power storage module

Abstract

A battery device includes at least one cylindrical battery, an upper bracket that holds an upper end side of the battery, a positive terminal disposed at an upper end of the battery, a negative terminal disposed at an outer side than the positive terminal in a radial direction of the battery, and a negative lead connected to the negative terminal from an outer side in the radial direction. The upper bracket has a restriction portion that is located inward of at least a portion of the negative lead in the radial direction. A bottom surface of the restriction portion protrudes downward more than a surface of the upper bracket that opposes an end portion of one side of the battery.

Description

TECHNICAL FIELD

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

[0002] Conventionally, a power storage module is 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 sealing body 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 to the shoulder portion (the opening end portion after caulking) 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 between the negative electrode lead and the sealing body cannot be maintained. On the other hand, in the case where the radial length of the joining region of the negative electrode lead and the outer can is reduced in order to maintain the insulation distance between the negative electrode lead and the sealing body, it is difficult to secure a sufficient joining region for joining.

[0008] Therefore, it is considered that a restriction portion that is located radially inward of at least a part of the lead is formed in an upper bracket that holds the upper end portion of the power storage device. However, in the case where a gap is generated between the power storage device and the upper bracket due to a dimensional tolerance of the shape of the power storage device or the upper bracket or a positional deviation of the power storage device and the upper bracket relative to each other, there is a concern that the negative electrode lead penetrates below the restriction portion.

[0009] An object of the present disclosure is to provide a power storage module in which a restriction portion that is located radially inward of at least a part of the lead is formed in an upper bracket, and penetration of the negative electrode lead below the restriction portion can be suppressed.

[0010] MEANS FOR SOLVING THE PROBLEMS

[0011] A power storage module according to one embodiment of the present disclosure has at least one cylindrical power storage device and a bracket 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 radially outward of the first terminal, a lead is connected to the second terminal from the radially outer side, the bracket has a restriction portion that is located radially inward of at least a part of the lead, and the bottom surface of the restriction portion protrudes downward more in the bracket than a surface that opposes the end surface of the one side of the power storage device.

[0012] Invention Effects

[0013] According to one aspect of this disclosure, the upper support can be formed to restrict the negative lead to be located further outward than a given radial position, and to prevent the negative lead from penetrating downward into the restriction portion. Attached Figure Description

[0014] Figure 1 This is a side sectional view showing an energy storage module as an example of an implementation.

[0015] Figure 2 It is extraction Figure 1 The detailed view shown in section A.

[0016] Figure 3 This is a plan view of the upper support from below.

[0017] Figure 4 It is extraction Figure 3 The detailed view (plan view) shown in section B.

[0018] Figure 5 Viewed from below Figure 3 A three-dimensional view of part B.

[0019] Figure 6 This is a three-dimensional view of the upper support housing and the negative lead wire, viewed from above.

[0020] Figure 7 This is a side sectional view of the upper support.

[0021] Figure 8 This is a perspective view of the upper support of the energy storage module as another example of the implementation method, viewed from above.

[0022] Figure 9 yes Figure 8 CC section view.

[0023] Figure 10 This is a plan view showing the negative lead of an energy storage module as another example of an implementation.

[0024] Figure 11 yes Figure 10 A three-dimensional image. Detailed Implementation

[0025] The embodiments of this disclosure will now be described 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.

[0026] use Figure 1 An example of an implementation method, the energy storage module 10, will be described. Figure 1is a side sectional view showing the power storage module 10. Hereinafter, the power storage module 10 and the power storage device 20 will be described with the upper side of the upper bracket 30, which is a bracket, holding one side of the power storage device 20, as the upper side in the vertical direction. However, the upper bracket 30 side can also be the lower side of the power storage module 10.

[0027] The power storage module 10 is mainly used as a power source for power. The power storage module 10 is used, for example, as a power source for electric vehicles, electric tools, electric assist vehicles, electric two-wheelers, electric wheelchairs, electric three-wheelers, electric go-karts, and the like, which are driven by electric motors. However, the use of the power storage module 10 is not limited, and the power storage module 10 can also be used, for example, as a power source for various electric appliances such as cleaners, wireless devices, lighting devices, digital cameras, video cameras, and the like, which are used indoors and outdoors.

[0028] In Figure 1 , the power storage module 10 includes a plurality of cylindrical power storage devices 20, an upper bracket 30 that is a bracket holding the upper end side of each of the plurality of power storage devices 20, a lower bracket 40 that is a bracket holding the lower end side of each of the plurality of power storage devices 20, a first current collector (not shown) formed with a positive electrode lead connected to a first terminal (positive electrode terminal) of the power storage device 20, and a second current collector (not shown) formed with a negative electrode lead 50 connected to a second terminal (negative electrode terminal) of the power storage device 20. Details of the upper bracket 30 and the negative electrode lead 50 will be described later. Figure 2 ) of the power storage device 20.

[0029] The Figure 2 power storage device 20 will be described. Figure 2 is a detailed view of A portion of Figure 1 . Hereinafter, each member will be described in the radial direction and the circumferential direction of the cylindrical shape of the power storage device 20.

[0030] The power storage device 20 uses a cylindrical lithium ion secondary battery. The power storage device 20 is not limited to a lithium ion secondary battery, and can be a nickel-hydrogen battery, a capacitor, or the like.

[0031] Details of the power storage device 20 will be described later. The power storage device 20 is provided with a positive electrode terminal as a first terminal and a negative electrode terminal as a second terminal in the upper end portion, and the negative electrode terminal is disposed more radially outward than the positive electrode terminal. More specifically, the positive electrode terminal is formed on the top surface of a closure body 26 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 described later.

[0032] The power storage device 20 has, for example, an electrode group 24 obtained by winding a strip-shaped positive electrode 21 and a strip-shaped negative electrode 22 in a state where a strip-shaped separator 23 is interposed, a cylindrical exterior container 25 in which the electrode group 24 is housed together with an electrolyte, a sealing body 26 that seals the opening of the exterior container 25 in a state where the opening is insulated, a foil-shaped 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 exterior container 25. An insulating gasket 28 is disposed between the outer periphery of the sealing body 26 and the inner peripheral surface of the opening of the exterior container 25.

[0033] On the outer peripheral surface of the exterior container 25, an annular groove portion 25A is formed on the opening side. The groove portion 25A has an annular protrusion portion 25B formed in the corresponding inner peripheral surface of the exterior container 25. The gasket 28 and the sealing body 26 are disposed on the annular protrusion portion 25B in the exterior container 25. Further, the shoulder portion 25C of the exterior container 25 is riveted so as to be inclined toward the inside of the exterior container 25 in a state where the gasket 28 is disposed on the inner peripheral side. The opening of the exterior container 25 is sealed by sandwiching the sealing body 26 in the up-and-down direction by the shoulder portion 25C that is riveted and the protrusion portion 25B with the gasket 28 interposed therebetween. Note that the shoulder portion 25C need not necessarily have the above-described structure. For example, a terminal plate can be provided in the central portion of the sealing body 26, and a conductive engaging portion can be provided at the outermost periphery of the sealing body 26 in a state where the terminal plate is insulated. The opening of the exterior container 25 can be sealed by welding the opening end portion and the engaging portion. In this case, the negative electrode lead 50 can be connected to the top surface of the engaging portion.

[0034] A current interrupt device (CID) that breaks when a given pressure or more is reached in the interior of the exterior container 25 can be provided in the sealing body 26. Further, an insulating plate 29 that insulates the electrode group 24 and the exterior container 25 can be provided between the electrode group 24 and the protrusion portion 25B. In the case where the insulating plate 29 is provided, the positive electrode tab 27 can extend through a through-hole formed in the insulating plate 29. Further, an insulating plate that insulates the electrode group 24 and the exterior container 25 can be provided between the electrode group 24 and the bottom portion of the exterior container 25. The negative electrode tab can extend circuitously through the through-hole formed in the insulating plate even though the through-hole is formed in the insulating plate.

[0035] In the power storage device 20, the positive electrode terminal is formed on the top surface of the sealing body 26 as described above, and the positive electrode lead connected to the positive electrode current collecting foil is engaged. Further, in the power storage device 20, the negative electrode terminal is formed on the shoulder portion 25C of the exterior container 25 that is riveted, the negative electrode tab connected to the negative electrode current collecting foil is engaged, and the bottom portion of the exterior container 25 is engaged. The negative electrode lead 50 is engaged with the shoulder portion 25C of the exterior container 25 from the radially outer side of the power storage device 20.

[0036] Use Figures 3 to 7The upper holder 30 will be described. Figure 3 is a plan view of the upper holder 30 viewed from the lower side. Figure 4 is a detail view (plan view) of the B portion of Figure 3 . Figure 5 is a perspective view of the B portion of Figure 3 viewed from the lower side. Figure 6 is a perspective view of the housing portion 31 of the upper holder 30 viewed from the upper side. Figure 7 is a side sectional view of the upper holder 30.

[0037] 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 roughly classified into general-purpose plastics and engineering plastics, and polyethylene, polypropylene, polyamide, ABS, or the like is used. On the top surface of the upper holder 30, the first current collector and the second current collector can also be arranged in a direction in which the top surface of the upper holder 30 extends. It can also be that the first current collector has a plurality of positive electrode lead wires that electrically connect the plurality of power storage devices 20, and the negative electrode lead wire of the second current collector is connected to the negative electrode terminal of the plurality of power storage devices 20 to electrically connect the plurality of power storage devices 20. Further, the first current collector and the second current collector can also be stacked with each other with an insulating plate interposed.

[0038] In the upper holder 30, a plurality of housing portions 31 that house the upper end side of each of the power storage devices 20 are formed on the bottom surface. By fitting the upper end side of the power storage device 20 into the housing portion 31, the upper end side of the power storage device 20 is held to the upper holder 30. Figure 3 In the upper holder 30, a plurality of housing portions 31 that house the upper end side of each of the power storage devices 20 are formed on the bottom surface. By fitting the upper end side of the power storage device 20 into the housing portion 31, the upper end side of the power storage device 20 is held to the upper holder 30.

[0039] Figures 4 to 7 In the upper holder 30, a plurality of housing portions 31 that house the upper end side of each of the power storage devices 20 are formed on the bottom surface. By fitting the upper end side of the power storage device 20 into the housing portion 31, the upper end side of the power storage device 20 is held to the upper holder 30.

[0040] Around the housing portion 31, an opening portion 32 that exposes the top surface of the seal body 26 of the power storage device 20 from the upper surface of the upper holder 30, a notch 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 on the radial direction of the power storage device 20 inward of at least a part of the negative electrode lead wire 50 are formed.

[0041] The opening portion 32 is a portion in which the top plate portion 31A of the housing 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 seal 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 seal body 26 and the positive electrode lead wire can be engaged with each other with the opening portion 32 interposed. Further, the bottom portion of the top plate portion 31A can also abut against the power storage device 20.​

[0042] The notch portion 33 is a portion in which a part of the rim portion of the opening portion 32 is cut away. Through the notch portion 33, a part of the shoulder portion 25C of the exterior case 25 of the electrical storage device 20 can be exposed from the upper surface of the upper bracket 30. It is preferable that the rim portion of the notch portion 33 in the upper surface of the upper bracket 30 be formed with a sloped portion that descends more toward the inner side in the radial direction of the electrical storage device 20. Thereby, when the negative electrode lead 50 is bent to abut against the shoulder portion 25C, it is possible to reduce the stress applied to the negative electrode lead 50. Therefore, it is possible to bring the jig or the like that joins the negative electrode lead 50 and the shoulder portion 25C of the exterior case 25 closer to the negative electrode lead 50, improving workability. Further, the top surface of the restriction portion 34 can also be at a position lower than the top surface of the region in which the notch portion 33 in the upper bracket 30 is formed. With this structure, it is possible to more easily accommodate the negative electrode lead 50 in the notch portion 33.

[0043] The restriction portion 34 is, as described above, a portion that is located more inward in the radial direction of the electrical storage device 20 than at least a part of the negative electrode lead 50. In other words, the restriction portion 34 is a portion that restricts the negative electrode lead 50 from moving to a position more inward than a given position in the radial direction. The given position is preferably the inner end position in the radial direction of the shoulder portion 25C of the exterior case 25 of the electrical storage device 20 (the opening end position of the exterior case 25). However, in the present application, it is also possible that, through the restriction portion 34 described above, the entirety of the negative electrode lead 50 is not located in the shoulder portion 25C (outside the top surface of the seal). A part of the negative electrode lead 50 can also overlap without abutting against the top surface of the seal. Further, it goes without saying that the structure including the negative electrode lead 50 being accommodated in the window portion formed by the restriction portion 34 and the notch portion 33.

[0044] The restriction portion 34 is formed so as to be located inward in the radial direction of the notch portion 33 and so as to be disposed on the surfaces (the portions in the top plate portion 31A that connect both ends of the notch portion 33) on both sides in the circumferential direction of the notch portion 33. It is possible to join the negative electrode lead 50 and the shoulder portion 25C of the exterior 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 electrical storage device 20.

[0045] Through the restriction portion 34, the negative electrode lead 50 is restricted so as to be located outward from the given position in the radial direction, whereby it is possible to ensure the insulation distance of the top surface of the seal 26 of the electrical storage device 20 (the positive electrode terminal) and the negative electrode lead 50. Further, in the case in which a conductive foreign object intrudes from the outside of the upper bracket 30, it is possible to reduce the risk of short circuit of the top surface of the seal 26 and the negative electrode lead 50 caused by the foreign object or the like.

[0046] Further, by the restriction portion 34, it is possible to ensure the insulation distance from the top surface of the sealing body 26, and thus it is not necessary to reduce the radial length of the negative electrode lead 50 in consideration of the insulation distance from the top surface of the sealing body 26, and it is possible to sufficiently increase the radial length of the negative electrode lead 50. Thus, it is possible to ensure the engagement region 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.

[0047] The restriction portion 34 has an inclined portion 34B which is formed from the upper surface toward the outer side surface 34A, falls in the radial direction of the power storage device 20, and becomes lower as it goes 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, the negative electrode lead 50 is easily housed in the notch portion 33 using a jig or a clamp or the like.

[0048] Further, the restriction portion 34 can have a bottom surface 34C which is in abutment with the power storage device 20. Thus, it is possible to prevent the negative electrode lead 50 or a foreign object from penetrating into the lower side of the restriction portion 34, that is, into the gap between the power storage device 20 and the restriction portion 34. Further, the bottom surface 34C can be in abutment with the shoulder portion 25C. With this structure, in the power storage device 20, the region which is exposed from the notch portion 33 is only the shoulder portion 25C. Thus, by the shoulder portion 25C, compared with the structure in which the restriction portion 34 is on the inner side in the radial direction of the power storage device 20, it is possible to further suppress the short circuit of the negative electrode lead 50.

[0049] In the Figures 4 to 7 In the

[0050] By the pressing portion 35 and the support portion 36, in the housing portion 31 of the upper bracket 30, it is possible to press the power storage device 20 toward the side in the radial direction of the power storage device 20 on which the support portion 36 is formed, to absorb the dimensional fluctuation in the radial direction of the upper bracket 30 and the power storage device 20 and the positional deviation of the upper bracket 30 and the power storage device 20, and to shift the power storage device 20 in the direction in which it is pressed by the pressing portion 35. Thus, it is possible to suppress the case where the shoulder portion 25C does not sufficiently protrude from the window portion defined by the notch portion 33 and the restriction portion 34 due to the dimensional tolerance of the power storage device 20 and the upper bracket 30 and the assembly tolerance. Further, it is possible to suppress the poor engagement of the shoulder portion 25C and the negative electrode lead 50 due to the insufficient protrusion amount. In addition, even if there is only the pressing portion 35 without the support portion 36, compared with the structure without the pressing portion 35, it is possible to suppress the fluctuation in the protrusion amount of the shoulder portion 25C from the notch portion 33.

[0051] The pressing portion 35 is a portion that presses the side peripheral surface of the exterior case 25 of the electricity storage device 20 toward the side on which the restricting portion 34 is formed in the circumferential direction. The electricity storage device 20 is pressed toward the side on which the restricting portion 34 and the supporting portion 36 are formed in the radial direction by the pressing portion 35. Therefore, the pressing portion 35 and the restricting portion 34 can be arranged on opposite sides of the electricity storage device 20. However, the pressing portion 35 can not necessarily be arranged at a position symmetrical to the center axis of the upper bracket 30 with respect to the pressing force toward the restricting portion 34.

[0052] The pressing portion 35 is formed so as to extend downward from the top surface of the recessed portion 35A formed in the edge portion of the wall portion 31B of the housing portion 31. Thus, the pressing portion 35 is positioned in the recessed portion 35A or adjacent to the recessed portion 35A. With this structure, the pressing portion formed in the upper bracket 30 can be easily formed integrally. Further, a through hole can be formed in the upper surface of the upper bracket 30 at a position adjacent to the pressing portion 35 in a plan view of the upper bracket 30. With this through hole, the pressing portion 35 can be easily formed integrally when molding is performed using a mold. The front end portion of the pressing portion 35 has a protrusion 35B that protrudes toward the inner side in the radial direction of the electricity storage device 20. The protrusion 35B is formed so as to protrude more toward the inner side in the radial direction than the wall portion 31B of the housing portion 31 in a plan view. Further, a plurality of pressing portions 35 can be provided with respect to one housing portion 31.

[0053] The supporting portion 36 is a portion that supports the side peripheral surface of the exterior case 25 of the electricity storage device 20 at substantially the same position as the restricting portion 34 in the circumferential direction. The supporting portion 36 is formed as a groove shape in the wall portion 31B of the housing portion 31 along the vertical direction. In the supporting portion 36, the side peripheral surface of the exterior case 25 of the electricity 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 and the side peripheral surface of the electricity storage device 20. At this time, the curvatures of the inner peripheral surface of the wall portion 31B and the side peripheral surface of the electricity storage device 20 can be different. With this difference in curvature, the portion of the electricity storage device 20 accommodated in the supporting portion 36 can more reliably abut against the opening edge portion. As a method of making the curvatures different, for example, a case in which the diameter of the inner peripheral surface of the wall portion 31B and the diameter of the side peripheral surface of the electricity storage device 20 are made different can be given.

[0054] The supporting portion 36 is not limited to a groove shape along the vertical direction. For example, the supporting portion 36 can be formed as protrusions such as two ribs that protrude toward the inner side 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 exterior case 25 of the electricity storage device 20 is supported by the abutment of each of the protrusions and the side peripheral surface of the electricity storage device 20. Further, the supporting portion 36 can be provided at a plurality of positions in the wall portion 31B. Further, the supporting portions 36 can not be at substantially the same position in the circumferential direction of the electricity storage device. The supporting portions 36 can be spaced apart from each other in the above-described circumferential direction.

[0055] 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 accommodation portion 61 of the upper holder 60 viewed from the upper side. Figure 9 is Figure 7 a CC sectional view of the upper holder 60. In Figure 9 , the shape of the electricity storage device 20 is omitted.

[0056] 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 portion other than the restriction portion 64 is the same structure as the upper holder 30 described above, and thus only the restriction portion 64 will be described below. Specifically, the accommodation portion 61, the opening portion 62, the notch portion 63, the pressing portion 65, and the support portion 66 formed in the upper holder 60 are the same structure as the accommodation portion 31, the opening portion 32, the notch portion 33, the pressing portion 35, and the support portion 36 formed in the upper holder 30 described above.

[0057] The restriction portion 64 is located on the radially inner side of at least a portion of the negative electrode lead 50 with respect to the electricity storage device 20. In other words, the restriction portion 64 restricts the negative electrode lead 50 from moving radially inward of a given position. The given position is preferably the radially inner end position of the shoulder portion 25C of the outer can 25 (the opening end position of the outer can 25) of the electricity storage device 20.

[0058] In Figure 8 and Figure 9 , the restriction portion 64 is formed so as to extend from one of the top plate portions 61A forming the notch portion 63 on the radially inner side of the notch portion 63. In other words, the restriction portion 64 is formed as a cantilever beam with a free end at the front end portion in the notch portion 63. The gap between the front end portion of the restriction portion 64 and the other top plate portion 61A is preferably smaller than the length of the restriction portion 64.

[0059] The negative electrode lead 50 can be engaged with the shoulder portion 25C of the outer can 25 with the front end portion 50A (see Figure 6 ) of the negative electrode lead 50 abutting against the outer side surface 64A of the restriction portion 64 or slightly spaced apart in the radial direction of the electricity storage device 20.

[0060] By the restriction portion 64, as with the restriction portion 34 described above, 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 can be ensured, and the engagement area of the negative electrode lead 50 and the shoulder portion 25C (negative electrode) of the outer can 25 of the electricity storage device 20 can be ensured.

[0061] The limiting part 64 has an inclined part 64B formed from the upper surface toward the outer side 64A. Thus, by using a connector or clamp or the like when engaging the negative lead 50 with the shoulder 25C of the outer can 25, the negative lead 50 can be easily inserted into the notch 33.

[0062] Furthermore, the limiting part 64 has a bottom surface 64C that slopes downward toward the front end. The limiting part 64 is formed such that the vertical position of the bottom surface 64C on the front end side of the limiting part 64 is lower than the vertical position of the top plate part 61A. As a result, the limiting part 64 actively abuts against the top surface of the energy storage device 20. Therefore, the limiting part 64 can prevent the negative lead 50 from penetrating between the limiting part 64 and the energy storage device 20.

[0063] For example, if the relative positions of the energy storage device 20 and the upper bracket 60 deviate due to dimensional or assembly tolerances of the shape of the energy storage device 20 or the upper bracket 60, resulting in a gap between the top plate portion 61A of the energy storage device 20 and the upper bracket 60, the bottom surface 64C of the front end side of the limiting portion 64 is positioned lower in the vertical direction than the top plate portion 61A. Therefore, the bottom surface 64C of the limiting portion 64 abuts against the energy storage device 20, preventing the negative lead 50 from penetrating downwards into the limiting portion 64.

[0064] On the other hand, when there is no gap between the energy storage device 20 and the top plate portion 61A of the upper support 60, since the limiting portion 64 is formed extending from the top plate portion 61A, the front end side of the limiting portion 64 is slightly bent upwards, and the bottom surface 64C of the limiting portion 64 abuts against the energy storage device 20, preventing the negative lead 50 from penetrating downwards into the limiting portion 64. Furthermore, in the limiting portion 64, the bottom surface 64C on the front end side protrudes downwards. However, it is also possible for the bottom surface 64C on the base side of the limiting portion 64 to protrude downwards. Moreover, as long as the limiting portion 64 does not deviate towards the front end side or the base side when bent, the bottom surface 64C of the limiting portion 64 can also protrude entirely. Furthermore, as long as the limiting portion 64 is bent, it may not be cantilevered like the limiting portion 64, but rather a shape supporting both ends.

[0065] use Figure 10 as well as Figure 11 The negative lead 70 of the energy storage module 10, which is another example of an implementation method, will be described. Figure 10 This is a plan view showing the negative lead 70. Figure 11 yes Figure 10 A three-dimensional image.

[0066] As described above, the negative lead wire 70 is a portion that is connected to the shoulder portion 25C (negative electrode terminal) of the outer case 25 of the electricity storage device 20 as viewed from the notch portion 33 of the upper holder 30. The negative lead wire 70 can be applied to either of the electricity storage module 10 having the upper holder 30 or the electricity storage module 10 having the upper holder 60, but the following describes an example of application to the electricity storage module 10 having the upper holder 30.

[0067] In Figure 10 and Figure 11 the negative lead wire 70 has an engaging portion 71 that engages with the shoulder portion 25C (negative electrode terminal) of the outer case 25 of the electricity storage device 20, and a connecting portion 72 that connects the engaging portion 71 with the main body (not shown) of the second current collector. The engaging portion 71 includes a wall portion 71A that is formed by standing both end portions in the circumferential direction (a direction that intersects with the radial direction in a broad sense) of the electricity storage device 20. The wall portion 71A is formed by, for example, bending processing. The wall portion 71A can also engage a separate member with both end portions in the circumferential direction of the connecting portion 72. Further, the size in the up-down direction of the wall portion 71A can also be lower than the height that protrudes from the notch portion 33 in the top surface of the upper holder 60. In addition, even if the size in the up-down direction of the wall portion 71A is smaller than the gap between the electricity storage device 20 and the restricting portion 64, it is possible to reduce the possibility of entry into the above-described gap by the engaging portion without the wall portion 71A. Further, if the size in the up-down direction of the wall portion 71A is greater than the above-described gap, it is possible to more significantly reduce the possibility of entry into the above-described gap.

[0068] For example, even in a case where a gap is generated between the electricity storage device 20 and the top plate portion 31A of the upper holder 30 due to a relative positional deviation caused by a dimensional tolerance of the shape of the electricity storage device 20 or the upper holder 30, or an assembly tolerance of the electricity storage device 20 and the upper holder 30, since the size (height) in the up-down direction of the negative lead wire 70 is increased by the wall portion 71A, it is possible to hinder the negative lead wire 70 from being driven into the above-described gap.

[0069] On the other hand, it is also conceivable to perform bending processing on the front end portion (inner end side in the radial direction) of the engaging portion 71 to form a wall portion at the front end portion of the engaging portion 71, but in a case where the positive current collecting foil including the positive lead wire and the negative current collecting foil including the negative lead wire 70 are manufactured from one piece of metal foil by press processing, the front end portion of the engaging portion 71 of the negative lead wire 70 and the front end portion of the positive lead wire are often close in the metal foil before pressing. In such a case, it is sometimes difficult to form a wall portion at the front end portion of the engaging portion 71.

[0070] Therefore, by performing bending processing on at least one end in the circumferential direction (a direction that intersects with the radial direction in a broad sense) of the engaging portion 71 to form the wall portion 71A, it is possible to prevent the negative lead wire 70 from being driven below the restricting portion 34.

[0071] In addition, the present application is not limited to the above-described embodiments and modified examples thereof, and various changes and improvements can be made within the scope of the matters described in the patent request of the present application, which is natural.

[0072] Explanation of symbols

[0073] 10: electricity storage module, 20: electricity 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 bracket, 31: housing portion, 31A: top plate portion, 31B: wall portion, 32: opening portion, 33: notch 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 bracket, 50: negative electrode lead wire, 50A: front end portion, 60: upper bracket, 61A: top plate portion, 63: notch 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 energy storage module, comprising: At least one cylindrical energy storage device; and Maintain the support on one side of the energy storage device. A first terminal and a second terminal are provided at one end of the energy storage device. The second terminal is positioned radially outward from the first terminal in the energy storage device. The energy storage module also includes a lead wire that connects to the second terminal from the radially outer side. The bracket has a limiting portion located radially inside at least a portion of the lead wire. The bottom surface of the limiting part protrudes further downward in the bracket than the surface opposite one end of the energy storage device.

2. The energy storage module according to claim 1, wherein, The bracket has an opening that exposes the first terminal and a notch formed around the opening that exposes the second terminal. The limiting portion extends from one side of the bracket that forms the notch.

3. The energy storage module according to claim 1, wherein, One end of the energy storage device abuts against the bottom surface of the limiting part.

4. An energy storage module, comprising: At least one cylindrical energy storage device; and Maintain the support on one side of the energy storage device. A first terminal and a second terminal are provided at one end of the energy storage device. The second terminal is positioned radially outward compared to the first terminal. The energy storage module also includes a lead wire that connects to the second terminal from the radially outer side. The bracket has a limiting portion that restricts the lead wire to be located further outward than a given position in the radial direction. The lead wire has a joint portion that engages with the second terminal. The joint includes a wall portion formed therein. The wall portion extends in the direction in which the joint and the energy storage device are arranged.

5. The energy storage module according to claim 4, wherein, The wall portion is formed at both ends of the joint in a direction intersecting the radial direction of the energy storage device.

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