power storage module

Abstract

Provided are: at least one cylindrical power storage device (20); and an upper holder (30) that holds an upper end side of the power storage device, a positive electrode terminal (26) and a negative electrode terminal (25C) being disposed at an upper end portion of the power storage device, the negative electrode terminal being disposed at a position that is more outward in a radial direction of the power storage device than the positive electrode terminal, and a negative electrode lead (50) that is connected to the negative electrode terminal from an outer side in the radial direction, the upper holder having a restriction portion (34) that is located at a position that is more inward in the radial direction than at least a portion of the negative electrode lead.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a power storage module. BACKGROUND

[0002] In the past, a power storage module has been known as a power source having a plurality of power storage devices. For example, the power storage module disclosed in Patent Literature 1 has a plurality of cylindrical batteries. In the cylindrical battery, a grommet is configured as a positive electrode terminal and an outer can is configured as a negative electrode terminal, and a negative electrode lead is joined at a shoulder portion (a riveted opening end portion) of the outer can.

[0003] PRIOR ART DOCUMENTS

[0004] PATENT LITERATURE

[0005] Patent Literature 1: International Publication No. 2019 / 058938 SUMMARY

[0006] PROBLEMS TO BE SOLVED BY THE INVENTION

[0007] In the power storage module described above, when the negative electrode lead is welded to the shoulder portion of the outer can, in the case where the negative electrode lead protrudes to the radially inner side of the outer can, there is a concern that the insulation distance of the negative electrode lead from the grommet cannot be ensured. On the other hand, in order to ensure the insulation distance of the negative electrode lead from the grommet, in the case where the radial length of the joining region of the negative electrode lead and the outer can is reduced, it is difficult to ensure a sufficient joining region for joining.

[0008] An object of the present disclosure is to provide a power storage module capable of ensuring the insulation distance of the positive electrode of a power storage device from a negative electrode lead and capable of ensuring the joining region of the negative electrode of the power storage device from the negative electrode lead.

[0009] MEANS FOR SOLVING THE PROBLEMS

[0010] The power storage module according to one embodiment of the present disclosure has at least one cylindrical power storage device, and a holder that holds one side of the power storage device, a first terminal and a second terminal are disposed at the end portion of the one side of the power storage device, the second terminal is disposed at a position more outward in the radial direction of the power storage device than the first terminal, and a lead is connected to the second terminal from the radially outer side, and the holder has a restriction portion at a position radially inward of at least a part of the lead.

[0011] EFFECTS OF THE INVENTION

[0012] According to one embodiment of the present disclosure, it is possible to suppress the contact of the positive electrode of the power storage device with the negative electrode lead. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is a side sectional view showing a power storage module as one example of an embodiment.

[0014] Figure 2 It is Figure 1 The detailed diagram is extracted from part A and represented.

[0015] Figure 3 This is a plan view of the upper cage as seen from below.

[0016] Figure 4 It is Figure 3 The detailed drawing (top view) is extracted from part B and represented.

[0017] Figure 5 From Figure 4 A three-dimensional view of the lower side of part B.

[0018] Figure 6 This is a three-dimensional view of the upper cage housing and negative lead, viewed from above.

[0019] Figure 7 This is a side sectional view of the upper cage.

[0020] Figure 8 This is a perspective view of the upper cage of the energy storage module as another example of the implementation method, viewed from above.

[0021] Figure 9 yes Figure 7 CC section view.

[0022] Figure 10 This is a top view showing the negative lead of an energy storage module, which is another example of an implementation method.

[0023] Figure 11 yes Figure 10 A three-dimensional image. Detailed Implementation

[0024] The embodiments of this disclosure are described below using the accompanying drawings. The shapes, materials, and quantities described below are examples and can be appropriately changed according to the specifications of the energy storage module.

[0025] use Figure 1 The energy storage module 10, which is one example of an implementation method, will be described. Figure 1 This is a side sectional view showing the energy storage module 10. Hereinafter, with regard to the energy storage module 10 and the energy storage device 20, the side of the energy storage device 20 held by the upper retainer 30 as the upper side in the vertical direction will be described. However, the upper retainer 30 side may also be the lower side of the energy storage module 10.

[0026] The electricity storage module 10 is mainly used as a power source for power. The electricity storage module 10 is used, for example, as a power source for an electrically driven device such as an electric automobile, an electric tool, an electrically assisted automobile, an electric bicycle, an electric wheelchair, an electric tricycle, an electric truck, or the like, which is driven by a motor. The electricity storage module 10 is not limited to the above-described uses, and can be used, for example, as a power source for various electric appliances such as a cleaner, a wireless device, an illuminating device, a digital camera, a video camera, or the like, which is used indoors or outdoors.

[0027] In Figure 1 , the electricity storage module 10 includes a plurality of cylindrical electricity storage devices 20, an upper holder 30 that holds upper end sides of the plurality of electricity storage devices 20, a lower holder 40 that holds lower end sides of the plurality of electricity storage devices 20, a first current collector (not shown) that forms a positive electrode lead that is connected to first terminals (positive electrode terminals) of the electricity storage devices 20, and a second current collector (not shown) that forms a negative electrode lead 50 that is connected to second terminals (negative electrode terminals) of the electricity storage devices 20. The upper holder 30 and the negative electrode lead 50 will be described later in detail. Figure 2

[0028] Using Figure 2 , the electricity storage device 20 will be described. Figure 2 is a detailed view of A portion of FIG. 1. Hereinafter, each component will be described with respect to the radial direction and the circumferential direction of the cylindrical shape of the electricity storage device 20. Figure 1

[0029] The electricity storage device 20 uses a cylindrical lithium ion secondary battery. The electricity storage device 20 is not limited to a lithium ion secondary battery, and can be a nickel-hydrogen battery, a capacitor, or the like.

[0030] As will be described later in detail, the electricity storage device 20 is provided with a positive electrode terminal that is a first terminal at an upper end portion, and a negative electrode terminal that is a second terminal. The negative electrode terminal is disposed at a position that is more radially outward than the positive electrode terminal. More specifically, the positive electrode terminal is formed on a top surface of a sealing body 26 that will be described later. In addition, the negative electrode terminal is formed on a riveted open end portion (hereinafter, shoulder portion 25C) of an outer can 25 that will be described later.

[0031] The electricity storage device 20 has, for example, an electrode group 24 in which a positive electrode 21 and a negative electrode 22 in a strip shape are wound with a separator 23 in a strip shape interposed therebetween, an outer can 25 that collectively houses the electrode group 24 and an electrolyte, a sealing body 26 that seals an opening of the outer can 25 in an insulating state, a positive electrode tab 27 that electrically connects the positive electrode 21 and the sealing body 26, and a negative electrode tab (not shown) that electrically connects the negative electrode 22 and the outer can 25. A gasket 28 that is insulating is disposed between an outer periphery of the sealing body 26 and an inner peripheral surface of the opening of the outer can 25.

[0032] ​​An annular groove 25A is formed on the outer peripheral surface of the outer can 25, on the opening side. An annular protrusion 25B is formed on the corresponding inner peripheral surface of the outer can 25. A gasket 28 and a sealing body 26 are disposed within the outer can 25 on the annular protrusion 25B. Further, the shoulder 25C of the outer can 25 is riveted to tilt inwards with the gasket 28 disposed on its inner peripheral side. Through the riveted shoulder 25C and protrusion 25B, the sealing body 26 is clamped in the vertical direction via the gasket 28, thereby sealing the opening of the outer can 25. Alternatively, the shoulder 25C need not have the structure described above. For example, a terminal plate may be provided at the center of the sealing body 26, with a conductive joint disposed on the outermost periphery of the sealing body 26 in an insulated state. The opening of the outer can 25 is sealed by welding the opening end to this joint. At this time, the negative lead 50 can also be connected to the top surface of the joint.

[0033] A current cut-off mechanism (CID) and an exhaust valve that ruptures when the pressure inside the outer can 25 exceeds a specified level can also be provided in the sealing body 26. Furthermore, an insulating plate 29 for insulating the electrode assembly 24 from the outer can 25 can be provided between the electrode assembly 24 and the protrusion 25B. With the insulating plate 29 provided, the positive electrode contact 27 can also extend through the through-hole formed in the insulating plate 29. Further, an insulating plate for insulating the electrode assembly 24 from the outer can 25 can also be provided between the electrode assembly 24 and the bottom of the outer can 25. Even if the negative electrode contact passes through the through-hole formed in the insulating plate, it can wrap around the insulating plate and extend.

[0034] In the energy storage device 20, as described above, the positive terminal is formed on the top surface of the sealing body 26 and is connected to the positive lead wire connected to the positive current collector foil. Furthermore, in the energy storage device 20, as described above, the negative terminal is formed on the riveted shoulder 25C of the outer can 25, and the negative terminal tab connected to the negative current collector foil is connected to the bottom of the outer can 25. The negative lead wire 50 is connected to the shoulder 25C of the outer can 25 from the radially outer side of the energy storage device 20.

[0035] use Figures 3 to 7 The upper retainer 30 will be explained. Figure 3 This is a plan view of the upper cage 30 viewed from below. Figure 4 It is Figure 3 The detailed drawing (plan view) is extracted from part B and represented. Figure 5 Viewed from below Figure 4 A three-dimensional view of part B. Figure 6 This is a perspective view of the housing section 31 of the upper retainer 30 as viewed from above. Figure 7 This is a side sectional view of the upper retainer 30.

[0036] The upper holder 30 is a member that holds the upper end side of the plurality of power storage devices 20. The upper holder 30 is formed of a thermoplastic resin. As the thermoplastic resin, there are general-purpose plastics and engineering plastics, and polyethylene, polypropylene, polyamide, ABS, and the like are used. The first current collector and the second current collector can be arranged side by side on the top surface of the upper holder 30 in a direction in which the first current collector and the second current collector extend on the top surface of the upper holder 30. The first current collector has a plurality of positive electrode lead wires that electrically connect the plurality of power storage devices 20, and the second current collector has a negative electrode lead wire that connects the negative electrode terminals of the plurality of power storage devices 20 and electrically connects the plurality of power storage devices 20. In addition, the first current collector and the second current collector can be stacked on each other with an insulating plate interposed therebetween.

[0037] In Figure 3 , a plurality of accommodation portions 31 that accommodate the upper end side of each of the power storage devices 20 are formed on the bottom surface of the upper holder 30. By fitting the upper end side of the power storage device 20 in the accommodation portion 31, the upper end side of the power storage device 20 is held to the upper holder 30.

[0038] In Figures 4 to 7 , the accommodation portion 31 is formed on the bottom surface of the upper holder 30 as a recess portion that includes a ceiling portion 31A having a bottom surface that opposes the upper end surface of the power storage device 20 and a wall portion 31B having an inner circumferential surface that opposes the side circumferential surface of the power storage device 20.

[0039] Around the accommodation portion 31, an opening portion 32 that exposes the top surface of the sealing body 26 of the power storage device 20 on the upper surface of the upper holder 30, a cutout portion 33 that exposes the shoulder portion 25C of the outer can 25 of the power storage device 20 from the upper surface of the upper holder 30, and a restriction portion 34 that is located at a position that is more inward than at least a portion of the negative electrode lead wire 50 in the radial direction of the power storage device 20 are formed.

[0040] The opening portion 32 is a portion in which the ceiling portion 31A of the accommodation portion 31 is circularly opened. The diameter of the opening portion 32 is formed to be smaller than the inner diameter of the wall portion 31B. Through the opening portion 32, the top surface of the sealing body 26 of the power storage device 20 is exposed from the upper surface of the upper holder 30. Therefore, the top surface of the sealing body 26 can be engaged with the positive electrode lead wire via the opening portion 32. In addition, the bottom portion of the ceiling portion 31A can also abut against the power storage device 20.

[0041] The cutout portion 33 is a portion in which a part of the edge portion of the opening portion 32 is cut. Through the cutout portion 33, a part of the shoulder portion 25C of the outer case 25 of the electricity storage device 20 can be exposed from the upper surface of the upper holder 30. It is preferable that the edge portion of the cutout portion 33 in the upper surface of the upper holder 30 be formed so as to have a slope that descends more toward the inner side in the radial direction of the electricity storage device 20. Thereby, it is possible to reduce the pressure applied to the negative electrode lead 50 when the negative electrode lead 50 is bent and brought into abutment with the shoulder portion 25C. Thus, it is possible to make the jig or the like that engages the negative electrode lead 50 with the shoulder portion 25C of the outer case 25 approach the negative electrode lead 50, and improve workability. Further, the top surface of the restriction portion 34 can also be at a position lower than the top surface of the region of the upper holder 30 in which the cutout portion 33 is formed. With this structure, it is possible to more easily house the negative electrode lead 50 within the cutout portion 33.

[0042] The restriction portion 34 is a portion that is located, in the radial direction of the electricity storage device 20, at a position more inward than at least a part of the negative electrode lead 50. In other words, the restriction portion 34 is a portion that restricts movement of the negative electrode lead 50 inward of a prescribed position in the above-described radial direction. The prescribed position is preferably the inner end position (the opening end position of the outer case 25) in the radial direction of the shoulder portion 25C of the outer case 25 of the electricity storage device 20. However, in the present application, through the above-described restriction portion 34, it is also possible for not all of the negative electrode lead 50 to be located in the shoulder portion 25C (outside the top surface of the seal body). It is also possible for a part of the negative electrode lead 50 to overlap with the top surface of the seal body without abutment. Further, of course, a structure in which the negative electrode lead 50 is housed in the window formed by the restriction portion 34 and the cutout portion 33 is included.

[0043] The restriction portion 34 is formed so as to be located inward in the radial direction of the cutout portion 33, and so as to be a surface that spans both sides in the circumferential direction of the cutout portion 33 (the portion that connects both ends of the cutout portion 33 in the ceiling portion 31A). It is also possible for the negative electrode lead 50 to be engaged with the shoulder portion 25C of the outer case 25 in a state in which the outer side surface 34A of the restriction portion 34 and the negative electrode lead 50 abut against each other or are slightly separated in the radial direction of the electricity storage device 20.

[0044] Through the restriction portion 34, the negative electrode lead 50 is restricted to be located at a position more outward than the prescribed position in the radial direction, and thus it is possible to ensure the insulation distance of the top surface of the seal body 26 of the electricity storage device 20 (the positive electrode terminal) from the negative electrode lead 50. Further, in the case in which a conductive foreign object intrudes from the outside of the upper holder 30, it is possible to reduce the risk of short circuit of the top surface of the seal body 26 and the negative electrode lead 50 caused by the foreign object or the like.

[0045] Further, by the restriction portion 34, it is possible to ensure the insulation distance from the top surface of the sealing body 26, and therefore it is possible to reduce the radial length of the negative electrode lead 50 without taking into account the insulation distance from the top surface of the sealing body 26, and it is possible to make the radial length of the negative electrode lead 50 sufficiently large. Thus, it is possible to ensure the engagement area of the negative electrode lead 50 with the shoulder portion 25C (negative electrode terminal) of the outer can 25 of the power storage device 20.

[0046] The restriction portion 34 has an inclined portion 34B formed from the upper surface to the outer side surface 34A and falling in the radial direction of the power storage device 20 so as to decrease toward the outer side. By the inclined portion 34B, when the negative electrode lead 50 is brought into abutment with the shoulder portion 25C in order to engage the negative electrode lead 50 with the shoulder portion 25C, it is easy to house the negative electrode lead 50 in the cutout portion 33 using an engagement tool or a jig, or the like.

[0047] Further, the restriction portion 34 has a bottom surface 34C, which can also abut against the power storage device 20. Thus, it is possible to prevent the negative electrode lead 50 or a foreign object from intruding into the lower side of the restriction portion 34, that is, the gap between the power storage device 20 and the restriction portion 34. Further, the bottom surface 34C can also abut against the shoulder portion 25C. With this structure, in the power storage device 20, the area exposed from the cutout portion 33 is only the shoulder portion 25C. Therefore, compared with a structure in which the restriction portion 34 is located more inward in the radial direction of the power storage device 20 than the shoulder portion 25C, it is possible to further suppress the short circuit of the negative electrode lead 50.

[0048] In the Figures 4 to 7 In the wall portion 31B of the housing portion 31, a pressing portion 35 that presses the side peripheral surface of the power storage device 20 toward the side on which the restriction portion 34 is formed, and a support portion 36 that supports the side peripheral surface of the power storage device 20 are formed.

[0049] By the pressing portion 35 and the support portion 36, in the housing portion 31 of the upper holder 30, the power storage device 20 is pressed toward the side on which the support portion 36 is formed in the radial direction, and it is possible to absorb the dimensional deviation in the radial direction of the upper holder 30 and the power storage device 20, and the relative positional deviation of the upper holder 30 and the power storage device 20, and it is possible to bias the power storage device 20 in the direction in which the pressing portion 35 presses. Therefore, it is possible to suppress the shoulder portion 25C from not sufficiently being exposed from the window divided by the cutout portion 33 and the restriction portion 34 due to the dimensional tolerance of the power storage device 20 and the upper holder 30, and the assembly tolerance. Also, it is possible to suppress the poor engagement of the shoulder portion 25C and the negative electrode lead 50 due to the insufficient exposure amount. In addition, even if there is only the pressing portion 35 without the support portion 36, compared with a structure without the pressing portion 35, it is possible to suppress the deviation of the exposure amount of the shoulder portion 25C from the cutout portion 33.

[0050] The pressing portion 35 is a portion that presses the side peripheral surface of the outer case 25 of the electric storage device 20 toward the side in the circumferential direction in which the restricting portion 34 is formed. The electric storage device 20 is pressed toward the side in the radial direction in which the restricting portion 34 and the supporting portion 36 are formed by the pressing portion 35. Therefore, the pressing portion 35 and the restricting portion 34 can be arranged on opposite sides of each other with the electric storage device 20 interposed therebetween. However, if a force that presses the restricting portion 34 is generated, the pressing portion 35 can not necessarily be arranged at a position symmetrical with respect to the central axis of the upper holder 30.

[0051] The pressing portion 35 is formed so as to extend and project downward from a ceiling surface of a recessed portion 35A formed at an edge portion of the wall portion 31B of the housing portion 31. Therefore, the pressing portion 35 is positioned within the recessed portion 35A or adjacent to the recessed portion 35A. By the above-described structure, the pressing portion formed in the upper holder 30 can be easily formed integrally. Further, a through-hole can be formed at a position most adjacent to the pressing portion 35 on the upper surface of the upper holder 30 when the upper holder 30 is viewed in plan. By the through-hole, the pressing portion 35 can be easily formed integrally when the pressing portion 35 is formed using a metal mold. A protruding portion 35B that protrudes toward the inner side in the radial direction of the electric storage device 20 is provided at the front end portion of the pressing portion 35. The protruding portion 35B is formed so as to protrude more inward in the radial direction than the wall portion 31B of the housing portion 31 when viewed in plan. Further, a plurality of pressing portions 35 can be provided for one housing portion 31.

[0052] The supporting portion 36 is a portion that supports the side peripheral surface of the outer case 25 of the electric storage device 20 at substantially the same position in the circumferential direction as the restricting portion 34. The supporting portion 36 is formed in a groove shape along the vertical direction of the wall portion 31B of the housing portion 31. In the supporting portion 36, the side peripheral surface of the electric storage device 20 is supported by the abutment of the opening edge portion of the groove shape of the wall portion 31B of the housing portion 31. At this time, the curvature of the inner peripheral surface of the wall portion 31B and the curvature of the side peripheral surface of the electric storage device 20 can be different. By the difference in curvature, the portion of the electric storage device 20 housed in the supporting portion 36 can more reliably abut against the opening edge portion. As a method of making the curvatures different, for example, the diameter of the inner peripheral surface of the wall portion 31B and the diameter of the side peripheral surface of the electric storage device 20 can be made different.

[0053] The supporting portion 36 is not limited to the groove shape along the vertical direction. For example, the supporting portion 36 can be formed as protruding portions such as two ribs that protrude inward from the wall portion 31B of the housing portion 31 and are formed along the vertical direction. In this case, the side peripheral surface of the outer case 25 of the electric storage device 20 is supported by the abutment of each of the protruding portions and the side peripheral surface of the electric storage device 20. Further, a plurality of supporting portions 36 can be provided at the wall portion 31B. Further, the plurality of supporting portions 36 can not be positioned at substantially the same position in the circumferential direction of the electric storage device. The plurality of supporting portions 36 can be separated from each other in the circumferential direction.

[0054] Using Figure 8 and Figure 9 An upper holder 60 of the electricity storage module 10 as another example of an embodiment will be described. Figure 8 is a perspective view of the housing portion 61 of the upper holder 60 viewed from the upper side. Figure 9 is Figure 7 a DD cross-sectional view of the upper holder 60. In Figure 9 , the shape of the electricity storage device 20 is omitted.

[0055] As described above, the upper holder 30 is a member that holds the upper end side of the plurality of electricity storage devices 20. In the upper holder 60, the portions other than the restriction portion 64 are the same structure as the upper holder 30 described above, and thus only the restriction portion 64 will be described below. Specifically, the housing portion 61, the opening portion 62, the cutout portion 63, the pressing portion 65, and the support portion 66 formed in the upper holder 60 are the same structure as the housing portion 31, the opening portion 32, the cutout portion 33, the pressing portion 35, and the support portion 36 formed in the upper holder 30 described above.

[0056] The restriction portion 64 is located at a position that is more inward in the radial direction of the electricity storage device 20 than at least a portion of the negative electrode lead 50. In other words, the restriction portion 64 restricts movement of the negative electrode lead 50 to a position that is more inward than a prescribed position in the radial direction. The prescribed position is preferably the inner end position of the shoulder portion 25C of the outer can 25 (the opening end position of the outer can 25) in the radial direction of the electricity storage device 20.

[0057] In Figure 8 and Figure 9 , the restriction portion 64 is formed so as to extend and protrude from one ceiling portion 61A of the cutout portion 63 formed inward in the radial direction of the cutout portion 63. In other words, the restriction portion 64 is formed as a cantilever with a free end at the front end portion of the cutout portion 63. It is preferable that the gap between the front end portion of the restriction portion 64 and the other ceiling portion 61A be smaller than the length of the restriction portion 64.

[0058] It is also possible for the outer side surface 64A of the restriction portion 64 and the front end portion 50A of the negative electrode lead 50 (see Figure 6 ) to abut against each other or for the negative electrode lead 50 to be engaged with the shoulder portion 25C of the outer can 25 in a state of being slightly separated in the radial direction of the electricity storage device 20.

[0059] By the restriction portion 64, as with the restriction portion 34 described above, it is possible to secure the insulation distance between the top surface (positive electrode) of the grommet 26 of the electricity storage device 20 and the negative electrode lead 50 and to secure the engagement area of the negative electrode lead 50 with the shoulder portion 25C (negative electrode) of the outer can 25 of the electricity storage device 20.

[0060] The restriction portion 64 has an inclined portion 64B formed from the upper surface to the outer side surface 64A. Thereby, the negative electrode lead 50 is easily housed in the cutout portion 33 using a jig or the like that engages the negative electrode lead 50 and the shoulder portion 25C of the exterior can 25 at the time of engagement.

[0061] Further, the restriction portion 64 has a bottom surface 64C that is inclined downward toward the front end side. The restriction portion 64 is formed such that the position in the vertical direction of the bottom surface 64C of the front end side of the restriction portion 64 is positioned more downward than the position in the vertical direction of the ceiling portion 61A. Thereby, the restriction portion 64 abuts against the ceiling of the power storage device 20. Therefore, it is possible to suppress the negative electrode lead 50 from intruding between the restriction portion 64 and the power storage device 20 by the restriction portion 64.

[0062] For example, in the case where the relative position of the power storage device 20 and the upper holder 60 is shifted due to dimensional tolerance of the shape of the power storage device 20 or the upper holder 60, or assembly tolerance, and a gap is generated between the power storage device 20 and the ceiling portion 61A of the upper holder 60, since the position in the vertical direction of the bottom surface 64C of the front end side of the restriction portion 64 is positioned more downward than the position in the vertical direction of the ceiling portion 61A, the bottom surface 64C of the restriction portion 64 abuts against the power storage device 20, and it is possible to prevent the negative electrode lead 50 from intruding downward of the restriction portion 64.

[0063] On the other hand, in the case where no gap is generated between the power storage device 20 and the ceiling portion 61A of the upper holder 60, since the restriction portion 64 is formed so as to extend and protrude from one ceiling portion 61A, the front end side of the restriction portion 64 is in a state of being slightly curved upward, and the bottom surface 64C of the restriction portion 64 abuts against the power storage device 20, and it is possible to prevent the negative electrode lead 50 from intruding downward of the restriction portion 64. In addition, in the restriction portion 64, the bottom surface 64C of the front end portion side protrudes downward. However, it is also possible for the bottom surface 64C of the root portion side of the restriction portion 64 to protrude downward. Further, if the restriction portion 64 is curved, it is also possible for the entire bottom surface 64C of the restriction portion 64 to protrude without being biased toward the front end side or the root portion side. Further, if the restriction portion 64 is curved, it is also possible for the restriction portion 64 not to be cantilevered as the restriction portion 64, but to be a shape that supports both ends.

[0064] Use Figure 10 and Figure 11 The negative electrode lead 70 of the power storage module 10 as another example of the embodiment will be described. Figure 10 is a plan view that shows the negative electrode lead 70. Figure 11 is Figure 10 a perspective view of the negative electrode lead 70.

[0065] As described above, the negative lead 70 is the portion connected to the shoulder 25C (negative terminal) of the outer casing 25 of the energy storage device 20 as viewed from the cutout 33 of the upper retainer 30. The negative lead 70 can be applied to either the energy storage module 10 with the upper retainer 30 or the energy storage module 10 with the upper retainer 60, but the following description will focus on an example applied to the energy storage module 10 with the upper retainer 30.

[0066] exist Figure 10 as well as Figure 11 In this device, the negative lead 70 has: a joint 71 that engages with the shoulder 25C (negative terminal) of the outer casing 25 of the energy storage device 20, and a connecting portion 72 that connects the joint 71 to the main body (not shown) of the second current collector. The joint 71 includes wall portions 71A formed at both ends of the energy storage device 20 in the circumferential direction (generally the direction intersecting the radial direction). The wall portions 71A are formed, for example, by bending. The wall portions 71A can also engage other components with the two ends of the connecting portion 72 in the circumferential direction. Furthermore, the vertical dimension of the wall portions 71A can be lower than the height protruding from the cutout 33 on the top surface of the upper retainer 60. In addition, even if the vertical dimension of the wall portions 71A is smaller than the gap between the energy storage device 20 and the limiting portion 64, the possibility of entering the gap can be reduced compared to a joint without wall portions 71A. Furthermore, if the vertical dimension of the wall portions 71A is larger than the gap, the possibility of entering the gap can be reduced even more significantly.

[0067] For example, even if a gap is generated between the top portion 31A of the energy storage device 20 and the upper retainer 30 due to the relative positional offset caused by the dimensional tolerance of the shape of the energy storage device 20 or the upper retainer 30, or the assembly tolerance of the energy storage device 20 and the upper retainer 30, the size (height) of the negative lead 70 in the vertical direction increases through the wall portion 71A, thus preventing the negative lead 70 from entering the gap.

[0068] On the other hand, it is also considered to bend the front end (radial inner end side) of the joint 71 to form a wall at the front end of the joint 71. However, when a positive current collector foil containing a positive lead and a negative current collector foil containing a negative lead 70 are made from a single metal foil by punching, the front end of the joint 71 of the negative lead 70 is often close to the front end of the positive lead in the metal foil before punching. In such cases, it may be difficult to form a wall at the front end of the joint 71.

[0069] Therefore, by bending at least one end of the joint 71 in the circumferential direction (generally speaking, the direction intersecting the radial direction) to form the wall portion 71A, it is possible to prevent the negative lead 70 from penetrating below the restricting portion 34.

[0070] In addition, the present application is not limited to the above-described embodiments and modified examples thereof, and various changes and improvements can of course be made within the scope of the matters described in the claims of the present application.

[0071] -Explanation of Symbols-

[0072] 10 storage module, 20 storage device, 21 positive electrode, 22 negative electrode, 23 separator, 24 electrode group, 25 outer can, 25A groove portion, 25B protrusion portion, 25C shoulder portion, 26 sealing body, 27 positive electrode tab, 28 gasket, 29 insulating plate, 30 upper holder, 31 housing portion, 31A ceiling portion, 31B wall portion, 32 opening portion, 33 cutout portion, 34 restriction portion, 34A outer side surface, 34B inclined portion, 34C bottom surface, 35 pressing portion, 35A recessed portion, 35B protrusion portion, 36 support portion, 40 lower holder, 50 negative electrode lead wire, 50A front end portion, 60 upper holder, 61A ceiling portion, 63 cutout portion, 64 restriction portion, 64A outer side surface, 64B inclined portion, 64C bottom surface, 70 negative electrode lead wire, 71 joint portion, 71A wall portion, 72 connection portion.

Claims

1. An electricity storage module comprising: at least one cylindrical electricity storage device; and a holder that holds one side of the electricity storage device, wherein a first terminal and a second terminal are disposed at an end of the one side of the electricity storage device, the second terminal is disposed at a position further outward in a radial direction of the electricity storage device than the first terminal, the electricity storage module further comprises a lead wire connected to the second terminal from an outer side in the radial direction, the holder has a restriction portion at a position inward in the radial direction than at least a part of the lead wire, the restriction portion is a portion that restricts movement of the lead wire inward of a prescribed position in the radial direction, and the lead wire is bent in a height direction of the electricity storage device, and a bent portion of the lead wire extends in a direction intersecting the radial direction of the electricity storage device.

2. The electricity storage module according to claim 1, wherein the holder has an opening portion that exposes the first terminal, and a cutout portion that is formed around the opening portion and exposes the second terminal, and the restriction portion is formed with both ends supported in the cutout portion.

3. The electricity storage module according to claim 1 or 2, wherein the holder has a pressing portion that presses a side peripheral surface of the electricity storage device toward the one side where the restriction portion is provided.

4. The electricity storage module according to claim 3, wherein the pressing portion includes a protruding portion that abuts against the side peripheral surface of the electricity storage device.

5. The electricity storage module according to claim 3 or 4, wherein the pressing portion is located in or adjacent to a recess portion formed by a wall portion of a housing portion of the holder that houses the electricity storage device.

6. The electricity storage module according to claim 3, wherein the holder has a support portion that supports the side peripheral surface of the electricity storage device.

7. The electricity storage module according to claim 6, wherein the support portion is a groove portion formed by a surface of the holder that opposes the side peripheral surface of the electricity storage device.

8. The electricity storage module according to claim 1, wherein a bottom portion of the restriction portion abuts against the second terminal.

9. The electricity storage module according to claim 1, wherein the electricity storage module has an inclined portion that extends from a top surface of the restriction portion to an outer side surface.

10. The electricity storage module according to claim 2, wherein a top surface of the restriction portion is at a position lower than a top surface of the cutout portion of the holder.

11. The electricity storage module according to claim 1, wherein the electricity storage device comprises: an electrode body that includes a first electrode and a second electrode; an outer can that houses the electrode body together with an electrolyte, and has a cylindrical cylinder portion whose one end is open; and a seal body that plugs the open one end of the outer can together with an insulating gasket, wherein the seal body is electrically connected to the first electrode, the outer can is electrically connected to the second electrode, an end portion of the outer can is bent inward in a radial direction of the outer can and abuts against an outer peripheral edge of the seal body via the gasket, the first terminal is the seal body, and the second terminal is the end portion of the outer can. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

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