power storage module

Abstract

An energy storage module (10) comprises: an energy storage device (20), which is cylindrical and has an inner terminal and an outer terminal; an upper retainer (40) that holds the upper end of the energy storage device (20) on a first axis; and a negative lead (62). A positive terminal and a negative terminal are disposed on the energy storage device (20), the negative terminal being disposed radially outside the positive terminal, and the negative lead (62) is connected to the negative terminal. The upper retainer (40) has a receiving portion (41) for receiving the upper end of the energy storage device (20), and the receiving portion (41) has: a second opening (44) that exposes a portion of the negative terminal connected to the negative lead (62); and a gap (45) located at a different position from the second opening (44) in a radial direction orthogonal to the axial direction, forming a predetermined gap with the negative terminal.

Description

Technical Field

[0001] This disclosure relates to energy storage modules. Background Technology

[0002] The energy storage module is used as a power source having multiple energy storage devices. In addition, in the energy storage module, sometimes a positive and a negative electrode are arranged on one side of the energy storage device, and a positive lead and a negative lead are arranged on one side of the energy storage module (for example, Patent Document 1).

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2021-136238 Summary of the Invention

[0006] In energy storage modules, due to long-term use, it is necessary to maintain reliability over a long period of time.

[0007] The energy storage module disclosed herein comprises: an energy storage device, which is cylindrical and has an inner terminal and an outer terminal; a retainer that holds one end of the energy storage device on a first axis; and an outer lead. The inner terminal and the outer terminal are disposed at the one end of the energy storage device, the outer terminal being radially positioned further outward than the inner terminal, the outer lead being connected to the outer terminal, and a receiving portion formed in the retainer for receiving one end of the energy storage device. The receiving portion includes: an outer opening that exposes a portion of the outer terminal connected to the outer lead; and a gap located at a different position from the outer opening on a second axis orthogonal to the first axis, forming a predetermined gap with the outer terminal.

[0008] The energy storage module disclosed herein can improve reliability. Attached Figure Description

[0009] Figure 1 This is a perspective view showing an energy storage module as an example of an implementation method.

[0010] Figure 2 This is an axial cross-sectional view of an energy storage device as an example of an implementation.

[0011] Figure 3 This is a top view showing the upper retainer as an example of an implementation.

[0012] Figure 4 This is a perspective view of the upper retainer as an example of an implementation method, viewed from the bottom side.

[0013] Figure 5This is a perspective view of the upper retainer as another example of the embodiment, viewed from the bottom side.

[0014] Figure 6 This is a perspective view of the upper retainer as another example of the implementation method, viewed from the bottom side.

[0015] Figure 7 This is a schematic diagram illustrating the process of replacing an energy storage device.

[0016] Figure 8 This is a schematic diagram illustrating the process of replacing the energy storage device in the comparative example. Detailed Implementation

[0017] Hereinafter, an example of an embodiment of the present disclosure will be described in detail. In the following description, the specific shape, material, orientation, values, etc. are examples for ease of understanding of the present disclosure and can be appropriately changed according to the use, purpose, specifications, etc.

[0018] [Energy Storage Module]

[0019] use Figure 1 The energy storage module 10, as an example of an implementation method, will be described.

[0020] The energy storage module 10 is mounted in an electric vehicle as a power source for driving the motor. However, the energy storage module of this disclosure is not limited to electric vehicles; for example, it can also be used as a power source for motor-driven electric devices such as power tools, electric-assisted bicycles, electric motorcycles, electric wheelchairs, electric tricycles, and electric trolleys. Furthermore, the application of the energy storage module of this disclosure is not limited; for example, it can also be used as a power source for various electrical devices used indoors and outdoors, such as cleaners, wireless devices, lighting fixtures, digital cameras, and camcorders.

[0021] Hereinafter, the components of the energy storage module 10 will sometimes be described using the axial (first axis), radial, or circumferential directions to refer to the cylindrical energy storage device 20 described later.

[0022] The energy storage module 10 includes: a plurality of energy storage devices 20; an upper retaining member 40 serving as a retaining member, which holds the upper side of the energy storage devices 20; a lower retaining member 50 serving as a retaining member, which holds the lower side of the energy storage devices 20; and a current collector 60 disposed on the upper surface of the upper retaining member 40, the current collector 60 connecting the positive terminals serving as first terminals to each other and connecting the negative terminals serving as second terminals to each other.

[0023] Multiple energy storage devices 20 can also be packed into the energy storage module 10 in the most densely packed manner, taking safety into consideration, with adjacent energy storage devices 20 arranged approximately close to each other. For example, from a top-down view, the energy storage devices 20 can be arranged in a manner where six energy storage devices 20 surround one energy storage device 20 (or arranged in an alternating pattern). Alternatively, multiple energy storage devices can be arranged with the closest energy storage devices positioned around the perimeter.

[0024] [Electronic Storage Device]

[0025] use Figure 2 The energy storage device 20, which is one example of an implementation method, will be described in detail.

[0026] In this embodiment, a cylindrical lithium-ion secondary battery is used for the energy storage device 20, but it can also be a nickel-metal hydride battery, a capacitor, etc. The energy storage device 20 includes: an electrode assembly 24, which is formed by winding, for example, a strip-shaped positive electrode 21 and a strip-shaped negative electrode 22 with a strip-shaped separator 23 in between; a cylindrical outer can 25 that houses the electrode assembly 24 and the electrolyte; a sealing body 26 that seals an opening at one axial end of the outer can 25 in an insulated manner; a foil-shaped positive electrode tab 27 that electrically connects the positive electrode 21 to the sealing body 26; and a negative electrode tab 28 that electrically connects the negative electrode 22 to the outer can 25. An insulating gasket 29 may also be disposed between the outer periphery of the sealing body 26 and the inner circumferential surface of the opening of the outer can 25.

[0027] An annular groove 25A is formed on the opening side of the outer peripheral surface of the outer can 25. This groove 25A forms an annular protrusion on the inner peripheral surface of the outer can 25. A gasket 29 and a sealing body 26 are disposed inside the outer can 25 on this annular protrusion. Furthermore, with the gasket 29 disposed on the inner peripheral side, the opening end of the outer can 25 is bent in a manner that it tilts towards the inside of the outer can 25. By using the bent opening end and the protrusion to axially clamp the sealing body 26 through the gasket 29, the opening of the outer can 25 is sealed.

[0028] An exhaust valve may also be provided on the sealing body 26, which ruptures upon reaching a specified pressure in the current cut-off mechanism (CID) or the outer can 25. Alternatively, an insulating plate 30 may be provided between the electrode assembly 24 and the bottom of the outer can 25, or between the electrode assembly 24 and the protrusion (groove 25A), to insulate the electrode assembly 24 from the outer can 25. With the insulating plate 30 provided, the positive electrode tab 27 may extend through a through-hole formed in the insulating plate 30. The negative electrode tab 28 may extend through the through-hole formed in the insulating plate 30 or bypass the insulating plate 30.

[0029] In the energy storage device 20, the positive terminal, which serves as the first terminal, is formed on the top surface of the sealing body 26, and the negative terminal, which serves as the second terminal, is formed on the shoulder 25B of the outer can 25. A positive lead 61, serving as the first lead of the current collector 60, is welded to the top surface of the sealing body 26, which serves as the first terminal. A negative lead 62, serving as the second lead of the current collector 60, is welded to the shoulder 25B, which serves as the second terminal. Alternatively, in the energy storage module of this disclosure, the first terminal may be the negative terminal and the second terminal may be the positive terminal.

[0030] In addition, the first terminal is sometimes referred to as the "inner terminal" and the second terminal as the "outer terminal".

[0031] In addition, the positive lead 61 is sometimes referred to as "first lead" or "inner lead", and the negative lead 62 is referred to as "second lead" or "outer lead".

[0032] [Comparative Example: Replacement Method for the Energy Storage Device]

[0033] use Figure 8 The method for replacing the energy storage device 120 in the energy storage module 110 of the comparative example will be described.

[0034] In the energy storage module 110, if one of the multiple energy storage devices 120 malfunctions, sometimes only the malfunctioning energy storage device 120 is replaced. Hereinafter, the method for replacing the energy storage device 120 in the comparative example energy storage module 110 will be described. Furthermore, the comparative example energy storage module 110 and energy storage device 120 have a structure substantially the same as those of the energy storage module 10 and energy storage device 20 described above.

[0035] In step S101, the current collector 160 is removed from all the energy storage devices 120 in the energy storage module 110. More specifically, the positive lead 161 and the negative lead 162 are removed from all the energy storage devices 120. At this time, weld marks WM remain on the positive terminal (top surface of the sealing body 126) and the negative terminal (shoulder 125B of the outer can 125) of the energy storage device 120. In step S102, the upper retainer 140 is removed from the energy storage module 110.

[0036] In step S103, only the malfunctioning energy storage device 120 is removed from the energy storage module 110. In step S104, a replacement energy storage device 120 is installed in the energy storage module 110. In step S105, the upper retainer 140 is installed in the energy storage module 110. At this time, the solder mark WM of the negative lead 162 removed in step S101 sometimes interferes with the upper retainer 140.

[0037] In step S106, a current collector 160 is installed in all the energy storage devices 120 within the energy storage module 110. More specifically, a positive lead 161 and a negative lead 162 are installed in all the energy storage devices 120. At this time, in energy storage devices 120 that are not being replaced, the solder marks WM of the positive lead 161 that were removed in step S101 may sometimes become an obstacle to resoldering.

[0038] Therefore, the structure of the upper retainer 40 of the energy storage module 10 and the connection point of the positive lead 61 will be described below to solve the above-mentioned problems.

[0039] [Upper retainer]

[0040] use Figure 3 and Figure 4 The upper retainer 40 will be explained.

[0041] As described above, the upper retainer 40 is a member that holds the upper side of the energy storage device 20. According to the upper retainer 40, when the positive lead 61 and negative lead 62 are removed from the non-replaceable energy storage device 20 and re-soldered in order to replace one of the energy storage devices 20 in the energy storage module 10, the solder marks WM of the non-replaceable energy storage device 20 will not become a welding obstacle when re-soldering the positive lead 61 or negative lead 62, as will be explained later. Therefore, in the energy storage module 10, one of the energy storage devices 20 can be replaced multiple times, thus maintaining the reliability of the energy storage module 10 for a long period.

[0042] The upper retainer 40 is formed, for example, of a thermoplastic resin. Thermoplastic resins are broadly classified into general-purpose plastics and engineering plastics, and polycarbonate, polybutylene terephthalate, polyethylene, polypropylene, polyamide, ABS, etc., can be used. The upper retainer 40 has a receiving portion 41, a top portion 42, a first opening 43, a second opening 44, and a gap 45, which will be described in detail later. Furthermore, in the upper retainer 40, the receiving portion 41 and the top portion 42 do not necessarily need to be integrally molded. Alternatively, the receiving portion 41 and the top portion 42 can each be formed as separate components, which are then assembled together to form the upper retainer 40.

[0043] In addition, the first opening 43 is sometimes referred to as the "inner opening" and the second opening 44 as the "outer opening".

[0044] The receiving section 41 is the portion that houses the upper end of the energy storage device 20. The receiving section 41 is circular when viewed axially. For example, the receiving section 41 is configured such that six receiving sections 41 surround one receiving section 41 when viewed from above. A top surface 42 is formed in the receiving section 41. The top surface 42 is the portion opposite to the upper end surface (top surface) of the energy storage device 20. A first opening 43, a second opening 44, and a gap 45, which will be described in detail later, are formed in the top surface 42. Furthermore, the first opening 43 and the second opening 44 can be arranged spaced apart from each other, or they can be connected to form a single opening.

[0045] The first opening 43 exposes the top surface of the sealing body 16 of the energy storage device 20, which serves as the positive terminal. A positive lead 61, serving as the first lead, is welded to the top surface of the sealing body 16 exposed through the first opening 43. The first opening 43 is circular in shape at approximately the center of the top portion 42 in a top view (on a second axis (plane) orthogonal to the first axis). The positive lead 61 is welded to a position off-center from the top surface of the sealing body 16 of the energy storage device 20, as will be described later.

[0046] The second opening 44 is the part that exposes the shoulder 25B of the outer casing 25 of the energy storage device 20, which serves as the negative terminal. The negative lead 62 of the current collector plate 60, which serves as the second lead, is welded to the shoulder 25B of the outer casing 25 exposed from the second opening 44.

[0047] The gap 45 is the portion where the weld mark WM of the non-replacement energy storage device 20 is positioned when, in order to replace one of the energy storage devices 20 in the energy storage module 10, the negative lead 62 of the current collector 60 is removed from the shoulder 25B of the outer casing 25 of all the energy storage devices 20, and the negative lead 62 is re-welded to the shoulder 25B of the outer casing 25 of all the energy storage devices 20. This is achieved by rotating the non-replacement energy storage device 20 approximately 180° from a top view (on the second axis (plane) orthogonal to the first axis). Therefore, in the energy storage module 10, one of the energy storage devices 20 can be replaced, thus maintaining the reliability of the energy storage module 10 over a long period.

[0048] The gap 45 is formed as a groove (recess) on the top surface 42 such that it forms a predetermined gap with the shoulder 25B of the outer can 25, which serves as the negative terminal of the second terminal. Multiple gaps 45 are preferably formed. Furthermore, the second opening 44 and the multiple gaps 45 are preferably formed at equal intervals in the circumferential direction of the energy storage device 20 (circular receiving portion 41). In addition, if a weld mark WM is formed on the outer circumferential surface of the energy storage device 20, the gap 45 may also be formed on the inner circumferential surface of the receiving portion 41. Furthermore, the gap 45 can be formed intermittently in the circumferential direction, or it may be a through hole penetrating the top surface 42. Additionally, in order to stably hold the energy storage device 20 within the receiving portion 41, the gap 45 may also be arranged radially separate from the first opening 43 of the energy storage device 20.

[0049] use Figure 5 and Figure 6 The upper retainer 40, which is another example of the implementation method, will be described.

[0050] like Figure 5 As shown, the second opening 44 and a plurality of gaps 45 are formed at 120° intervals on the top surface 42 (outer periphery) of the receiving portion 41. With such a structure, in the case where, in order to replace one of the energy storage devices 20 in the energy storage module 10, the negative lead 62 of the current collector 60 is removed from the shoulder 25B of the outer canister 25 of all the energy storage devices 20 and the negative lead 62 is re-welded to the shoulder 25B of the outer canister 25 of all the energy storage devices 20, the weld mark WM is disposed in the gap 45 by rotating the energy storage device 20 that is not to be replaced approximately 120° in the circumferential direction.

[0051] like Figure 6 As shown, the second opening 44 and a plurality of gaps 45 are formed at 90° intervals on the top surface 42 (outer periphery) of the receiving portion 41. With such a structure, in the case where, in order to replace one of the energy storage devices 20 in the energy storage module 10, the negative lead 62 of the current collector 60 is removed from the shoulder 25B of the outer canister 25 of all the energy storage devices 20 and the negative lead 62 is re-welded to the shoulder 25B of the outer canister 25 of all the energy storage devices 20, the weld mark WM is disposed in the gap 45 by rotating the energy storage device 20 that is not to be replaced approximately 90° in a top view.

[0052] [Lower retainer]

[0053] reuse Figure 1 The lower retainer 50 will be described.

[0054] As described above, the lower retainer 50 is a component that holds the lower side of the energy storage device 20. The lower retainer 50 is formed, for example, from a thermoplastic resin. Thermoplastic resins are broadly classified into general-purpose plastics and engineering plastics, and polyethylene, polypropylene, polyamide, ABS, etc., can be used.

[0055] [Cold Collector]

[0056] use Figure 1 , Figure 3 and Figure 4 The current collector 60 will be described.

[0057] As described above, the current collector 60 is disposed on the upper surface of the upper retainer 40 and is a component that connects the positive terminals, which are the first terminals, to each other and connects the negative terminals, which are the second terminals, to each other. The current collector 60 is formed of a conductive metal plate. The current collector 60 has a positive lead 61 extending from the end of the current collector 60 as a first lead, a negative lead 62 extending from the end of the current collector 60 as a second lead, and an opening 63, which will be described in detail later.

[0058] As described above, the positive lead 61, which serves as the first lead, is the portion that connects the positive terminal (the top surface of the sealing body 26 of the energy storage device 20), which serves as the first terminal, to each other. The positive lead 61 is welded to the top surface of the sealing body 26, which is exposed from the first opening 43 of the upper retainer 40. The positive lead 61 is formed in the shape of a strip, extending into the interior of the opening 63. In a top view (on a second axis (plane) orthogonal to the first axis), the positive lead 61 is welded to a position off-center from the top surface of the sealing body 26 of the energy storage device 20.

[0059] Therefore, when replacing one of the energy storage devices 20 in the energy storage module 10 by removing the positive lead 61 of the current collector 60 from the top surface of the sealing body 26 of all the energy storage devices 20 and then re-soldering the positive lead 61 to the top surface of the sealing body 26 of all the energy storage devices 20, the solder marks WM of the energy storage device 20 that are not to be replaced can be prevented from becoming a welding obstacle when re-soldering the positive lead 61. Thus, in the energy storage module 10, one of the energy storage devices 20 can be replaced multiple times, thereby maintaining the reliability of the energy storage module 10 over a long period.

[0060] As described above, the negative lead 62, which serves as the second lead, is the portion that connects the negative terminals (the shoulder 25B of the outer canister 25 of the energy storage device 20) to each other, which serve as the second terminal. The negative lead 62 is welded to the shoulder 25B of the outer canister 25 of the energy storage device 20, which is exposed from the second opening 44 of the upper retainer 40. The negative lead 62 is formed in the shape of a strip and extends outward from inside the opening 63. The openings 63 are formed at positions corresponding to the first opening 43 of the upper retainer 40.

[0061] [Methods for replacing energy storage devices]

[0062] use Figure 7 The method for replacing the energy storage device 20 in the energy storage module 10 is explained.

[0063] In the energy storage module 10, if one of the multiple energy storage devices 20 malfunctions, sometimes only the malfunctioning energy storage device 20 is replaced. The following describes the method for replacing the energy storage device 20 in the energy storage module 10.

[0064] In step S11, the current collector 60 is removed from all the energy storage devices 20 in the energy storage module 10. More specifically, the positive lead 61 and the negative lead 62 are removed from all the energy storage devices 20. At this time, weld marks WM remain on the positive terminal (top surface of the sealing body 26) and the negative terminal (shoulder 25B of the outer can 25) of the energy storage device 20. In step S12, the upper retainer 40 is removed from the energy storage module 10.

[0065] In step S13, only the malfunctioning energy storage device 20 is removed from the energy storage module 10. In step S14, a replacement energy storage device 20 is installed in the energy storage module 10, and the non-replacement energy storage device 20 is rotated by a predetermined angle (e.g., 180°) from a top-view perspective. In step S15, the upper retainer 40 is installed in the energy storage module 10. At this time, the solder mark WM of the negative lead 62 removed in step S11 is disposed in the gap 45 of the upper retainer 40.

[0066] In step S16, a current collector 60 is installed in all the energy storage devices 20 in the energy storage module 10. More specifically, a positive lead 61 and a negative lead 62 are installed in all the energy storage devices 20. At this time, in the energy storage device 20 that is not to be replaced, since the solder mark WM of the positive lead 61 removed in step S11 is off-center from the top view, it will not become an obstacle when resoldering. Alternatively, in step S11, the energy storage device 20 removed from the current collector 60 may only be the energy storage device 20 that has malfunctioned. In step S16, the energy storage device 20 that is in normal condition and is taken from other energy storage modules 10 is housed in the housing 41 where the malfunctioning energy storage device 20 is located, and a new solder mark WM is formed at a position off from the previous solder mark WM for reuse.

[0067] [Summarize]

[0068] This disclosure is further illustrated by the following embodiments.

[0069] Component 1:

[0070] An energy storage module comprises: an energy storage device, which is cylindrical and has inner terminals and outer terminals; a retainer that holds one end of the energy storage device on a first shaft; and an outer lead wire, wherein...

[0071] The inner terminal and the outer terminal are disposed at one end of the energy storage device.

[0072] The outer terminal is positioned radially outward from the inner terminal of the energy storage device.

[0073] The outer lead is connected to the second terminal.

[0074] The retaining member has a receiving portion for accommodating one end of the energy storage device.

[0075] The receiving section has the following:

[0076] An outer opening that exposes a portion of the outer terminal to which the outer lead is connected; and

[0077] A gap is provided on a second axis orthogonal to the first axis at a position different from the outer opening, and forms a predetermined gap with the outer terminal.

[0078] Composition 2:

[0079] According to the energy storage module described in configuration 1, wherein,

[0080] The energy storage module has multiple energy storage devices.

[0081] The plurality of energy storage devices are the energy storage devices.

[0082] The plurality of energy storage devices are held by the retaining member.

[0083] Composition 3:

[0084] According to the energy storage module described in configuration 1 or 2, wherein,

[0085] Multiple gaps are formed in the receiving part.

[0086] The gap is one of the plurality of gaps.

[0087] The plurality of gaps are arranged circumferentially along the energy storage device.

[0088] Composition 4:

[0089] According to the energy storage module comprising any one of 1 to 3, wherein,

[0090] The outer opening and the plurality of gaps are formed at equal intervals in the circumferential direction.

[0091] Component 5:

[0092] According to the energy storage module comprising any one of 1 to 4, wherein,

[0093] The plurality of gaps are formed in the receiving portion on the surface of the retainer opposite to one end of the energy storage device.

[0094] Composition 6:

[0095] According to the energy storage module comprising any one of 1 to 5, wherein,

[0096] The plurality of gaps are grooves or through holes formed on the surface opposite to one end of the energy storage device.

[0097] Composition 7:

[0098] According to the energy storage module comprising any one of 1 to 6, wherein,

[0099] The energy storage module also has an inner lead wire that connects to the inner terminal.

[0100] The receiving portion of the retainer has an inner opening that exposes a portion of the inner terminal connected to the inner lead.

[0101] The inner lead is connected to the inner terminal at a position on the second axis that is off-center from its center.

[0102] Composition 8:

[0103] According to the energy storage module comprising any one of 1 to 7, wherein,

[0104] In the radial direction of the energy storage device, the inner opening is disposed separately from the gap.

[0105] Composition 9:

[0106] According to the energy storage module comprising any one of 1 to 8, wherein,

[0107] The inner opening is connected to the outer opening.

[0108] Composition 10:

[0109] According to the energy storage module comprising any one of 1 to 9, wherein,

[0110] The energy storage device has the following features:

[0111] An electrode assembly, comprising a first electrode and a second electrode;

[0112] An outer canister having a cylindrical portion for housing the electrode assembly and an opening formed at one end of the cylindrical portion; and

[0113] A sealing element that seals the opening while remaining insulated from the outer can.

[0114] The sealing body is electrically connected to the first electrode.

[0115] The outer can is electrically connected to the second electrode.

[0116] Furthermore, this disclosure is not limited to the above-described embodiments and their variations, and various changes and improvements can be made within the scope of the matters described in the claims of this application.

[0117] Explanation of reference numerals in the attached figures

[0118] 10. Energy storage module; 20. Energy storage device; 21. Positive electrode (first electrode); 22. Negative electrode (second electrode); 23. Separator; 24. Electrode assembly; 25. Outer can; 25A. Tank; 25B. Shoulder (second terminal or outer terminal); 26. Sealing body (first terminal or inner terminal); 27. Positive electrode tab; 28. Negative electrode tab; 29. ​​Gasket; 30. Insulating plate; 40. Upper retainer (retainer); 41. Receiving part; 42. Top part; 43. First opening 44. Second opening (outer opening); 45. Gap; 50. Lower retainer; 60. Current collector; 61. Positive lead (first lead or inner lead); 62. Negative lead (second lead or outer lead); 63. Opening; 110. Energy storage module; 120. Energy storage device; 140. Upper retainer; 160. Current collector; 161. Positive lead (first lead or inner lead); 162. Negative lead (second lead or outer lead).

Claims

1. An energy storage module comprising: an energy storage device, which is cylindrical and has inner terminals and outer terminals; a retainer holding one end of the energy storage device on a first shaft; and an outer lead, wherein, The inner terminal and the outer terminal are disposed at one end of the energy storage device. The outer terminal is positioned radially outward from the inner terminal of the energy storage device. The outer lead is connected to the outer terminal. The retaining member has a receiving portion for accommodating one end of the energy storage device. The receiving section has the following: An outer opening that exposes a portion of the outer terminal to which the outer lead is connected; as well as A gap is provided on a second axis orthogonal to the first axis at a position different from the outer opening, and forms a predetermined gap with the outer terminal.

2. The energy storage module according to claim 1, wherein, The energy storage module has multiple energy storage devices. The plurality of energy storage devices are the energy storage devices. The plurality of energy storage devices are held by the retaining member.

3. The energy storage module according to claim 1, wherein, Multiple gaps are formed in the receiving part. The gap is one of the plurality of gaps. The plurality of gaps are arranged circumferentially along the energy storage device.

4. The energy storage module according to claim 3, wherein, The outer opening and the plurality of gaps are formed at equal intervals in the circumferential direction.

5. The energy storage module according to claim 4, wherein, The plurality of gaps are formed in the receiving portion on the surface of the retainer opposite to one end of the energy storage device.

6. The energy storage module according to claim 5, wherein, The plurality of gaps are grooves or through holes formed on the surface opposite to one end of the energy storage device.

7. The energy storage module according to claim 1, wherein, The energy storage module also has an inner lead wire that connects to the inner terminal. The receiving portion of the retainer has an inner opening that exposes a portion of the inner terminal connecting the inner lead. The inner lead is connected to the inner terminal at a position on the second axis that is off-center from its center.

8. The energy storage module according to claim 7, wherein, In the radial direction of the energy storage device, the inner opening is disposed separately from the gap.

9. The energy storage module according to claim 8, wherein, The inner opening is connected to the outer opening.

10. The energy storage module according to any one of claims 1 to 9, wherein, The energy storage device has the following features: An electrode assembly, comprising a first electrode and a second electrode; An outer can has a cylindrical portion that houses the electrode assembly and has an opening formed at one end of the cylindrical portion; as well as A sealing element that seals the opening while remaining insulated from the outer can. The sealing body is electrically connected to the first electrode. The outer can is electrically connected to the second electrode.

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