Power storage device module, module connection body, method for manufacturing power storage device module, and module case

Abstract

To form, for example, an accommodation region for a power storage device in a case, with a simple constitution, and further to restrict the movement of the power storage device.SOLUTION: A power storage device module (2) includes: a first case (4-1) including a plurality of first cover parts (22-1) and a first partition part (26-1) formed between the first cover parts and partitioning a first accommodation region (16-1) that accommodates a first power storage device (6-1); and a second case (4-2) including a plurality of second cover parts (22-2) and a second partition part (26-2) formed between the second cover parts and partitioning a second accommodation region (16-2) that accommodates a second power storage device (6-2), the second case being bonded to the first case. The first accommodation region is formed by the first cover parts, the first partition part, and the second partition part, and the second accommodation region is formed by the second cover parts, the second partition part, and the first partition part.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The technology of the present disclosure relates to a power storage device module, a module connector, a method for manufacturing a power storage device module, and a module case.

Background Art

[0002] A power storage device module includes a plurality of combined power storage devices. The plurality of power storage devices are housed in a housing, and spacers are arranged above and below the power storage devices. Therefore, it is known that the power storage devices are fixed to the housing (for example, Patent Documents 1 and 2).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, the fixing mechanism of the power storage device may increase the size of the power storage device module. For example, since there is a limit to the thinness of the spacer, there is a problem that the module becomes larger due to the gap between the power storage devices and the gap between the power storage device and the housing.

[0005] In addition, when the number of components constituting the power storage device module increases, there is a problem that the burden of assembling the power storage device module increases.

[0006] Patent Documents 1 and 2 do not disclose or suggest such problems, and the configurations disclosed in Patent Documents 1 and 2 cannot solve such problems.

[0007] Therefore, the present disclosure aims to form an accommodation area for a power storage device within a case with a simple configuration, and further to restrict the movement of the power storage device. **Means for Solving the Problem**

[0008] To achieve the above object, according to a first aspect of the present disclosure, a power storage device module includes a plurality of power storage devices including a first power storage device and a second power storage device, a plurality of first cover portions, and a first partition portion formed between the first cover portions and partitioning a first accommodation area for accommodating the first power storage device, a first case including the first partition portion, a plurality of second cover portions, and a second partition portion formed between the second cover portions and partitioning a second accommodation area for accommodating the second power storage device, and a second case coupled to the first case. The first accommodation area is formed by the first cover portion, the first partition portion, and the second partition portion, and the second accommodation area is formed by the second cover portion, the second partition portion, and the first partition portion.

[0009] In the above power storage device module, the movement of the first power storage device may be restricted by the first cover portion, the first partition portion, and the second partition portion, and the movement of the second power storage device may be restricted by the second cover portion, the second partition portion, and the first partition portion.

[0010] In the above power storage device module, the first accommodation area and the second accommodation area may form a staggered arrangement.

[0011] In the above power storage device module, the plurality of power storage devices may include a plurality of the first power storage devices arranged in a first row and a plurality of the second power storage devices arranged in a second row parallel to the first row, and the first power storage device and the second power storage device may form a staggered arrangement.

[0012] In the above-described power storage device module, the distance from the outer end of the first case to the tip of the first partition portion may be smaller than the distance obtained by the sum of the diameter of the power storage device having a cylindrical shape and the thickness of the first cover portion, or the distance from the outer end of the second case to the tip of the second partition portion may be smaller than the distance obtained by the sum of the diameter of the power storage device and the thickness of the second cover portion.

[0013] In the above-described power storage device module, when the power storage device has a cylindrical shape, the radius of the power storage device is r, and the gap between the adjacent first power storage devices is 2α, the accommodation width AW of the power storage device may have a value represented by the following formula. 2r + [(2r) 2 -(r + α) 2 1 / 2 <AW < 2r + √3×(r + α)

[0014] In the above-described power storage device module, the second case may have the same shape as the first case.

[0015] In the above-described power storage device module, the first partition portion may be connected to a first joint portion between the adjacent first cover portions, and the second partition portion may be connected to a second joint portion between the adjacent second cover portions.

[0016] In the above-described power storage device module, first unevenness may be formed on the outer surface of the first case by the first cover portion, second unevenness may be formed on the outer surface of the second case by the second cover portion, and the second unevenness may be engageable with the first unevenness.

[0017] ​The above-described power storage device module may further include a first terminal connected to the first power storage device and protruding outward through the first case, and a second terminal connected to the second power storage device and protruding outward through the second case. The first terminal may be connectable to another second terminal of another power storage device module installed on the outer surface of the first case, and the second terminal may be connectable to another first terminal of another power storage device module installed on the outer surface of the second case.

[0018] The above-described power storage device module may further include a bus bar holder installed on the plurality of power storage devices and in which a bus bar for connecting electrode terminals of the plurality of power storage devices is disposed.

[0019] To achieve the above object, according to a second aspect of the present disclosure, a module connection body includes the power storage device module and at least one of the other power storage device modules. The first terminal is connected to the other second terminal of the other power storage device module, or the second terminal is connected to the other first terminal of the other power storage device module.

[0020] To achieve the above object, according to a third aspect of the present disclosure, a method for manufacturing a power storage device module includes: a step of manufacturing or preparing a plurality of power storage devices including a first power storage device and a second power storage device; a step of manufacturing or preparing a first case including a plurality of first cover portions and a first partition portion formed between the first cover portions and partitioning a first accommodation region for accommodating the first power storage device; a step of manufacturing or preparing a second case including a plurality of second cover portions and a second partition portion formed between the second cover portions and partitioning a second accommodation region for accommodating the second power storage device; and a step of attaching the second case to the first case such that the first power storage device and the second power storage device are respectively accommodated in the first accommodation region and the second accommodation region. The first accommodation region is formed by the first cover portion, the first partition portion, and the second partition portion, and the second accommodation region is formed by the second cover portion, the second partition portion, and the first partition portion.

[0021] To achieve the above object, according to a fourth aspect of the present disclosure, a module case includes: a first case including a plurality of first cover portions and a first partition portion formed between the first cover portions and partitioning a first accommodation region for accommodating a first power storage device; and a second case including a plurality of second cover portions and a second partition portion formed between the second cover portions and partitioning a second accommodation region for accommodating a second power storage device, the second case being coupled to the first case. The first accommodation region is formed by the first cover portion, the first partition portion, and the second partition portion, and the second accommodation region is formed by the second cover portion, the second partition portion, and the first partition portion.

Advantages of the Invention

[0022] According to the technology of the present disclosure, any of the following effects can be obtained.

[0023] (1) The accommodation area of the power storage device can be formed by attaching two cases. For example, the movement of the first power storage device and the second power storage device can be restricted, and a simple movement suppression structure of the power storage device can be formed by attaching two cases.

[0024] (2) The number of components of the power storage device module is small, the burden of component preparation, assembly burden, inventory management burden, etc. are suppressed, and labor saving is achieved.

[0025] (3) There is no need to install a spacer between the adjacent first power storage device and the second power storage device. Therefore, the gap between the first power storage device and the second power storage device can be narrowed, and the power storage device module or the module case can be miniaturized.

Brief Description of the Drawings

[0026]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Embodiments for Carrying Out the Invention

[0027] FIG. 1 shows an example of a power storage device module according to the first embodiment. FIG. 2 is a cross-sectional view and an enlarged view of the power storage device module. The enlarged view is an enlarged view of the IIB portion shown at A in FIG. 2. In order to illustrate the accommodation region of the power storage device 6, the illustration of some of the power storage devices 6 is omitted in FIG. 2. FIG. 3 is an exploded perspective view of the power storage device module. FIG. 4 is a view showing the module case. The configurations shown in FIGS. 1 to 4 are examples, and the technology of the present disclosure is not limited to such configurations. In the present disclosure, the X-axis direction, the Y-axis direction, and the Z-axis direction shown in FIG. 1 are defined as the length direction, the width direction, and the height direction of the power storage device module 2 and the module case 4, respectively. Further, in the present disclosure, the electrode terminal side of the power storage device module 2 is referred to as the upper part, and the opposite side is referred to as the lower part.

[0028] The power storage device module 2 has a power storage function and a discharge function, and is used as a power source for products such as electrical products, electronic devices, vehicles, and flying objects. The power storage device module 2 includes a module case 4, a plurality of power storage devices 6, a first terminal 8-1 (hereinafter referred to as "terminal 8-1"), a second terminal 8-2 (hereinafter referred to as "terminal 8-2"), a plurality of bus bars 10, a cross bus bar 11, a balance circuit 12, and fasteners 14, 15 such as screws. The plurality of power storage devices 6 includes a plurality of first power storage devices 6-1 (hereinafter referred to as "power storage devices 6-1") and a plurality of second power storage devices 6-2 (hereinafter referred to as "power storage devices 6-2").

[0029] The module case 4 is a resin member containing, for example, a thermoplastic resin and has insulation properties. The module case 4 houses the power storage device 6 inside and protects the power storage device 6. The module case 4 includes a first case 4-1 (hereinafter referred to as "case 4-1") and a second case 4-2 (hereinafter referred to as "case 4-2"). The case 4-2 is, for example, the case 4-1 rotated 180 degrees around the Z-axis shown in FIG. 1 and has, for example, the same shape as the case 4-1. When the case 4-2 is attached to the case 4-1, the case 4-2 is joined to the case 4-1, and an accommodation region 16 for housing the power storage device 6 is formed inside the module case 4. The accommodation region 16 includes a first accommodation region 16-1 (hereinafter referred to as "accommodation region 16-1") formed on the case 4-1 side and a second accommodation region 16-2 (hereinafter referred to as "accommodation region 16-2") formed on the case 4-2 side. The power storage device 6-1 is installed and housed in the accommodation region 16-1, and the power storage device 6-2 is installed and housed in the accommodation region 16-2.

[0030] The case 4-1 includes, for example, a plurality of first cover portions 22-1 (hereinafter referred to as "cover portions 22-1"), a plurality of first joint portions 24-1 (hereinafter referred to as "joint portions 24-1"), a plurality of first partition portions 26-1 (hereinafter referred to as "partition portions 26-1"), and a frame portion (that is, an upper frame 32, a lower frame 34, and side frames 36, 38).

[0031] The cover parts 22-1 are arranged in the longitudinal direction of the module case 4. The cover parts 22-1 have a height that matches or substantially matches, for example, the height of the power storage device 6, and have an inner surface shape that matches or substantially matches, for example, the side surface shape of the power storage device 6. Therefore, the side surface of the power storage device 6-1 can be installed on the cover part 22-1, and the cover part 22-1 can partially cover the side surface of the installed power storage device 6-1. The cover part 22-1 partially covers the side surface of the power storage device 6-1 and restricts the power storage device 6-1 accommodated in the accommodation region 16-1 from moving at least outward in the module case 4. The plurality of cover parts 22-1 form first unevenness on the outer surface of the case 4-1 and are in surface contact with the power storage device 6-1. Therefore, the case 4-1 has higher heat dissipation than a case with a flat outer surface, a case that contacts the power storage device at points, and a case that does not contact the power storage device. The cover part 22-1 is, for example, a first curved part having a curved concave surface on the inner surface, and covers a part of the side surface of the power storage device 6-1 having a cylindrical shape with the curved concave surface, restricting the power storage device 6-1 from moving outward and in the longitudinal direction of the module case 4. By protruding the outer surface of the case 4-1 corresponding to the curved concave surface, first unevenness can be formed on the outer surface of the case 4-1.

[0032] The joint part 24-1 is arranged between adjacent cover parts 22-1 and joints the adjacent cover parts 22-1. The joint part 24-1 may have a rib 30 on the outer surface of the case 4-1. The rib 30 joints the outer surfaces of the adjacent cover parts 22-1. The joint part 24-1 having the rib 30 joints the adjacent cover parts 22-1 in the width direction and the height direction of the module case 4, enhancing the rigidity of the case 4-1 and the module case 4.

[0033] The partition part 26-1 includes, for example, a partition plate, is connected to the joint part 24-1 at the base part 28, extends in the width direction of the module case 4, and has a tip part adjacent to the accommodation region 16-2. The partition part 26-1 is formed between adjacent cover parts 22-1 and is arranged between adjacent power storage devices 6-1. The partition part 26-1 partitions the accommodation region 16-1 and restricts the movement of the power storage device 6-2 accommodated in the accommodation region 16-2 toward the case 4-1 side by the tip part. The partition part 26-1 may restrict the movement of the power storage device 6-1 in the length direction of the module case 4. The cover part 22-1, the partition part 26-1, and the second partition part 26-2 (hereinafter referred to as "partition part 26-2") of the case 4-2 form an accommodation part for the power storage device 6-1, and the accommodation region 16-1 is formed by the cover part 22-1 and the partition parts 26-1 and 26-2.

[0034] The plurality of cover parts 22-1 and the plurality of partition parts 26-1 are respectively arranged, for example, at equal intervals. When the radius of the power storage device 6 having a cylindrical shape is r and the gap between adjacent power storage devices 6-1 is 2α, the center interval CI between the cover part 22-1 (for example, the first curved part) and the partition part 26-1 is represented by, for example, the following formula (1). CI = 2r + 2α ···(1)

[0035] When the thickness of the base part 28 of the partition part 26-1 is 2α, the power storage device 6-1 can be arranged between adjacent partition parts 26-1, and the movement of the power storage device 6-1 in the length direction of the module case 4 can be restricted by the partition part 26-1. Considering the tolerances of the case 4-1 and the power storage device 6, the thickness of the base part 28 of the partition part 26-1 may be slightly thinner than 2α.

[0036] The thickness of the partition portion 26-1 gradually decreases, for example, from the base portion 28 toward the tip portion. Therefore, the opening on the tip portion side is larger than the diameter of the power storage device 6-1, facilitating the insertion of the power storage device 6-1 between the partition portions 26-1 and into the accommodation region 16-1. The thickness of the partition portion 26-1 may be a constant thickness from the base portion 28 to the tip portion. It may gradually increase from the base portion 28 toward the tip portion, or may be irregular and non-uniform.

[0037] The frame portion includes an upper frame 32, a lower frame 34, and side frames 36, 38, is disposed outside the plurality of cover portions 22-1, and surrounds the plurality of cover portions 22-1. The frame portion has a width W represented, for example, by the following formula (2) using the inner width IW and the thickness T. The inner width IW is the distance from the bottom of the cover portion 22-1 on the inner surface side of the case 4-1 to the end of the frame portion (for example, the maximum inner width of the case 4-1), and the thickness T is the thickness of the cover portion 22-1 at the bottom of the cover portion 22-1. The width W of this frame portion is defined as the width of the case 4-1. W = IW + T ···(2)

[0038] The upper frame 32 includes a first engaging portion 40-1, a second engaging portion 40-2, a first terminal hole 42, and a second terminal hole 44. The first engaging portion 40-1 is, for example, a protrusion used for engagement, and the second engaging portion 40-2 has a slit that engages with the first engaging portion 40-1, for example. The position of the second engaging portion 40-2 is adjusted so that the slit formed in the second engaging portion 40-2 engages with the first engaging portion 40-1 of the case 4-1 rotated 180 degrees about the Z axis. Therefore, the first engaging portion 40-1 and the second engaging portion 40-2 of the case 4-1 engage with the second engaging portion 40-2 and the first engaging portion 40-1 of the case 4-2, respectively.

[0039] The first terminal hole 42 is formed at the first end of the upper frame 32, and the second terminal hole 44 is formed at the second end of the upper frame 32. The first terminal hole 42 is formed above the cover portion 22-1 on the first end side. For example, a terminal 8-1 connected to the power storage device 6-1 protrudes from the first terminal hole 42 through the first terminal hole 42. The second terminal hole 44 is formed outside the cover portion 22-1 on the second end side in the length direction of the module case 4. When the case 4-1 is used as the case 4-2, for example, a terminal 8-2 connected to the power storage device 6-2 protrudes from the second terminal hole 44 through the second terminal hole 44.

[0040] The lower frame 34 includes a first engaging portion 40-1, a second engaging portion 40-2, a leg portion 46, and an installation portion 48. The first engaging portion 40-1 and the second engaging portion 40-2 of the lower frame 34 each have a configuration similar to, for example, the first engaging portion 40-1 and the second engaging portion 40-2 of the upper frame 32. The first engaging portion 40-1 of the lower frame 34 is disposed, for example, directly below the first engaging portion 40-1 of the upper frame 32, and the second engaging portion 40-2 of the lower frame 34 is disposed, for example, directly below the second engaging portion 40-2 of the upper frame 32. The positions of the first engaging portion 40-1 and the second engaging portion 40-2 of the lower frame 34 may be independent of the positions of the first engaging portion 40-1 and the second engaging portion 40-2 of the upper frame 32.

[0041] The leg portion 46 has a protruding amount equal to or greater than the protruding amounts of the first engaging portion 40-1 and the second engaging portion 40-2 with respect to the surface of the lower frame 34. Therefore, when the power storage device module 2 is installed on the installation plane, the leg portion 46 contacts the installation plane and the power storage device module 2 is stabilized.

[0042] The installation portion 48 is used to fix the power storage device module 2 to the installation plane. The installation portion 48 has a through groove or a through hole through which a fastener 108 (FIG. 8) such as a screw is inserted. The installation portion 48 has a protruding amount equal to or substantially equal to the protruding amount of the leg portion 46 with respect to the surface of the lower frame 34. Therefore, when the power storage device module 2 is installed on the installation plane, the installation portion 48 also contacts the installation plane and the power storage device module 2 is stabilized.

[0043] The side frame 36 has a first fixing member 50-1 formed at the central portion in the height direction. The first fixing member 50-1 has, for example, holes for fixing the fastener 14.

[0044] The side frame 38 has a frame plate 52 and a second fixing member 50-2 formed at the central portion in the height direction. The frame plate 52 has, for example, a curved surface along the adjacent accommodation region 16-2, and extends the length of the case 4-1 in the length direction of the module case 4. The second fixing member 50-2 is disposed at the end of the frame plate 52 and overlaps the first fixing member 50-1 of the case 4-2. When the fastener 14 passes through the second fixing member 50-2 and is fixed to the first fixing member 50-1, the case 4-2 is fixed to the case 4-1.

[0045] As described above, the case 4-2 has, for example, the same shape as the case 4-1. The description of the case 4-2 is omitted. In order to distinguish between the case 4-1 and the case 4-2, the cover portion 22-1, the joint portion 24-1, the partition portion 26-1, the first curved portion and the first unevenness are respectively referred to as a second cover portion 22-2 (hereinafter referred to as "cover portion 22-2"), a second joint portion 24-2 (hereinafter referred to as "joint portion 24-2"), a partition portion 26-2, a second curved portion and a second unevenness in the case 4-2.

[0046] The cases 4-1 and 4-2 each have a frame plate 52. Therefore, when the case 4-2 is attached to the case 4-1, in the length direction of the module case 4, the position of the cover portion 22-2 is shifted by a distance D0 with respect to the position of the cover portion 22-1. The value of the distance D0 is, for example, the same as or approximately the same as r + α. Due to the shift of the distance D0, the cover portion 22-1 and the cover portion 22-2 form a staggered arrangement. Further, the partition portion 26-1 of the case 4-1 faces the central portion of the accommodation region 16-2 and the central portion of the cover portion 22-2 (for example, the bottom of the second curved portion), and the partition portion 26-2 of the case 4-2 faces the central portion of the accommodation region 16-1 and the central portion of the cover portion 22-1 (for example, the bottom of the first curved portion).

[0047] Here, when the power storage device 6 having a cylindrical shape is accommodated in the module case 4, the distance D1 from the outer end OE of the case 4-1 to the tip of the partition portion 26-1 is preferably smaller than, for example, the distance D2 obtained by the sum of the diameter of the power storage device 6 and the thickness T of the cover portion 22-1. The outer end OE of the case 4-1 is defined as the outer end of the width of the case 4-1 (that is, the width W), and forms a line or surface that contacts the outer surfaces of the plurality of cover portions 22-1. Similarly, the distance D1 from the outer end of the case 4-2 to the tip of the partition portion 26-2 is preferably smaller than, for example, the distance D2 obtained by the sum of the diameter of the power storage device 6 and the thickness T of the cover portion 22-2. The outer end of the case 4-2 is defined as the outer end of the width of the case 4-2 (that is, the width W), and forms a line or surface that contacts the outer surfaces of the plurality of cover portions 22-2. When the distance D1 is smaller than the distance D2, the power storage device 6 can be efficiently arranged, and the width of the power storage device module 2, or the accommodation width AW, can be suppressed.

[0048] Further, when the power storage device 6 having a cylindrical shape is accommodated in the module case 4, the inner width IW preferably has a value within the range represented by the following formula (3), for example. In formula (3), "2×IW" is the accommodation width AW of the power storage device 6, and in the width direction, it is the accommodation width from the central portion of the cover portion 22-1 to the central portion of the cover portion 22-2 of the case 4-2. 2r + {(2r) 2 -(r + α) 2} 1 / 2 <2×IW < 2r + √3×(r + α) ···(3)

[0049] The accommodation width AW is 2r + {(2r) 2 -(r + α) 2} 1 / 2If it is, the gap between the adjacent power storage devices 6-1 and 6-2 becomes zero, and if the accommodation width AW is 2r + √3×(r + α), the gap between the adjacent power storage devices 6-1 and 6-2 becomes 2α. When the inner width IW and the accommodation width AW are adjusted so as to satisfy the formula (3), the gap between the power storage devices 6-1 and 6-2 can be made narrower than the gap between the power storage devices 6-1. Also, the power storage device 6-1 can be made non-contact with the power storage device 6-2. That is, the widths of the power storage device module 2 and the module case 4 are suppressed, and a gap can be formed between the power storage devices 6-1 and 6-2. Since the partition portions 26-1 and 26-2 are adjacent to the accommodation regions 16-2 and 16-1 respectively, when the inner width IW and the accommodation width AW are adjusted, the lengths of the partition portions 26-1 and 26-2 in the width direction of the module case 4 are also adjusted.

[0050] The power storage device 6 has a power storage function and is, for example, an electrolytic capacitor or an electric double layer capacitor. The power storage devices 6-1 and 6-2 are arranged in a row respectively, and the second row formed by the power storage device 6-2 is parallel to the first row formed by the power storage device 6-1. The power storage devices 6 are integrated by the bus bar 10 and the cross bus bar 11 to form a joined body of the power storage devices 6. The power storage device 6-1 is arranged between the cover portion 22-1 and the partition portion 26-2 and between the partition portions 26-1, and the movement of the power storage device 6-1 is restricted by the cover portion 22-1 and the partition portions 26-1, 26-2. The movement of the power storage device 6-1 may be restricted by the cover portion 22-1 and the partition portion 26-2. The power storage device 6-2 is arranged between the cover portion 22-2 and the partition portion 26-1 and between the partition portions 26-2, and the movement of the power storage device 6-2 is restricted by the cover portion 22-2 and the partition portions 26-1, 26-2. The movement of the power storage device 6-2 may be restricted by the cover portion 22-2 and the partition portion 26-1. The power storage device 6-1 may be fixed by contact with the cover portion 22-1, the partition portion 26-2, etc., and the power storage device 6-2 may be fixed by contact with the cover portion 22-2, the partition portion 26-1, etc.

[0051] As described above, since the cover portions 22-1 and 22-2 form a staggered arrangement, the power storage devices 6-1 and 6-2 also form a staggered arrangement, and the accommodation regions 16-1 and 16-2 also form a staggered arrangement. For example, in the power storage device 6 having a cylindrical shape, a part of the power storage device 6-1 enters a depression formed by the adjacent power storage device 6-2, and a part of the power storage device 6-2 enters a depression formed by the adjacent power storage device 6-1. Therefore, the widths of the power storage device module 2 and the module case 4 are suppressed. The power storage device 6 includes an exterior case 54, a power storage element, an electrolytic solution, a sealing member, electrode terminals, and the like.

[0052] The exterior case 54 is, for example, a cylindrical case having a bottom and contains a metal such as aluminum. The power storage element and the electrolytic solution are inserted inside the exterior case 54. The sealing member is installed at the opening of the exterior case 54 and closes the inside of the exterior case 54. The sealing member is, for example, an insulating plate containing an insulating resin.

[0053] The electrode terminals are, for example, metal members having conductivity. The electrode terminals are integrally attached to the sealing member by, for example, insert molding. The electrode terminals include a first terminal and a second terminal. The first terminal is, for example, an anode terminal and is connected to the anode foil of the power storage element. The second terminal is, for example, a cathode terminal and is connected to the cathode foil of the power storage element. The electrode terminals protrude from the outer surface of the sealing member. The outer ends of the electrode terminals have, for example, female threads for fixing the terminals 8-1, 8-2, the bus bar 10, or the cross bus bar 11.

[0054] A plurality of power storage devices 6-1 are arranged such that a first terminal and a second terminal are arranged, for example, alternately on a straight line, and a plurality of power storage devices 6-2 are arranged such that the first terminal and the second terminal are arranged, for example, alternately on a straight line. The number of power storage devices 6-1 is, for example, six, and the number of power storage devices 6-2 is the same as the number of power storage devices 6-1. The number of power storage devices 6-1 and the number of power storage devices 6-2 may be one or more and five or less, or seven or more.

[0055] Terminals 8-1 and 8-2 are metal plates such as aluminum plates and copper plates. Terminal 8-1 is installed on the first terminal of the power storage device 6-1 arranged at the end, and terminal 8-2 is installed on the second terminal of the power storage device 6-2 arranged at the end. Terminal 8-1 may be installed on the second terminal, and terminal 8-2 may be installed on the first terminal. Terminals 8-1 and 8-2 have through holes at positions corresponding to the first terminal or the second terminal, and are fixed and connected to the first terminal or the second terminal by a stopper 15. Terminal 8-1 extends from the connection portion with the first terminal or the second terminal toward the outside of the case 4-1, penetrates the first terminal hole 42, and protrudes outside the case 4-1.

[0056] Terminal 8-2 has an L shape and includes a crank 56. Terminal 8-2 extends from the connection portion with the first terminal or the second terminal toward the end of the side frame 38, then extends toward the outer surface of the case 4-2, penetrates the second terminal hole 44, and protrudes outside the case 4-2. Since terminal 8-2 extends from the connection portion toward the end of the side frame 38, as shown in A of FIG. 5, the protruding portion of terminal 8-2 is arranged on a connection line CL that passes through the protruding portion of terminal 8-1 and extends in the width direction of the power storage device module 2. Since terminal 8-2 includes a crank 56, as shown in B of FIG. 5, the level L2 of the protruding portion of terminal 8-2 is different from the level L1 of the protruding portion of terminal 8-1. The level L2 may be, for example, lower or higher than the level L1 by the plate thickness of terminals 8-1 and 8-2.

[0057] As shown in A of FIG. 5, the outer surface of case 4-2 can be overlapped with the outer surface of case 4-1 so that the second unevenness formed in case 4-2 engages with the first unevenness formed in case 4-1. That is, the power storage device 6-1 of the power storage device module 2 and the power storage device 6-2 of another power storage device module 2 can form a staggered arrangement.

[0058] As shown in B of FIG. 5, when the case 4-2 of another power storage device module 2 is overlapped with the case 4-1 of the power storage device module 2 on the outer surface, the terminal 8-2 of another power storage device module 2 overlaps with the terminal 8-1 of the power storage device module 2. Therefore, the terminal 8-2 can be connected to the terminal 8-1 by the fastening hole 58-1 of the terminal 8-1, the fastening hole 58-2 of the terminal 8-2, and the stopper 106 (FIG. 8). Also, when the case 4-1 of another power storage device module 2 is overlapped with the case 4-2 of the power storage device module 2 on the outer surface, the terminal 8-1 of another power storage device module 2 overlaps with the terminal 8-2 of the power storage device module 2, and the terminal 8-1 can be connected to the terminal 8-2.

[0059] The bus bar 10 and the cross bus bar 11 are metal plates such as aluminum plates and copper plates. The bus bar 10 is installed on adjacent first and second terminals, and the cross bus bar 11 is installed on the second terminal of the power storage device 6-1 arranged at the end and the first terminal of the power storage device 6-2 arranged at the end. The cross bus bar 11 may be installed on the first terminal of the power storage device 6-1 arranged at the end and the second terminal of the power storage device 6-2 arranged at the end. The bus bar 10 and the cross bus bar 11 have through holes at positions corresponding to the first and second terminals, and are fixed and connected to the first and second terminals by two stoppers 15. The bus bar 10 connects adjacent power storage devices 6-1 or adjacent power storage devices 6-2, and the cross bus bar 11 connects the power storage device 6-1 and the power storage device 6-2. Therefore, the power storage devices 6-1 and 6-2 are integrated by the bus bar 10 and the cross bus bar 11.

[0060] The balance circuit 12 is arranged, for example, between the mounted bus bars 10 and suppresses voltage fluctuations caused by the series connection of the power storage devices 6.

[0061] The power storage device module 2 can be manufactured, for example, by the following manufacturing procedure. The manufacturing procedure shown below is an example of a method for manufacturing a power storage device module, and the technology of the present disclosure is not limited to such a manufacturing procedure.

[0062] Produce the cases 4-1, 4-2, the power storage device 6, the terminals 8-1, 8-2, the bus bar 10, the cross bus bar 11, and the balance circuit 12. These members may be produced independently or prepared by procurement from the outside.

[0063] The cases 4-1, 4-2 are produced, for example, by resin molding. In resin molding, for example, a thermosetting resin is injected into a molding die and molded into the aforementioned shapes of the cases 4-1, 4-2. The cases 4-1, 4-2 may be produced by a 3D printer.

[0064] In the production of the power storage device 6, an exterior case 54, a power storage element, electrode terminals, a sealing member to which the electrode terminals are attached, etc. are produced. The power storage element and the electrolytic solution are inserted into the interior of the exterior case 54, the electrode terminals are connected to the power storage element, and the sealing member is attached to the opening of the exterior case 54 to obtain the power storage device 6.

[0065] The terminals 8-1, 8-2, the bus bar 10, and the cross bus bar 11 are produced, for example, by sheet metal working. In sheet metal working, the sheet metal is cut or bent into the shapes of the terminals 8-1, 8-2, the bus bar 10, or the cross bus bar 11.

[0066] Install the terminals 8-1, 8-2, the bus bar 10, and the cross bus bar 11 on the power storage device 6, and fix the terminals 8-1, 8-2, the bus bar 10, and the cross bus bar 11 to the power storage device 6 with the fasteners 15. Integrate these members to produce an assembly of the power storage device 6.

[0067] The power storage device 6 is disposed inside the cases 4-1 and 4-2 such that the power storage devices 6-1 and 6-2 are respectively accommodated in the accommodation regions 16-1 and 16-2. The second engaging portion 40-2 of the case 4-2 is engaged with the first engaging portion 40-1 of the case 4-1, and the second engaging portion 40-2 of the case 4-1 is engaged with the first engaging portion 40-1 of the case 4-2 to attach the case 4-2 to the case 4-1. The case 4-2 is fixed to the case 4-1 by attaching the stopper 14 to the first fixing member 50-1 and the second fixing member 50-2, thereby obtaining the power storage device module 2.

[0068] Inside the module case 4, the power storage device 6-1 is disposed between the cover portion 22-1 of the case 4-1 and the partition portions 26-2 and 26-1 of the case 4-2, and the movement of the power storage device 6-1 is restricted. Also, the power storage device 6-2 is disposed between the cover portion 22-2 of the case 4-2 and the partition portions 26-1 and 26-2 of the case 4-1, and the movement of the power storage device 6-2 is restricted. The power storage device 6-1 may be fixed by the cover portion 22-1, the partition portion 26-2, etc., and the power storage device 6-2 may be fixed by the cover portion 22-2, the partition portion 26-1, etc.

[0069] According to the first embodiment, the following operations or effects can be obtained.

[0070] (1) The cover portion 22-1 and the partition portions 26-1 and 26-2 form the accommodation region 16-1 and restrict the movement of the power storage device 6-1, and the cover portion 22-2 and the partition portions 26-1 and 26-2 form the accommodation region 16-2 and restrict the movement of the power storage device 6-2. By attaching the two cases 4-1 and 4-2, the accommodation region of the power storage device is formed and a simple movement suppression structure of the power storage device 6 is formed.

[0071] (2) The number of components of the power storage device module 2 is small, the burden of component preparation, the assembly burden, the inventory management burden, etc. are suppressed, and labor saving is achieved.

[0072] (3) There is no need to install a spacer between the adjacent power storage devices 6-1 and 6-2. Therefore, the gap between the power storage devices 6-1 and 6-2 can be narrowed. The widths of the power storage device module 2 and the module case 4 can be suppressed, and the power storage device module 2 and the module case 4 can be miniaturized.

[0073] (4) Since the number of components is small, the weight of the power storage device 6 can be suppressed.

[0074] (5) When the case 4-2 has the same shape as the case 4-1, it is not necessary to separately manufacture the cases 4-1 and 4-2 by commonizing parts. Therefore, only one type of mold needs to be prepared for manufacturing the cases 4-1 and 4-2, the mold cost can be suppressed, and the management burden of the mold can be suppressed. Also, in manufacturing the cases 4-1 and 4-2, there is no need to switch the manufactured parts, and the manufacturing efficiency of the cases 4-1 and 4-2 can be improved. Furthermore, the management work of the cases 4-1 and 4-2 is reduced.

[0075] (6) Since the cases 4-1 and 4-2 have both the first terminal holes 42 and the second terminal holes 44, the degree of freedom in arranging the terminals 8-1 and 8-2 is high.

[0076] (7) The cover parts 22-1 and 22-2 that contact the power storage device 6 form unevenness on the outer surfaces of the cases 4-1 and 4-2. Therefore, the cases 4-1 and 4-2 have higher heat dissipation than a case with a flat outer surface, a case that contacts the power storage device at points, etc. Also, the power storage devices 6 are arranged in two rows. Since each power storage device 6 contacts the cover part 22-1 or the cover part 22-2, the rise in temperature inside the cases 4-1 and 4-2 is suppressed.

[0077] (8) The second unevenness of Case 4-2 can be engaged with the first unevenness of Case 4-1, and a plurality of power storage device modules 2 can be arranged. The ends of the plurality of arranged power storage device modules 2 are aligned, and the length of the power storage device module 2 is suppressed. The terminal 8-1 of the power storage device module 2 can be connected to the terminal 8-2 of another adjacent power storage device module 2, and the connectivity of the power storage device module 2 is excellent. Second Embodiment

[0078] FIG. 6 shows an example of a power storage device module according to the second embodiment. FIG. 7 is a diagram showing a joined body of power storage devices. The configurations shown in FIGS. 6 and 7 are examples, and the technology of the present disclosure is not limited to such configurations. In FIGS. 6 and 7, the same parts as those in FIGS. 1 to 5 are denoted by the same reference numerals.

[0079] The power storage device module 72 has a power storage function and a discharge function, and is used as a power source for production products such as electrical products, electronic devices, vehicles, and flying objects. The power storage device module 72 includes the aforementioned module case 4, terminals 8-1, 8-2, a plurality of bus bars 10, a cross bus bar 11, a balance circuit 12, stoppers 14, 15, etc., and further includes a holder 74. Descriptions of the module case 4, terminals 8-1, 8-2, a plurality of bus bars 10, a cross bus bar 11, a balance circuit 12, and stoppers 14, 15 are omitted.

[0080] The holder 74 is an example of a bus bar holder for arranging a bus bar, and is a resin member containing, for example, a thermoplastic resin. The holder 74 is installed at the terminal side end of the power storage device 6 (that is, the upper end of the power storage device 6). The holder 74 has through holes at positions corresponding to the electrode terminals of the power storage device 6, and the electrode terminals are inserted through these through holes. For example, the thickness of the holder 74 is adjusted so that the level of the end of the electrode terminal inserted through the through hole is the same as the level of the outer surface of the holder 74. The thickness of the holder 74 may be adjusted so that the electrode terminal inserted through the through hole slightly protrudes from the outer surface of the holder 74. By adjusting the thickness of the holder 74, the terminals 8-1, 8-2, the bus bar 10, and the cross bus bar 11 arranged on the outer surface of the holder 74 can be in direct contact with the electrode terminals, and the stability or placement property of the terminals 8-1, 8-2, the bus bar 10, and the cross bus bar 11 is enhanced.

[0081] The holder 74 may include positioning means on its outer surface. The positioning means is, for example, a step or a protrusion, and is formed so as to surround the terminals 8-1, 8-2, the bus bar 10, and the cross bus bar 11 arranged on the holder 74. Therefore, the positioning means determines the positions of the terminals 8-1, 8-2, the bus bar 10, and the cross bus bar 11, and arranges the through holes of the terminals 8-1, 8-2, the bus bar 10, and the cross bus bar 11 on the first terminal or the second terminal.

[0082] The side surface 76 of the holder 74 has a shape corresponding to, for example, the inner surface of the upper part of the cases 4-1, 4-2. Therefore, the holder 74 accommodated in the module case 4 is fixed to the module case 4, for example.

[0083] The holder 74 may include a first hole filling member 78 and a second hole filling member 80. The first hole filling member 78 and the second hole filling member 80 are formed at the ends of the side surface 76 of the holder 74 extending in the length direction. The first hole filling member 78 has a shape corresponding to the first terminal hole 42, and the second hole filling member 80 has a shape corresponding to the second terminal hole 44. Therefore, the first hole filling member 78 and the second hole filling member 80 are respectively fitted into the first terminal hole 42 and the second terminal hole 44 into which the terminals 8-1 and 8-2 are not inserted and block the first terminal hole 42 and the second terminal hole 44. The first hole filling member 78 and the second hole filling member 80 enhance the confidentiality of the module case 4 and suppress the intrusion of dust and dirt into the module case 4.

[0084] The power storage device module 72 can be manufactured, for example, by the manufacturing procedure of the power storage device module 2 described above and a manufacturing procedure including the additional procedures shown below. The above-described manufacturing procedure and the additional procedures are an example of a method for manufacturing a power storage device module, and the technology of the present disclosure is not limited to such a manufacturing procedure.

[0085] The holder 74 is manufactured. The holder 74 may be manufactured independently or prepared by procurement from the outside. The holder 74 is manufactured, for example, by resin molding. In resin molding, for example, a thermosetting resin is injected into a molding die and molded into the above-described shape of the holder 74. The holder 74 may be manufactured by a 3D printer.

[0086] Before the terminals 8-1, 8-2, the bus bar 10, and the cross bus bar 11 are installed on the power storage device 6, the holder 74 is installed on the power storage device 6. The terminals 8-1, 8-2, the bus bar 10, and the cross bus bar 11 are installed on the power storage device 6 on which the holder 74 is installed. The terminals 8-1, 8-2, the bus bar 10, and the cross bus bar 11 are fixed to the power storage device 6 by the fasteners 15. These members are integrated to produce an assembly of the power storage device 6.

[0087] According to the second embodiment, the following operations or effects can be obtained.

[0088] (1) The same operations and effects as those of the power storage device module 2 of the first embodiment can be obtained.

[0089] (2) When the terminal 8-1, 8-2, the bus bar 10, and the cross bus bar 11 are connected to the power storage device 6 by the holder 74, the stability or placement property of the terminal 8-1, 8-2, the bus bar 10, and the cross bus bar 11 is enhanced.

[0090] (3) The first hole filling member 78 and the second hole filling member 80 are fitted into the first terminal hole 42 and the second terminal hole 44 and block the first terminal hole 42 and the second terminal hole 44. Therefore, the confidentiality of the module case 4 is enhanced. Third Embodiment

[0091] FIG. 8 shows an example of a module connector according to the third embodiment. The configuration shown in FIG. 8 is an example, and the technology of the present disclosure is not limited to such a configuration. In FIG. 8, the same parts as those in FIGS. 1 to 5 are denoted by the same reference numerals.

[0092] The module connector 102 includes a plurality of power storage device modules 2, an installation plate 104, and fasteners 106, 108 such as screws.

[0093] The power storage device module 2 is the power storage device module 2 according to the first embodiment, and the description of the power storage device module 2 is omitted. A plurality of power storage device modules 2 are arranged so that the second unevenness of the case 4-2 engages with the first unevenness of the adjacent case 4-1. The terminal 8-2 overlaps the adjacent terminal 8-1, and the terminals 8-1, 8-2 are connected by the fastener 106.

[0094] The installation plate 104 has a female screw portion. The female screw portion is formed at the installation position of the installation portion 48 of the plurality of power storage device modules 2. The installation portion 48 is overlapped with the female screw portion and fixed to the female screw portion by the fastener 108. The installation plate 104 enhances the rigidity and integrity of the module connector 102.

[0095] The setting plate 104 may have a connecting portion 110. The connecting portion 110 is used for connection with other articles.

[0096] According to the third embodiment, the following operations or effects can be obtained.

[0097] (1) The same operations and effects as those of the power storage device module 2 of the first embodiment can be obtained.

[0098] (2) A plurality of power storage device modules 2 are arranged such that the second unevenness of the case 4-2 engages with the first unevenness of the adjacent case 4-1. Therefore, the width of the module connection body 102 is suppressed.

[0099] The characteristic matters and modification examples of the embodiment are listed below.

[0100] (1) In the above embodiment, the case 4-2 has the same shape as the case 4-1. However, the case 4-2 may have a shape different from that of the case 4-1.

[0101] (2) In the above embodiment, the cover portions 22-1 and 22-2 are curved portions having a curved concave surface on the inner surface. However, the cover portions 22-1 and 22-2 may be bent portions having a bent concave surface on the inner surface. That is, the cover portions 22-1 and 22-2 may be bent portions such as curved portions and bent portions. The bent concave surface is a concave surface having an angle formed by bending, and has, for example, a surface shape that matches the surface shape of a polygonal prism.

[0102] (3) In the above embodiment, the power storage device 6 has a cylindrical shape. However, the shape of the power storage device 6 is not limited to a cylindrical shape. When the side surface of the power storage device 6 has a flat surface, the inner surfaces of the cover portions 22-1 and 22-2 may be flat. When the power storage device 6 having a quadrangular prism shape is accommodated in the module case 4 such that the diagonal line thereof is parallel to the width direction of the module case 4, the inner surfaces of the cover portions 22-1 and 22-2 may have triangular depressions.

[0103] (4) In the above embodiment, the stopper 15 is, for example, a screw. However, the stopper 15 may be a weld. That is, the bus bar 10 or the like may be connected to the electrode terminal by welding.

[0104] (5) In the above embodiment, the power storage device 6-2 is connected in series to the power storage device 6-1. However, the connection of the power storage devices 6-1 and 6-2 is not limited to a series connection. For example, the power storage device module 2 may include other terminals 8-1 and 8-2 instead of the cross bus bar 11. The terminal 8-1 connected to the power storage device 6-1 and the other terminal 8-2 may protrude from the case 4-1, and the other terminal 8-1 and the terminal 8-2 connected to the power storage device 6-2 may protrude from the case 4-2. Further, the power storage device 6-2 may be connected to the power storage device 6-1 at both ends by two cross bus bars 11, and the power storage device 6-2 may be connected in parallel to the power storage device 6-1.

[0105] (6) In the above third embodiment, a plurality of power storage device modules 2 are connected in series. However, the connection of the plurality of power storage device modules 2 is not limited to a series connection.

[0106] (7) The power storage devices 6 are arranged in two rows, but may be arranged in three or more rows.

[0107] (8) In the above-described third embodiment, a plurality of power storage device modules 2 are arranged. However, the case 4-1 of the power storage device module 2 and the case 4-2 of another power storage device module 2 adjacent to this case 4-1 may be integrated. When an integrated case is used, the burden of combining the power storage device module 2 with another power storage device module 2 is reduced. Further, by reducing the thickness of the central portion of the integrated case, the width of the module connector 102 can be suppressed.

[0108] (9) The module connector 102 may include a plurality of power storage device modules 72 instead of the power storage device module 2, or may include both the power storage device module 2 and the power storage device module 72.

[0109] (10) In the above embodiment, for example, the power storage device 6-1 contacts the cover portion 22-1 formed by resin molding, and the power storage device 6-2 contacts the cover portion 22-2 formed by resin molding. However, the cover portions 22-1 and 22-2 may include other members on their inner surfaces. That is, the power storage device 6-1 may contact another member that is a part of the cover portion 22-1, and the power storage device 6-2 may contact another member that is a part of the cover portion 22-2. The other member is, for example, a member having excellent heat dissipation properties, and the heat dissipation properties of the cases 4-1 and 4-2 are enhanced by the other member.

[0110] (11) In the above embodiment, the partition portion 26-1 is connected to the joint portion 24-1, and the partition portion 26-2 is connected to the joint portion 24-2. However, the partition portions 26-1 and 26-2 may be separated from the joint portions 24-1 and 24-2. That is, the case 4-1 may include the tip portion of the partition portion 26-1, and this tip portion may be supported by the cover portion 22-1 via the power storage device 6-1 and adjacent to the accommodation region 16-2. The case 4-2 may include the tip portion of the partition portion 26-2, and this tip portion may be supported by the cover portion 22-2 via the power storage device 6-2 and adjacent to the accommodation region 16-1.

[0111] (12) The holder 74 may be separable. The holder 74 is divided, for example, into a central block, a first terminal block, and a second terminal block. The central block is a block that is line-symmetric in the length direction and the width direction, and is disposed between the terminal blocks. The first terminal block can be connected to the end of the central block and is used for the arrangement of the terminals 8-1 and 8-2. The second terminal block can be connected to the end of the central block and is used for the arrangement of the cross bus bar 11. And the first terminal block and the second terminal block are mutually recombinable. According to the separable holder 74, an appropriate holder 74 can be obtained by changing the terminal block according to the arrangement of the terminals 8-1, 8-2, and the cross bus bar 11.

[0112] (13) In the above embodiment, the module case 4 is divided in the width direction. However, the module case 4 may be divided in the height direction. That is, the module case 4 may include two cases obtained by dividing the combined cases 4-1 and 4-2 in the height direction. By combining these two cases, an accommodation region 16 can be formed inside the module case 4. The movement of the power storage device 6-1 can be restricted by the cover portion 22-1, the partition portion 26-2, etc., and the movement of the power storage device 6-2 can be restricted by the cover portion 22-2, the partition portion 26-1, etc.

[0113] As described above, the most preferred embodiments of the present disclosure have been described. However, the present disclosure is not limited to the above description, and various modifications and changes can be made by those skilled in the art based on the gist of the invention described in the claims or disclosed in the specification. Needless to say, such modifications and changes are included in the scope of the present disclosure.

Industrial Applicability

[0114] The technology of the present disclosure is useful, for example, as an industrial power source or a power storage device.

Explanation of Reference Numerals

[0115] 2. 72 Battery device module 4 Module case 4-1, 4-2 Case 6, 6-1, 6-2 Battery device 8-1, 8-2 Terminals 10 Bus bar 11 Cross bus bar 12 Balance circuit 14, 15, 106, 108 Fasteners 16, 16-1, 16-2 Accommodation areas 22-1, 22-2 Cover parts 24-1, 24-2 Joint parts 26-1, 26-2 Partition parts 28 Base 30 Rib 32 Upper frame 34 Lower frame 36, 38 Side frames 40-1 First engaging part 40-2 Second engaging part 42 First terminal hole 44 Second terminal hole 46 Legs 48 Installation part 50-1 First fixing member 50-2 Second fixing member 52 Frame plate 54 Exterior case 56 Crank 58-1, 58-2 Fastening holes 74 Holder 76 Side surface 78 First hole filling member 80 Second hole filling member 102 Module connector 104 Installation plate 110 Connection part

Claims

1. A plurality of power storage devices including a first power storage device and a second power storage device; A first case including a plurality of first cover portions and a first partition portion formed between the first cover portions and partitioning a first accommodation region for accommodating the first power storage device; A second case including a plurality of second cover portions and a second partition portion formed between the second cover portions and partitioning a second accommodation region for accommodating the second power storage device, the second case being coupled to the first case; Comprising: The first accommodation region is formed by the first cover portion, the first partition portion, and the second partition portion; A power storage device module in which the second accommodation region is formed by the second cover portion, the second partition portion, and the first partition portion.

2. The power storage device module according to claim 1, wherein movement of the first power storage device is restricted by the first cover portion, the first partition portion, and the second partition portion, and movement of the second power storage device is restricted by the second cover portion, the second partition portion, and the first partition portion.

3. The power storage device module according to claim 1 or claim 2, wherein the first accommodation region and the second accommodation region form a staggered arrangement.

4. The power storage device module according to claim 1 or claim 2, wherein the plurality of power storage devices include a plurality of the first power storage devices arranged in a first row and a plurality of the second power storage devices arranged in a second row parallel to the first row, and the first power storage devices and the second power storage devices form a staggered arrangement.

5. The distance from the outer end of the first case to the tip of the first partition portion is smaller than the distance obtained by the sum of the diameter of the power storage device having a cylindrical shape and the thickness of the first cover portion, or The distance from the outer end of the second case to the tip of the second partition portion is smaller than the distance obtained by the sum of the diameter of the power storage device and the thickness of the second cover portion. The power storage device module according to claim 1 or claim 2.

6. When the power storage device has a cylindrical shape, the radius of the power storage device is r, and the gap between adjacent first power storage devices is 2α, the accommodation width AW of the power storage device has a value represented by the following formula: 2r + [(2r) 2 -(r + α) 2 1 / 2 <AW<2r + √3×(r + α)​ The power storage device module according to claim 4.

7. The power storage device module according to claim 1 or claim 2, wherein the second case has the same shape as the first case.

8. The first partition portion is connected to a first joint portion between the adjacent first cover portions, The second partition portion is connected to a second joint portion between the adjacent second cover portions, The power storage device module according to claim 1 or claim 2.

9. On the outer surface of the first case, first unevenness is formed by the first cover portion, On the outer surface of the second case, second unevenness is formed by the second cover portion, The second unevenness can be engaged with the first unevenness The power storage device module according to claim 1 or claim 2.

10. A first terminal connected to the first power storage device and protruding outward through the first case, and A second terminal connected to the second power storage device and protruding outward through the second case, and Further comprising, The first terminal can be connected to another second terminal of another power storage device module installed on the outer surface of the first case, The second terminal can be connected to another first terminal of another power storage device module installed on the outer surface of the second case, The power storage device module according to claim 1 or claim 2.

11. The power storage device module according to claim 1 or claim 2, further comprising a bus bar holder on which a bus bar for connecting electrode terminals of the plurality of power storage devices is arranged and which is installed on the plurality of power storage devices.

12. Comprising the power storage device module according to claim 10 and at least one of the other power storage device modules, A module connector in which the first terminal is connected to the other second terminal of the other power storage device module, or the second terminal is connected to the other first terminal of the other power storage device module.

13. A step of manufacturing or preparing a plurality of power storage devices including a first power storage device and a second power storage device; A step of manufacturing or preparing a first case including a plurality of first cover portions and a first partition portion formed between the first cover portions and partitioning a first accommodation region for accommodating the first power storage device; A step of manufacturing or preparing a second case including a plurality of second cover portions and a second partition portion formed between the second cover portions and partitioning a second accommodation region for accommodating the second power storage device; A step of attaching the second case to the first case such that the first power storage device and the second power storage device are respectively accommodated in the first accommodation region and the second accommodation region; comprising; A method for manufacturing a power storage device module, wherein the first accommodation region is formed by the first cover portion, the first partition portion, and the second partition portion, and the second accommodation region is formed by the second cover portion, the second partition portion, and the first partition portion.

14. A first case including a plurality of first cover portions and a first partition portion formed between the first cover portions and partitioning a first accommodation region for accommodating a first power storage device; A second case including a plurality of second cover portions and a second partition portion formed between the second cover portions and partitioning a second accommodation region for accommodating a second power storage device, the second case being coupled to the first case; comprising; The first accommodation region is formed by the first cover portion, the first partition portion, and the second partition portion; The second accommodation region is formed by the second cover portion, the second partition portion, and the first partition portion; A module case.

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