Method for manufacturing power storage device

Abstract

To provide a technique capable of manufacturing a power storage device with high productivity.SOLUTION: The method for manufacturing the battery 100 disclosed herein includes the case main body preparing step S1 of preparing the rectangular tubular case main body 12 that is open on both sides in the length direction Y. The method also includes an electrode-body preparation step S2 of preparing the electrodes 20 to be housed in the case body 12. The method also includes an insertion step S6 of inserting the electrodes 20 into the case body 12 from one open side 12h of the case body 12.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present disclosure relates to a method for manufacturing an electricity storage device. [Background technology]

[0002] Japanese Patent Application Laid-Open Publication No. 2003-346902 discloses a method for inserting an electrode body for a lithium-ion secondary battery, which includes an electrode body insertion step in which an electrode body is pushed by an electrode body insertion pusher so as to be inserted into the outer can, and the leading end of the electrode body is guided into the outer can by a pair of electrode body guide members provided on a base plate and a gauging pusher facing upward and downward, respectively. Japanese Patent Application Laid-Open Publication No. 2006-100213 also discloses a method for manufacturing a prismatic battery, which includes an electrode body storage step in which the electrode body is pressed down against a cross-linked protective tape, the protective tape is deformed while the electrode body is guided to an opening of the outer can, and the electrode body and the protective tape are inserted into the outer can. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2003-346902 [Patent Document 2] Japanese Patent Application Laid-Open No. 2006-100213 Summary of the Invention [Problem to be solved by the invention]

[0004] Meanwhile, there is a demand for further development of technology that enables electricity storage devices to be manufactured with high productivity. [Means for solving the problem]

[0005] The method for manufacturing an electricity storage device disclosed herein includes a case body preparation step of preparing a rectangular cylindrical case body having openings on both longitudinal sides. It also includes an electrode body preparation step of preparing an electrode body to be housed in the case body. It also includes an insertion step of inserting the electrode body into the case body from one opening of the case body. The case body has a pair of opposing side walls. The electrode body has a pair of side surfaces that face the pair of side walls when housed in the case body. The insertion step includes preparing a pulling member. The pulling member is wrapped around the electrode body so as to align with a rear end of the electrode body in the insertion direction and the pair of side surfaces. With an end of the pulling member positioned forward in the insertion direction, the electrode body is inserted into one opening of the case body. The electrode body is inserted into the case body while pulling the end of the pulling member. A manufacturing method for an electricity storage device having such a configuration enables electricity storage devices to be manufactured with high productivity. [Brief explanation of the drawings]

[0006] [Figure 1] FIG. 1 is a perspective view schematically showing a battery according to one embodiment. [Figure 2] FIG. 2 is a perspective view of the battery of FIG. 1 turned upside down. [Figure 3] FIG. 3 is a vertical cross-sectional view schematically showing the internal structure of the battery of FIG. [Figure 4] FIG. 4 is a perspective view schematically showing an electrode body attached to a lid body. [Figure 5] FIG. 5 is a flowchart illustrating a method for manufacturing a battery according to one embodiment. [Figure 6A] FIG. 6A is a first explanatory diagram for explaining insertion of an electrode body according to one embodiment. [Figure 6B] FIG. 6B is a second explanatory view for explaining insertion of an electrode body according to one embodiment. [Figure 7A] FIG. 7A is a first schematic view showing a state in which a pulling member is hooked onto a claw portion according to one embodiment. [Figure 7B]FIG. 7B is a second schematic view showing a state in which the pulling member is hooked on the claw portion according to one embodiment. [Figure 8A] FIG. 8A is a first schematic view showing a state before a battery according to one embodiment is sealed. [Figure 8B] FIG. 8B is a second schematic view showing the battery according to one embodiment before sealing. [Figure 9A] FIG. 9A is a first schematic diagram showing an aspect of a battery according to one embodiment after sealing. [Figure 9B] FIG. 9B is a second schematic diagram illustrating the state of the battery according to one embodiment after sealing. [Figure 10A] FIG. 10A is a schematic view showing a state in which a pulling member is hooked onto a claw portion according to the second embodiment. [Figure 10B] FIG. 10B is a first schematic view showing a state in which the pulling member is squeezed by the claw portion according to the second embodiment. [Figure 10C] FIG. 10C is a second schematic view showing a state in which the pulling member is squeezed by the claw portion according to the second embodiment. [Figure 11A] FIG. 11A is a first schematic view showing a state before the battery according to the third embodiment is sealed. [Figure 11B] FIG. 11B is a second schematic view showing the state before the battery according to the third embodiment is sealed. [Figure 12A] FIG. 12A is a first schematic view showing the state after the battery according to the third embodiment has been sealed. [Figure 12B] FIG. 12B is a second schematic view showing the state after the battery according to the third embodiment has been sealed. [Figure 13A] FIG. 13A is a first explanatory diagram for illustrating insertion of an electrode body according to the fourth embodiment. [Figure 13B] FIG. 13B is a first explanatory diagram for explaining insertion of the electrode body according to the fourth embodiment. [Figure 14A] FIG. 14A is a schematic view showing a state before the pulling member is gripped by the claw portions according to the fourth embodiment. [Figure 14B]FIG. 14B is a first schematic view showing a state after the pulling member is gripped by the claw portions according to the fourth embodiment. [Figure 14C] FIG. 14C is a second schematic view showing a state after the pulling member is gripped by the claw portions according to the fourth embodiment. [Figure 15A] FIG. 15A is a first schematic view showing a state before the battery according to the fourth embodiment is sealed. [Figure 15B] FIG. 15B is a second schematic view showing the state before the battery according to the fourth embodiment is sealed. [Figure 16A] FIG. 16A is a first schematic view showing the state after the battery according to the fourth embodiment has been sealed. [Figure 16B] FIG. 16B is a second schematic view showing the state after the battery according to the fourth embodiment has been sealed. [Figure 17A] FIG. 17A is a schematic view showing a state before the pulling member is gripped by the claw portions according to the fifth embodiment. [Figure 17B] FIG. 17B is a first schematic view showing a state after the pulling member is gripped by the claw portions according to the fifth embodiment. [Figure 17C] FIG. 17C is a second schematic view showing a state after the pulling member is gripped by the claw portions according to the fifth embodiment. [Figure 18A] FIG. 18A is a first schematic view showing a state in which a pulling member is hooked on a notch portion of an insulating film according to a sixth embodiment. [Figure 18B] FIG. 18B is a second schematic view showing a state in which the pulling member is hooked on the notch portion of the insulating film according to the sixth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0007] Several embodiments of the technology disclosed herein will be described below with reference to the drawings. In the following drawings, components and parts that perform the same function are denoted by the same reference numerals. Furthermore, the dimensional relationships (length, width, thickness, etc.) in each drawing do not reflect the actual dimensional relationships. Matters other than those specifically mentioned in this specification that are necessary for implementing the technology disclosed herein (e.g., the general configuration and manufacturing process of an electricity storage device that does not characterize this disclosure) can be understood as design matters of a person skilled in the art based on prior art in the relevant field. The technology disclosed herein can be implemented based on the content disclosed in this specification and common technical knowledge in the relevant field. Furthermore, the following description is not intended to limit the present disclosure to the following forms.

[0008] In this specification, the notation "A to B" indicating a range means "greater than A and less than B." It also encompasses the meanings of "greater than A" and "less than B." In addition, in this specification, the term "electricity storage device" refers to a device that can charge and discharge. Electricity storage devices include batteries such as primary batteries and secondary batteries (for example, non-aqueous electrolyte secondary batteries such as lithium ion secondary batteries, and nickel-metal hydride batteries), and capacitors (physical batteries) such as electric double layer capacitors. The electrolyte may be any of a liquid electrolyte (electrolytic solution), a gel electrolyte, and a solid electrolyte. Hereinafter, a lithium ion secondary battery (hereinafter simply referred to as "battery 100"), which is one embodiment of the electricity storage device disclosed herein, will be described as an example.

[0009] <Battery configuration> FIG. 1 is a perspective view of a battery 100 according to one embodiment. FIG. 2 is a perspective view of the battery 100 of FIG. 1 turned upside down. FIG. 3 shows the internal structure of the battery 100 of FIG. 1. In the following description, the symbols L, R, F, Rr, U, and D in the drawings represent left, right, front, rear, top, and bottom, and the symbols X, Y, and Z in the drawings represent the short side direction of the battery 100, the long side direction perpendicular to the short side direction, and the up-down direction perpendicular to the short side direction and the long side direction, respectively. However, these directions are determined for the convenience of explanation and do not limit the installation mode of the battery 100 in any way.

[0010] As shown in Fig. 3, the battery 100 includes a battery case 10, an electrode assembly 20, a positive electrode terminal 30, a negative electrode terminal 40, and an insulating film 50. Although not shown, the battery 100 further includes an electrolyte. The secondary battery 100 here is a lithium ion secondary battery. The battery 100 is preferably a lithium ion secondary battery.

[0011] The battery case 10 is a housing that houses the electrode assembly 20, the insulating film 50, and the electrolyte. As shown in FIGS. 1 and 2, the battery case 10 has a flat, bottomed, rectangular parallelepiped (rectangular) outer shape. The battery case 10 is preferably rectangular. The material of the battery case 10 may be the same as that conventionally used, and is not particularly limited. The battery case 10 is preferably made of metal, and more preferably made of, for example, aluminum, an aluminum alloy, iron, an iron alloy, or the like.

[0012] 3, the battery case 10 includes a case body 12 having a pair of openings 12h and two lids 14 (specifically, a first lid 14a and a second lid 14b) that close the pair of openings 12h. The battery case 10 is integrated by joining (for example, welding) the lids 14 to the peripheries of the pair of openings 12h of the case body 12. The battery case 10 is hermetically sealed (sealed).

[0013] The case body 12 has a rectangular cylindrical shape and has openings 12h on both sides in its longitudinal direction (corresponding to the Y direction in FIG. 3). In this embodiment, the case body 12 has a rectangular cylindrical shape with rectangular openings 12h on both ends, and has an elongated shape in which the longitudinal direction is sufficiently long relative to the long sides of the openings 12h. On the other hand, the opening 12h has a shape slightly wider than a cross section of the electrode body 20 when cut along the opening 12h. As shown in FIG. 1, the case body 12 has a substantially rectangular short side wall 12a, a pair of long side walls 12b extending from the long sides of the short side wall 12a and facing each other, and another short side wall 12a connecting the upper ends of the pair of long side walls 12b. The long side wall 12b has a substantially rectangular shape. The short side wall 12a faces the other short side wall 12a. The case body 12 can also be said to have a pair of opposing long side walls 12b and a pair of opposing short side walls 12a that are continuous with the pair of long side walls 12b. The area of ​​the short side walls 12a is smaller than that of the long side walls 12b. The case body 12 is formed, for example, by bending a single metal plate into a cylindrical shape and joining the seams (for example, by welding). Here, a welded joint 12d is located on one of the short side walls 12a. A gas exhaust valve 13 is provided on the other short side wall 12a.

[0014] The gas release valve 13 is configured to break when the pressure inside the battery case 10 reaches or exceeds a predetermined value, thereby releasing the gas inside the battery case 10 to the outside. In this embodiment, there is one gas release valve 13, but there may be two or more. In this embodiment, the gas release valve 13 is provided on the short side wall 12a, but in other embodiments, the gas release valve 13 may be provided on a surface other than the short side wall 12a, such as the long side wall 12b or the lid 14. The area of ​​the gas release valve 13 is arbitrary.

[0015] In this embodiment, the gas release valve 13 is a cross-shaped notch. However, the shape of the gas release valve 13 is not particularly limited. In other embodiments, the gas release valve 13 may be, for example, a linear notch (vertical or horizontal only), or may be a conventionally known oval valve (with a notch therein) or a circular valve (with a notch therein). The dimensions of the notch (length, depth) are arbitrary and can be determined appropriately taking into consideration, for example, the pressure resistance of the battery case 10.

[0016] The lid 14 is a plate-like member that seals the opening 12h. The lid 14 has a substantially rectangular shape in a plan view. The area of ​​the lid 14 is smaller than that of the long side wall 12b. The lid 14 has a liquid inlet 15. The liquid inlet 15 is used to inject the electrolyte into the battery case 10 after the lid 14 is assembled to the case body 12. The liquid inlet 15 is sealed with a sealing member 16 after the electrolyte is injected. Note that in this embodiment, the liquid inlet 15 is provided in the lid 14, but in other embodiments, the liquid inlet 15 may be provided in the case body 12. Also, in this embodiment, the liquid inlet 15 is provided on a different surface from the gas release valve 13, but in other embodiments, the liquid inlet 15 may be provided on the same surface as the gas release valve 13.

[0017] The positive electrode terminal 30 and the negative electrode terminal 40 are each fixed to the battery case 10. Here, the positive electrode terminal 30 and the negative electrode terminal 40 are each fixed to opposing surfaces of the battery case 10 (specifically, the lid 14). More specifically, the positive electrode terminal 30 is attached to the lid 14 located on one side in the long side direction Y (the right side in FIGS. 1 and 2). The negative electrode terminal 40 is attached to the lid 14 located on the other side in the long side direction Y (the left side in FIGS. 1 and 2). In this embodiment, the positive electrode terminal 30 and the negative electrode terminal 40 are provided on the lid 14, but in other embodiments, the positive electrode terminal 30 and the negative electrode terminal 40 may be provided on the case main body 12. In this embodiment, the positive electrode terminal 30 and the negative electrode terminal 40 are provided on a surface different from the gas release valve 13, but in other embodiments, the positive electrode terminal 30 and the negative electrode terminal 40 may be provided on the same surface as the gas release valve 13.

[0018] The positive electrode terminal 30 and the negative electrode terminal 40 are each exposed on the outer surface of the lid 14. Here, the positive electrode terminal 30 and the negative electrode terminal 40 are arranged on an axis that extends in the long side direction Y and passes through the center of the lid 14. However, in other embodiments, the axis may be offset from the center of the lid 14, for example, in the short side direction X. Furthermore, the positive electrode terminal 30 and the negative electrode terminal 40 do not have to be arranged on the axis. For example, one of the positive electrode terminal 30 and the negative electrode terminal 40 may be offset to one side in the short side direction X, and the other may be offset to the other side in the short side direction X.

[0019] The positive electrode terminal 30 is preferably made of a metal, more preferably aluminum or an aluminum alloy, for example, and the negative electrode terminal 40 is preferably made of a metal, more preferably copper or a copper alloy, for example.

[0020] As shown in Fig. 3, the positive electrode terminal 30 is electrically connected to the positive electrode 21 of the electrode assembly 20 via a positive electrode current collector 32 inside the battery case 10. The negative electrode terminal 40 is electrically connected to the negative electrode 22 of the electrode assembly 20 via a negative electrode current collector 42 inside the battery case 10. The positive electrode terminal 30 and the negative electrode terminal 40 are insulated from the case body 12 by an insulating film 50. The positive electrode terminal 30 and the negative electrode terminal 40 are insulated from the lid 14 by an insulating member 60 (see Fig. 4).

[0021] The electrode body 20 is housed inside the battery case 10. FIG. 4 is a perspective view of the electrode body 20 attached to the lid 14. As shown in FIG. 4, the electrode body 20 is placed inside the battery case 10 while covered with an insulating film 50, which will be described later. In this embodiment, one electrode body 20 is housed inside one battery case 10. However, the number of electrode bodies 20 housed inside one battery case 10 is not particularly limited, and in other embodiments, there may be two or more (plural) electrode bodies.

[0022] As shown in Fig. 3, the electrode assembly 20 includes a positive electrode 21 and a negative electrode 22. Here, the electrode assembly 20 is a wound electrode assembly. Specifically, the electrode assembly 20 is formed by winding a laminate formed by stacking a strip-shaped positive electrode 21 and a strip-shaped negative electrode 22 with a strip-shaped separator 26 interposed therebetween in the longitudinal direction around a winding axis. However, in other embodiments, the electrode assembly 20 may be a laminated electrode assembly formed by stacking a rectangular positive electrode and a rectangular negative electrode in an insulated state.

[0023] Here, the electrode body 20 has a flat outer shape. The electrode body 20 has a pair of curved portions and a pair of flat surfaces connecting the pair of curved portions. Here, the electrode body 20 is housed inside the battery case 10 with its winding axis oriented along the long side direction Y. The electrode body 20 is of a horizontally wound type. The pair of curved portions of the electrode body 20 face a pair of short side walls 12a of the case body 12, respectively. The pair of flat surfaces of the electrode body 20 face a pair of long side walls 12b of the case body 12, respectively. However, the electrode body 20 may also be housed inside the battery case 10 with its winding axis oriented along the up-down direction Z, for example. The electrode body 20 may also be of a vertically wound type. The components constituting the electrode body 20 (such as the positive electrode 21, negative electrode 22, and separator 26) may be similar to those of a general secondary battery and are not particularly limited.

[0024] In this embodiment, as shown in FIG. 4, the pair of side surfaces 20a of the electrode body 20 are rectangular with long and short sides. Here, the ratio of the length of the long side to the length of the short side (long side length / short side length) is not particularly limited as long as the effects of the technology disclosed herein are exhibited. The ratio (long side length / short side length) is, for example, 1.2 or more, and from the viewpoint of being suitable for use in the technology disclosed herein, is preferably 1.5 or more, more preferably 2 or more, or 3 or more. The upper limit of the ratio (ratio of the long side length / short side length) is, for example, 5 or less, preferably 4 or less. For example, when the ratio (ratio of the long side length / ratio of the short side) is 1.5 or more and 4 or less, it is suitable for use in the technology disclosed herein.

[0025] The electrode assembly 20 here includes a positive electrode tab 23 and a negative electrode tab 24 extending in opposite directions. The positive electrode tab 23 is a portion extending from the end of the first side (right side) of the electrode assembly 20 toward the first side. The positive electrode tab 23 is a portion where no positive electrode active material layer is formed and the positive electrode current collector is exposed. The positive electrode tab 23 is configured by stacking multiple layers of positive electrode current collectors protruding toward the first side. The negative electrode tab 24 is a portion extending from the end of the second side (left side) of the electrode assembly 20 toward the second side. The negative electrode tab 24 is a portion where no negative electrode active material layer is formed and the negative electrode current collector is exposed. The negative electrode tab 24 is configured by stacking multiple layers of negative electrode current collectors protruding toward the second side. Note that in other embodiments, the electrode assembly 20 may not have the positive electrode tab 23 and the negative electrode tab 24.

[0026] The positive electrode 21 typically includes a positive electrode current collector and a positive electrode active material layer fixed to at least one surface of the positive electrode current collector. The positive electrode current collector is strip-shaped here. The positive electrode current collector is made of a conductive metal such as aluminum, an aluminum alloy, nickel, or stainless steel. Here, the positive electrode current collector is a metal foil, specifically, an aluminum foil.

[0027] The positive electrode active material layer is provided in a strip-like shape along the longitudinal direction of the strip-shaped positive electrode current collector. The positive electrode active material layer contains a positive electrode active material capable of reversibly absorbing and releasing charge carriers. The positive electrode active material is preferably an oxide containing at least one of Ni, Co, and Mn, such as lithium transition metal composite oxides such as lithium cobalt oxide, lithium manganese oxide, lithium nickel oxide, lithium nickel manganese composite oxide, and lithium nickel cobalt composite oxide. The positive electrode active material is preferably, for example, a composite oxide containing Ni and Li, in which the Ni content in the composite oxide is in the range of 70 to 100 mol% relative to the total number of moles of the constituent elements excluding Li and oxygen in the composite oxide. Positive electrode active materials also include those in which a portion of the Ni, Co, and Mn is replaced with Al, Ti, Zr, P, B, Si, Nb, C, etc., or those in which the particle surface is covered with a compound containing Al, Ti, Zr, W, P, B, Si, Nb, C, etc. The total amount of substitution and addition is about 0.1 to 7 mol %.

[0028] The negative electrode 22 typically includes a negative electrode current collector and a negative electrode active material layer fixed to at least one surface of the negative electrode current collector. The negative electrode current collector is strip-shaped here. The negative electrode current collector is made of a conductive metal such as copper, a copper alloy, nickel, or stainless steel. Here, the negative electrode current collector is a metal foil, specifically a copper foil.

[0029] The negative electrode active material layer is provided in a strip shape along the longitudinal direction of the strip-shaped negative electrode current collector. The negative electrode active material layer contains a negative electrode active material capable of reversibly absorbing and releasing charge carriers. Examples of the negative electrode active material include carbon materials such as graphite and carbon, and metals capable of absorbing lithium such as Si, SiO, SiC, and Sn, and compounds thereof.

[0030] The separator 26 is a member that insulates the positive electrode active material layer from the negative electrode active material layer. A porous resin sheet made of a polyolefin resin such as polyethylene (PE) or polypropylene (PP) is suitable as the separator 26. A heat resistance layer (HRL) containing an inorganic filler may be provided on the surface of the separator 26. Examples of inorganic fillers that can be used include alumina, boehmite, aluminum hydroxide, and titania.

[0031] The electrolyte solution is accommodated inside the battery case 10 together with the electrode assembly 20. The electrolyte solution may be the same as that used in general secondary batteries and is not particularly limited. The electrolyte solution is typically a non-aqueous liquid electrolyte (nonaqueous electrolyte solution) containing a non-aqueous solvent and a supporting salt. The non-aqueous solvent contains, for example, carbonates such as ethylene carbonate (EC), ethyl methyl carbonate (EMC), and dimethyl carbonate (DMC). The non-aqueous solvent is preferably a mixture of EC, EMC, and DMC in a volume ratio of 1 to 99% so that the total ratio is 100%. The supporting salt is, for example, a fluorine-containing lithium salt. The fluorine-containing lithium salt preferably contains lithium hexafluorophosphate (LiPF), lithium bis(fluorosulfonyl)imide (F2LiNO4S2), also known as LiFSI, or a mixture thereof. The concentration of the supporting salt is preferably 0.6 to 1.8 mol per liter of non-aqueous solvent.

[0032] The insulating film 50 is housed inside the battery case 10 together with the electrode assembly 20. The insulating film 50 is disposed between the battery case 10 and the electrode assembly 20. As shown in FIG. 4, the insulating film 50 covers the periphery of the electrode assembly 20. Specifically, the insulating film 50 preferably covers the curved portions and the pair of flat surfaces that face the pair of short side walls 12a of the electrode assembly 20. The insulating film 50 is made of a single sheet-like member assembled into, for example, a box, bag, or cylinder. Examples of materials that can be used to form the insulating film 50 include various thermoplastic resin materials, typically polyolefin-based resin materials such as polypropylene (PP) and polyethylene (PE).

[0033] The configuration of the battery 100 according to this embodiment has been described above. From the standpoint of vehicle installation efficiency and the like, the present inventors would like to provide a battery 100 having a horizontally elongated rectangular tubular case body 12 with a large aspect ratio, as shown in FIGS. 1 and 2 . In this type of battery 100, it is envisioned that the electrode assembly 20 will be inserted through one opening 12h of the case body 12. In such a case, it is desirable to smoothly insert the electrode assembly 20 into the horizontally elongated rectangular tubular case body 12. In particular, considering future mass production, it is preferable that the battery 100 can be manufactured by machine. For such mechanization, it is important to develop a method for smoothly inserting the electrode assembly 20 into the horizontally elongated rectangular tubular case body 12.

[0034] A method for manufacturing the battery 100 according to this embodiment will be described below. First, an electrode assembly insertion device 200 that embodies the insertion step S6 of the method for manufacturing the battery 100 according to this embodiment will be described. Note that the following description is not intended to limit the battery manufacturing method and the electrode assembly insertion device to the following form. Furthermore, the method for manufacturing the battery 100 disclosed herein may further include other steps at any stage.

[0035] <Electrode body insertion device 200> 6A and 6B are first and second explanatory views, respectively, for explaining the insertion of an electrode body 20 according to one embodiment. As shown in Fig. 6A and Fig. 6B, the electrode body insertion device 200 according to this embodiment includes an arm portion 210 and a claw portion 220. Each component will be described below.

[0036] <Arm part 210> The arm portion 210 is a member that supports the claw portion 220. In this embodiment, as shown in FIGS. 6A and 6B , the arm portion 210 moves in the long side direction Y, causing the claw portion 220 to move in the long side direction Y. This allows the electrode body 20 to be inserted into the case body 12. The shape of the arm portion 210 is not particularly limited as long as the effects of the technology disclosed herein are achieved. On the other hand, from the perspective of suitably inserting the electrode body 20 into the case body 12, it is preferable that the length of the arm portion 210 in the long side direction Y is longer than the length of the case body 12. Furthermore, the material constituting the arm portion 210 is not particularly limited as long as the effects of the technology disclosed herein are achieved. The arm portion 210 may be made of, for example, metal, resin, or a combination thereof.

[0037] <Claw part 220> The claw portion 220 is supported by the arm portion 210. The claw portion 220 is a member that holds the end of the pulling member A1. In this embodiment, as shown in FIGS. 6A and 6B, the claw portion 220 is a member that hooks onto the end of the pulling member A1. In this embodiment, the claw portion 220 functions as a chuck (e.g., an electrostatic chuck). In this case, the claw portion 220 can attract and fix the end of the pulling member A1. This allows the pulling member A1 to be stably fixed to the claw portion 220. The shape of the claw portion 220 may be L-shaped as in this embodiment, or may be various shapes such as U-shaped, hook-shaped, or clamp-shaped in other embodiments. Note that in this embodiment, the material constituting the claw portion 220 is a material that exhibits the function of a chuck as described above. However, in other embodiments, the material may be metal, resin, or a combination thereof. The materials constituting the arm portion 210 and the claw portion 220 may be the same or different.

[0038] The electrode body insertion device 200 is controlled by a control unit (not shown). Like a general control unit, this control unit is composed of a calculation unit (CPU), a storage unit (memory), an input unit, an output unit, etc. The storage unit stores a program configured to move the arm unit 210 in the long side direction Y. It also stores a program configured to enable switching on / off of the chuck in the claw unit 220. The calculation unit reads and executes these programs, thereby moving the arm unit 210 and switching on / off of the chuck in the claw unit 220. Note that the configuration of the control unit itself does not characterize the technology disclosed herein, so a detailed description thereof will be omitted.

[0039] <Battery manufacturing method> Next, a manufacturing method of the battery 100 according to this embodiment will be described with reference to the electrode assembly insertion device 200. FIG. 5 is a flowchart for explaining the manufacturing method of the battery 100 according to one embodiment. FIGS. 7A and 7B are first and second schematic views, respectively, illustrating a state in which the pulling member A1 is hooked onto the claw portion 220 according to one embodiment. For clarity, the positive electrode tab 23 and the positive electrode current collector 32 are omitted from FIGS. 7A and 7B. FIGS. 8A and 8B are first and second schematic views, respectively, illustrating a state before the battery 100 according to one embodiment is sealed. FIGS. 9A and 9B are first and second schematic views, respectively, illustrating a state after the battery 100 according to one embodiment is sealed. The following description will discuss the case in which the electrode assembly 20 is inserted into the case body 12 while it is covered with the insulating film 50 in advance.

[0040] The manufacturing method for the battery 100 according to this embodiment includes a case body preparation step S1 in which a rectangular cylindrical case body 12 having openings on both sides in the length direction (here, corresponding to the long side direction Y) is prepared. It also includes an electrode body preparation step S2 in which an electrode assembly 20 to be housed in the case body 12 is prepared. It also includes an insertion step S6 in which the electrode assembly 20 is inserted into the case body 12 through one opening 12h of the case body 12. As described above, the case body 12 has a pair of opposing side walls (here, corresponding to the long side walls 12b). As shown in FIG. 4, the electrode assembly 20 has a pair of side surfaces (here, corresponding to the side surfaces 20a) that face the pair of side walls when housed in the case body 12. In the insertion step S6, a pulling member A1 is prepared. As shown in FIG. 6A, the pulling member A1 is wound around the electrode assembly 20 so as to align with the rear end P of the electrode assembly 20 in the insertion direction (corresponding to the direction of the outline arrow) and the pair of side surfaces 20a. Then, with the end of the pulling member A1 (here, corresponding to A1e in FIG. 6A) positioned on the front side in the insertion direction (corresponding to the right side in FIG. 6A), the electrode body 20 is inserted into one opening 12h of the case body 12. Then, while pulling the end of the pulling member A1, the electrode body 20 is inserted into the case body 12. Here, the end of the pulling member A1 can also be referred to as the portion that protrudes outward from the tip Q of the electrode body 20 in the insertion direction. Furthermore, pulling the end of the pulling member A1 can mean pulling at least a part of the portion that protrudes outward from the tip Q of the electrode body 20 in the insertion direction.

[0041] In the manufacturing method of the battery 100 described above, as shown in FIGS. 6A and 6B , a pulling member A1 is placed around the electrode body 20. Then, the electrode body 20 is inserted into the case body 12 while pulling the pulling member A1. This allows the electrode body 20 to be easily inserted into the horizontally elongated rectangular tubular case body 12. Furthermore, in the manufacturing method of the battery 100 described above, the electrode body 20 is inserted while the rear end P of the electrode body 20 is supported by the pulling member A1. This allows the electrode body 20 to be inserted into the case body 12 while suitably maintaining the shape of the electrode body 20. In this way, the manufacturing method of the battery 100 disclosed herein allows the battery 100 to be manufactured with high productivity.

[0042] As shown in FIG. 5, this embodiment further includes an insulating film arrangement step S3, a first lid preparation step S4, and a connection step S5 in addition to the case body preparation step S1, electrode assembly preparation step S2, and insertion step S6 described above. Each step will be described below. Note that in the following description, the "first electrode" in the claims will be the negative electrode 22 and the "second electrode" will be the positive electrode 21, but this is not limiting. For example, in other embodiments, the "first electrode" may be the positive electrode 21 and the "second electrode" may be the negative electrode 22.

[0043] <Case body preparation process S1> As described above, in this step, a square cylindrical case body 12 with openings on both sides in the length direction (here, corresponding to the long side direction Y) is prepared as shown in Fig. 1. The case body 12 can be obtained, for example, by bending a single metal plate into a cylindrical shape and joining the seams (for example, by welding).

[0044] <Electrode body preparation process S2> As described above, in this step, the electrode assembly 20 to be housed in the case body 12 is prepared as shown in FIG. 4. The electrode assembly 20 includes a positive electrode 21 and a negative electrode 22. In this embodiment, a plurality of negative electrode tabs 24 extending from the negative electrode 22 are present at the rear end of the electrode assembly 20 in the insertion direction (corresponding to P in FIG. 6A). Also, in this embodiment, a plurality of positive electrode tabs 23 extending from the positive electrode 21 are present at the front end of the electrode assembly 20 in the insertion direction (corresponding to Q in FIG. 6A). The electrode assembly 20 can be produced, for example, by a conventionally known method.

[0045] <Insulating film placement process S3> In this step, the electrode body 20 is covered with an insulating film 50. In this embodiment, the electrode body 20 and the insulating member 60 (corresponding to the spacer) are collectively covered with the insulating film 50. The insulating film 50 here is cylindrical. In this embodiment, as shown in FIGS. 3 and 4, it covers a pair of curved portions and a pair of flat surfaces (corresponding to the side surfaces 20a) of the electrode body 20. The insulating film 50 may be arranged around the electrode body 20 manually or by using a machine.

[0046] <First lid preparation process S4> In this step, a first lid 14a equipped with a negative electrode terminal 40 is prepared. The negative electrode terminal 40 is fixed to the first lid 14a. Fixing of the negative electrode terminal 40 to the first lid 14a can be carried out by a conventionally known method.

[0047] <Connection step S5> In this step, the negative electrode 22 and the negative electrode terminal 40 are electrically connected. Specifically, the negative electrode current collecting part 42 joined to the multiple negative electrode tabs 24 is joined to the negative electrode terminal 40 fixed to the first lid 14a. This connection can be performed by a conventionally known method.

[0048] <Insertion process S6> As described above, in this step, the electrode assembly 20 is inserted into the case body 12 through one opening 12h of the case body 12. Specifically, first, as shown in FIGS. 6A and 6B, a pulling member A1 is prepared. The pulling member A1 is a member that is wrapped around the electrode assembly 20 and pulls the electrode assembly 20 toward the case body 12. The number of pulling members A1 may be one as in this embodiment, or two or more (plural) in other embodiments. The shape of the pulling member A1 is not particularly limited as long as the effects of the technology disclosed herein are exhibited. The pulling member A1 may be annular as in this embodiment, or may be strip-shaped as described below. For example, a ring-shaped pulling member A1 is preferable because it is less likely to be pinched in the fitting portion between the second cover 14b and the case body 12. In addition, the size (specifically, width, thickness, and length) of the pulling member A1 is preferably determined appropriately depending on the size of the electrode assembly 20 to be pulled. In one embodiment, the width of the pulling member A1 can be within a range of 5 mm to 20 mm (for example, 5 mm to 10 mm), and the thickness of the pulling member A1 can be within a range of 0.1 mm to 5 mm (for example, 0.5 mm to 1 mm).

[0049] The material constituting the pulling member A1 is not particularly limited as long as the effects of the technology disclosed herein are exhibited. Examples of materials constituting the pulling member A1 include fluorine-based resins such as perfluoroalkoxy fluorine resin (PFA) and polytetrafluoroethylene (PTFE), and polyolefin-based resins such as polyphenylene sulfide resin (PPS), polyethylene (PE), and polypropylene (PP). These may be contained alone or in combination of two or more. Among the above-mentioned resins, fluorine-based resins are particularly suitable for use because they have low frictional resistance with the electrode body 20 and the insulating film 50.

[0050] The pulling member A1 may be a ribbon or a tape. Alternatively, the pulling member A1 may include a substrate and an adhesive layer formed on the substrate. The adhesive layer is preferably disposed on the surface of the substrate that contacts the surface of the insulating film 50. With this configuration, the pulling member A1 can be more stably disposed on the insulating film 50. For example, the above-mentioned resins can be used as the above-mentioned substrate. Examples of materials that can form the above-mentioned adhesive layer include acrylic adhesives, silicone adhesives, and rubber adhesives. The adhesive layer preferably has adhesiveness at room temperature (typically, about 20±5°C). The pulling member A1 may have a matte surface so that it can be stably disposed on the electrode body 20 or the insulating film 50.

[0051] 6A and 6B, a pulling member A1 is wound around the electrode assembly 20 so as to be aligned with the rear end P and the pair of side surfaces 20a in the insertion direction of the electrode assembly 20 (corresponding to the direction of the outline arrow). In a preferred embodiment, as in the present embodiment, the electrode assembly 20 includes a positive electrode 21 and a negative electrode 22, and has a negative electrode tab 24 extending from the negative electrode 22 at the rear end P in the insertion direction of the electrode assembly 20. Then, in the insertion step S6, the pulling member A1 is wound around the electrode assembly 20 so as to avoid the negative electrode tab 24. If a negative electrode tab 24 is present at the rear end P of the electrode assembly 20 in the insertion direction, damage to the negative electrode tab 24 can be suitably prevented by arranging the pulling member A1 so as to avoid the tab of the negative electrode 24.

[0052] Next, the end of the pulling member A1 is placed on the front side in the insertion direction (the right side in FIG. 6A). More specifically, the pulling member A1 is placed so that the end of the pulling member A1 protrudes outward from the tip portion Q of the electrode body 20. Then, as shown in FIGS. 6A and 6B, the end of the annular pulling member A1 is hooked onto the claw portion 220. Next, while pulling the end of the pulling member A1 with the arm portion 210 (see FIGS. 7A and 7B), the electrode body 20 is inserted into one opening 12h of the case body 12. Then, while pulling the end of the pulling member A1 with the arm portion 210, the electrode body 20 is inserted into the case body 12. The speed at which the pulling member A1 is pulled with the arm portion 210 can be determined appropriately through a preliminary experiment or the like.

[0053] After inserting the electrode assembly 20 into the case body 12, the positive electrode 21 and the positive electrode terminal 30 are electrically connected. Specifically, the positive electrode current collector 32, which is joined to the multiple positive electrode tabs 23, is joined to the positive electrode terminal 30, which is fixed to the second lid body 14b (see FIGS. 8A and 8B). Then, the first lid body 14a and the second lid body 14b are fitted to the case body 12 (see FIGS. 9A and 9B). More specifically, the first lid body 14a and the second lid body 14b are joined (for example, welded) to the peripheries of the pair of openings 12h of the case body 12. In this embodiment, after inserting the electrode assembly 20 into the case body 12, the end of the pulling member A1 is folded and the pulling member A1 is stored in the battery case 10. Then, an electrolyte is injected through the liquid injection hole 15, and the liquid injection hole 15 is sealed with the sealing member 16. After this injection, the battery 100 can be obtained by carrying out treatments such as initial charging and aging as appropriate.

[0054] As described above, in this embodiment, the electrode body 20 includes the positive electrode 21 and the negative electrode 22. The method also includes a first lid body preparation step S4 of preparing a first lid body 14a equipped with the negative electrode terminal 40. The method also includes a connection step S5 of electrically connecting the negative electrode 22 and the negative electrode terminal 40. Then, the insertion step S6 is performed with the negative electrode 22 and the negative electrode terminal 40 connected in advance. In this way, by performing the insertion step S6 with the negative electrode 22 and the negative electrode terminal 40 connected in advance, the battery 100 can be manufactured more easily.

[0055] Battery 100 can be used for a variety of purposes, but can be suitably used, for example, as a power source (driving power source) for motors mounted on vehicles such as passenger cars, trucks, etc. The type of vehicle is not particularly limited, but examples include plug-in hybrid electric vehicles (PHEVs), hybrid electric vehicles (HEVs), battery electric vehicles (BEVs), etc.

[0056] The embodiment (first embodiment) of the technology disclosed herein has been described above. However, the above description is merely an example and does not limit the scope of the claims. The technology described in the claims includes various modifications and changes to the specific examples exemplified in the above description.

[0057] For example, in the above embodiment, in addition to the case body preparation step S1, the electrode body preparation step S2, and the insertion step S6, an insulating film arrangement step S3, a first lid body preparation step S4, and a connection step S5 are included, but this is not limited to this. The method for manufacturing an electricity storage device disclosed herein does not necessarily include the insulating film arrangement step S3, the first lid body preparation step S4, and the connection step S5. For example, if the insulating film arrangement step S3 is not included, a cylindrical insulating film 50 can be arranged on the case body 12 side in advance, and the electrode body 20 can be inserted therein.

[0058] For example, in the above embodiment, the electrode body 20 is inserted into one opening 12h of the case body 12 while pulling the end of the pulling member A1 with the arm portion 210, and then the electrode body 20 is inserted into the case body 12 while pulling the end of the pulling member A1 with the arm portion 210. However, this is not limited to this. In other embodiments, the electrode body 20 may be inserted into one opening 12h of the case body 12 in advance, and then the electrode body 20 may be inserted into the case body 12 while pulling the end of the pulling member A1 with the arm portion 210.

[0059] For example, in the above embodiment, after the electrode body 20 is inserted into the case body 12, the end of the pulling member A1 is folded and the pulling member A1 is stored in the battery case 10, but this is not limited to this. In other embodiments, the pulling member A1 may be removed after the electrode body 20 is inserted into the case body 12. Furthermore, in other embodiments, the second lid 14b may be fitted to the case body 12 after the portion of the pulling member A1 protruding from the case body 12 is appropriately cut off.

[0060] For example, in the above embodiment, only one claw portion 220 is used to hold the pulling member A1, but this is not limiting. Here, FIG. 10A is a schematic diagram showing a state in which the pulling member A1 is hooked onto the claw portion 320 according to the second embodiment. FIG. 10B is a first schematic diagram showing a state in which the pulling member A1 is squeezed by the claw portion 320 according to the second embodiment. For clarity, the positive electrode tab 23 and the positive electrode current collector 32 are omitted from FIGS. 10A to 10C. FIG. 10C is a second schematic diagram showing a state in which the pulling member A1 is squeezed by the claw portion 310 according to the second embodiment. In FIGS. 10A to 10C, 300, 310, 320, 320a, and 320b denote the electrode body insertion device, arm portion, claw portion, first claw portion, and second claw portion, respectively. The claw portion 320 is L-shaped here.

[0061] In the second embodiment, the pulling member A1 is held using a total of three claws: two first claws 320a and one second claw 320b. Specifically, first, as shown in FIG. 10A, the end of the pulling member A1 is hooked onto the second claw 320b. Next, as shown in FIG. 10B, the first claw 320a is moved in the direction of the black arrow. This allows the electrode assembly 20 to be pulled while being clamped by the pulling member A1 (see FIGS. 10B and 10C). This makes it possible to pull the electrode assembly 20 in a more stable state.

[0062] For example, in the above embodiment, the annular pulling member A1 is stored as is in the case main body 12, but this is not limited to this. Here, Fig. 11A and Fig. 11B are first and second schematic diagrams, respectively, showing the battery 100 according to the third embodiment before sealing. Fig. 12A and Fig. 12B are first and second schematic diagrams, respectively, showing the battery 100 according to the third embodiment after sealing.

[0063] In the third embodiment, as shown in FIGS. 11A and 11B, a protrusion 70 (step) is provided on the second cover 14b. In this case, as shown in FIGS. 12A and 12B, when the second cover 14b is fitted to the case body 12, the annular pulling member A1 is pushed by the protrusion 70 and naturally bends. This allows the end of the pulling member A1 to be accommodated in the internal space without being pinched by the fitting portion. More specifically, when the pulling member A1 is stretched in the internal space of the case body 12, making it difficult to fit the second cover 14b to the case body 12, the protrusion 70 is provided on the inside of the second cover 14b. This promotes bending of the pulling member A1 and can suitably prevent the pulling member A1 from being stretched inside when the second cover 14b is fitted. The shape of the protrusion 70 may be rectangular as in this embodiment, or may be various shapes such as a cylindrical or polygonal prism. The protrusion 70 may be made of, for example, resin. The protrusion 70 may be bonded to the second cover 14b using, for example, a conventionally known adhesive used for this type of bonding. The size of the protrusion 70 is preferably determined appropriately depending on the size of the traction member A1.

[0064] For example, in the above embodiment, the shape of the pulling member A1 is annular, but is not limited to this. Below, a case where the shape of the pulling member is strip-shaped (more specifically, U-shaped) will be described.

[0065] FIG. 13A is a first explanatory diagram illustrating insertion of the electrode assembly 20 according to the fourth embodiment. FIG. 13B is a first explanatory diagram illustrating insertion of the electrode assembly 20 according to the fourth embodiment. FIG. 14A is a schematic diagram illustrating a state before the pulling member A2 is gripped by the claw portion 420 according to the fourth embodiment. FIG. 14B is a first schematic diagram illustrating a state after the pulling member A2 is gripped by the claw portion 420 according to the fourth embodiment. In FIGS. 14A to 14C, the positive electrode tab 23 and the positive electrode current collecting portion 32 are omitted for clarity. FIG. 14C is a second schematic diagram illustrating a state after the pulling member A2 is gripped by the claw portion 420 according to the fourth embodiment. FIGS. 15A and 15B are first and second schematic diagrams, respectively, illustrating a state before the battery 100 according to the fourth embodiment is sealed. 16A and 16B are first and second schematic views, respectively, showing the state of the battery 100 according to the fourth embodiment after sealing.

[0066] 13A, 13B, 14A to 14C, and 17A to 17C, 400, 410, and 420 respectively denote an electrode body insertion device, an arm portion, and a claw portion. In this example, the claw portion 420 is in the form of a clamp.

[0067] In the fourth embodiment, first, a belt-shaped pulling member A2 is used as the pulling member as shown in Fig. 13A, and then, the belt-shaped pulling member A2 is wound around the electrode body holder 50 as shown in Figs. 13A and 13B.

[0068] 14A, the end portion (here, corresponding to A2e) of the pulling member A2 is placed inside the claw portion 420. Then, as shown in FIGS. 14B and 14C, both end portions of the pulling member A2 are gripped by the claw portions 420. Then, the electrode body 20 is inserted into the case main body 12 while pulling the end portion of the pulling member A2.

[0069] Next, as shown in FIGS. 15A and 15B, the end of the pulling member A2 is hooked into a recess 80 provided in the second cover 14b. In this case, as shown in FIGS. 16A and 16B, when the second cover 14b and the case main body 12 are fitted together, the pulling member A2 naturally bends. This allows the end of the pulling member A2 to be accommodated in the internal space of the battery case 10 without being pinched by the fitting portion. That is, by providing a recess 80 on the inside of the second cover 14b and hooking and fitting the pulling member A2 into the recess 80, it is possible to suitably prevent the pulling member A2 from being pinched by the fitting portion. The shape of the recess 80 may be rectangular as in this embodiment, or may be various shapes such as a cylindrical shape or a polygonal prism shape. The size of the recess 80 is preferably determined appropriately depending on the size of the pulling member A2. The recess 80 can be formed, for example, by cutting the second cover 14b. In another embodiment, a protrusion may be provided on the second cover 14b instead of the recess 80, and the end of the pulling member A2 may be hooked on the protrusion. For the subsequent steps, the description of the first embodiment can be referred to.

[0070] FIG. 17A is a schematic diagram showing a state before the pulling member A2 is gripped by the claw portion 420 according to the fifth embodiment. FIGS. 17B and 17C are first and second schematic diagrams, respectively, showing a state after the pulling member A2 is gripped by the claw portion 420 according to the fifth embodiment. For clarity, the positive electrode tab 23 and the positive electrode current collector 32 are omitted from FIGS. 17A to 17C. In the fifth embodiment, as shown in FIG. 19A, both ends of the strip-shaped pulling member A2 are disposed deep within the claw portion 420. Then, as shown in FIGS. 19B and 19C, when the pulling member A2 is gripped, it is clamped deeply to a position where tension is applied to tighten the electrode assembly 20. In this manner, by tightening the pulling member A2 and pulling the electrode assembly 20, pulling can be performed in a more stable state.

[0071] 18A and 18B are first and second schematic diagrams illustrating a state in which the pulling member A1 is hooked onto the cutout portion 90 of the insulating film 50A according to the sixth embodiment. For clarity, the insulating member 60, the first cover 14a, and the negative electrode terminal 40 are omitted from FIG. 18A. In the sixth embodiment, as shown in FIG. 18A, an insulating film 50A having a cutout portion 90 on the rear end P side in the insertion direction of the electrode assembly 20 is used as the insulating film. Then, in the insertion step S6, the pulling member A1 is wound around the electrode assembly 20 so that the pulling member A1 is hooked onto the cutout portion 90. Then, as shown in FIG. 18B, the electrode assembly 20 is inserted into the case main body 12 by pulling the pulling member A1. By arranging the pulling member A1 so that the pulling member A1 is hooked onto the cutout portion 90 of the insulating film 50A, the arrangement position of the pulling member A1 is stabilized. This allows the electrode body 20 to be inserted into the case body 12 more smoothly.

[0072] For example, in the above embodiment, the pulling member A1 is wrapped around one electrode body 20 and inserted into the case body 12, but this is not limited thereto. In other embodiments, a plurality of electrode bodies (electrode body elements) may be stacked and a pulling member may be wrapped around them and inserted into the case body. In the present disclosure, the term "electrode body" refers not only to one electrode body (electrode body element) but also to a plurality of electrode bodies (electrode body elements) stacked one on top of another. Furthermore, "wrapping the pulling member around the electrode body so as to align with the rear end portion P and the pair of side surfaces in the insertion direction of the electrode body" may also include a mode in which the pulling member A1 is wrapped around the electrode body 20 so as to align directly with the rear end portion P and the pair of side surfaces 20a in the insertion direction of the electrode body 20, or a mode in which another member (here, the insulating film 50) is interposed between the electrode body 20 and the pulling member A1, as in the first embodiment. Alternatively, a mode in which the electrode body 20 and another member (e.g., a spacer) are wrapped together may also be included.

[0073] As described above, specific aspects of the technology disclosed herein include those described in the following sections.

[0074] Section 1: a case body preparation step of preparing a rectangular cylindrical case body having openings on both sides in the length direction; an electrode body preparation step of preparing an electrode body to be housed in the case body; an insertion step of inserting the electrode body into the case body from one opening of the case body; Including, The case body includes: A pair of opposing side walls The electrode body is a pair of side surfaces that face the pair of side walls when housed in the case body; The inserting step includes: Prepare the towing member, the traction member is wound around the electrode body so as to be aligned with a rear end portion of the electrode body in the insertion direction and the pair of side surfaces; With the end of the pulling member positioned forward in the insertion direction, the electrode body is inserted into one opening of the case body; The electrode body is inserted into the case body while pulling the end of the pulling member. A method for manufacturing an electricity storage device.

[0075] Section 2: the electrode assembly includes a first electrode and a second electrode, a first electrode tab extending from the first electrode at a rear end in the insertion direction of the electrode body; Item 2. The method for manufacturing an electricity storage device according to item 1, wherein in the inserting step, the pulling member is wound around the electrode body so as to avoid the first electrode tab.

[0076] Section 3: the electrode assembly includes a first electrode and a second electrode, a first lid preparing step of preparing a first lid having a first electrode terminal; a connecting step of electrically connecting the first electrode and the first electrode terminal; further comprising 3. The method for manufacturing an electricity storage device according to item 1 or 2, wherein the inserting step is performed in a state in which the first electrode and the first electrode terminal are connected to each other.

[0077] Section 4: Item 4. The method for producing an electricity storage device according to any one of Items 1 to 3, further comprising an insulating film disposing step of covering the electrode body with an insulating film.

[0078] Section 5: the insulating film has a notch on a rear end side in the insertion direction of the electrode body, 5. The method for manufacturing an electricity storage device according to item 4, wherein in the inserting step, the pulling member is wound around the electrode body so that the pulling member is caught in the notch.

[0079] Item 6: The pair of side surfaces of the electrode body are rectangular having long sides and short sides, 6. The method for producing an electricity storage device according to any one of items 1 to 5, wherein the ratio of the length of the long side to the length of the short side (long side length / short side length) is 1.5 or more and 4 or less. [Explanation of symbols]

[0080] 10 Battery case 12 Case body 13 Gas exhaust valve 14 Lid 15 Liquid injection hole 16 Sealing member 20 Electrode body 21 Positive electrode 22 Negative electrode 26 Separator 30 Positive terminal 32 Positive electrode current collector 40 Negative terminal 42 Negative electrode current collector 50 insulating film 60 Insulating material 100 batteries 200 Electrode body insertion device 210 Arm 220 Claw A1, A2 traction members

Claims

1. a case body preparation step of preparing a rectangular cylindrical case body having openings on both sides in the length direction; an electrode body preparation step of preparing an electrode body to be housed in the case body; an insertion step of inserting the electrode body into the case body from one opening of the case body; Including, The case body includes: A pair of opposing side walls The electrode body is a pair of side surfaces that face the pair of side walls when housed in the case body; The inserting step includes: Prepare the towing member, the traction member is wound around the electrode body so as to be aligned with a rear end portion of the electrode body in the insertion direction and the pair of side surfaces; With the end of the pulling member positioned forward in the insertion direction, the electrode body is inserted into one opening of the case body; The electrode body is inserted into the case body while pulling the end of the pulling member. A method for manufacturing an electricity storage device.

2. the electrode assembly includes a first electrode and a second electrode, a first electrode tab extending from the first electrode at a rear end in the insertion direction of the electrode body; The method for manufacturing an electricity storage device according to claim 1 , wherein in the inserting step, the pulling member is wound around the electrode body so as to avoid the first electrode tab.

3. the electrode assembly includes a first electrode and a second electrode, a first lid preparing step of preparing a first lid having a first electrode terminal; a connecting step of electrically connecting the first electrode and the first electrode terminal; further comprising The method for manufacturing an electricity storage device according to claim 1 , wherein the inserting step is performed in a state where the first electrode and the first electrode terminal are connected to each other.

4. The method for manufacturing an electricity storage device according to claim 1 , further comprising an insulating film disposing step of covering the electrode body with an insulating film.

5. the insulating film has a notch on a rear end side in the insertion direction of the electrode body, The method for manufacturing an electricity storage device according to claim 4 , wherein in the inserting step, the pulling member is wound around the electrode body so that the pulling member is caught in the notch portion.

6. The pair of side surfaces of the electrode body are rectangular having long sides and short sides, The method for manufacturing an electricity storage device according to claim 1 , wherein a ratio of the length of the long side to the length of the short side (long side length / short side length) is 1.5 or more and 4 or less.

Images