JP2017010790A - Method for manufacturing power storage device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to precisely block a gap between an electrode assembly and an inner surface of a case in an electrode lamination direction.SOLUTION: Provided is a method of manufacturing a secondary battery 10 in which an electrode assembly 14 in which a positive electrode 15 and a negative electrode 16 having an active material layer formed thereon are laminated in a state where a separator 17 is interposed is accommodated in a case 11. The method includes a thickness measuring step of measuring the thickness of the electrode assembly 14 including the positive electrode 15, the separator 17, and the negative electrode 16, a gap filling material manufacturing step of manufacturing a sheet-like space filling material 33 on the basis of the measured thickness of the electrode assembly 14, and an adjusting step of laminating the space filling material 33 on the electrode assembly 14.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method for manufacturing a power storage device.

  Power storage devices such as secondary batteries and capacitors are widely used as power sources because they can be recharged and can be used repeatedly. For example, as a power storage device mounted on a vehicle such as an EV (Electric Vehicle) or a PHV (Plug-in Hybrid Vehicle), a lithium ion secondary battery, a nickel hydride secondary battery, or the like is well known. And the electrical storage apparatus was laminated | stacked so that the sheet-like positive electrode with which the active material layer was formed in the electrical power collector (for example, metal foil), and the sheet-like negative electrode may form a layer in the state in which a separator exists An electrode assembly is provided.

  By the way, particularly in a power storage device using a square case, an appropriate number of thin sheet-like insulating gaps are filled in the gap between the inner surface of the case and the electrode assembly accommodated in the case. The gap is closed by inserting a material (thickness adjusting film).

  For example, in Patent Document 1, an insulating film that separates the exterior case and the electrode body is disposed between the inner wall surface of the exterior case that houses the electrode body (electrode assembly) and the flat surface of the electrode body, This insulating film is formed in a bag shape into which the electrode body is inserted. The bag-like insulating film includes a gap filling portion that closes a gap between the electrode body and the inner wall surface of the outer case on a surface facing the flat surface of the electrode body. The gap filling portion is configured by joining one or a plurality of sheet-like gap filling members formed in a sheet shape having a predetermined thickness. Further, when the plurality of sheet-like gap filling members are welded and integrated with each other in advance before being joined to the bag-like insulating film, it is easy to carry and weld the bag-like insulating film. Is also described.

JP 2009-48966 A

  When a plurality of sheet-like gap filling members are welded and integrated with each other in advance before being joined to the bag-like insulating film as in Patent Document 1, transport and welding operations to the bag-like insulating film are facilitated. . However, as in Patent Document 1, in the method using a number of sheet-like gap filling members that match the size of the gap between the inner wall surface of the exterior case and the flat surface of the electrode body, the integrated sheet-like gap filling The thickness of the member can be adjusted only by the thickness unit of one sheet-like gap filling member.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a method of manufacturing a power storage device that can close the gap between the electrode assembly and the inner surface of the case in the electrode stacking direction with high accuracy. There is.

  A method for manufacturing a power storage device that solves the above problem is a method for manufacturing a power storage device in which an electrode assembly in which a positive electrode and a negative electrode on which an active material layer is formed is stacked with a separator interposed therebetween is housed in a case. Is the method. Then, a thickness measuring step for measuring the thickness of the electrode assembly comprising the positive electrode, the separator and the negative electrode, and a gap filler manufacturing method for manufacturing a sheet-like gap filler based on the measured thickness of the electrode assembly And an adjustment step of laminating the gap filler on the electrode assembly.

  According to this configuration, the thickness of the electrode assembly is measured, and based on the measurement result, a thickness suitable for closing the gap between the case inner surface and the electrode assembly when the electrode assembly is housed in the case. A gap filler is produced. The gap filler is laminated on the electrode assembly. That is, unlike the case of using a sheet-like gap filler with a certain thickness as in the prior art by joining a number of sheets having a thickness close to the size of the gap between the inner surface of the case and the electrode assembly, the gap filler is used. The thickness of is a value suitable for closing the gap between the inner surface of the case and the electrode assembly. Therefore, the gap between the electrode assembly and the case inner surface in the electrode stacking direction can be closed with high accuracy.

  The method for manufacturing the power storage device includes: a fixing step in which a stacked body in which the positive electrode and the negative electrode are stacked with the separator interposed therebetween is fixed to form the electrode assembly; and the electrode assembly after fixing An assembly step of connecting a solid body to a lid-side structure including electrode terminals, and an insertion step of inserting the electrode assembly connected to the lid-side structure into a case body, wherein the gap filler is The electrode assembly is preferably laminated after the assembly step. Here, the “laminated body” is not limited to a so-called wound type as in the case of a so-called laminated electrode assembly, in which a plurality of rectangular positive electrodes and negative electrodes are laminated with a separator in between. As in the case of a revolving electrode assembly, the belt-shaped positive electrode and the negative electrode are laminated with a separator between them, and are also wound.

  The gap filler can be laminated on the electrode assembly at any time after the electrode assembly is formed and before the electrode assembly is inserted into the case body. However, if the gap filler is stacked on the electrode assembly after the assembly step, the gap filler is stacked until the gap filler is inserted into the case body in a state of being stacked on the electrode assembly. Since there is almost no operation for moving the assembly, fixing between the gap filler and the electrode assembly can be omitted or simplified, which is preferable.

  The gap filler manufacturing process includes a hot press process in which a resin sheet is pressed under heating to obtain a gap filler of a desired thickness, and the gap between the press rolls used in the hot press is measured by the measurement process. It may be determined based on the result. Here, the “target thickness” means a thickness suitable for the gap filler to close the gap between the case inner surface and the electrode assembly.

  In this configuration, a resin sheet thicker than the maximum value of the gap between the inner surface of the case and the electrode assembly is prepared in advance, and the resin sheet is pressed by a hot press using a press roll to obtain a gap filler having a desired thickness. Is formed. Since the thickness of the gap filler to be formed is determined based on the measurement result of the measurement process, it is a value suitable for closing the gap between the case inner surface and the electrode assembly.

  The gap filler manufacturing step includes a molding step of molding a resin sheet by injection molding. In the molding step, a mold capable of adjusting the thickness of the resin sheet is used, and the gap of the measurement step is used in the gap of the mold. The measurement result may be reflected.

  In this configuration, a resin sheet serving as a material for the gap filler is formed by injection molding, and the resin sheet is pressed by hot pressing using a press roll to form a gap filler having a desired thickness. When the resin sheet is injection-molded, the measurement result of the measurement process is reflected in the gap of the mold, so that a resin sheet having a thickness suitable for obtaining a gap filler having a target thickness by hot pressing can be obtained.

  According to the present invention, the gap between the electrode assembly and the inner surface of the case in the electrode stacking direction can be closed with high accuracy.

The typical exploded perspective view of the rechargeable battery of a 1st embodiment. The schematic diagram of a gap filler manufacturing apparatus. The front view of a roll press apparatus. (A) is a schematic diagram of a cutting device, (b) is a schematic diagram explaining a cutting action. The partial fracture | rupture schematic diagram of the injection molding apparatus used for 2nd Embodiment. The schematic plan view of the cutting device of another embodiment. (A), (b) is a schematic diagram of the roll press apparatus of another embodiment.

(First embodiment)
Hereinafter, a first embodiment embodied in a method for producing a secondary battery (lithium ion secondary battery) as a power storage device will be described with reference to FIGS.

  As shown in FIG. 1, the secondary battery 10 includes a stacked-type electrode assembly 14 and an electrolyte solution (not shown) in a rectangular box-shaped case 11 constituted by a case body 12 and a lid 13 covering the opening. Is housed. The electrode assembly 14 includes a laminated body 18 in which a positive electrode 15 and a negative electrode 16 each having an active material layer formed on at least one surface of a current collector (metal foil) are laminated with a separator 17 in between. Both the case main body 12 and the lid 13 are made of metal (for example, made of stainless steel or aluminum).

  Each positive electrode tab 19 is joined to the positive electrode conductive member 20 while being welded to each other. A positive electrode terminal 21 as an electrode terminal for transferring electricity to and from the electrode assembly 14 is joined to the positive electrode conductive member 20. The positive electrode terminal 21 has a positive electrode terminal portion 22 whose first end protrudes from the hole 13 a of the lid 13 and a positive electrode terminal base 23 welded to the positive electrode conductive member 20, and the male screw portion 22 a of the positive electrode terminal portion 22 is a positive electrode. It is integrated by being screwed into the female screw portion 23a of the terminal block 23.

  Each negative electrode tab 24 is joined to the negative electrode conductive member 25 while being welded to each other. A negative electrode terminal 26 as an electrode terminal for transferring electricity to and from the electrode assembly 14 is joined to the negative electrode conductive member 25. The negative electrode terminal 26 has a negative electrode terminal portion 27 whose first end protrudes from the hole 13 a of the lid 13 and a negative electrode terminal base 28 welded to the negative electrode conductive member 25, and the male screw portion 27 a of the negative electrode terminal portion 27 is a negative electrode. The terminal block 28 is integrated by being screwed into the female screw portion 28a.

  The positive electrode terminal 21 is attached to the lid 13 by being fastened and fixed by a nut 30 while penetrating through a hole 13 a formed in the lid 13 and an insulating ring 29 that insulates the positive electrode terminal 21 and the case 11. . The negative electrode terminal 26 is fastened and fixed by a nut 30 and attached to the lid 13 while penetrating through a hole 13 a formed in the lid 13 and an insulating ring 29 that insulates the negative electrode terminal 26 and the case 11. .

  A large number of positive electrodes 15, negative electrodes 16 and separators 17 constituting the electrode assembly 14 are mutually connected by a tape 31 affixed to the upper end of the laminate 18 and a tape 32 affixed to the bottom end. It is fixed.

  The electrode assembly 14 closes the gap between the surface in the stacking direction of the stacked body 18 and the inner surface 12a of the case main body 12 with a single sheet-like gap filler 33 overlapped, and the outer side is covered with an insulating film. The cover 34 is inserted into the case main body 12 so as to be accommodated in the case main body 12. The insulating film 34 is made of a resin material such as polypropylene and has a size capable of covering the front surface, the back surface, both side surfaces, and the bottom surface of the laminate 18.

Next, a manufacturing method of the secondary battery 10 configured as described above will be described along manufacturing steps.
The manufacturing process of the secondary battery 10 mainly includes an electrode manufacturing process for manufacturing the positive electrode 15 and the negative electrode 16, and an assembling process for assembling the secondary battery 10 using the manufactured positive electrode 15 and negative electrode 16. The assembling process further includes a laminating process in which the positive electrode 15 and the negative electrode 16 are laminated together with the separator to form the laminated body 18, a fixing process in which the laminated body 18 is fixed after being pressed to form the electrode assembly 14, and an electrode assembly. A measurement process for measuring the thickness of the electrode 14, an assembly process for connecting the fixed electrode assembly 14 to a lid-side structure (lid sub-assembly) including electrode terminals (the positive electrode terminal 21 and the negative electrode terminal 26), and a lid-side structure And an insertion step of inserting the electrode assembly 14 connected to the body into the case 11, more precisely, the case main body 12.

  In addition, the method for manufacturing the secondary battery 10 newly includes a gap filler manufacturing process for molding the gap filler 33 into a predetermined shape. In addition, after the gap filler 33 is molded, there is a thickness adjusting step for laminating the gap filler 33 on the electrode assembly 14 before the electrode assembly 14 is inserted into the case body 12.

  Of the secondary battery manufacturing methods, the gap filler manufacturing process for manufacturing the sheet-like gap filler 33 is different from the conventional secondary battery manufacturing method, and the other processes are performed in known processes. Therefore, the gap filler manufacturing process will be described.

The gap filler manufacturing process is performed based on the result of the measurement process for measuring the thickness of the electrode assembly 14.
As shown in FIG. 2, the gap filler manufacturing process is performed using a gap filler manufacturing apparatus that manufactures a sheet-like gap filler. The gap filler manufacturing apparatus includes a supply reel 40, a support roll 42 that guides the resin sheet 41 sent out from the supply reel 40, a roll press apparatus 43, a cutting apparatus 44, and the manufactured gap filler 33. And a transport device 45 for transporting.

  The roll press device 43 includes a movable press roll 43a and a fixed press roll 43b, and the interval between the press rolls 43a and 43b can be changed to a target value by an interval changing means (not shown). The roll press device 43 is configured to be able to press the resin sheet 41 in a heated state.

  Measurement data of the thickness of the electrode assembly 14 measured in the thickness measurement step is input to the control device 46 that controls the interval changing means. In the state where the electrode assembly 14 having the thickness measured in the thickness measurement process is accommodated in the case 11, the control device 46 is configured so that the gap between the press rolls 43 a and 43 b of the roll press device 43 is accommodated in the case 11. The interval changing means is controlled so as to have a value suitable for closing the gap with the solid 14. That is, the gap filler manufacturing process includes a hot pressing process in which the resin sheet 41 is pressed under heating to obtain a gap filler 33 having a desired thickness, that is, a desired thickness, and both press rolls used for hot pressing. The gaps 43a and 43b are determined based on the measurement result of the measurement process.

  As shown in FIG. 3, the movable press roll 43a includes flange portions 43c at both ends, and the length of the fixed press roll 43b is set to be equal to the interval between the flange portions 43c. The flange portion 43c plays a role of preventing the resin sheet 41 from extending in the width direction when the roll press device 43 presses the resin sheet 41.

  As shown in FIGS. 4 (a) and 4 (b), the cutting device 44 is provided with rolls 44a and 44b having the same diameter so that they can be rotated at regular intervals. One roll 44a is provided with a linear blade portion 44c in parallel with the axial direction, and the other roll 44b avoids interference with the blade portion 44c and is jointed with the blade portion 44c at one position in the resin sheet 41. A recess 44d (shown only in FIG. 4B) is provided so that can be cut. The protruding amount of the blade portion 44c from the surface of the roll 44a is set to be equal to or greater than the thickness of the resin sheet 41 having the maximum thickness. Therefore, the cutting device 44 can cut the resin sheets 41 having different thicknesses while keeping the distance between the axes of both rolls 44a and 44b constant. The cutting device 44 cuts the resin sheet 41 into a certain length, and the gap filler 33 is manufactured. The diameters of both rolls 44 a and 44 b are set in accordance with the target length of the gap filler 33. In addition, illustration of the rotating shaft which both the rolls 44a and 44b have is abbreviate | omitted in Fig.4 (a).

  The gap filler 33 produced by cutting the resin sheet 41 into a certain length by the cutting device 44 is adsorbed by an adsorption device (not shown) while being conveyed by the conveyance device 45 and laminated on the electrode assembly 14. It is transferred to the position where it is done.

  Then, after the gap filler 33 is laminated on the electrode assembly 14, the electrode assembly 14 is inserted into the case body 12 while being covered with the insulating film 34 together with the gap filler 33. In this embodiment, after the laminated body 18 is fixed with the tapes 31 and 32, the electrode assembly 14 is connected to the lid-side structure including the electrode terminals (the positive terminal 21 and the negative terminal portion 27), and then the gap Filler 33 is laminated. The insulating film 34 is folded so as to be able to cover the front surface, the back surface, both side surfaces, and the bottom surface except the upper surface of the electrode assembly 14, and is formed into a bottomed rectangular tube shape. The material 33 is covered.

  The electrode assembly 14 supports the lid 13 in a state where it is connected to the lid-side structure, and the case body 12 is positioned relative to the electrode assembly 14 in a state where the electrode assembly 14 is disposed above the case body 12. By being moved, it is inserted into the case main body 12 together with the gap filler 33 and the insulating film 34.

According to this embodiment, the following effects can be obtained.
(1) A method of manufacturing a power storage device in which an electrode assembly 14 in which a positive electrode 15 and a negative electrode 16 on which an active material layer is formed is stacked in a state where a separator 17 exists is housed in a case 11. And the thickness filling process which measures the thickness of the electrode assembly 14 which consists of the positive electrode 15, the separator 17, and the negative electrode 16, and manufactures the sheet-like gap filler 33 based on the measured thickness of the electrode assembly 14 A material manufacturing process and an adjustment process of laminating the gap filler 33 on the electrode assembly 14.

  According to this configuration, the thickness of the electrode assembly 14 is measured, and based on the measurement result, the gap between the case inner surface and the electrode assembly 14 in a state where the electrode assembly 14 is accommodated in the case 11 is blocked. A single gap filler 33 of suitable thickness is produced. Then, the gap filler 33 is laminated on the electrode assembly 14. That is, unlike the case of using a sheet-like gap filling material having a constant thickness as in the prior art by joining a number of sheets having a thickness close to the size of the gap between the case inner surface and the electrode assembly 14, the gap filling is performed. The thickness of the material 33 is a value suitable for closing the gap between the case inner surface and the electrode assembly 14. Therefore, the gap between the electrode assembly 14 and the case inner surface in the electrode stacking direction can be closed with high accuracy.

  (2) The manufacturing method of the secondary battery 10 includes a fixing step of fixing the laminated body 18 to form the electrode assembly 14, and the electrode assembly 14 after fixing includes electrode terminals (a positive terminal 21 and a negative terminal 26). An assembly process for connecting to the lid-side structure, and an insertion process for inserting the electrode assembly 14 connected to the lid-side structure into the case body 12, and the gap filler 33 is an electrode after the assembly process. Laminate on the assembly 14. The gap filler 33 can be laminated on the electrode assembly 14 at any time after the electrode assembly 14 is formed and before the electrode assembly 14 is inserted into the case body 12. However, if the gap filler 33 is laminated on the electrode assembly 14 connected to the lid-side structure as in the above-described embodiment, the gap filler 33 and the electrode assembly 14 are not fixed with tape. Or, it is preferable because simple fixing is sufficient. When an assembly process or the like is performed in a state where the gap filler 33 is laminated on the electrode assembly 14, the gap filler 33 and the electrode assembly are prevented so that the gap filler 33 does not come off as the electrode assembly 14 moves. 14 must be firmly fixed with a tape or the like. However, in this embodiment, since there is almost no operation | work to move between an adjustment process from an adjustment process, firm fixation is not required. In addition, the gap filler manufacturing process takes a longer time than a conventional sheet-like gap filler having a predetermined thickness prepared in advance, but in the above-described embodiment, it is parallel to the assembly process. Therefore, an increase in cycle time can be suppressed.

  (3) The gap filler manufacturing process includes a hot press process in which the resin sheet 41 is pressurized under heating to obtain a gap filler 33 having a target thickness, and a press roll (movable press roll 43a) used for the hot press. And the gap between the fixed press rolls 43b) is determined based on the measurement result of the measurement process. In this configuration, a resin sheet 41 thicker than the maximum value of the gap between the inner surface of the case and the electrode assembly 14 is prepared in advance, and the resin sheet 41 is pressed by a hot press using a press roll to have a target thickness. A gap filler 33 is formed. Since the thickness of the gap filler 33 to be formed is determined based on the measurement result of the measurement step, the thickness is a value suitable for closing the gap between the case inner surface and the electrode assembly 14.

  (4) The gap filler manufacturing apparatus presses the resin sheet 41 prepared in advance to a target thickness without increasing the width, and then cuts the sheet to a certain length to manufacture the gap filler 33. Therefore, the gap filler 33 can be manufactured without waste from the raw material resin sheet 41.

(Second Embodiment)
Next, a second embodiment will be described with reference to FIG. In the second embodiment, the resin sheet 41 as a material of the gap filler 33 is not prepared in advance, but after the measurement result of the thickness of the electrode assembly 14 is obtained, the resin sheet 41 is formed by injection molding. The point of molding is greatly different from that of the first embodiment. The same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  The gap filler manufacturing process includes a molding process of molding the resin sheet 41 by injection molding. In the molding process, a mold capable of adjusting the thickness of the resin sheet 41 is used, and the measurement result of the measurement process is applied to the gap of the mold. To reflect. And the resin sheet 41 shape | molded at the formation process is heat-pressed with the roll press apparatus 43 similarly to 1st Embodiment, Then, it cut | disconnects with the cutting device 44. FIG.

  As shown in FIG. 5, the mold of the injection molding apparatus 50 that manufactures the resin sheet 41 includes a fixed mold 51 and a movable mold 52, and the fixed mold 51 and the movable mold 52 are The thickness of the cavity 53 as a gap provided between the two can be changed. Then, in a state in which the thickness of the cavity 53 is adjusted to a thickness suitable for manufacturing the resin sheet 41 having a thickness suitable for the thickness of the electrode assembly 14 measured in the measurement process, a mold from an injection device (not shown) is used. The resin sheet 41 is manufactured by supplying the resin.

  In the first embodiment, the resin sheet 41 is a long resin sheet having a thickness equal to or greater than the maximum value of the gap between the case inner surface and the electrode assembly so that a large number of gap fillers 33 can be formed. Commercial products or outsourced products are used. However, in this embodiment, the resin sheet 41 has only to be long enough to obtain the gap filler 33 for one sheet.

  In the configuration of the second embodiment, a resin sheet 41 that is a material of the gap filler 33 is formed by injection molding, and the resin sheet 41 is pressed by a hot press using a press roll to obtain a target thickness. The gap filler 33 is formed. When the resin sheet 41 is injection-molded, the measurement result of the measurement process is reflected in the gap of the mold, so that the resin sheet 41 having a thickness suitable for obtaining the gap filler 33 having a desired thickness is obtained by hot pressing. It is done.

The embodiment is not limited to the above, and may be embodied as follows, for example.
The roll press device 43 does not need to have the flange part 43c in any of the movable press roll 43a and the fixed press roll 43b. In this case, since the length of the pressed resin sheet 41 changes not only in the length direction but also in the width direction, in order to obtain the target gap filler 33, not only in the length direction but also in the width direction. Need to cut. In this case, a cutting device that cuts both end portions in the width direction of the resin sheet 41 fed from the roll press device 43 is provided between the roll press device 43 and the cutting device 44. And the resin sheet 41 after the both ends of the width direction are cut | disconnected by the cutting device 44 is cut | disconnected by fixed length.

  As shown in FIG. 6, as a method of cutting the width direction and the length direction of the resin sheet 41 sent out from the roll press device 43 into a predetermined length, instead of providing independent cutting devices, the resin sheet 41 The blade portion 55a having the same length in the width direction and the blade portion 55b having the same length in the length direction may be cut by a cutting blade 55 provided so as to form a rectangular shape. For example, the cutting auxiliary stand 56 is disposed below the cutting blade 55 with the resin sheet 41 interposed therebetween, and the cutting blade 55 is configured to be movable in the vertical direction by a lifting means (not shown). And in the state which stopped the resin sheet 41 on the cutting assistance stand 56 intermittently, the cutting blade 55 is moved down to the position which presses the stopped resin sheet 41, and it cut | disconnects.

  As shown to Fig.7 (a), (b), it is good also as a structure which can cut | disconnect the resin sheet 41 after pressing a roll press apparatus. Specifically, the movable press roll 43a and the fixed press roll 43b do not have a constant radius, and the movable press roll 43a is formed with a blade portion 47 protruding in part. On the other hand, the fixed press roll 43 b is formed with a recess 48 that avoids interference with the blade portion 47. And the resin sheet 41 is cut | disconnected until it moves to the state shown in FIG.7 (b) through the state shown to Fig.7 (a).

  ○ In the gap filler manufacturing process, after manufacturing the gap filler 33 for the electrode assembly 14 whose thickness is measured in the measurement process, the gap filler 33 is not immediately stacked on the corresponding electrode assembly 14. After a predetermined number of gap fillers 33 are manufactured, the gap fillers 33 may be sequentially stacked on the electrode assembly 14. In this case, the measurement of the thickness of the new electrode assembly 14 is performed after the manufacture of the gap filler 33 for the electrode assembly 14 for which the previous thickness was measured, and the manufacture of the new gap filler 33 is performed the previous time. Unlike the case where the gap filling material 33 is laminated after the lamination to the electrode assembly 14 is completed, each process may be performed efficiently regardless of the status of the next process. Therefore, even if the total time is the same, the number of secondary batteries 10 manufactured within a certain time can be increased.

  O Instead of the roll-type cutting device 44 that cuts the resin sheet 41, a cutting device that cuts with two blades like scissors may be adopted. In this case, the resin sheet 41 is cut with the movement of the resin sheet 41 partially stopped.

  The electrode assembly 14 is not limited to a laminated electrode assembly, but is a wound type in which a strip-like positive electrode and a strip-like negative electrode are wound through a strip-like separator to form a flat laminate. It may be an electrode assembly.

  In the case of the stacked electrode assembly 14, a bag-shaped separator is used as the separator 17. And the separator 18 which accommodated any one electrode of the positive electrode 15 and the negative electrode 16 and the other electrode may be laminated | stacked alternately, and the laminated body 18 may be comprised.

  The resin sheet 41 that is the material of the gap filler 33 may be porous like a separator. In this case, even if neither the movable press roll 43a nor the fixed press roll 43b of the roll press device 43 is provided with the flange portion 43c, the resin sheet 41 can be reduced in thickness without becoming wide.

  The time when the gap filling material 33 is stacked on the electrode assembly 14 is not limited to after the electrode assembly 14 is connected to the lid-side structure, but may be after the electrode assembly 14 is formed. For example, the laminated body 18 may be laminated on the electrode assembly 14 immediately after being fixed with the tapes 31 and 32.

The gap filler 33 is not limited to the inside of the insulating film 34, and may be accommodated in the case 11 in a state of being outside the insulating film 34.
The insulating film 34 is not essential, and a case in which an insulating layer is formed on the inner surface 12a of the case main body 12 is used. You may accommodate in the case 11 in the state which contacts 14 outer surface.

  The positive electrode terminal 21 is not limited to a configuration in which the positive electrode terminal portion 22 having the male screw portion 22a is screwed into and integrated with the female screw portion 23a of the positive electrode terminal base 23 joined to the positive electrode conductive member 20, for example, a lid A structure in which a rod-shaped conductor having a male thread portion protruding from the thirteen holes 13 a is welded to the positive electrode conductive member 20 may be employed. Similarly, the negative electrode terminal 26 may have a structure in which a rod-shaped conductor having an external thread protruding from the hole 13 a of the lid 13 is welded to the negative electrode conductive member 25.

The secondary battery 10 is not limited to a lithium ion secondary battery, and may be another secondary battery such as a nickel hydrogen secondary battery or a nickel cadmium secondary battery.
The power storage device is not limited to the secondary battery 10 and may be a capacitor such as an electric double layer capacitor or a lithium ion capacitor.

  DESCRIPTION OF SYMBOLS 11 ... Case, 12 ... Case main body, 14 ... Electrode assembly, 15 ... Positive electrode, 16 ... Negative electrode, 17 ... Separator, 18 ... Laminate, 33 ... Gap filler, 41 ... Resin sheet, 43a ... Movable press roll, 43b ... fixed press roll, 51 ... fixed side mold constituting the mold, 52 ... movable side mold constituting the mold.

Claims (4)

A method of manufacturing a power storage device in which an electrode assembly in which a positive electrode and a negative electrode on which an active material layer is formed is stacked in a state where a separator exists is housed in a case,
A thickness measuring step for measuring a thickness of an electrode assembly comprising the positive electrode, the separator and the negative electrode;
Based on the measured thickness of the electrode assembly, a gap filler manufacturing process for manufacturing a sheet-like gap filler,
An adjustment step of laminating the gap filler on the electrode assembly;
The manufacturing method of the electrical storage apparatus which has this. The method for manufacturing the power storage device includes:
A fixing step of fixing the stacked body in which the positive electrode and the negative electrode are stacked in a state where the separator is present between the positive electrode and the negative electrode;
An assembly step of connecting the electrode assembly after fixing to a lid-side structure including electrode terminals;
Inserting the electrode assembly connected to the lid-side structure into a case body, and
The method for manufacturing a power storage device according to claim 1, wherein the gap filler is laminated on the electrode assembly after the assembly step.   The gap filler manufacturing process includes a hot press process in which a resin sheet is pressed under heating to obtain a gap filler of a desired thickness, and the gap between the press rolls used in the hot press is measured by the measurement process. The manufacturing method of the electrical storage apparatus of Claim 1 or Claim 2 determined based on a result.   The gap filler manufacturing step includes a molding step of molding a resin sheet by injection molding. In the molding step, a mold capable of adjusting the thickness of the resin sheet is used, and the gap of the measurement step is used in the gap of the mold. The manufacturing method of the electrical storage apparatus of Claim 1 or Claim 2 in which a measurement result is reflected.