Energy storage module

Abstract

This electric power storage module is provided with at least one cylindrical electric power storage device having a positive terminal and a negative terminal disposed on an upper end portion of the electric power storage device. The negative terminal is disposed outwardly of the positive terminal in the radial direction of the electric power storage device, and is further provided with a negative lead electrically connected to the negative terminal from the outside in the radial direction. The negative lead includes an abutting portion abutting a side surface of the electric power storage device, and a shoulder portion formed inwardly of the abutting portion in the radial direction and including a junction portion with the negative terminal.

Description

[Technical Field]

[0001] The present disclosure relates to an energy storage module. [Background technology]

[0002] Conventionally, a power storage module is known as a power source including a plurality of power storage devices. For example, the power storage module disclosed in Patent Document 1 includes a plurality of cylindrical batteries. In this cylindrical battery, the sealing body serves as a positive terminal and the outer can serves as a negative terminal, with a negative lead joined to the shoulder (the crimped open end) of the outer can. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] U.S. Patent No. 10,707,471 Summary of the Invention [Problem to be solved by the invention]

[0004] However, an insulating distance must be ensured between the negative electrode lead and the positive electrode terminal, and when joining the negative electrode lead to the outer can, the position of the negative electrode lead must be aligned with high precision to an appropriate joining position on the outer can.

[0005] An object of the present disclosure is to provide an electricity storage module in which the position of a lead can be aligned with high precision to an appropriate joining position on an outer can, like the above-mentioned negative electrode lead. [Means for solving the problem]

[0006] An energy storage module according to one embodiment of the present disclosure includes at least one cylindrical energy storage device, and a first terminal and a second terminal are arranged at one end of the energy storage device. The second terminal is arranged radially outward of the first terminal with respect to the energy storage device, and further includes a lead electrically connected to the second terminal from the radially outer side, and the lead has an abutment portion that abuts against a side surface of the energy storage device, and a shoulder portion that is formed radially inward of the abutment portion and includes a joint portion with the second terminal. [Effects of the Invention]

[0007] According to one aspect of the present disclosure, the lead can be positioned accurately at an appropriate joining position on the second terminal, thereby reducing the attachment tolerance between the second terminal and the lead. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a side cross-sectional view showing an electricity storage module according to an embodiment. [Figure 2] FIG. 2 is a perspective view showing a current collecting member according to the embodiment. [Figure 3] 3 is a cross-sectional view showing the electricity storage device and upper holder according to the embodiment, and the negative electrode lead according to the first embodiment. FIG. [Figure 4] FIG. 2 is a plan view showing a negative electrode lead according to the first embodiment. [Figure 5] FIG. 2 is a perspective view showing a negative electrode lead according to the first embodiment. [Figure 6] 10 is a cross-sectional view showing an electricity storage device and an upper holder according to an embodiment, and a negative electrode lead according to a second embodiment. FIG. [Figure 7] FIG. 10 is a plan view showing a negative electrode lead according to a second embodiment. [Figure 8] FIG. 10 is a perspective view showing a negative electrode lead according to a second embodiment. [Figure 9] FIG. 10 is a cross-sectional view showing an electricity storage device and an upper holder according to an embodiment, and a negative electrode lead according to a third embodiment. [Figure 10] FIG. 10 is a plan view showing a negative electrode lead according to a third embodiment. [Figure 11] FIG. 10 is a perspective view showing a negative electrode lead according to a third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. The shapes, materials, and quantities described below are merely examples and can be changed as appropriate depending on the specifications of the energy storage module.

[0010] An energy storage module 10 according to an embodiment will be described with reference to Fig. 1. Fig. 1 is a side cross-sectional view showing the energy storage module 10. In the following description, the energy storage module 10 and the energy storage device 20 will be described with the side where an upper holder 40 serving as a holder holds the energy storage device 20 being the upper side in the up-down direction. However, the upper holder 40 may also be on the lower side of the energy storage module 10.

[0011] The power storage module 10 is primarily used as a power source for motive power. The power storage module 10 is used as a power source for motor-driven electric devices such as electric vehicles, power tools, power-assisted bicycles, electric motorcycles, electric wheelchairs, electric tricycles, and electric carts. However, the uses of the power storage module 10 are not limited, and the module may also be used as a power source for various electric devices used indoors and outdoors, such as vacuum cleaners, radios, lighting devices, digital cameras, and video cameras.

[0012] 1, the energy storage module 10 includes a plurality of cylindrical energy storage devices 20, current collecting members 30 that collect current from first terminals (positive electrode terminals) and second terminals (negative electrode terminals) of the energy storage devices 20, upper holders 40 that serve as holders that hold the upper end sides of the plurality of energy storage devices 20, and lower holders 50 that hold the lower end sides of the plurality of energy storage devices 20. The current collecting members 30 and the upper holders 40 will be described in detail below.

[0013] The current collecting member 30 according to this embodiment will be described with reference to Fig. 2. Fig. 2 is a plan view showing the current collecting member 30.

[0014] The current collecting member 30 is formed from a plate-shaped metal material (metal foil) and is provided on the top surface of the upper holder 40. The current collecting member 30 is formed with a positive electrode lead 31 connected to a positive electrode terminal of the electricity storage device 20, a connecting portion 32 connecting the positive electrode leads 31 to each other, and a negative electrode lead 60 as a lead connected to a negative electrode terminal of the electricity storage device 20. The negative electrode lead 60 includes a fuse portion 65 connecting the negative electrode lead 60 to the connecting portion 32. The negative electrode lead 60 will be described in detail later.

[0015] The positive electrode lead 31 extends above an opening 42 of the upper holder 40, which will be described later, and is joined to the top surface of a sealing body 26, which serves as a positive electrode terminal, which will be described later. The connecting portion 32 is formed in a strip or sheet shape. The negative electrode lead 60 extends above a cutout portion 43 of the upper holder 40, which will be described later, and is joined to a shoulder portion 25C of the outer can 25, which serves as a negative electrode terminal, which will be described later. The fuse portion 65 is formed in a strip shape that is narrower than the connecting portion 32, and is provided so as not to overlap the opening 42 and cutout portion 43 of the upper holder 40. Note that the fuse portion 65 does not necessarily have to be provided in the electricity storage device of the present disclosure.

[0016] The current collecting member 30 can minimize current collection loss because it uses a single metal foil to connect the positive and negative terminals of the electricity storage devices 20 and to collect current from a plurality of electricity storage devices 20. Furthermore, because the current collecting member 30 is formed from a single metal foil, it can be processed accurately and at low cost by etching or the like.

[0017] The electricity storage device 20 according to the embodiment will be described with reference to Fig. 3. Fig. 3 is a detailed view of part A in Fig. 1. Below, each member will be described according to the radial and circumferential directions of the cylindrical shape of the electricity storage device 20.

[0018] A cylindrical lithium ion secondary battery is used as the power storage device 20. The power storage device 20 is not limited to a lithium ion secondary battery, and may be a nickel-metal hydride battery, a capacitor, or the like.

[0019] As will be described in detail later, the energy storage device 20 has a positive electrode terminal as a first terminal and a negative electrode terminal as a second terminal arranged at its upper end. The negative electrode terminal is arranged so as to surround the periphery of the positive electrode terminal, so that the negative electrode terminal is arranged radially outward of the positive electrode terminal. More specifically, the positive electrode terminal is arranged on the top surface of the sealing body 26, which will be described later. The negative electrode terminal is also arranged on the crimped open end (hereinafter, shoulder 25C) of the outer can 25, which will be described later.

[0020] The energy storage device 20 includes an electrode group 24, for example, in which a strip-shaped positive electrode 21 and a strip-shaped negative electrode 22 are wound with a strip-shaped separator 23 interposed therebetween; a cylindrical outer can 25 that accommodates the electrode group 24 together with an electrolyte; a sealing body 26 that seals the opening of the outer can 25 in an insulated state; a foil-shaped positive electrode tab 27 that electrically connects the positive electrode 21 to the sealing body 26; and a negative electrode tab (not shown) that electrically connects the negative electrode 22 to the outer can 25. An insulating gasket 28 is disposed between the outer periphery of the sealing body 26 and the inner circumferential surface of the opening of the outer can 25. Note that the energy storage device 20 may have the positive electrode tab 27 connected to the outer can 25 and the negative electrode tab connected to the sealing body 26. In this case, the second terminal serves as a positive electrode terminal. The lead that served as the negative electrode lead 60 is used as a positive electrode lead.

[0021] An annular groove 25A is formed on the outer peripheral surface of the outer can 25 on the opening side. This groove 25A has a corresponding annular protrusion 25B formed on the inner peripheral surface of the outer can 25. The gasket 28 and sealing body 26 are placed on this annular protrusion 25B inside the outer can 25. Furthermore, a shoulder 25C of the outer can 25 is crimped so as to be tilted toward the inside of the outer can 25 with the gasket 28 placed on the inner peripheral side. The crimped shoulder 25C and protrusion 25B sandwich the sealing body 26 in the vertical direction via the gasket 28, thereby sealing the opening of the outer can 25.

[0022] It should be noted that shoulder portion 25C is not limited to the above-described configuration. For example, a terminal plate may be provided in the center of sealing body 26, and a conductive joint portion may be provided around the outermost periphery of sealing body 26 while being insulated from the terminal plate, and the opening edge of outer can 25 may be welded to the joint portion to seal the opening. In this case, negative electrode lead 60 may be connected to the top surface of the joint portion.

[0023] The sealing body 26 may be provided with a current interrupter (CID) or an exhaust valve that ruptures when the pressure inside the outer can 25 reaches or exceeds a predetermined level. Furthermore, an insulating plate 29 for insulating the electrode group 24 from the outer can 25 may be provided between the electrode group 24 and the protruding portion 25B. If the insulating plate 29 is provided, the positive electrode tab 27 may extend through a through-hole formed in the insulating plate 29. Furthermore, an insulating plate for insulating the electrode group 24 from the outer can 25 may be provided between the electrode group 24 and the bottom of the outer can 25. The negative electrode tab may extend through a through-hole formed in the insulating plate or may extend around the insulating plate.

[0024] In the energy storage device 20, as described above, the positive electrode terminal is configured on the top surface of the sealing body 26, and the positive electrode lead 31 (see FIG. 2) connected to the positive electrode current collector foil is joined thereto. Also, in the energy storage device 20, as described above, the negative electrode terminal is configured on the crimped shoulder portion 25C of the outer can 25, and the negative electrode tab connected to the negative electrode current collector foil is joined to the bottom of the outer can 25. The negative electrode lead 60 is joined to the shoulder portion 25C of the outer can 25 from the radially outer side of the energy storage device 20.

[0025] The upper holder 40 according to the embodiment will be described with reference to FIG.

[0026] The upper holder 40 is a member that holds the upper end sides of the multiple power storage devices 20. The upper holder 40 is made of a thermoplastic resin. Thermoplastic resins are broadly classified into general-purpose plastics and engineering plastics, and polyethylene, polypropylene, polyamide, ABS, etc. are used.

[0027] 3, a plurality of accommodation portions 41 are formed on the bottom surface of the upper holder 40, and each accommodation portion 41 accommodates an upper end side of each power storage device 20. The upper end sides of the power storage devices 20 are fitted into the accommodation portions 41, whereby the upper end sides of the power storage devices 20 are held by the upper holder 40.

[0028] The accommodation portion 41 is formed in the bottom surface of the upper holder 40 as a recess including a ceiling portion 41A having a bottom surface facing the upper end surface of the electricity storage device 20, and a wall portion 41B having an inner peripheral surface facing the side peripheral surface of the electricity storage device 20. Around the periphery of the accommodation portion 41, an opening portion 42 is formed which exposes the top surface of the sealing body 26 of the electricity storage device 20 to the upper surface of the upper holder 40, and a notch portion 43 is formed which exposes a shoulder portion 25C of the outer can 25 of the electricity storage device 20 from the upper surface of the upper holder 40.

[0029] The opening 42 is a circular opening in the ceiling portion 41A of the storage portion 41. The diameter of the opening 42 is smaller than the inner diameter of the wall portion 41B. The opening 42 exposes the top surface of the sealing body 26 of the electricity storage device 20 from the upper surface of the upper holder 40. Therefore, the top surface of the sealing body 26 and the positive electrode lead 31 can be joined through the opening 42. The bottom of the ceiling portion 41A may be in contact with the electricity storage device 20.

[0030] Cutout portion 43 is a portion formed by cutting out a part of the edge of opening 42. Cutout portion 43 allows a part of shoulder portion 25C of outer can 25 of power storage device 20 to be exposed from the upper surface of upper holder 40. The inner peripheral surface of cutout portion 43 (a surface parallel to wall portion 41B of housing portion 41) is defined as wall portion 43B.

[0031] The negative electrode lead 60 according to the first embodiment will be described with reference to Fig. 3 to Fig. 5. Fig. 4 is a plan view of part A in Fig. 1. Fig. 5 is a perspective view of the negative electrode lead 60.

[0032] 3, the negative electrode lead 60 is connected to the shoulder 25C (negative electrode terminal) of the outer can 25 of the electricity storage device 20 visible through the cutout 43 of the upper holder 40, as described above. The negative electrode lead 60 can be applied to either the electricity storage module 10 having the upper holder 40 or the electricity storage module 10 having the lower holder 50, but below, an example in which the negative electrode lead 60 is applied to the electricity storage module 10 having the upper holder 40 will be described.

[0033] 5 and 6, the negative electrode lead 60 has a contact portion 61 that contacts the side surface of the energy storage device 20, a lead shoulder portion 62 that is formed radially inward from the contact portion 61 and serves as a shoulder portion including a portion that is joined to the shoulder portion 25C of the outer can 25, and a biasing portion 63 that is formed radially outward from the contact portion 61 and biases the contact portion 61 and the lead shoulder portion 62 radially inward.

[0034] As described above, the contact portion 61 comes into contact with the side surface of the electricity storage device 20. More specifically, the contact portion 61 comes into contact with the side surface of the upper end portion of the outer can 25. If the upper end portion of the outer can 25 is formed in an R-shape, the contact portion 61 may be formed so as to come into contact with the R-shape.

[0035] The lead shoulder 62 is formed continuously radially inward from the contact portion 61, and includes a portion that contacts the shoulder 25C of the outer can 25 as described above and is joined to the shoulder 25C of the outer can 25. It is preferable that the radial inner end position of the lead shoulder 62 is the same as the radial inner end position of the shoulder 25C of the outer can 25 when the contact portion 61 contacts the side surface of the upper end of the outer can 25.

[0036] In this example, one circumferential side of the lead shoulder 62 is connected to a rising portion 64 formed at an angle toward the top surface of the upper holder 40. The rising portion 64 is connected to a fuse portion 65 on the top surface of the upper holder 40.

[0037] The biasing portion 63 extends from the abutting portion 61 and is formed continuously radially outward from the abutting portion 61 as described above, and biases the abutting portion 61 and the lead shoulder portion 62 radially inward. The biasing portion 63 is formed by a holder abutting portion 63A that abuts against the wall portion 41B (the surface that intersects with the end portion of the electricity storage device 20) of the accommodation portion 41 of the upper holder 40, and a connecting portion 63B that is inclined from the holder abutting portion 63A and connected to the abutting portion 61. As a result, the biasing portion 63 is formed as a leaf spring consisting of the holder abutting portion 63A and the connecting portion 63B, and biases the abutting portion 61 against the wall portion 41B of the accommodation portion 41 of the upper holder 40.

[0038] The biasing portion 63 biases the contact portion 61 and the lead shoulder portion 62 radially inward relative to the upper holder 40, thereby allowing the contact portion 61 to contact the side surface of the upper end portion of the outer can 25. This determines the position of the lead shoulder portion 62 on the shoulder portion 25C of the outer can 25. In other words, the biasing portion 63 absorbs variations in the gap between the upper holder 40 and the electricity storage device 20 and the attachment tolerance between the outer can 25 and the negative electrode lead 60.

[0039] The negative electrode lead 60 can be positioned with high precision at an appropriate joining position of the shoulder portion 25C of the outer can 25. This reduces the attachment tolerance between the outer can 25 and the negative electrode lead 60, thereby increasing the joining area between the outer can 25 and the negative electrode lead 60. Furthermore, by increasing the joining area between the outer can 25 and the negative electrode lead 60, the precision of aligning a joining tool can be relaxed, improving the efficiency of the joining work. Furthermore, because the biasing portion 63 extends downward from the lead shoulder 62, even if a joining tool larger than the lead shoulder 62 is used, it is possible to prevent interference with the joining work. Furthermore, because the biasing portion 63 abuts against the wall portion 41B, when the biasing portion 63 biases the negative electrode lead 60 against the side surface of the electricity storage device 20, deformation of the negative electrode lead 60 on the connecting portion 32 side from the lead shoulder 62 is easily suppressed.

[0040] The negative electrode lead 70 according to the second embodiment will be described with reference to Fig. 6 to Fig. 8. Fig. 6 is a detailed view of part A in Fig. 1. Fig. 7 is a plan view of part A in Fig. 1. Fig. 8 is a perspective view of the negative electrode lead 70.

[0041] 6, the negative electrode lead 70 is connected to the shoulder portion 25C (negative electrode terminal) of the outer can 25 of the electricity storage device 20 visible through the cutout portion 43 of the upper holder 40, as described above. Details of the upper holder 40 and the electricity storage device 20 have been described above, so a detailed description thereof will be omitted.

[0042] 7 and 8, the negative electrode lead 70 has a contact portion 71 that contacts the side surface of the energy storage device 20, a lead shoulder portion 72 that is formed radially inward from the contact portion 71 and serves as a shoulder portion including a portion that is joined to the shoulder portion 25C of the outer can 25, and a biasing portion 73 that is formed radially outward from the contact portion 71 and biases the contact portion 71 and the lead shoulder portion 72 radially inward.

[0043] As described above, the contact portion 71 comes into contact with the side surface of the electricity storage device 20. More specifically, the contact portion 71 comes into contact with the side surface of the upper end portion of the outer can 25. If the upper end portion of the outer can 25 is formed in an R-shape, the contact portion 71 may be formed so as to come into contact with the R-shape.

[0044] The lead shoulder 72 is formed continuously radially inward from the contact portion 71, and includes a portion that contacts the shoulder 25C of the outer can 25 as described above and is joined to the shoulder 25C of the outer can 25. It is preferable that the radial inner end position of the lead shoulder 72 is the same as the radial inner end position of the shoulder 25C of the outer can 25 when the contact portion 71 contacts the side surface of the upper end of the outer can 25.

[0045] As described above, the biasing portion 73 is formed continuously radially outward from the abutting portion 71 and biases the abutting portion 71 and the lead shoulder portion 72 radially inward. The biasing portion 73 is formed from a holder abutting portion 73A that abuts against the wall portion 43B of the cutout portion 43 of the upper holder 40, and a connecting portion 73B that is bent from the holder abutting portion 73A and connected to the abutting portion 71. As a result, the biasing portion 73 is formed as a substantially V-shaped (or U-shaped) leaf spring made up of the holder abutting portion 73A and the connecting portion 73B, and biases the abutting portion 71 against the wall portion 43B of the accommodation portion 41 of the upper holder 40.

[0046] In this example, the upper end of the holder abutment portion 73A extends to the top surface of the upper holder 40, and is connected to the negative electrode lead connection portion 75 on the top surface of the upper holder 40.

[0047] The biasing portion 73 biases the contact portion 71 and the lead shoulder portion 72 radially inward relative to the upper holder 40, thereby allowing the contact portion 71 to contact the side surface of the upper end portion of the outer can 25. This determines the position of the lead shoulder portion 72 on the shoulder portion 25C of the outer can 25. In other words, the biasing portion 63 absorbs variations in the gap between the upper holder 40 and the electricity storage device 20 and the attachment tolerance between the outer can 25 and the negative electrode lead 60.

[0048] The negative electrode lead 70 can be positioned with high precision at an appropriate joining position of the shoulder portion 25C of the outer can 25. This reduces the attachment tolerance between the outer can 25 and the negative electrode lead 70, thereby increasing the joining area between the outer can 25 and the negative electrode lead 70. Furthermore, by increasing the joining area between the outer can 25 and the negative electrode lead 70, the precision of alignment of the joining tool can be relaxed, improving the efficiency of the joining work. Furthermore, like the pressing portion 63, the pressing portion 73 also extends downward from the lead shoulder portion 72 when extending radially outward from the abutting portion 71, making it easier to use a larger joining tool. Furthermore, because the pressing portion 73 abuts against the wall portion 43B, when the pressing portion 73 presses the negative electrode lead 70 against the side surface of the energy storage device 20, deformation of the negative electrode lead 70 on the connecting portion 32 side from the pressing portion 73 is easily suppressed. Furthermore, the biasing portion 73 is configured to taper from the top surface toward the bottom surface of the upper holder 40. Therefore, it can be easily inserted into the space inside the upper holder 40, such as the notch 43.

[0049] The negative electrode lead 80 according to the third embodiment will be described with reference to Fig. 9 to Fig. 11. Fig. 9 is a detailed view of part A in Fig. 1. Fig. 10 is a plan view of part A in Fig. 1. Fig. 11 is a perspective view of the negative electrode lead 80.

[0050] 9, the negative electrode lead 80 is connected to the shoulder portion 25C (negative electrode terminal) of the outer can 25 of the electricity storage device 20 visible through the cutout portion 43 of the upper holder 40, as described above. Details of the upper holder 40 and the electricity storage device 20 have been described above, so a detailed description thereof will be omitted.

[0051] 10 and 11, the negative electrode lead 80 has a contact portion 81 that contacts the side surface of the energy storage device 20, a lead shoulder portion 82 that is formed radially inward from the contact portion 81 and serves as a shoulder portion including a portion that is joined to the shoulder portion 25C of the outer can 25, and a biasing portion 83 that is formed midway through a fuse portion 85 described later and biases the contact portion 81 and the lead shoulder portion 82 radially inward.

[0052] As described above, the abutting portion 81 abuts against the side surface of the electricity storage device 20. More specifically, the abutting portion 81 abuts against the side surface of the upper end portion of the outer can 25. If the upper end portion of the outer can 25 is formed in an R-shape, the abutting portion 81 may be formed so as to abut along the R-shape. The abutting portion 81 is formed to extend from the lead shoulder portion 82.

[0053] As described above, the lead shoulder 82 is formed continuously radially inward from the contact portion 81, and includes a portion that contacts the shoulder 25C of the outer can 25 and is joined to the shoulder 25C of the outer can 25. It is preferable that the radial inner end position of the lead shoulder 82 is the same as the radial inner end position of the shoulder 25C of the outer can 25 when the contact portion 81 contacts the side surface of the upper end of the outer can 25.

[0054] A contact portion 81 is connected to the radially outer side of the lead shoulder portion 82 at the center in the width direction (circumferential direction of the electricity storage device 20), and rising portions 84 are connected to both ends in the width direction. The rising portions 84 extend to the top surface of the upper holder 40 and are connected to a fuse portion 85 that is connected to the connecting portion 32 of the current collecting member 30 on the top surface of the upper holder 40.

[0055] As described above, the biasing portion 83 is formed midway along the fuse portion 85, and biases the contact portion 81 and the lead shoulder portion 82 radially inward. In this example, the biasing portion 83 is formed in an inverted U shape and acts as a leaf spring.

[0056] The biasing portion 83 biases the abutting portion 81 and the lead shoulder portion 82 radially inward, thereby allowing the abutting portion 81 to abut against the side surface of the upper end portion of the outer can 25. This determines the position of the lead shoulder portion 82 on the shoulder portion 25C of the outer can 25. In other words, the biasing portion 63 absorbs variations in the gap between the upper holder 40 and the electricity storage device 20 and the attachment tolerance between the outer can 25 and the negative electrode lead 60.

[0057] The negative electrode lead 80 allows the negative electrode lead 80 to be positioned at an appropriate joining position of the shoulder portion 25C of the outer can 25 with high accuracy. This reduces the attachment tolerance between the outer can 25 and the negative electrode lead 80, thereby increasing the joining area between the outer can 25 and the negative electrode lead 80. Furthermore, by increasing the joining area between the outer can 25 and the negative electrode lead 80, the precision of alignment of the joining tool can be relaxed, improving the efficiency of the joining work. In addition, in the negative electrode lead 80 of this embodiment, the biasing portion 83 is not inserted into a space within the upper holder 40, such as the cutout portion 43, but is disposed outside the accommodation portion 41 and the cutout portion 43. Therefore, when the lead shoulder 82 is moved toward the shoulder 25C to abut against the shoulder 25C, the biasing portion 83 is less likely to rub against or get caught on the surface of the cutout portion 43, hindering the operation of abutting the lead shoulder 82 against the shoulder 25C.

[0058] It should be noted that the present invention is not limited to the above-described embodiment and its modifications, and various changes and modifications are possible within the scope of the claims of this application. [Explanation of symbols]

[0059] 10 Energy storage module, 20 Energy storage device, 21 Positive electrode, 22 Negative electrode, 23 Separator, 24 Electrode group, 25 Outer can, 25A Groove portion, 25B Convex portion, 25C Shoulder portion, 26 Sealing body, 27 Positive electrode tab, 28 Gasket, 29 Insulating plate, 30 Current collecting member, 31 Positive electrode lead, 32 Connection portion, 40 Upper holder, 41 Housing portion, 41A Ceiling portion, 41B Wall portion, 42 Opening, 43 Notch portion, 43B Wall portion, 50 Lower holder, 60 Negative electrode lead, 61 Contact portion, 62 Lead shoulder portion (shoulder portion), 63 Pressing portion, 63A Holder contact portion, 63B Connection portion, 64 Rising portion, 65 Fuse portion, 70 Negative electrode lead, 71 Contact portion, 72 Lead shoulder (shoulder), 73 biasing portion, 73A holder contact portion, 73B connection portion, 75 fuse portion, 80 negative lead, 81 contact portion, 82 lead shoulder (shoulder), 83 biasing portion, 84 rising portion, 85 fuse portion

Claims

1. At least one cylindrical storage device is provided; a first terminal and a second terminal are arranged at one end of the power storage device; the second terminal is disposed outward of the first terminal in a radial direction of the power storage device, a lead electrically connected to the second terminal from the outside in the radial direction; The lead a contact portion that contacts a side surface of the electricity storage device; a shoulder portion formed radially inward of the abutting portion and including a joint portion with the second terminal; a biasing portion formed radially outward of the contact portion; and the biasing portion biases the abutment portion and the shoulder portion toward the inside in the radial direction of the power storage device. Energy storage module.

2. The energy storage module according to claim 1, a holder for holding one side of the power storage device; The biasing portion is supported by the holder. Energy storage module.

3. The energy storage module according to claim 2, the holder has a housing portion that houses one side of the power storage device, the biasing portion is supported by the holder by abutting against a wall portion of the accommodation portion; Energy storage module.

4. The energy storage module according to claim 3, the biasing portion extends radially outward from the abutting portion and abuts against a surface of the holder that intersects with the shoulder portion of the power storage device; Energy storage module.

5. The energy storage module according to claim 2, the holder has an opening for exposing the first terminal and a notch formed around the opening for exposing the second terminal; the biasing portion is supported by the holder by abutting against a wall portion of the notch portion; Energy storage module.

6. The energy storage module according to claim 1, a holder for holding one side of the power storage device; The biasing portion is provided on one radially extending surface of the holder. Energy storage module.

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