Portable power supply device

Abstract

A portable power supply device (91) is provided with: a secondary battery (81); and a case (1) which is configured so as to include a box-shaped lower case (1C) which accommodates and supports the secondary battery (81) and which has an open upper surface, and a cover case (1A) which is provided so as to cover the upper surface of the lower case (1C), and which is configured so as to have handle sections (11) on the opposite edge sections of the upper edge section, respectively, and which can be transported by hand. The handle portion (11) has a metal base portion (71) as a core material, and the cover housing (1A), the lower housing (1C), and the base portion (71) of the handle portion (11) are clamped by screwing of a male screw bolt (51) and a female screw bolt (61) which are inserted through the housing (1) in the vertical direction.

Description

Technical Field

[0001] The present disclosure relates to a portable power supply device. Background Art

[0002] Patent document 1 discloses a portable power supply device (hereinafter referred to as a portable power supply device), which has a front panel and a rear panel that are parallel to each other, a middle chassis that connects them at the center, and a pair of side covers that are divided into left and right. The front panel, the rear panel, and the pair of side covers of the portable power supply device are assembled in a manner that sandwiches the middle chassis to form a box-shaped housing. The front panel, the rear panel, and the pair of side covers are formed of resin. The portable power supply device described in patent document 1 has a handle formed by fitting a pair of side covers from left to right on the upper part of the housing. In addition, the portable power supply device uses a commercial power supply.

[0003] Patent Document 2 describes a method for manufacturing a housing, which includes applying an adhesive on a metal plate, and after the adhesive is dried, injecting a resin on the adhesive layer to manufacture the housing. According to the method for manufacturing the housing, a housing with high strength can be obtained in an electronic device.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Laid-Open No. 8-140349

[0007] Patent Document 2: Japanese Patent Application Laid-Open No. 7-124995 Summary of the invention

[0008] In recent years, portable power supply devices equipped with secondary batteries with large battery capacity have been produced. As the battery capacity increases, the size and mass of the secondary battery increase.

[0009] When a secondary battery is mounted in the existing housing structure described in Patent Document 1 using a commercial power source, the housing needs to be made stronger as the mounted secondary battery becomes larger and heavier. This is because, in the existing housing structure, if the upper handle is held and the housing is repeatedly carried, the housing is made of resin and a pair of side covers are provided on the left and right. Therefore, if the resin cannot maintain sufficient strength due to time degradation, the housing is deformed and the secondary battery may not be firmly held.

[0010] However, when the technique described in Patent Document 2 is introduced in order to maintain the housing at high strength, there is a possibility that the number of manufacturing steps will increase, which may lead to an increase in cost.

[0011] Therefore, a problem to be solved by the present disclosure is to provide a portable power source device capable of firmly holding a secondary battery with an inexpensive housing structure.

[0012] The portable power source device according to the embodiment includes: a secondary battery; and a housing, which is configured to include a box-shaped lower housing that accommodates and supports the secondary battery and is open on the top, and a cover housing that is arranged to cover the upper part of the lower housing, and has handles at the opposite edge portions of the upper edge portion, respectively, so that it can be carried by hand. The handle portion has a metal base as a core material. The cover housing, the lower housing, and the base of the handle portion are clamped by screwing an externally threaded bolt and an internally threaded bolt that are inserted through the housing in the up-down direction.

[0013] According to the portable power source device having the above structure, it is possible to obtain an effect of being able to firmly support the secondary battery with an inexpensive housing structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1A This is a first perspective view of a power supply device 91 as a portable power supply device according to the embodiment, as seen from diagonally above right.

[0015] Figure 1B This is a second perspective view of the power supply device 91 as viewed diagonally from the lower right side.

[0016] Figure 2 1 is a top view of the power supply device 91.

[0017] Figure 3A This is a first assembly diagram of the power supply device 91 as viewed from the upper right diagonally.

[0018] Figure 3B This is a second assembly diagram of the power supply device 91 as viewed diagonally from the lower right side.

[0019] Figure 4A It is a plan view showing the base 71 of the handle unit 7 .

[0020] Figure 4B It is a side view which takes a part of the base 71 as a cross section.

[0021] Figure 4C It is a top view of the handle unit 7.

[0022] Figure 4D Yes Figure 4C Side view of the cross section at the IVD-IVD position.

[0023] Figure 5A yes Figure 2 Cross-sectional view at the VA-VA position in the middle.

[0024] Figure 5B yes Figure 2 Cross-sectional view at the VB-VB position. DETAILED DESCRIPTION

[0025] The portable power source device according to the embodiment will be described by referring to a power source device 91 of the example.

[0026] First, refer to Figure 1A , Figure 1B and Figure 2 The external appearance of the power supply device 91 will be described. Figure 1A This is a first perspective view of a power supply device 91 as a portable power supply device according to the embodiment, as seen from diagonally above right. Figure 1B This is a second perspective view of the power supply device 91 as viewed diagonally from the lower right side. Figure 2 91 is a top view of the power supply device 91. For the sake of convenience, the front, back, left, right, up and down directions are defined as Figure 1A Direction indicated by the arrow.

[0027] The power supply device 91 is a portable power supply device that uses a secondary battery such as a lithium ion secondary battery as a power source and can be carried by hand.

[0028] like Figure 1A As shown, the power supply device 91 has a box shape in appearance based on the housing 1. The housing 1 is configured to form a box shape by combining a cover housing 1A, an upper housing 1B, and a lower housing 1C.

[0029] In the housing 1, the lower side of the boundary at a position of approximately half of the total height is the lower housing 1C, and the upper side is the upper housing 1B, and the cover housing 1A is assembled to cover the upper part of the upper housing 1B. A top plate 2 having a pair of cutouts 2a and formed in a substantially H shape is mounted on the cover housing 1A.

[0030] The operation unit 12 is provided on the front portion 1Ba of the upper housing 1B. The operation unit 12 includes a display unit 121, a first power output unit 122, and a second power output unit 123. The display unit 121 displays the operation state of the power supply device 91, etc. The first power output unit 122 and the second power output unit 123 each have, for example, a plurality of USB terminals and a two-pole socket. In addition, a two-pole socket is illustrated as the second power output unit 123 in the figure, but the shape and number of poles of the socket are not limited.

[0031] Handle portions 11 are provided at opposite edge portions of the upper edge portion of the housing 1. The handle portion 11 has an upper opening portion 112 formed on the upper surface and extending in the front-to-back direction, and side opening portions 113 formed on the upper side portions of the left face portion 1Bb and the right face portion 1Bc and extending in the front-to-back direction. The upper opening portion 112 and the side opening portion 113 are connected inside the housing 1. The fingers FG other than the thumb can be inserted through the side opening portion 113 to lift the power supply device 91.

[0032] A pair of legs 3 extending in the left-right direction are attached to the bottom surface 1Ce of the lower case 1C at a distance in the front-rear direction.

[0033] The cover case 1A, the upper case 1B and the lower case 1C are formed of resin. An example of the resin is a polymer alloy of polycarbonate resin and ABS resin. The top plate 2 and the leg portion 3 are formed of rubber or elastomer resin.

[0034] Next, refer to FIG. 3A to FIG. 5B The structure of the power supply device 91 will be described. Figure 3A This is a first assembly diagram of the power supply device 91 as viewed from the upper right diagonally. Figure 3B This is a second assembly diagram of the power supply device 91 as viewed diagonally from the lower right side. Figure 4A It is a plan view showing the base 71 which is the core material of the handle unit 7 . Figure 4B It is a side view which takes a part of the base 71 as a cross section. Figure 4C It is a top view of the handle unit 7. Figure 4D Yes Figure 4C Side view of the cross section at the IVD-IVD position. Figure 5A yes Figure 2 Cross-sectional view at the VA-VA position in the middle. Figure 5B yes Figure 2 Cross-sectional view at the VB-VB position.

[0035] like Figure 3A As shown, the lower housing 1C includes a bottom portion 1Ce, a front portion 1Ca, a left portion 1Cb, a right portion 1Cc, and a rear portion 1Cd. The bottom portion 1Ce is rectangular in a plan view. The bottom portion 1Ce has a front portion 1Ca, a left portion 1Cb, a right portion 1Cc, and a rear portion 1Cd that are erected upward from four edge portions on the upper side. Thus, the lower housing 1C is formed into a box shape that is open upward.

[0036] Bosses 1C1 to 1C4 are formed near four corners of the bottom surface 1Ce at positions symmetrical in front and back and left and right. The bosses 1C1 to 1C4 have through holes penetrating in the up-down direction.

[0037] The vertically extending axes CL1 to CL4 of the bosses 1C1 to 1C4 are located at the vertices of a rectangle in plan view, and a secondary battery 81 is fixed inside the rectangle. The secondary battery 81 is in a rectangular parallelepiped shape and is fixed to the bottom surface 1Ce by a fixing member (not shown).

[0038] In this example, the corners of the secondary battery 81 when viewed from above are located near the bosses 1C1 to 1C4. The example in which the height position of the upper surface of the secondary battery 81 is located above the upper end of the lower case 1C is shown. However, the height position of the upper surface of the secondary battery 81 may also be located below the upper end of the lower case 1C.

[0039] In this way, a part or the whole of the secondary battery 81 is accommodated in the box-shaped lower case 1C and fixed to the bottom surface portion 1Ce.

[0040] The upper case 1B is formed into a rectangular frame-like body having a shape corresponding to the upper end of the lower case 1C by connecting the front face portion 1Ba, the left face portion 1Bb, the rear face portion 1Bd, and the right face portion 1Bc.

[0041] Bosses 1B1 to 1B4 having through holes are provided near the four corners of the upper housing 1B. The through holes have axes CL1 to CL4 as axes. Figure 3A As shown, the bosses 1B1 to 1B4 are respectively connected to two adjacent faces of the front face 1Ba, the left face 1Bb, the rear face 1Bd and the right face 1Bc through connecting ribs 1B1a to 1B4a extending in the up-down direction at the four corners inside the upper shell 1B.

[0042] like Figure 3B As shown, a recess 1Ce1 is formed on the lower surface of the bottom portion 1Ce of the lower housing 1C, and the recess 1Ce1 is formed by hollowing out a portion corresponding to the leg 3. The depth of the recess 1Ce1 is about half the thickness of the leg 3. The leg 3 mounted in the recess 1Ce1 protrudes downward from the lower surface of the bottom portion 1Ce.

[0043] The circuit unit 82 is provided inside the upper housing 1B. The circuit unit 82 is supported by the upper housing 1B through a support member (not shown). The circuit unit 82 controls the action of supplying the power stored in the secondary battery 81 to the external device connected to the first power output unit 122 and the second power output unit 123. The circuit unit 82 also controls the action of charging the secondary battery 81 using an external power source.

[0044] like Figure 2 and Figure 3A As shown, the cover housing 1A is formed into a rectangular flat plate. The cover housing 1A has a top surface 1A1 and a front edge portion 1Aa, a left edge portion 1Ab, a right edge portion 1Ac, and a rear edge portion 1Ad as the edge portion of the top surface 1A1. The cover housing 1A is a cover member that is joined to the upper end of the upper housing 1B to close the upper opening.

[0045] The top surface 1A1 has an H-shaped recessed portion 1A2 standing upright in the left-right direction. That is, the recessed portion 1A2 is formed in an H-shape in which the width of the left-right direction of the central portion in the front-back direction is shorter than that of the two ends in the front-back direction when viewed from above. A pair of openings 1A3 are formed in the H-shaped cutout portion where the width of the left-right direction of the recessed portion 1A2 is shortened.

[0046] The recessed portion 1A2 of the top surface portion 1A1 is formed so that the top plate 2 can be mounted on the recessed portion 1A2. The top plate 2 having a substantially H shape is mounted on the H-shaped recessed portion 1A2 in a state where a pair of cutout portions 2a are located in the left-right direction. The recessed portion 1A2 has a portion where the pair of cutout portions 2a of the top plate 2 are each exposed to the upper surface of the housing 1 when the top plate 2 is mounted. A pair of opening portions 1A3 are formed in this portion of the recessed portion 1A2. In addition, in the present embodiment, the pair of opening portions 1A3 are the upper opening portions 112 of the handle portion 11.

[0047] like Figure 3A As shown, step portions 1A4 are formed near the four corners of the cover housing 1A. The step portions 1A4 are located in the recessed portion 1A2 and are formed to be further recessed from the recessed portion 1A2. A through hole 1A4a is formed in each step portion 1A4 with the axis CL1 to CL4 located at the corresponding corner as the axis. As an example, Figure 5A , Figure 5B In FIG. 1 , through holes 1A4a with axes CL1 and CL2 as axes are shown respectively. Figure 2 As shown, the distance L14 between the axis lines CL1 and CL4 in the front-rear direction is the same as the distance L23 between the axis lines CL2 and CL3 in the front-rear direction.

[0048] like Figure 3A As shown, a handle unit 7 is provided between a pair of step portions 1A4 on the left edge side of the cover shell 1A and the bosses 1B1 and 1B4 of the upper shell 1B. Similarly, a handle unit 7 is also provided between a pair of step portions 1A4 on the right edge side of the cover shell 1A and the bosses 1B2 and 1B3 of the upper shell 1B.

[0049] like Figure 4C and Figure 4D As shown, the base portion 71 and the grip portion 72 of the handle unit 7 are formed as one body.

[0050] like Figure 4A As shown, the base 71 is in the shape of a quadrangular prism, and shaft insertion portions 711 are formed near both ends. The base 71 is formed by die casting or cutting of metal.

[0051] like Figure 4A , Figure 4B As shown in FIG. 1 , the shaft insertion portion 711 has seat portions 71a and 71c that are respectively hollowed out into a circular (cylindrical) shape from a pair of opposite surfaces of the base portion 71. Furthermore, a through hole 71b having an inner diameter smaller than that of the seat portions 71a and 71c is formed at the bottom of the shaft insertion portion 711 between the seat portions 71a and 71c. The distance L7 between the axis lines of the pair of shaft insertion portions 711 and Figure 2 The above-mentioned distances L14, L23 are shown to be the same.

[0052] like Figure 4D As shown, the gripping portion 72 has an upper surface 72a, a side surface 72b and a lower surface 72c as the outer shape when viewed from the side. Figure 4D The side surface 72b is connected to one end of the upper surface 72a when viewed from the side, and is at a right angle to the upper surface 72a. The lower surface 72c is connected to the lower end of the side surface 72b via a curved surface, and is connected to the other end of the upper surface 72a by bending upward in an arc shape via a region parallel to the upper surface 72a. As shown in the outer shape when viewed from the side, a step portion 72d is formed in an L-shaped shape at the connection portion between the lower surface 72c and the upper surface 72a.

[0053] The base portion 71 is formed of metal, and the grip portion 72 is formed of an elastic body.

[0054] like Figure 5A As shown, on the axis CL1, the upper bolt 61 is inserted from above into the through hole 1A4a of the step portion 1A4 of the cover housing 1A, the through hole 71b of the shaft insertion portion 711 of the handle unit 7, and the through hole of the boss 1B1 of the upper housing 1B.

[0055] The upper bolt 61 is a metal internal thread bolt with a hexagonal hole, and has a head 61a and a main body 61b. At the front end of the main body 61b, an internal thread portion 611 is formed as an internal thread with a common axis with the main body 61b. The front end of the main body 61b is located near the boundary between the upper shell 1B and the lower shell 1C.

[0056] On the other hand, a step portion 1C5 is formed in the recess 1Ce1 of the lower case 1C. The step portion 1C5 is a circular (cylindrical) recess centered on the axis CL1. The through hole of the boss 1C1 opens in the step portion 1C5 of the recess 1Ce1.

[0057] The lower bolt 51 is inserted upward from the lower side into the through hole of the boss 1C1 of the step portion 1C5 of the lower case 1C.

[0058] The lower bolt 51 is a metal stepped bolt with a hexagonal hole, and has a head 51a and a main body 51b. An external threaded portion 511 is formed at the front end of the main body 61b, and the external threaded portion 511 protrudes with an outer diameter smaller than that of the main body 61b. The external threaded portion 511 is screwed into the internal threaded portion 611 of the upper bolt 61.

[0059] like Figure 5B As shown, on the axis CL2, the upper bolt 62 is inserted from the upper side into the through hole 1A4a of the step portion 1A4 of the cover housing 1A, the through hole 71b of the shaft insertion portion 711 of the handle unit 7, and the through hole of the boss 1B2 of the upper housing 1B.

[0060] In addition, similar to the upper bolt 61 , the upper bolt 62 includes a body portion 62 b formed with an internal thread portion 621 and a head portion 62 a .

[0061] Furthermore, a step portion 1C5 is formed in the recess 1Ce1 of the lower case 1C. The step portion 1C5 is a circular (cylindrical) recess centered on the axis CL2. The through hole of the boss 1C2 opens in the step portion 1C5 of the recess 1Ce1.

[0062] The lower bolt 52 is inserted upward from the lower side into the through hole of the boss 1C2 of the step portion 1C5 of the lower case 1C.

[0063] The lower bolt 52 has a main body 52 b and a head 52 a formed with an external thread 521 , similarly to the lower bolt 51 . The external thread 521 is threadedly engaged with the internal thread 621 of the upper bolt 62 .

[0064] like Figure 5A and Figure 5B As shown, on the same axes CL1 and CL2, the upper bolts 61 and 62 and the lower bolts 51 and 52 are fastened so that their stepped portions come into close contact with each other by screwing the external thread portions 511 and 521 into the internal thread portions 611 and 621. Similarly, on the same axes CL3 and CL4, the upper bolts 63 and 64 and the lower bolts 53 and 54 are fastened so that their stepped portions come into close contact with each other by screwing the external thread portions into the internal thread portions.

[0065] In this state, the upper surfaces of the heads 61a and 62a of the upper bolts 61 and 62 are flush with the recessed portion 1A2 of the cover housing 1A. Furthermore, the lower surfaces of the heads 51a and 52a of the lower bolts 51 and 52 are flush with the recessed portion 1Ce1 of the lower housing 1C. Similarly, the upper surfaces of the heads of the upper bolts 63 and 64 are flush with the recessed portion 1A2 of the cover housing 1A. Furthermore, the lower surfaces of the heads of the lower bolts 53 and 54 are flush with the recessed portion 1Ce1 of the lower housing 1C.

[0066] Therefore, the top plate 2 can be installed closely with the recess 1A2 of the cover housing 1A. In addition, the foot 3 can be installed closely with the recess 1Ce1 of the lower housing 1C. The upper bolt 61 and the lower bolt 51 are shielded by the top plate 2 and the foot 3, thereby improving the appearance quality of the power supply device 91.

[0067] As described above, the upper bolts 61 to 64 and the lower bolts 51 to 54 are fastened on the axes CL1 to CL4 at the four corners of the housing 1. Thus, the cover housing 1A, the upper housing 1B, the lower housing 1C, and the handle unit 7 are firmly integrated by being sandwiched between the heads 61a of the upper bolts 61 to 64 and the heads 51a of the lower bolts 51 to 54 made of metal.

[0068] Therefore, the power supply device 91 can be easily carried by inserting fingers FG other than thumbs of left and right arms into the left and right openings 113 of the handle portion 11 of the power supply device 91 and lifting the power supply device 91 .

[0069] When the power supply device 91 is lifted off the installation surface (the ground, etc.), force generated by gravity applied to the secondary battery 81 is applied to the bottom surface portion 1Ce of the lower case 1C.

[0070] Since the lower case 1C is integrally formed in a box shape, the rigidity of the lower case 1C can be relatively high. Therefore, even when the secondary battery has a large battery capacity and a large mass, the deformation of the lower case 1C can be suppressed to a negligible degree.

[0071] The force generated by the gravity applied to the entire lower housing 1C that accommodates and supports the secondary battery 81 is applied downward to the heads 51a of the four lower bolts 51. The lower bolts 51 to 54 are screwed together with the upper bolts 61 to 64, respectively, and are substantially a metal integral body. Therefore, the force generated by the gravity of the entire lower housing 1C including the secondary battery 81 is a downward force applied to the step portion 1A4 of the cover housing 1A through the heads 61a of the upper bolts 61 to 64. This force is transmitted to the metal base 71 of the handle unit 7 through the step portion 1A4 of the cover housing 1A.

[0072] That is, Figure 5A and Figure 5B As shown, when the handle unit 7 is lifted by the finger FG, the power supply device 91 substantially supports the entire mass including the large mass of the secondary battery 81 with metal parts.

[0073] As described above, the relevant parts for supporting the power supply device 91 are bolts and rod-shaped metal parts that are substantially easy and relatively cheap to obtain. Moreover, these metal parts have strength and rigidity sufficient to support the mass of the secondary battery. In addition, although the step portion 1A4 of the cover housing 1A and the like are sandwiched in a part, since the force applied to the resin of the sandwiched part is a compressive force, a corresponding strength can be obtained.

[0074] Furthermore, the lower case 1C that accommodates and directly supports the secondary battery 81 is made of resin but is formed in a box shape and thus has high rigidity.

[0075] In this way, the power supply device 91 as a portable power supply device can firmly support the secondary battery 81 with an inexpensive housing structure.

[0076] The embodiment described in detail above is not limited to this structure, and modifications may be made without departing from the spirit of the present invention.

[0077] The lower bolts 51 to 54 and the upper bolts 61 to 64 are described as metal internal thread bolts. However, as long as the strength is sufficient to support the mass of the secondary battery, the material is not limited to metal. For example, it may be made of resin or ceramic.

[0078] The example in which the lower bolts 51 to 54 are stepped bolts (e.g., first bolts) having external thread portions 511 and the upper bolts 61 to 64 are internally threaded bolts (second bolts) having internal thread portions 611 is described. However, the lower bolts 51 to 54 of the first bolts may be internally threaded bolts, and the upper bolts 61 to 64 of the second bolts may be stepped bolts.

[0079] The example in which the step portion 1A4 of the cover case 1A is interposed between the base 71 of the handle unit 7 and the head 61a of the upper bolt 61 has been described. However, the base 71 and the head 61a may be directly in contact with each other.

[0080] In addition, a metal flat washer or a spring washer may be interposed between the head 51 a of the lower bolt 51 and the lower case 1C.

[0081] The housing 1 may be configured without the upper housing 1B, with the cover housing 1A covering the upper side of the lower housing 1C, and the cover housing 1A and the lower housing 1C being clamped by screwing the first bolt and the second bolt.

[0082] The entire contents of Japanese Tokugan Application No. 2022-132348 (filing date: August 23, 2022) are incorporated herein by reference.

[0083] Several embodiments of the present invention are described above, but these embodiments are presented as examples and are not intended to limit the scope of the invention. These new embodiments can be implemented in various other ways, and various omissions, substitutions, and changes can be made without departing from the scope of the subject matter of the invention. These embodiments or their modifications are included in the scope or subject matter of the invention, and are included in the invention described in the claims and their equivalents.

Claims

1. A portable power supply device, comprising: Secondary batteries; as well as The housing is composed of a box-shaped lower housing which accommodates and supports the secondary battery and has an open top, and a cover housing which is arranged to cover the upper part of the lower housing, and has handles at the opposite edges of the upper edge, respectively, so that the battery can be carried by hand. The handle portion has a metal base as a core material, The cover housing, the lower housing, and the base of the handle portion are clamped by screwing together an externally threaded bolt and an internally threaded bolt that are inserted through the housing in the up-down direction.

2. The portable power supply device according to claim 1, wherein: When one of the externally threaded bolt and the internally threaded bolt is used as a first bolt and the other is used as a second bolt, the first bolt is inserted into the lower housing from the bottom side, and the second bolt is inserted into the cover housing from the top side and screwed into the first bolt. In a state where the handle portion is gripped and lifted, a force generated by the gravity of the secondary battery is transmitted to the base portion of the handle portion via the first bolt and the second bolt.

3. The portable power supply device according to claim 1, wherein: The housing includes a frame-shaped upper housing between the lower housing and the cover housing.

4. The portable power supply device according to claim 3, wherein: The top surface portion of the cover housing includes: a recessed portion formed to be able to mount a top plate; and Four step portions are formed near four corners of the top surface of the cover shell so as to be further recessed in the recess. When one of the externally threaded bolt and the internally threaded bolt is used as the first bolt and the other is used as the second bolt, the upper shell includes bosses near the four corners of the upper shell, each of which has a through hole penetrating in the up-down direction, and the second bolt is inserted through the boss from the upper side. The lower housing includes bosses near four corners of the bottom surface of the lower housing, respectively. The bosses have through holes penetrating in the up-down direction. The first bolt is inserted through the bosses from the bottom side. The handle portion is arranged between a pair of the step portions at one of the left and right edges of the cover shell and each boss of a pair of the bosses at the one edge of the upper shell, and other handle portions are also arranged between a pair of the step portions at the other of the left and right edges of the cover shell and each boss of a pair of the bosses at the other edge of the upper shell.

5. The portable power supply device according to claim 4, wherein: Each of the bosses included in the upper shell is connected to two adjacent faces among the front face, left face, rear face and right face of the upper shell through connecting ribs extending in the up-down direction at four corners inside the upper shell.

6. The portable power supply device according to claim 2, wherein: The housing includes a frame-shaped upper housing between the lower housing and the cover housing.

7. The portable power supply device according to claim 6, wherein: The cover housing includes a top surface portion thereof: a recessed portion formed to be able to mount a top plate; and Four step portions are formed near four corners of the top surface of the cover shell so as to be further recessed in the recess. The upper shell includes bosses near four corners of the upper shell, each boss having a through hole penetrating in the up-down direction, and the second bolt is inserted through the boss from the upper side. The lower housing includes bosses near four corners of the bottom surface of the lower housing, respectively. The bosses have through holes penetrating in the up-down direction. The first bolt is inserted through the bosses from the bottom side. The handle portion is arranged between a pair of the step portions at one of the left and right edges of the cover shell and each boss of a pair of the bosses at the one edge of the upper shell, and other handle portions are also arranged between a pair of the step portions at the other of the left and right edges of the cover shell and each boss of a pair of the bosses at the other edge of the upper shell.

8. The portable power supply device according to claim 7, wherein: Each of the bosses included in the upper shell is connected to two adjacent faces among the front face, left face, rear face and right face of the upper shell through connecting ribs extending in the up-down direction at four corners inside the upper shell.

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