Electric power storage module

Abstract

Provided is an electric power storage module (100) comprising a first group (11) that includes a plurality of electric power storage devices (20), a second group (12) that includes a plurality of electric power storage devices (20), and a shared holder (110) that has a plurality of first accommodation portions (111) for accommodating the first group (11) and a plurality of second accommodation portions (112) for accommodating the second group (12), each of the plurality of electric power storage devices (20) having a first end and a second end in a first direction, the plurality of first accommodation portions (111) and the plurality of second accommodation portions (112) being arranged in the first direction, each of the plurality of first accommodation portions (111) accommodating the second-end side of a respective electric power storage device (20) of the first group (11), each of the plurality of second accommodation portions (112) accommodating the second-end side of a respective electric power storage device (20) of the second group (12), the first ends of the plurality of electric power storage devices (20) in the first group (11) being electrically connected to each other, and the first ends of the plurality of electric power storage devices (20) in the second group (12) being electrically connected to each other.

Description

Energy storage module

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

[0002] The power storage module includes a plurality of power storage devices. For example, a power storage module (battery pack) disclosed in Patent Document 1 includes a plurality of stacked battery groups (battery blocks). Each battery group includes a plurality of power storage devices.

[0003] International Publication No. 2022 / 163473

[0004] Energy storage modules will be required to withstand even harsher environments and conditions in the future, which will require energy storage modules with improved performance.

[0005] Therefore, an object of the present disclosure is to provide an energy storage module that can improve performance.

[0006] The energy storage module according to the present disclosure comprises a first group including a plurality of energy storage devices, a second group including a plurality of energy storage devices, and a first holder having a plurality of first housing sections for housing the first group and a plurality of second housing sections for housing the second group, wherein each of the plurality of energy storage devices has a first end and a second end in a first direction, the plurality of energy storage devices in the first group are aligned in a second direction perpendicular to the first direction, the plurality of energy storage devices in the second group are aligned in the second direction, the plurality of first housing sections and the plurality of second housing sections are aligned in the first direction, each of the plurality of first housing sections houses a second end side of the energy storage devices in the first group, and each of the plurality of second housing sections has: The power storage device accommodates the second end sides of the second group of power storage devices, and in a first direction, the second ends of the first group of power storage devices and the second ends of the second group of power storage devices are arranged between the first ends of the first group of power storage devices and the first ends of the second group of power storage devices, and in the first group, the first ends of the multiple power storage devices are electrically connected to each other, and in the second group, the first ends of the multiple power storage devices are electrically connected to each other, and the power storage device is characterized by comprising: a first group including multiple power storage devices that collect current from one side, a second group including multiple power storage devices that collect current from the other side, and a first holder that holds the other sides of the multiple power storage devices in the first group and one side of the multiple power storage devices in the second group.

[0007] According to the energy storage module of the present disclosure, performance can be improved.

[0008] Fig. 1 is a schematic cross-sectional view showing an energy storage module of a first embodiment; Fig. 2 is a cross-sectional view showing an energy storage device according to an embodiment; Fig. 3 is a schematic cross-sectional view showing an energy storage module of a second embodiment; Fig. 4 is a schematic cross-sectional view showing an energy storage module of a third embodiment; Fig. 5 is a schematic cross-sectional view showing an assembly process of an energy storage module of a fourth embodiment; Fig. 6 is a schematic cross-sectional view showing an assembly process of another energy storage module of the fourth embodiment; Fig. 7 is a schematic cross-sectional view showing an energy storage module of a fifth embodiment;

[0009] An example of an embodiment of the present disclosure will be described in detail below. In the following description, specific shapes, materials, directions, numerical values, etc. are examples for facilitating understanding of the present disclosure and can be changed as appropriate according to the application, purpose, specifications, etc. Furthermore, although multiple embodiments will be described below, components common to the respective embodiments will be described using the same reference numerals (e.g., the energy storage device 20).

[0010] [Electricity Storage Module] An electricity storage module 100 according to a first embodiment will be described with reference to FIG.

[0011] The power storage module 100 is mounted on an electric vehicle as a power source for the motor that drives the electric vehicle. Note that the power storage module of the present disclosure is not limited to being mounted on an electric vehicle, and may be used as a power source for motor-driven electric devices such as power tools, power-assisted bicycles, electric motorcycles, electric wheelchairs, electric tricycles, and electric carts. Furthermore, the use of the power storage module of the present disclosure is not limited, and may 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] As will be described in detail later, the energy storage module 100 can improve the performance of the energy storage module 100. In the following, each member may be described using the upper or lower axial side of the energy storage device 20 housed in the energy storage module 100.

[0013] The energy storage module 100 includes a first group 11, a second group 12, a common holder 110 as a first holder, and an upper holder 120 and a lower holder 130 as second holders, each of which will be described in detail later.

[0014] The first group 11 includes a plurality of power storage devices 20 that collect power from the upper side of the power storage module 100 in the first direction. In the first group 11, adjacent power storage devices 20 may be arranged in a second direction perpendicular to the first direction, with the power storage devices 20 being substantially adjacent to each other. For example, the power storage devices 20 may be arranged such that six power storage devices 20 surround one power storage device 20 in a plan view (or arranged in a staggered pattern). Details of the power storage devices 20 will be described later. In the first group 11, each power storage device 20 is arranged with the sealing body 26 as a first end and the bottom side of the exterior can 25 as a second end (see FIG. 2 ). In the first group 11, a positive current collector 13 (first current collector) is connected to the top surface of the sealing body 26, which is the first terminal of each power storage device 20, and a negative current collector 14 (second current collector) is connected to the shoulder of the exterior can 25, which is the second terminal.

[0015] The second group 12 includes a plurality of power storage devices 20 that collect power from the underside of the power storage module 100 in the first direction. In the second group 12, adjacent power storage devices 20 may be arranged substantially adjacent to each other. For example, the power storage devices 20 may be arranged such that six power storage devices 20 surround one power storage device 20 in a plan view (or arranged in a staggered pattern). In the second group 12, each power storage device 20 is arranged with the sealing body 26 as its second end and the bottom side of the exterior can 25 as its first end (see FIG. 2 ). In the second group 12, a positive current collector 13 (third current collector) is connected to the top surface of the sealing body 26, which is the first terminal of each power storage device 20, and a negative current collector 14 (fourth current collector) is connected to the shoulder of the exterior can 25, which is the second terminal.

[0016] The common holder 110 serving as the first holder holds the lower sides of the plurality of power storage devices 20 in the first group 11 and the upper sides of the plurality of power storage devices 20 in the second group 12. The common holder 110 is provided between the first group 11 and the second group 12. If the common holder 110 has electrical insulation properties, it is made of, for example, a thermoplastic resin. Thermoplastic resins are broadly classified into general-purpose plastics and engineering plastics, and polycarbonate, polybutylene terephthalate, etc. are used.

[0017] The common holder 110 has a main body 115 provided between the upper holder 120 and the lower holder 130, a plurality of first storage sections 111 formed as cylindrical recesses in the upper surface of the main body 115, and a plurality of second storage sections 112 formed as cylindrical recesses in the lower surface of the main body 115. The first storage sections 111 store the second end portions of each of the power storage devices 20 in the first group 11 in the first direction. The second storage sections 112 store the second end portions of each of the power storage devices 20 in the second group 12 in the first direction.

[0018] Compared to an energy storage module in which a holder for holding the energy storage devices 20 of the second group 12 and a holder for holding the energy storage devices 20 of the first group 11 are separately provided between the first group 11 and the second group 12, the shared holder 110 does not require clearances, exhaust spaces, insulating members, current collecting members, etc. between the holders, and can reduce the proportion of the volume of the shared holder 110 in the overall volume of the energy storage module 100. This makes it possible to increase the proportion of the volume of the energy storage devices 20 in the overall volume of the energy storage module 100. As a result, the size of the energy storage devices 20 to be accommodated can be increased, and the performance of the energy storage module 100 can be improved.

[0019] The upper holder 120, which serves as a second holder, is provided above the common holder 110 and holds the upper sides of the multiple power storage devices 20 in the first group 11. The upper holder 120 is made of, for example, a thermoplastic resin. The upper holder 120 has a main body 125 and multiple storage sections 121 formed as cylindrical recesses in the lower surface of the main body 125. The storage sections 121 store first end portions of each of the power storage devices 20 in the first direction in the storage sections 121. Furthermore, a positive current collector 13 and a negative current collector 14 that connect (collect current) the power storage devices 20 in the first group 11 in parallel are provided on the upper surface of the upper holder 120. Each of the storage sections 121 has a through hole that forms an opening in the upper surface of the upper holder 120. Multiple leads of the positive current collector 13 and the negative current collector 14 are inserted through the opening, and these leads may be connected to the sealing body 26 or the outer can 25.

[0020] The lower holder 130, which serves as a second holder, is provided below the common holder 110 and holds the lower sides of the multiple power storage devices 20 in the second group 12. The lower holder 130 is made of, for example, a thermoplastic resin. The lower holder 130 has a main body 135 and multiple storage sections 131 formed as cylindrical recesses in the lower surface of the main body 135. The storage sections 131 store the first end portions of each of the power storage devices 20 in the second group 12 in the first direction. Furthermore, the lower surface of the lower holder 130 is provided with positive current collector plates 13 and negative current collector plates 14 that connect (collect current) the power storage devices 20 in the second group 12 in parallel. Each of the multiple storage sections 131 has a through hole that forms an opening in the lower surface of the lower holder 130. Multiple leads of the positive current collector plates 13 and negative current collector plates 14 are inserted through the openings, and these leads may be connected to the sealing body 26 or the outer can 25. In addition, the storage devices 20 of the first group 11 and the storage devices 20 of the second group 12 may be connected in series by electrically connecting the negative electrode collector plate 14 connected to the storage devices 20 of the first group 11 and the positive electrode collector plate 13 connected to the storage devices 20 of the second group 12.

[0021] [Power Storage Device] The power storage device 20 according to the embodiment will be described with reference to FIG.

[0022] In this embodiment, a cylindrical lithium-ion secondary battery is used as the power storage device 20, but a nickel-metal hydride battery, a capacitor, etc. may also be used. The power storage device 20 includes an electrode group 24 in which, for example, 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 solution, a sealing body 26 that seals the opening of the outer can 25 in an insulated state, a foil-shaped positive electrode lead 27 that electrically connects the positive electrode 21 and the sealing body 26, and a negative electrode lead 28 that electrically connects the negative electrode 22 and the outer can 25. An insulating gasket 29 may be disposed between the outer periphery of the sealing body 26 and the inner circumferential surface of the opening of the outer can 25.

[0023] An annular groove 25A is formed on the outer peripheral surface of the outer can 25, on the opening side. This groove 25A is formed as an annular protrusion on the inner peripheral surface of the outer can 25. The gasket 29 and sealing body 26 are placed on this annular protrusion inside the outer can 25. Furthermore, the opening end of the outer can 25 is crimped so that it tilts toward the inside of the outer can 25, with the gasket 29 placed on the inner peripheral side. The crimped opening end and the protrusion sandwich the sealing body 26 in the axial direction via the gasket 29, thereby sealing the opening of the outer can 25.

[0024] 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 pressure. Furthermore, an insulating plate 30 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 or between the electrode group 24 and the protrusion (groove 25A). When the insulating plate 30 is provided, the positive electrode lead 27 may extend through a through-hole formed in the insulating plate 30. The negative electrode lead 28 may extend through a through-hole formed in the insulating plate 30 or may extend by bypassing the insulating plate 30. In the energy storage device 20, as described above, the positive electrode terminal may be provided on the top surface of the sealing body 26, and the negative electrode terminal may be provided on the crimped shoulder of the outer can 25.

[0025] The configuration of the energy storage device of the present disclosure is not limited to the above configuration. The energy storage device of the present disclosure may be configured such that the outer can and a sealing plate that closes the opening of the outer can in a crimped state are electrically connected, and a terminal member connected to the positive electrode as a first terminal is disposed in an insertion hole formed in the bottom of the outer can while being insulated from the outer can. In this case, the sealing plate connected to the negative electrode and the outer can function as a second terminal. In this energy storage device, the side on which the terminal member is disposed in the first direction may be the first end, and the side on which the sealing plate is disposed may be the second end.

[0026] [Electricity Storage Module of Second Embodiment] A power storage module 200 of a second embodiment will be described with reference to FIG.

[0027] The energy storage module 200 includes a first group 11, a second group 12, a common holder 210 as a first holder, an upper holder 220 and a lower holder 230 as second holders, and intermediate holders (an upper intermediate holder 240 and a lower intermediate holder 250) as a third holder. The upper holder 220 and the lower holder 230 have the same configuration as the upper holder 120 and the lower holder 130 described above, and therefore a description thereof will be omitted.

[0028] The shared folder 210 has the same configuration and effects as the above-described shared folder 110. The unique configuration and effects of the shared folder 210 will be described below.

[0029] The common holder 210 has a main body 215 provided between the upper holder 220 and the lower holder 230, a plurality of first storage sections 211 formed as cylindrical recesses on the upper surface of the main body 215, and a plurality of second storage sections 212 formed as cylindrical recesses on the lower surface of the main body 215. The first storage sections 211 store the lowest portions of the three equal parts in the axial direction of each of the power storage devices 20 in the first group 11. The second storage sections 212 store the highest portions of the three equal parts in the axial direction of each of the power storage devices 20 in the second group 12.

[0030] The intermediate holders serving as the third holder include an upper intermediate holder 240 and a lower intermediate holder 250. The upper intermediate holder 240 is provided between the common holder 210 and the upper holder 220 and holds axially intermediate portions of the plurality of power storage devices 20 in the first group 11. The upper intermediate holder 240 is made of, for example, a thermoplastic resin. The upper intermediate holder 240 has a plurality of accommodation portions 241 formed as cylindrical through-holes. The accommodation portions 241 accommodate the axially intermediate portions of each of the power storage devices 20 in the second group 12.

[0031] The lower intermediate holder 250 is provided between the common holder 210 and the lower holder 230 and holds axially intermediate portions of the plurality of power storage devices 20 in the second group 12. The lower intermediate holder 250 is made of, for example, a thermoplastic resin. The lower intermediate holder 250 has a plurality of accommodation portions 251 formed as cylindrical through-holes. The accommodation portions 251 accommodate the axially intermediate portions of each of the power storage devices 20 in the second group 12.

[0032] Here, the common holder 210, the upper holder 220, the lower holder 230, the upper intermediate holder 240, and the lower intermediate holder 250 (hereinafter simply referred to as holders) are processed by die molding. At this time, the thickness of the wall portion between the housing portions of the holder is the sum of the molding limit thickness and the draft formation thickness. Here, if the length of the holder in the axial direction (the mold-drawing direction) is long, the draft formation thickness needs to be increased, and the wall thickness becomes thicker. In this case, the ratio of the volume of the holder to the total volume of the energy storage module 200 increases, and the ratio of the volume of the energy storage device 20 to the total volume of the energy storage module 200 decreases. As a result, the housed energy storage device 20 becomes smaller, and the performance of the energy storage module 200 decreases.

[0033] Therefore, as in this embodiment, by providing an upper intermediate holder 240 between the shared holder 210 and the upper holder 220, and providing a lower intermediate holder 250 between the shared holder 210 and the lower holder 230, the axial (mold-out) lengths of the shared holder 210, upper holder 220, lower holder 230, upper intermediate holder 240 and lower intermediate holder 250 can be shortened.

[0034] This allows the thickness of the holder to be reduced by forming a draft angle, and the thickness of the wall portion to be reduced. As a result, the ratio of the volume of the holder to the overall volume of the energy storage module 200 can be reduced, and the ratio of the volume of the energy storage device 20 to the overall volume of the energy storage module 200 can be increased. As a result, the size of the energy storage device 20 to be accommodated can be increased, and the performance of the energy storage module 200 can be improved.

[0035] [Electricity Storage Module of Third Embodiment] A power storage module 300 of a third embodiment will be described with reference to FIG.

[0036] The energy storage module 300 includes a first group 11, a second group 12, a common holder 310 as a first holder, and an upper holder 320 and a lower holder 330 as second holders. The upper holder 320 and the lower holder 330 have the same configuration as the upper holder 120 and the lower holder 130 described above, and therefore a description thereof will be omitted.

[0037] The shared folder 310 has the same configuration and effects as the above-described shared folder 110. The unique configuration and effects of the shared folder 310 will be described below.

[0038] The thermal conductivity of the common holder 310 is higher than that of the upper holder 320 or the lower holder 330. Furthermore, the thermal conductivity of the common holder 310 is preferably 1.0 W / m·K or higher. The common holder 310 may be made of, for example, a thermoplastic resin having a higher thermal conductivity than that of the upper holder 320 or the lower holder 330. Furthermore, the common holder 310 may be made of, for example, an insulating-coated metal.

[0039] The shared holder 310 allows heat to easily escape to the outside, thereby preventing the shared holder 310 from becoming too hot. This allows heat between the lower sides of the plurality of power storage devices 20 in the first group 11 and the upper sides of the plurality of power storage devices 20 in the second group 12 to easily escape to the outside. As a result, it is possible to prevent heat from building up in the power storage module 300. This prevents or delays input / output restrictions from occurring when the temperature of the power storage device 20 rises due to heat generated during charging and discharging of the power storage module 300 and the upper limit temperature for use is reached, thereby improving safety.

[0040] [Electricity Storage Module of Fourth Embodiment] The electric storage module 400 will be described with reference to Fig. 5 and Fig. 6. Fig. 5 and Fig. 6 schematically show the assembly process of the electric storage module 400.

[0041] As shown in FIG. 5, the power storage module 400 includes a first group 11, a second group 12, a common holder 410 as a first holder, and an upper holder 420 and a lower holder 430 as second holders.

[0042] The common holder 410, the upper holder 420, and the lower holder 430 have the same configurations and effects as the common holder 110, the upper holder 120, and the lower holder 130. The unique configurations and effects of the common holder 410, the upper holder 420, and the lower holder 430 will be described below.

[0043] The shared holder 410 includes a main body portion 415 disposed between the upper holder 420 and the lower holder 430, an upper receiving portion (not shown) formed on the upper side surface of the main body portion 415 and engaging with an engaging portion 422 (described later), and a lower receiving portion (not shown) formed on the lower side surface of the main body portion 415 and engaging with an engaging portion 432 (described later). The upper receiving portion and the lower receiving portion may be recessed or protruding. This eliminates the need for a member protruding from the main body portion 415 above the upper surface (the surface that abuts against the upper holder 420) of the shared holder 410 (the upper surface constitutes the end surface of the shared holder in the first direction). Furthermore, it is also unnecessary to provide a member protruding from the main body portion 415 below the lower surface (the surface that abuts against the lower holder 430) of the shared holder 410 (the lower surface constitutes the end surface of the shared holder in the first direction).

[0044] The upper holder 420 has a main body portion 425 provided on the upper side of the shared holder 410, a first storage portion 421 in which the upper side of the storage device 20 of the first group 11 is stored, and an engagement portion 422 that protrudes from the lower surface of the main body portion 425 (the contact surface with the shared holder 410) and engages with the upper receiving portion of the shared holder 410.

[0045] The lower holder 430 has a main body portion 435 provided on the lower side of the shared holder 410, a first storage portion 431 in which the lower side of the storage device 20 of the second group 12 is stored, and an engagement portion 432 that protrudes from the upper surface of the main body portion 435 (the contact surface with the shared holder 410) and engages with the lower receiving portion of the shared holder 410.

[0046] For example, in the process of assembling the power storage module 400, the power storage devices 20 of the first group 11 are mounted in the common holder 410 (S41), and then the upper holder 420 is attached to the common holder 410 (S42). Meanwhile, the power storage devices 20 of the second group 12 are mounted in the lower holder 430 (S43). Then, the lower holder 430 and the second group 12 are attached to the common holder 410 (S44).

[0047] As described above, no members protrude from the main body 415 of the common holder 410 above the top surface thereof. Furthermore, no members protrude from the main body 415 below the bottom surface thereof. This allows the common holder 410 to stand stably and independently in the assembly steps (S41, S42) of the power storage module 400. As a result, the assembly efficiency of the power storage module 400 can be improved.

[0048] As shown in Fig. 6, the common holder 410 may have a configuration in which only one side (the lower side in Fig. 6) of one surface of the main body 415 does not have any member protruding from the main body 415. In this case, the common holder 410 may have, for example, an engagement portion 413. This allows the common holder 410 to stand stably and independently in the assembly steps (S41, S42) of the power storage module 400. As a result, the assembly efficiency of the power storage module 400 can be improved.

[0049] [Electricity Storage Module of Fifth Embodiment] An electricity storage module 500 will be described with reference to FIG.

[0050] The power storage module 500 includes a first group 11, a second group 12, a shared holder 510 as a first holder, and an upper holder 520 and a lower holder 530 as second holders. The upper holder 520 and the lower holder 530 have the same configuration as the upper holder 120 and the lower holder 130 described above, and therefore a description thereof will be omitted.

[0051] The shared folder 510 has the same configuration and effects as the above-described shared folder 110. The unique configuration and effects of the shared folder 510 will be described below.

[0052] The common holder 510 is formed of a conductive member (formed to contain a conductive material). The common holder 510 may be formed of copper, aluminum, iron, or the like. Furthermore, in the first housing portion 511 of the common holder 510, the outer cans 25 of the power storage devices 20 in the first group 11 are fixed with a conductive adhesive. This electrically connects the common holder 510 and the outer cans 25 of the power storage devices 20 in the first group 11. As a result, the common holder 510 can collect current from the negative electrode terminals of the power storage devices 20 in the first group 11.

[0053] Similarly, in the second housing portion 512 of the common holder 510, the outer cans 25 of the power storage devices 20 in the second group 12 are fixed by a conductive adhesive. This electrically connects the common holder 510 and the outer cans 25 of the power storage devices 20 in the second group 12. As a result, the common holder 510 can collect current from the negative terminals of the power storage devices 20 in the second group 12.

[0054] The common holder 510 can eliminate the need for a negative current collector by providing the common holder 510 with a negative current collecting function. Furthermore, the power storage devices 20 in the first group 11 and the power storage devices 20 in the second group 12 can be connected in parallel via the common holder 510. As a result, the component costs of the power storage module 500 can be reduced. In this case, the power storage devices 20 in the first group 11 and the power storage devices 20 in the second group 12 may be connected in parallel (collect current) only between their first terminals using current collecting members at their respective first ends. Furthermore, the first and second housing portions 511 and 512 formed in the common holder 510 may be offset in the second direction so as to have regions that do not face each other (do not overlap) in the first direction. This configuration reduces the thin region of the common holder 510 in the first direction, thereby increasing the overall rigidity of the common holder 510.

[0055] [Summary] The present disclosure will be further described by the following embodiments. Configuration 1: A power storage device comprising: a first group including a plurality of power storage devices; a second group including a plurality of the power storage devices; and a first holder having a plurality of first housing portions that house the first group and a plurality of second housing portions that house the second group, wherein each of the plurality of power storage devices has a first end and a second end in a first direction, the plurality of power storage devices of the first group are aligned in a second direction that is perpendicular to the first direction, the plurality of power storage devices of the second group are aligned in the second direction, the plurality of first housing portions and the plurality of second housing portions are aligned in the first direction, each of the plurality of first housing portions houses the second end sides of the power storage devices of the first group, and each of the plurality of second housing portions houses the second end sides of the power storage devices of the second group, 10. An energy storage module, wherein the second ends of the energy storage devices of the first group and the second ends of the energy storage devices of the second group are disposed between the first ends of the energy storage devices of the first group and the first ends of the energy storage devices of the second group in the first direction, wherein the first ends of a plurality of the energy storage devices in the first group are electrically connected to one another, and wherein the first ends of a plurality of the energy storage devices in the second group are electrically connected to one another. Aspect 2: The energy storage module according to claim 1, further comprising: a second holder that holds the first ends of the plurality of the energy storage devices in the first group. Aspect 3: The energy storage module according to aspect 2, further comprising: a third holder that is provided between the first holder and the second holder in the first direction and that houses the plurality of the energy storage devices in the first group. Aspect 3: The energy storage module according to aspect 2, wherein the thermal conductivity of the first holder is higher than the thermal conductivity of the second holder. Configuration 4: The energy storage module according to configuration 2, wherein the first holder has no member protruding from a contact surface that contacts the second holder in the first direction.Configuration 6: The energy storage module according to configuration 1, wherein the first holder includes a conductive material, and the first group of the plurality of energy storage devices is electrically connected to one another via the first holder.Configuration 7: The energy storage module according to configuration 1, wherein the first holder includes a conductive material, and the first group of the plurality of energy storage devices and the second group of the plurality of energy storage devices are electrically connected via the first holder. Configuration 8: The energy storage module according to configuration 1, wherein a first terminal and a second terminal are provided at the first end of the first group of the energy storage devices and the first end of the second group of the energy storage devices, respectively, and further comprising: a first current collecting member electrically connected to the first terminal of the first group of the energy storage devices, a second current collecting member electrically connected to the second terminal of the first group of the energy storage devices, a third current collecting member electrically connected to the first terminal of the second group of the energy storage devices, and a fourth current collecting member electrically connected to the second terminal of the second group of the energy storage devices. a first terminal disposed within the opening and electrically connected to the first electrode, the first terminal being electrically connected to the second electrode, the second terminal being electrically connected to the first end side, the second terminal being electrically connected to the second electrode, the first terminal being electrically connected to the second electrode, the second terminal being electrically connected to the second electrode, the first terminal being electrically connected to the first end side, the second terminal being electrically connected to the second electrode, the second terminal being electrically connected to the second electrode, the second terminal being electrically connected to the second electrode, the second terminal being electrically connected to the second electrode, the second terminal being electrically connected to the second end side, the second terminal being electrically connected to the second electrode, the second terminal being electrically connected to the second electrode, the second terminal being electrically connected to the second electrode, the second terminal being electrically connected to the first end side, the second terminal being electrically connected to the second electrode ... electrode, the second terminal being electrically connected to the second electrode, the second terminal being electrically connected to the first electrode, the second terminal being electrically connected to the second electrode, the second terminal being electrically connected to the first electrode, the second terminal

[0056] It should be noted that the present disclosure is not limited to the above-described embodiments and their variations, and it goes without saying that various modifications and improvements are possible within the scope of the matters described in the claims of the present application.

[0057] REFERENCE SIGNS LIST 11 First group, 12 Second group, 13 Positive electrode current collector, 14 Negative electrode current collector, 20 Electricity storage device, 21 Positive electrode (first electrode), 22 Negative electrode (second electrode), 23 Separator, 24 Electrode group, 25 Outer can, 25A Groove, 26 Sealing body, 27 Positive electrode lead, 28 Negative electrode lead, 29 Gasket, 30 Insulating plate, 100, 200, 300, 400, 500 Electricity storage module, 110, 210, 310, 410, 510 Shared holder (first holder), 111 First storage section, 112 Second storage section, 211, 311, 411, 511 Storage section, 115, 215, 315, 415, 515 Main body, 120, 220, 320, 420, 520 Upper holder (second holder), 121: storage portion, 125, 425: main body portion, 130, 230, 330, 430, 530 Lower holder (second holder), 131: storage portion, 135, 435: main body, 240 Upper intermediate holder (third holder), 241: storage portion, 250 Lower intermediate holder (third holder), 251: storage portion, 413: engaging portion, 422: engaging portion, 432: engaging portion

Claims

1. A power storage device comprising: a first group including a plurality of power storage devices; a second group including a plurality of the power storage devices; and a first holder having a plurality of first storage sections that store the first group and a plurality of second storage sections that store the second group, wherein each of the plurality of power storage devices has a first end and a second end in a first direction, the plurality of power storage devices of the first group are aligned in a second direction that is perpendicular to the first direction, the plurality of power storage devices of the second group are aligned in the second direction, the plurality of first storage sections and the plurality of second storage sections are aligned in the first direction, each of the plurality of first storage sections stores the second end sides of the power storage devices of the first group, and each of the plurality of second storage sections stores the second end sides of the power storage devices of the second group, a storage module in which, in the first direction, the second ends of the power storage devices of the first group and the second ends of the power storage devices of the second group are arranged between the first ends of the power storage devices of the first group and the first ends of the power storage devices of the second group, the first ends of a plurality of the power storage devices in the first group are electrically connected to each other, and the first ends of a plurality of the power storage devices in the second group are electrically connected to each other.

2. The energy storage module according to claim 1, further comprising a second holder that holds the first end sides of the first group of the plurality of energy storage devices.

3. An energy storage module according to claim 2, further comprising a third holder disposed between the first holder and the second holder in the first direction and accommodating the first group of multiple energy storage devices.

4. The energy storage module according to claim 2, wherein the thermal conductivity of the first holder is higher than the thermal conductivity of the second holder.

5. An energy storage module according to claim 2, wherein the first holder has no member protruding from a contact surface that contacts the second holder in the first direction.

6. An energy storage module according to claim 1, wherein the first holder includes a conductive material, and the first group of multiple energy storage devices are electrically connected to each other via the first holder.

7. An energy storage module according to claim 1, wherein the first holder includes a conductive material, and the first group of multiple energy storage devices and the second group of multiple energy storage devices are electrically connected via the first holder.

8. An energy storage module according to claim 1, wherein a first terminal and a second terminal are provided at the first end of the energy storage device of the first group and the first end of the energy storage device of the second group, respectively, and further comprising: a first current collecting member electrically connected to the first terminal of the energy storage device of the first group; a second current collecting member electrically connected to the second terminal of the energy storage device of the first group; a third current collecting member electrically connected to the first terminal of the energy storage device of the second group; and a fourth current collecting member electrically connected to the second terminal of the energy storage device of the second group.

9. An energy storage module according to claim 1, wherein the first group of multiple energy storage devices and the second group of multiple energy storage devices each comprise: an outer can with an opening; an electrode body housed in the outer can and including a first electrode and a second electrode; and a first terminal disposed within the opening and electrically connected to the first electrode, wherein the outer can is a second terminal electrically connected to the second electrode, and the first terminal is disposed on the first end side.

10. The energy storage module according to claim 1, wherein the second housing portion has an area that does not overlap with the first housing portion in the first direction.

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