Y is transported separately from the lithium ion secondary battery structure 10 from factory X to factory Y. If the electrolytic solution T to be injected from factory X is sent, it is possible to reduce the injection of an electrolytic solution having a composition different from the electrolytic solution T that should originally be injected. However, if care is taken not to make such a mistake, of course, the procurement of the electrolytic solution T used in factory Y is not particularly limited to this. For example, if the same electrolytic solution T as that to be injected into the lithium ion secondary battery structure 10 is procured directly from an electrolytic solution manufacturer near factory Y, factory Y can prepare the necessary electrolytic solution T without restrictions on the transportation of the electrolytic solution T, which is preferable. In particular, when factory X and factory Y are in different countries, it is preferable to procure the necessary electrolytic solution T within the country where factory Y is located. Further, when factory X and factory Y are different companies, the company owning factory Y that purchased the lithium ion secondary battery structure 10 may be able to procure the electrolytic solution T to be injected into the lithium ion secondary battery structure 10 at a low cost through its own route, which is preferable.

[0096] Next, in the impregnation step of step S12, as shown in FIG. 10(a), the electrolytic solution T held in the electrolyte introduction portion 51B is impregnated into the electrode assembly 20 in the accommodation chamber 51A. Hereinafter, the electrode assembly 20 impregnated with the electrolytic solution T is denoted as the electrode assembly 20A. In this impregnation step, the rate at which the electrolytic solution T impregnates the electrode assembly 20 varies depending on the structure and material of the electrode assembly 20. As an example, the time required in the impregnation step is about several minutes to several tens of minutes.

[0097] In this way, by temporarily holding the electrolytic solution T to be impregnated into the electrode assembly 20 in the electrolyte introduction portion 51B, it is not necessary to continuously inject the electrolytic solution T while replenishing it from the opening 55 until the impregnation of the electrolytic solution T into the electrode assembly 20 is completed. Therefore, complicated processes are not required in the injection process and the impregnation process. Further, before the impregnation of the electrolytic solution T into the electrode assembly 20 is completed, the unsealing process and the injection process can be repeatedly performed on the next lithium ion secondary battery structure 10, and the impregnation process of the lithium ion secondary battery structure 10 into which the electrolytic solution T has been injected can be performed simultaneously. Therefore, the efficiency of the manufacturing process can be improved, and the productivity can be enhanced.

[0098] Note that it is also preferable to perform this impregnation process in a low humidity environment. By performing the impregnation process in a low humidity environment, it is possible to suppress the intrusion of outside air containing moisture into the internal space 51 of the exterior member 50 from the opening 55, and suppress the intake of moisture into the electrolytic solution T.

[0099] Next, a preliminary charging (formation charging) process of step S13 is performed. That is, preliminary charging (formation charging) of the lithium ion secondary battery structure 10 having the electrode assembly 20 impregnated with the electrolytic solution T is performed. At this time, since the opening 55 is not yet sealed, the gas generated during the preliminary charging is discharged to the outside from the opening 55. Note that in the preliminary charging, the gas generated in the internal space 51 may be discharged to the outside by suction with a degassing device.

[0100] Note that depending on the structure and material of the electrode assembly 20, the material of the electrolytic solution T, etc., no gas may be generated during the preliminary charging, or the generated gas may be extremely small. In such a case where no gas is generated or the generated gas is extremely small during the preliminary charging, a sealing process described later may be performed before the preliminary charging. Of course, when performing the sealing process before the preliminary charging, the cutting process described later may be performed simultaneously with the sealing process, that is, before the preliminary charging.

[0101] Next, in the sealing step of step S14, at least a part of the electrolyte introduction portion 51B is blocked to seal the accommodation chamber 51A. In the sealing step of the present embodiment, as shown in FIG. 10(b), while sufficiently degassing the internal space 51 in a low humidity environment, a region 52 for blocking the laminate film 50, that is, a part of the electrolyte introduction portion 51B is blocked by welding or the like to form a bonding region 53, and the accommodation chamber 51A is sealed. In the present embodiment, since the region 52 (bonding region 53) is provided at the boundary portion on the accommodation chamber 51A side of the electrolyte introduction portion 51B, only the accommodation chamber 51A is sealed by forming the bonding region 53. That is, the accommodation chamber 51A in which the electrode assembly 20A is accommodated and the electrolyte introduction portion 51B side provided with the opening 55 are partitioned without communicating with each other. Further, the region 52 of the laminate film 50 in the present embodiment was welded and blocked by ultrasonic welding.

[0102] In the sealing step of the present embodiment, the region 52 on the boundary side of the electrolyte introduction portion 51B with the accommodation chamber 51A is blocked, but it is not particularly limited thereto, and the end side provided with the opening 55 may be blocked, or all regions of the electrolyte introduction portion 51B may be blocked.

[0103] Next, in the cutting step of step S15, as shown in FIG. 11, an extra portion is separated by cutting the laminate film 50 at the position indicated by the broken line W. Thereby, a lithium ion secondary battery with a relatively small size can be manufactured. In the cutting step of the present embodiment, cutting is performed so as to divide the joining region 53 so that the state where the accommodation chamber 51A is sealed is maintained. That is, at least a part of the joining region 53 is in a state of closing the side of the accommodation chamber 51A, that is, in a state where a part of the joining region 53 remains on the side of the electrode assembly 20A, and the other part is cut so as to be separated. Thereby, a lithium ion secondary battery can be manufactured with the accommodation chamber 51A sealed by the joining region 53. In the present embodiment, cutting is performed so as to divide the joining region 53, but it is not particularly limited thereto, and the portion other than the joining region 53 of the region 52 may be cut so that all of the joining region 53 remains on the side of the electrode assembly 20A. Further, cutting may be performed on a portion other than the region 52 of the electrolyte introduction portion 51B. Incidentally, the cutting step may be performed in a low humidity environment, or may not be performed in a low humidity environment.

[0104] Further, in the present embodiment, by performing the cutting step, an extra region of the laminate film 50 is cut off, but it is not particularly limited thereto, and the electrolyte introduction portion 51B may remain in the laminate film 50 without performing the cutting step, and it may be a lithium ion secondary battery. Further, when the electrolyte introduction portion 51B remains in the laminate film 50 and it is a lithium ion secondary battery, the sealing step may be performed so as to close the end side where the opening 55 of the electrolyte introduction portion 51B of the laminate film 50 is provided. That is, even in a state where the electrolyte introduction portion 51B and the accommodation chamber 51A communicate with each other, the electrolyte T of the electrode assembly 20A impregnated with the electrolyte T does not enter the electrolyte introduction portion 51B side, so there is no particular problem. However, by providing the joining region 53 at the boundary portion between the electrolyte introduction portion 51B and the accommodation chamber 51A, the electrode assembly 20A does not move in the accommodation chamber 51A, and twisting and breakage of the exterior member 50 can be suppressed.

[0105] After that, in the charge and discharge inspection step of step S16, through inspections such as charge and discharge inspections, those that meet predetermined criteria are shipped as lithium-ion secondary batteries.

[0106] In the manufacturing process of such lithium-ion secondary batteries, as described above, the steps from step S10 to step S14, that is, the unsealing step, the injection step, and the sealing step, are performed in a low humidity environment. Incidentally, the low humidity environment is, for example, a highly dry state where the dew point temperature is -20°C or lower. That is, it is maintained in an environment such as a low humidity gas atmosphere, a vacuum state, or an inert gas atmosphere.

[0107] By performing the unsealing step, the injection step, and the sealing step of the laminate film 50 in such a low humidity environment, it is possible to suppress the entry of gases with uncontrolled humidity, such as outside air, into the accommodation chamber 51A, and seal the inside of the accommodation chamber 51A in a low humidity state. Therefore, it is possible to suppress the deterioration of the electrode active material layer of the electrode assembly 20 and the injected electrolyte T due to moisture, and obtain desired battery performance when it becomes a lithium-ion secondary battery.

[0108] Then, by transporting the lithium-ion secondary battery structure 10 in which the electrolyte T has not been injected and the internal space 51 is in a low humidity state from factory X to factory Y, it can be safely transported without the transport volume being restricted in air transportation or the like. Therefore, compared with the case of transporting a lithium-ion secondary battery with the electrolyte T injected from factory X to factory Y, it can be safely transported in a shorter number of transport days using air transportation or the like.

[0109] Also, by providing the electrolyte introduction part 51B in the structure 10 for a lithium-ion secondary battery as described above, the opening process and the injection process are repeated to manufacture a plurality of structures 10 for a lithium-ion secondary battery into which the electrolytic solution T is injected. Then, an impregnation process is performed on the plurality of structures 10 for a lithium-ion secondary battery into which the electrolytic solution T is injected. That is, while the impregnation process of one structure 10 for a lithium-ion secondary battery is being performed, the liquid injection process of another structure 10 for a lithium-ion secondary battery can be performed, so that the manufacturing time can be shortened. And the impregnation processes of two or more structures 10 for a lithium-ion secondary battery can be performed in parallel. Since the impregnation process that requires a long time can be performed in parallel with a plurality of structures 10 for a lithium-ion secondary battery in this way, the working efficiency can be improved. After that, the working efficiency can be improved by continuously performing a sealing process on the plurality of structures 10 for a lithium-ion secondary battery for which the impregnation process has been completed.

[0110] As described above, in the structure 10 for a lithium-ion secondary battery which is the structure for a non-aqueous electrolyte secondary battery of the present embodiment, the electrode assembly 20, the laminate film 50 which is an exterior member made of a film for sealing the electrode assembly 20, and the tab lead 40 which penetrates the laminate film 50 from the inside to the outside and is connected to the electrode assembly 20 are provided. The laminate film 50 includes a storage chamber 51A in which the electrode assembly 20 is stored and an electrolyte introduction part 51B communicating with the storage chamber 51A. The laminate film 50 is sealed without injecting the electrolytic solution T which is an electrolyte inside.

[0111] In this way, since the electrolytic solution T is not injected into the structure 10 for a lithium-ion secondary battery, the transport volume due to the electrolytic solution T is not restricted in air transportation or the like, and transportation can be performed by any transportation means including air transportation and marine transportation using a ship, and transportation can be performed safely and in a short time.

[0112] Also, after transporting the structure 10 for a lithium ion secondary battery, by simply injecting the electrolytic solution T into the electrolyte introduction part 51B of the structure 10 for a lithium ion secondary battery, a lithium ion secondary battery, which is a non-aqueous electrolyte secondary battery, can be easily manufactured.

[0113] Further, in the structure 10 for a lithium ion secondary battery of the present embodiment, it is preferable that the laminate film 50, which is an exterior member, is joined and sealed continuously over the entire circumference of the outer periphery of the electrode assembly 20. According to this, it is easy to seal the laminate film 50, and when manufacturing a lithium ion secondary battery by injecting the electrolytic solution T, which is an electrolyte, into the laminate film 50, an opening for injecting the electrolytic solution T into the laminate film 50 can be easily formed.

[0114] Further, in the structure for a lithium ion secondary battery of the present embodiment, it is preferable that the electrolyte introduction part 51B has a height h2 that is equal to or greater than the height h1 of the accommodation chamber 51A in the Y direction, which is the arrangement direction of the accommodation chamber 51A and the electrolyte introduction part 51B. By setting the height h2 of the electrolyte introduction part 51B to be equal to or greater than the height h1 of the accommodation chamber 51A in this way, when injecting the electrolytic solution T into the electrolyte introduction part 51B, all of the electrolytic solution T to be impregnated into the electrode assembly 20 can be retained in the electrolyte introduction part 51B, eliminating the need to repeat the injection of the electrolytic solution T and improving the working efficiency.

[0115] Further, in the structure for a lithium ion secondary battery of the present embodiment, for the tab lead 40, which is an external electrode terminal, it is preferable that the other end, which is opposite to the one end joined to the electrode assembly 20, extends in the Y direction, which is the arrangement direction of the accommodation chamber 51A and the electrolyte introduction part 51B, toward the side opposite to the electrolyte introduction part 51B. By extending the tab lead 40 in this way toward the side opposite to the electrolyte introduction part 51B, when manufacturing a lithium ion secondary battery by blocking a part on the accommodation chamber 51A side of the electrolyte introduction part 51B, the tab lead 40 does not get in the way and can be easily blocked.

[0116] In addition, in the structure for a lithium - ion secondary battery of the present embodiment, it is preferable that the laminate film 50, which is an exterior member, has its interior sealed in a low - humidity state. By sealing the interior of the laminate film 50 in such a low - humidity state, the interior of the exterior member into which the electrolytic solution T has not been injected is sealed in a low - humidity state. As a result, in air transportation or marine transportation using a ship, etc., there is no transportation restriction caused by the electrolytic solution T. Thus, transportation can be carried out by any means of transportation including air transportation and marine transportation using a ship, and transportation can be carried out safely and in a short time. Further, after the transportation of the structure 10 for a lithium - ion secondary battery, a lithium - ion secondary battery can be easily manufactured by injecting the electrolytic solution T into the interior of the structure 10 for a lithium - ion secondary battery.

[0117] In addition, the package 100 of the present embodiment includes the structure 10 for a lithium - ion secondary battery, which is the structure for a non - aqueous electrolyte secondary battery described above.

[0118] In this way, by packaging the structure 10 for a lithium - ion secondary battery in which the electrolytic solution T has not been injected into the internal space 51 for transportation, the package 100 can be transported by any means of transportation including air transportation and marine transportation using a ship without the transportation volume being restricted due to the electrolytic solution T, and transportation can be carried out safely and in a short time.

[0119] In addition, the lithium - ion secondary battery, which is a non - aqueous electrolyte secondary battery of the present embodiment, includes the structure 10 for a lithium - ion secondary battery, which is the structure for a non - aqueous electrolyte secondary battery described above. At least a part of the electrolyte introduction part 51B of the laminate film 50, which is an exterior member, is blocked and the accommodation chamber 51A is sealed, and the accommodation chamber 51A is filled with the electrolytic solution T, which is an electrolyte.

[0120] By sealing the accommodation chamber 51A in this way, the amount of the electrolytic solution T filled in the accommodation chamber 51A can be reduced. Further, the lithium - ion secondary battery can be used without cutting off the extra area of the electrolyte introduction part 51B of the laminate film 50.

[0121] Further, in the lithium-ion secondary battery of the present embodiment, it is preferable that the electrolyte introduction portion 51B of the laminate film 50, which is an exterior member, is removed leaving a portion that seals the accommodation chamber 51A. According to this, by removing the unnecessary electrolyte introduction portion 51B, the lithium-ion secondary battery can be made smaller than when all of the electrolyte introduction portion 51B is left, or it can be made the same size as before, so that the housing for accommodating the lithium-ion secondary battery can be used as it is.

[0122] Furthermore, in the manufacturing method of the lithium-ion secondary battery structural body, which is the non-aqueous electrolyte secondary battery structural body of the present embodiment, it includes an electrode assembly 20, a laminate film 50 which is an exterior member made of a film for sealing the electrode assembly 20, and a tab lead 40 which penetrates the laminate film 50 from the inside to the outside and is an external electrode terminal connected to the electrode assembly 20. The laminate film 50 includes an accommodation chamber 51A for accommodating the electrode assembly 20 inside and an electrolyte introduction portion 51B communicating with the accommodation chamber 51A. The electrode assembly 20 is accommodated in the accommodation chamber 51A without injecting the electrolytic solution T, which is an electrolyte, inside the laminate film 50, and the inside of the laminate film 50 is sealed.

[0123] By such a manufacturing method, the lithium-ion secondary battery structural body 10 in which the electrolytic solution T is not injected inside the laminate film 50 and is sealed can be easily manufactured.

[0124] Also, in the manufacturing method of the lithium-ion secondary battery structural body 10 of the present embodiment, in the step of sealing the laminate film 50, it is preferable to perform it in a low humidity environment. By sealing the laminate film 50 in such a low humidity environment, the inside of the laminate film 50 can be maintained in a low humidity state, and deterioration of the electrode active material layer of the electrode assembly inside the laminate film 50 due to moisture can be suppressed. Also, when injecting the electrolytic solution T into the laminate film 50, deterioration of the electrolytic solution T due to moisture inside the laminate film 50 can be suppressed.

[0125] Further, in the method for manufacturing a lithium-ion secondary battery which is a non-aqueous electrolyte secondary battery of the present embodiment, an electrode assembly 20, a laminate film 50 which is an exterior member made of a film for sealing the electrode assembly 20, and a tab lead 40 which is an external electrode terminal penetrating the laminate film 50 from the inside to the outside and connected to the electrode assembly 20 are provided. The laminate film 50 includes a housing chamber 51A for housing the electrode assembly 20 therein and an electrolyte introduction portion 51B communicating with the housing chamber 51A. The laminate film 50 uses a lithium-ion secondary battery structure 10 which is a non-aqueous electrolyte secondary battery structure sealed without injecting an electrolytic solution T which is an electrolyte therein, and includes an unsealing step of forming an opening 55 communicating with the electrolyte introduction portion 51B in the laminate film 50, an injection step of injecting the electrolytic solution T which is an electrolyte into the electrolyte introduction portion 51B from the opening 55, an impregnation step of impregnating the electrode assembly 20 housed in the housing chamber 51A with the electrolytic solution injected into the electrolyte introduction portion 51B, and a sealing step of closing at least a part of the electrolyte introduction portion 51B to seal the inside.

[0126] In such a method for manufacturing a lithium-ion secondary battery, a lithium-ion secondary battery can be easily manufactured by simply providing an opening 55 in the laminate film 50 and injecting the electrolytic solution T. Further, since the injected electrolytic solution T can be temporarily held in the electrolyte introduction portion 51B, in the impregnation step, the electrolytic solution T held in the electrolyte introduction portion 51B can be impregnated into the electrode assembly 20. Therefore, it is not necessary to add the electrolytic solution T from the opening 55 while impregnating until the impregnation is completed, and a complicated process becomes unnecessary. Further, before the impregnation is completed, the unsealing step and the injection step can be performed on the next lithium-ion secondary battery structure 10, so that the manufacturing process can be made efficient and the productivity can be improved.

[0127] Further, in the method for manufacturing a lithium ion secondary battery according to the present embodiment, after the impregnation step, a preliminary charging step for performing preliminary charging is further provided, and the sealing step is preferably performed after the preliminary charging step. In this way, by performing the preliminary charging step before the sealing step, the gas generated in the preliminary charging step can be discharged to the outside from the opening 55.

[0128] Further, in the method for manufacturing a lithium ion secondary battery according to the present embodiment, in the sealing step, it is preferable to close at least the boundary portion on the accommodation chamber 51A side of the electrolyte introduction portion 51B. By closing the boundary portion on the accommodation chamber 51A side of the electrolyte introduction portion 51B in this way, the movement of the electrode assembly 20 in the accommodation chamber 51A can be suppressed.

[0129] Further, in the method for manufacturing a lithium ion secondary battery according to the present embodiment, after the sealing step, it is preferable to further include a cutting step of cutting the opening 55 side of the electrolyte introduction portion 51B in a state where the accommodation chamber 51A is sealed. By performing the cutting step in this way, an extra region can be cut off, and a relatively small lithium ion secondary battery can be manufactured.

[0130] Further, in the method for manufacturing a lithium-ion secondary battery according to the present embodiment, while performing an impregnation process on the lithium-ion secondary battery structure 10 which is a structure for a non-aqueous electrolyte secondary battery into which the electrolytic solution T is injected in the injection process, it is preferable to perform an injection process on the lithium-ion secondary battery structure 10 which is another structure for a non-aqueous electrolyte secondary battery. According to this, since the injection process can be performed on the next lithium-ion secondary battery structure before the impregnation process is completed, the manufacturing efficiency can be improved and the productivity can be improved. That is, while performing one process selected from the unsealing process, the injection process, and the impregnation process on the lithium-ion secondary battery structure 10 which is a structure for a non-aqueous electrolyte secondary battery, on the lithium-ion secondary battery structure 10 which is another structure for a non-aqueous electrolyte secondary battery, by performing a process different from the process being performed on one lithium-ion secondary battery structure 10, it is not necessary to perform the same process at the same time, and the manufacturing efficiency can be improved and the cost can be reduced. Further, for example, by performing different processes in parallel from among the three processes of the unsealing process, the injection process, and the impregnation process on each of the three lithium-ion secondary battery structures 10 which are structures for a non-aqueous electrolyte secondary battery, the manufacturing efficiency can be improved. Also, although the impregnation process takes time until impregnation is completed, by performing the impregnation processes of a plurality of lithium-ion secondary battery structures 10 in parallel, it can be performed in a shorter time compared to the case of performing the impregnation process individually, so the working efficiency can be improved and the cost can be reduced.

[0131] (Embodiment 2) FIG. 12 is a flowchart for explaining a method for manufacturing a lithium-ion secondary battery according to Embodiment 2 of the present invention. FIGS. 13 to 15 are plan views for explaining the method for manufacturing a lithium-ion secondary battery according to Embodiment 2. Note that the same members as those in the above-described embodiment are denoted by the same reference numerals and redundant explanations are omitted.

[0132] As shown in FIG. 12, the unsealing process in step S20 and the injection process in step S21 are performed. Since these steps S20 and S21 are the same as those in Embodiment 1 described above, redundant explanations are omitted.

[0133] Next, in the sealing step of step S22, at least a part of the electrolyte introduction portion 51B is blocked to seal the inside. In the sealing step of the present embodiment, as shown in Fig. 13(a), while sufficiently degassing the internal space 51 in a low humidity environment, the opening 55 formed in the opening step of step S20 is blocked. That is, the end portion of the electrolyte introduction portion 51B on the side opposite to the storage chamber 51A in the Y direction is sealed. Thereby, the internal space 51 of the laminate film 50 is sealed in a state where the electrolytic solution T is injected. Note that the sealing of the opening of the laminate film 50 in the present embodiment is performed by welding the laminate film 50.

[0134] Next, the impregnation step of step S23 is performed. That is, the sealing step of the present embodiment is performed between the injection step and the impregnation step. In the impregnation step of the present embodiment, as shown in Fig. 13(b), since the opening of the laminate film 50 is sealed, it is difficult for moisture to enter from the outside. Therefore, it is not necessary to perform the impregnation step in a low humidity environment. For this reason, the time-consuming impregnation step can be performed outside the apparatus for maintaining the low humidity environment, and the apparatus for maintaining the low humidity environment can be efficiently used in the next opening step and liquid injection step, shortening the manufacturing time and improving the productivity. Further, in the impregnation step of the present embodiment, since the opening 55 of the laminate film 50 is sealed, leakage of the electrolytic solution T to the outside can also be suppressed. Therefore, the posture of the structure 10 for a lithium ion secondary battery when performing the impregnation step is not restricted, and handling can be easily performed. That is, in the present embodiment, after the sealing step, it is not necessary to maintain the posture such that the opening 55 faces vertically upward. Note that the electrode assembly 20 impregnated with the electrolytic solution T is hereinafter referred to as the electrode assembly 20A.

[0135] Next, a preliminary charging (formation charging) step of step S24 is performed. That is, preliminary charging (formation charging) of the lithium-ion secondary battery structure 10 having the electrode assembly 20A impregnated with the electrolytic solution T is performed. At this time, since the opening 55 of the laminate film 50 is sealed, as shown in FIG. 14(a), the gas G generated during the preliminary charging is held inside the electrolyte introduction portion 51B and is not discharged to the outside. Further, since the preliminary charging step of the present embodiment is performed after the sealing step, it is not necessary to perform it in a low humidity environment, and the posture of the lithium-ion secondary battery structure 10 is not restricted either.

[0136] Next, a partitioning step is performed in step S25. In the partitioning step of the present embodiment, as shown in FIG. 14(b), an area 52 for closing the laminate film 50, that is, a part of the electrolyte introduction portion 51B is closed by welding or the like to form a joining region 53, and the accommodation chamber 51A is sealed. Further, by forming the joining region 53, the electrolyte introduction portion 51B in which the gas G generated during the preliminary charging is held is also sealed. However, since the gas G is held in the electrolyte introduction portion 51B, when forming the joining region 53 in the partitioning step, there is a possibility that the adhesive force in the joining region 53 may decrease as compared with the first embodiment. That is, by performing preliminary charging while discharging the gas G from the opening 55 to the outside as in the above-described first embodiment, the gas G generated during the preliminary charging does not interfere when forming the joining region 53 in the sealing step, and it is possible to suppress a decrease in the adhesive force of the joining region 53.

[0137] Next, a cutting step is performed in step S26. In the cutting step of the present embodiment, as shown in FIG. 15(a), the lithium-ion secondary battery is manufactured by cutting the laminate film 50 at the position indicated by the broken line W so as to divide the joining region 53. That is, as shown in FIG. 15(b), the electrolyte introduction portion 51B holding the gas G generated during the preliminary charging can be separated without the gas G leaking to the outside. For this reason, it is possible to suppress the occurrence of fire and corrosion of the device due to the gas G generated during the preliminary charging leaking to the outside, and to improve safety.

[0138] After that, in step S27, in the charge / discharge inspection process, through inspections such as charge / discharge inspections, those that meet predetermined criteria are shipped as lithium-ion secondary batteries.

[0139] Of course, depending on the structure and materials of the electrode assembly 20 and the materials of the electrolyte T, gas G may not be generated in the preliminary charging process, or the generation of gas G may be very small. In such a case where gas G is not generated or the generation of gas G is very small in the preliminary charging process, it may be used as a lithium-ion secondary battery without performing the partitioning process and the cutting process, or it may be used as a lithium-ion secondary battery by performing the partitioning process without performing the cutting process.

[0140] Also, in this embodiment, the sealing process is performed before the impregnation process, but it is not particularly limited thereto, and the sealing process may be performed after the impregnation process and before the preliminary charging process. However, as described above, performing the sealing process before the impregnation process enables the time-consuming impregnation process to be performed outside the device that maintains a low humidity environment, so that the manufacturing time can be shortened and the productivity can be improved.

[0141] As described above, in the method for manufacturing a lithium-ion secondary battery, which is a non-aqueous electrolyte secondary battery according to this embodiment, it includes an electrode assembly 20, a laminate film 50 which is an exterior member made of a film for sealing the electrode assembly 20, and a tab lead 40 which is an external electrode terminal that penetrates the laminate film 50 from the inside to the outside and is connected to the electrode assembly 20. The laminate film 50 includes a housing chamber 51A for housing the electrode assembly 20 therein and an electrolyte introduction portion 51B communicating with the housing chamber 51A. The laminate film 50 uses a lithium-ion secondary battery structure 10 which is a non-aqueous electrolyte secondary battery structure sealed without injecting the electrolyte T therein. It includes an unsealing process of forming an opening 55 communicating with the electrolyte introduction portion 51B in the laminate film 50, an injection process of injecting the electrolyte T, which is the electrolyte, into the electrolyte introduction portion 51B through the opening 55, an impregnation process of impregnating the electrode assembly 20 housed in the housing chamber 51A with the electrolyte T injected into the electrolyte introduction portion 51B, and a sealing process of closing the inside by closing at least a part of the electrolyte introduction portion 51B.

[0142] In such a method for manufacturing a lithium-ion secondary battery, an opening 55 is provided in the laminate film 50, and the lithium-ion secondary battery can be easily manufactured simply by injecting the electrolytic solution T. Further, since the injected electrolytic solution T can be temporarily held in the electrolyte introduction portion 51B, in the impregnation step, the electrolytic solution T held in the electrolyte introduction portion 51B can be impregnated into the electrode assembly 20. Therefore, it is not necessary to continuously add the electrolytic solution T from the opening 55 until the impregnation is completed, and a complicated process is unnecessary. Further, before the impregnation is completed, since the unsealing step and the injection step can be performed on the next lithium-ion secondary battery structure 10, the manufacturing process can be made more efficient and the productivity can be improved.

[0143] Further, in the method for manufacturing a lithium-ion secondary battery of the present embodiment, the sealing step is preferably performed between the injection step and the impregnation step, and in the sealing step, it is preferable to close the opening 55 side formed in the unsealing step. By performing the sealing step before the impregnation step in this way, since the opening 55 is closed in the impregnation step, it is possible to suppress the leakage of the electrolytic solution T from the opening 55, and the posture of the lithium-ion secondary battery structure is not restricted.

[0144] Further, in the method for manufacturing a lithium-ion secondary battery of the present embodiment, after the impregnation step, it is preferable to further include a preliminary charging step for performing preliminary charging, and after the preliminary charging step, a partitioning step for closing at least a part of the electrolyte introduction portion 51B to seal the accommodation chamber 51A. In this way, by performing preliminary charging after the sealing step, it is possible to suppress the gas generated by the preliminary charging from being discharged to the outside. Further, the gas generated by the preliminary charging can be sealed in the electrolyte introduction portion 51B in the partitioning step.

[0145] Further, in the method for manufacturing a lithium-ion secondary battery according to the present embodiment, it is preferable to further include a cutting step of cutting the opening 55 side of the electrolyte introduction portion 51B in a state where the accommodation chamber 51A is sealed after the partitioning step. By performing the cutting step in this way, an extra area of the laminate film 50 can be cut off, and a relatively small lithium-ion secondary battery can be manufactured. Further, the gas G sealed in the electrolyte introduction portion 51B by the partitioning step can be separated from the lithium-ion secondary battery without being discharged to the outside, and the safety can be improved.

[0146] Further, in the method for manufacturing a lithium-ion secondary battery according to the present embodiment, for the lithium-ion secondary battery structure 10, which is a plurality of non-aqueous electrolyte secondary battery structures sealed without injecting the electrolyte solution T, which is an electrolyte, into the laminate film 50, which is an exterior member, the unsealing step and the injection step are repeatedly performed to manufacture the lithium-ion secondary battery structure 10, which is a plurality of non-aqueous electrolyte secondary battery structures into which the electrolyte solution T has been injected, and it is preferable to simultaneously perform an impregnation step on the plurality of lithium-ion secondary battery structures 10 into which the electrolyte solution T has been injected. According to this, since the unsealing step and the injection step can be performed on the next lithium-ion secondary battery structure before the impregnation step is completed, the manufacturing efficiency can be improved and the productivity can be improved.

[0147] (Other embodiments) As described above, each embodiment of the present invention has been described, but the basic configuration of the present invention is not limited to the above-described ones.

[0148] For example, in the above-described Embodiments 1 and 2, the lithium-ion secondary battery structure 10 was exemplified as a package 100 in which a plurality of structures were packaged so as to be transportable, but it is not particularly limited thereto, and the lithium-ion secondary battery structures 10 may each be individually packaged.

[0149] Also, in the above-described Embodiments 1 and 2, the electrolyte solution T was exemplified as the electrolyte, but the electrolyte may be a so-called jelly-like one.

[0150] Also, in the above-described Embodiments 1 and 2, the pre-charging step was performed, but the present invention is not particularly limited thereto, and it may be shipped as a lithium-ion secondary battery without performing the pre-charging step.

[0151] Furthermore, in each of the above-described embodiments, a structure for a lithium-ion secondary battery using a lithium metal oxide as an electrode active material, a method for manufacturing the same, a package, a lithium-ion secondary battery, and a method for manufacturing the same were exemplified. However, the present invention is not limited to those using a lithium metal oxide as an electrode active material, and can be applied to a structure for a non-aqueous electrolyte secondary battery using an electrode active material other than a lithium metal oxide, a method for manufacturing the same, a package, a non-aqueous electrolyte secondary battery, and a method for manufacturing the same.

Explanation of Reference Numerals

[0152] 10... Structure for lithium-ion secondary battery (structure for non-aqueous electrolyte secondary battery), 20... Electrode assembly, 21... Positive electrode plate, 22... Negative electrode plate, 23... Separator, 24... Positive electrode side connection portion, 25... Negative electrode side connection portion, 30... Clip, 40... Tab lead (external electrode terminal), 50... Laminate film (outer packaging member), 51... Internal space, 51A... Accommodation chamber, 51B... Electrolyte introduction portion, 52... Region, 53... Bonding region, 55... Opening, 100... Package, 101... Packaging case, A, B... Factories, G... Gas, T... Electrolyte

Claims

1. an electrode assembly; an exterior member made of a film that seals the electrode assembly; a pair of external electrode terminals that penetrate the exterior member from the inside to the outside, have bent portions, have one end connected to the electrode assembly, and have the other end extending to the outside; Equipped with the exterior member includes a storage chamber in which the electrode assembly is stored, and an electrolyte introduction portion that communicates with the storage chamber and that supplies an electrolyte into the storage chamber, The interior of the exterior member is sealed in a deaerated, low-humidity state without containing an electrolyte, the pair of external electrode terminals extend from opposing sides of the exterior member, the electrolyte introduction section is disposed alongside the storage chamber on a side different from a side along which the external electrode terminal extends to the outside, the other ends of the pair of external electrode terminals extend toward a side opposite the electrolyte introduction portion in an arrangement direction of the storage chamber and the electrolyte introduction portion.

2. an electrode assembly; an exterior member made of a film that seals the electrode assembly; a pair of external electrode terminals that penetrate the exterior member from the inside to the outside, have bent portions, have one end connected to the electrode assembly, and have the other end extending to the outside; Equipped with the exterior member includes a storage chamber in which the electrode assembly is stored, and an electrolyte introduction portion that communicates with the storage chamber and that supplies an electrolyte into the storage chamber, The interior of the exterior member is filled with an inert gas without containing an electrolyte and is sealed in a low humidity state, the pair of external electrode terminals extend from opposing sides of the exterior member, the electrolyte introduction section is disposed alongside the storage chamber on a side different from a side along which the external electrode terminal extends to the outside, the other ends of the pair of external electrode terminals extend toward a side opposite the electrolyte introduction portion in an arrangement direction of the storage chamber and the electrolyte introduction portion.

3. 3. The nonaqueous electrolyte secondary battery structure according to claim 1, wherein the exterior member does not bond the storage chamber and the electrolyte introduction portion, but bonds an end of the electrolyte introduction portion on a side where the storage chamber is not disposed.

4. The electrolyte introduction part has a height equal to or greater than the height of the storage chamber in the arrangement direction of the storage chamber and the electrolyte introduction part, and has a volume capable of holding an amount of electrolyte necessary for impregnating the electrode assembly. The non-aqueous electrolyte secondary battery structure according to any one of claims 1 to 3.

5. In the electrolyte introduction part, the opposing films are in contact with each other. The non-aqueous electrolyte secondary battery structure according to any one of claims 1 to 4.

6. An electrode assembly, An exterior member made of a film that seals the electrode assembly, A pair of external electrode terminals that penetrate the exterior member from the inside to the outside, have a bent portion, one end is connected to the electrode assembly, and the other end extends to the outside, Comprising, The pair of external electrode terminals extend from opposite sides of the exterior member, The exterior member includes a storage chamber for storing the electrode assembly therein and an electrolyte introduction part communicating with the storage chamber for sending electrolyte into the storage chamber. The electrolyte introduction part is arranged side by side with the storage chamber on a side different from the side where the external electrode terminals extend to the outside. The other end of the pair of external electrode terminals extends toward the side opposite to the electrolyte introduction part in the arrangement direction of the storage chamber and the electrolyte introduction part. A method for manufacturing a non-aqueous electrolyte secondary battery structure, Characterized in that the electrode assembly is housed in the storage chamber, and the inside of the exterior member is degassed without injecting electrolyte into both the storage chamber and the electrolyte introduction part, and the opening on the outer periphery of the exterior member is sealed and hermetically sealed in a low humidity state. A method for manufacturing a non-aqueous electrolyte secondary battery structure.

7. An electrode assembly, An exterior member made of a film that seals the electrode assembly, A pair of external electrode terminals that penetrate the exterior member from the inside to the outside, have a bent portion, one end is connected to the electrode assembly, and the other end extends to the outside, Comprising, The pair of external electrode terminals extend from opposite sides of the exterior member, The exterior member includes an accommodation chamber for accommodating the electrode assembly therein, and an electrolyte introduction portion communicating with the accommodation chamber for sending an electrolyte into the accommodation chamber. The electrolyte introduction portion is arranged side by side with the accommodation chamber on a side different from the side where the external electrode terminal extends to the outside. The pair of external electrode terminals has the other end extending toward the side opposite to the electrolyte introduction portion in the arrangement direction of the accommodation chamber and the electrolyte introduction portion. A method for manufacturing a non-aqueous electrolyte secondary battery structure, characterized in that the electrode assembly is accommodated in the accommodation chamber, and without injecting an electrolyte into both the accommodation chamber and the electrolyte introduction portion, an inert gas is filled to seal the opening on the outer periphery of the exterior member with the interior of the exterior member in a low humidity state. A method for manufacturing a non-aqueous electrolyte secondary battery structure.

8. An electrode assembly, An exterior member made of a film for sealing the electrode assembly, A pair of external electrode terminals penetrating the exterior member from the inside to the outside, having a bent portion, one end connected to the electrode assembly, and the other end extending to the outside, comprising, The pair of external electrode terminals extends from opposite sides of the exterior member, respectively, The exterior member includes an accommodation chamber for accommodating the electrode assembly therein, and an electrolyte introduction portion communicating with the accommodation chamber for sending an electrolyte into the accommodation chamber. The electrolyte introduction portion is arranged side by side with the accommodation chamber on a side different from the side where the external electrode terminal extends to the outside. The pair of external electrode terminals has the other end extending toward the side opposite to the electrolyte introduction portion in the arrangement direction of the accommodation chamber and the electrolyte introduction portion. The exterior member evacuates the accommodation chamber with the accommodation chamber and the electrolyte introduction portion communicating with each other without injecting an electrolyte therein, and seals the opening on the outer periphery of the exterior member, so that the interior of the exterior member where the electrode assembly is disposed is sealed in a low humidity state. A method for manufacturing a non-aqueous electrolyte secondary battery using a non-aqueous electrolyte secondary battery structure, An unsealing step of forming an opening communicating with the electrolyte introduction portion in the exterior member, An injection step of injecting an amount of electrolyte necessary for impregnating the electrode assembly into the electrolyte introduction portion from the opening, An impregnation step of impregnating the electrode assembly accommodated in the accommodation chamber with the electrolyte injected into the electrolyte introduction portion, A sealing step of sealing the accommodation chamber by closing at least a part of the electrolyte introduction portion. A method for manufacturing a non-aqueous electrolyte secondary battery, characterized by comprising

9. An electrode assembly, An exterior member made of a film for sealing the electrode assembly, A pair of external electrode terminals that penetrate the exterior member from the inside to the outside, have a bent portion, one end is connected to the electrode assembly, and the other end extends to the outside, Comprising, The pair of external electrode terminals extend from opposite sides of the exterior member, respectively, The exterior member includes an accommodation chamber in which the electrode assembly is accommodated and an electrolyte introduction portion that communicates with the accommodation chamber and is for sending an electrolyte into the accommodation chamber. The electrolyte introduction portion is arranged side by side with the accommodation chamber on a side different from the side where the external electrode terminal extends to the outside. The pair of external electrode terminals have the other end extending in a direction opposite to the electrolyte introduction portion in the arrangement direction of the accommodation chamber and the electrolyte introduction portion. The exterior member fills the accommodation chamber with an inert gas in a state where the accommodation chamber and the electrolyte introduction portion communicate without injecting an electrolyte therein, and seals an opening on the outer periphery of the exterior member, thereby using a structure for a non-aqueous electrolyte secondary battery in which the inside of the exterior member where the electrode assembly is arranged is sealed in a low humidity state. A method for manufacturing a non-aqueous electrolyte secondary battery, An unsealing step of forming an opening in the exterior member that communicates with the electrolyte introduction portion, An injection step of injecting an amount of electrolyte necessary for impregnating the electrode assembly from the opening into the electrolyte introduction portion, An impregnation step of impregnating the electrode assembly accommodated in the accommodation chamber with the electrolyte injected into the electrolyte introduction portion, A sealing step of closing the accommodation chamber by closing at least a part of the electrolyte introduction portion, A method for manufacturing a non-aqueous electrolyte secondary battery, characterized by comprising

10. Further comprising a preliminary charging step of performing preliminary charging after the impregnation step, The sealing step is performed after the preliminary charging step. The method for manufacturing a non-aqueous electrolyte secondary battery according to claim 8 or 9, characterized in that

11. After the sealing step, further comprising a cutting step of cutting the opening side of the electrolyte introduction portion in a state where the accommodation chamber is sealed. The method for manufacturing a non-aqueous electrolyte secondary battery according to any one of claims 8 to 10, characterized in that

12. Performed between the injection step and the impregnation step, A method for manufacturing a non-aqueous electrolyte secondary battery according to any one of claims 8 to 11, characterized by comprising a step of closing the opening side of the electrolyte introduction portion formed in the unsealing step.

13. While performing the impregnation step on one of the structures for non-aqueous electrolyte secondary batteries into which the electrolyte has been injected in the injection step, performing the injection step on the other structures for non-aqueous electrolyte secondary batteries, the method for manufacturing a non-aqueous electrolyte secondary battery according to any one of claims 8 to 12.

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