JPWO2019064722A1 - Power supply - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the strength and rigidity of a power supply device. SOLUTION: A power supply device 100 has a band portion 51 having an L-shaped horizontal cross section and a band portion 51 covering four sides of a top surface 41 and a bottom surface 42 of a battery assembly 40 connecting the corresponding vertices. It is provided with a storage case 10 having at least one open surface for storing the battery assembly 40 whose four sides are covered with. Each band portion 51 includes a first surface 52a and a second surface 52b adjacent to each other covering the sides of the battery assembly 40, and the first surface 52a bends its end with a first folding curve 52d. A state in which a first folded curved surface 52c covering a part of the bottom surface 42 of the battery assembly 40 is provided, and the second surface 52b bends its end with a second folding curve 52f and overlaps with the first folding curved surface 52c. A second folded curved surface 52e that covers a part of the bottom surface 42 of the battery assembly 40 is provided, and the vicinity of the first folded curve 52d and the second folded curve 52f is cut at the boundary between the first surface 52a and the second surface 52b. Missing.

Description

The present invention relates to a power supply device.

A power supply device having a large number of secondary battery cells can increase the output voltage by connecting the secondary battery cells in series, so that, for example, a power source for driving an assisted bicycle, an electric cart, a hybrid vehicle, an electric vehicle, etc. It is used for applications that are charged and discharged with a large current.

Since such a power supply device is exposed to shock and vibration, sufficient strength is required. For example, it is conceivable to use a metal frame to reinforce the corners.

However, since stress tends to be concentrated in the corners, it is conceivable that even if it is made of metal, the load becomes large and sufficient strength cannot be maintained.

Japanese Unexamined Patent Publication No. 2004-236450

The present invention has been made in view of such a background in the past, and one of the purposes thereof is to provide a power supply device having increased strength and rigidity.

Means for Solving Problems and Effects of Invention

According to the power supply device according to the first aspect of the present invention, there is a rectangular parallelepiped outer shape including one or more battery cells, and a top surface and a bottom surface separated from each other in a parallel state, and between the top surface and the bottom surface. A battery assembly having a side surface connecting them, and a band portion having an L-shaped horizontal cross section covering each of the four sides connecting the corresponding vertices on the top surface and the bottom surface of the battery assembly, and the above. A power supply device including a storage case having at least one open surface for storing the battery assembly whose four sides are covered with a band portion, and each band portion covers the sides of the battery assembly and is adjacent to each other. The first surface comprises a first surface and a second surface, the first surface having a first folding curved surface having an end thereof bent at a first folding curve to cover a part of the bottom surface of the battery assembly. The two surfaces are provided with a second folded curved surface that covers a part of the bottom surface of the battery assembly in a state where the end portion is bent by a second folded curved surface and overlaps with the first folded curved surface. At the boundary between the surface and the second surface, the shape may be cut out in the vicinity of the first folding curve and the second folding curve. With the above configuration, it is possible to relieve the stress on the corner portion where the stress tends to be concentrated, and the band portion can be protected.

Further, according to the power supply device according to the second side surface, in addition to the above configuration, the bent side screw hole is opened in the first folded curved surface, and the second bent side is opened in the second folded curved surface. The screw holes are opened, and each band portion can be fixed by screwing through the bent side screw hole and the second bent side screw hole. With the above configuration, four band portions can be fixed from the bottom surface of the battery assembly, and workability is improved.

Further, according to the power supply device according to the third side surface, in addition to any of the above configurations, each band portion has the first folded curved surface at the end portion of the first surface and the end portion of the second surface. The second folded curved surface is provided on the surface of the battery assembly, and the bottom surface and a part of the top surface of the battery assembly are covered with the second folded curved surface in a state of being folded with the first folded curved surface, respectively, and fixed by screwing. can do. With the above configuration, the band portions can be fixed on the top surface and the bottom surface of the battery assembly, respectively, and workability is improved.

Furthermore, according to the power supply device according to the fourth side surface, in addition to any of the above configurations, each band portion has at least a partial pair of adjacent sides among the sides adjacent to each other. A pair of side surface holding portions covering the surface and the side surface holding portions are connected at both ends, and a connecting side covering a part of the side constituting the top surface is integrally formed. The first surface and the second surface can be formed. With the above configuration, the band portion can be formed in a U shape and the battery assembly can be held so as to be sandwiched between the side holding portions, so that the workability of assembly is improved and the member and the side surface that hold one side of the top surface are held. The mechanical strength and rigidity can be improved by integrating the members that hold the sides. It is also possible to reduce the weight of the band portion itself by improving the mechanical strength and rigidity.

Furthermore, according to the power supply device according to the fifth aspect, in addition to any of the above configurations, the first surface may be formed wider in the width direction intersecting the second surface in the extension direction. it can.

Furthermore, according to the power supply device according to the sixth side surface, in addition to any of the above configurations, the first side surfaces are arranged on the first side surface of the side surfaces of the battery assembly, and the first side surface is arranged. The two surfaces can be arranged on the second side surface adjacent to the first side surface among the side surfaces of the battery assembly.

Furthermore, according to the power supply device according to the seventh side surface, in addition to any of the above configurations, plate-shaped screw holes are further opened on both sides of the plate shape, and the bottom surface and the top surface of the power supply device are opened. The screws formed at the four corners through which the bent side screw holes and the second bent side screw holes are inserted are passed through the plate side screw holes and passed between the separated screws to be fixed, parallel to each other. A pair of reinforcing plates arranged in can be provided.

Furthermore, according to the power supply device according to the eighth side surface, in addition to any of the above configurations, the reinforcing plate can be arranged parallel to the first side surface.

Furthermore, according to the power supply device according to the ninth side surface, in addition to any of the above configurations, the battery assembly is formed in a vertically long rectangular shape, and each band portion is formed of the rectangular battery. It can be arranged so as to cover each of the long sides of the aggregate. With the above configuration, the long sides of the rectangular battery assembly can be reinforced by the band portions, and the strength of the power supply device can be improved.

Furthermore, according to the power supply device according to the tenth side surface, in addition to any of the above configurations, the battery assembly can be formed in a shape in which a part of a rectangular short side is cut out. .. With the above configuration, a member such as an output terminal can be arranged in a notched space in the storage case.

Furthermore, according to the power supply device according to the eleventh side surface, in addition to any of the above configurations, each band portion can be made of metal.

Furthermore, according to the power supply device according to the twelfth side surface, a battery assembly having a box-shaped outer shape having a top surface and a bottom surface including one or more battery cells, and a top surface and a bottom surface of the battery assembly. A storage case with at least one open surface for storing the band portion having an L-shaped horizontal cross section and the battery assembly whose four sides are covered by the band portion, which cover each of the four sides connecting the corresponding vertices. A power supply device comprising:, each band portion comprising a first surface and a second surface adjacent to each other covering the sides of the battery assembly, the first surface having a first folding curve at its end. It is provided with a first-fold curved surface that is bent at the above to cover a part of the bottom surface of the battery assembly, and the second surface can be shaped by cutting out a certain region from the first-fold curve. With the above configuration, it is possible to relieve the stress on the corner portion where the stress tends to be concentrated, and the band portion can be protected.

It is a perspective view which shows the power-source device which concerns on one Embodiment of this invention. It is a perspective view which looked at the power supply device of FIG. 1 from diagonally below. It is an exploded perspective view of the power supply device of FIG. It is an exploded perspective view of the power supply device of FIG. 3 viewed from diagonally below. It is sectional drawing in the VV line of the power supply device of FIG. It is an exploded perspective view which removed the metal plate from the battery assembly of FIG. It is an exploded perspective view of the battery assembly of FIG. 6 seen from diagonally below. It is an exploded perspective view of the battery assembly of FIG. It is a further exploded perspective view of the battery assembly of FIG. It is an exploded sectional view which shows the state which fastens the battery assembly with a metal plate. It is a perspective view which shows the metal plate of FIG. It is a perspective view which shows the metal plate which concerns on Example 2. FIG. It is a perspective view of the bottom lid part of FIG. It is a perspective view of the canopy part of FIG. FIG. 15A is a cross-sectional view showing a state in which the battery assembly is press-fitted into the bottom lid portion, and FIG. 15B is a cross-sectional view showing a state in which the battery assembly is attracted and press-fitted into the rib. It is an exploded perspective view of the canopy part. It is an exploded perspective view which shows the state which the closed part is inserted into the frame part of FIG. 16 is an exploded perspective view of the canopy portion of FIG. 16 as viewed from diagonally below.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the embodiments shown below exemplify a configuration for embodying the technical idea of the present invention, and the present invention is not specified as the following. Moreover, the member shown in the claims is never specified as the member of the embodiment. In particular, the dimensions, materials, shapes, relative arrangements, and the like of the constituent members described in the embodiments are not intended to limit the scope of the present invention to the specific ones unless otherwise specified. It is just an example of explanation. The size and positional relationship of the members shown in each drawing may be exaggerated to clarify the explanation. Further, in the following description, members having the same or the same quality are shown with the same name and reference numeral, and detailed description thereof will be omitted as appropriate. Further, each element constituting the present invention may be configured such that a plurality of elements are composed of the same member and the plurality of elements are combined with one member, or conversely, the function of one member is performed by the plurality of members. It can also be shared and realized. In addition, the contents described in some examples and embodiments can be used in other embodiments and embodiments.

An example in which the power supply device shown below is mainly applied to a power source for driving an electric vehicle such as an electric vehicle or an electric cart that runs only by a motor will be described. Even if the power supply device of the present invention is used in a hybrid vehicle that runs on both an engine and a motor, or in an application other than an electric vehicle that requires a large output, for example, a power storage device for home or factory use. Good.
(Embodiment 1)

The power supply device 100 according to the first embodiment is shown in FIGS. 1 to 5. In these figures, FIG. 1 is a perspective view showing a power supply device 100 according to an embodiment of the present invention, FIG. 2 is a perspective view of the power supply device 100 of FIG. 1 viewed from diagonally below, and FIG. 3 is a power supply device of FIG. An exploded perspective view of 100, FIG. 4 is an exploded perspective view of the power supply device 100 of FIG. 3 viewed from diagonally below, and FIG. 5 is a sectional view of the power supply device 100 of FIG. 1 taken along the line VV. The power supply device 100 shown in these figures has a box-shaped outer shape and is provided with a handle portion 28 at the upper portion. The box-shaped power supply device 100 has a vertically long rectangular parallelepiped shape and a flat bottom surface so that it can stand upright. The power supply device 100 is capable of outputting electric power to the outside by connecting a plurality of battery cells in series and / or in parallel inside. As shown in FIGS. 2 and 4, an output terminal 33 is provided on the bottom surface, and the output terminal 33 is connected to a power supply target device, for example, an electric vehicle to supply power. Further, the user can attach / detach the power supply device 100 by grasping the handle portion 28.

The power supply device 100 includes a storage case 10, a canopy portion 20, a bottom lid portion 30, and a battery assembly 40, as shown in the exploded perspective views of FIGS. 3 and 4 and the cross-sectional view of FIG. The storage case 10 is hollow and has upper and lower surfaces open so that the battery assembly 40 can be stored inside. The case first opening 11 on the upper surface side of the storage case 10 is closed by the canopy portion 20. Further, the case second opening 12 on the lower surface side of the storage case 10 is closed by the bottom lid portion 30. The storage case 10 is preferably made of metal having excellent heat dissipation and strength. For example, it may be made of aluminum, iron, stainless steel, etc., which is lightweight and has excellent design.
(Heat dissipation sheet 2)

As shown in the exploded perspective views of FIGS. 3 and 4, the battery assembly 40 has a heat radiating sheet 2 and an aramid fiber sheet 3 arranged on the side surfaces thereof, and is covered with the heat radiating sheet 2 and the aramid fiber sheet 3. Is stored in the storage case 10. The heat radiating sheet 2 is made of a flexible member having excellent thermal conductivity, and for example, a silicone-based resin sheet can be used. By interposing the heat radiating sheet 2 between the side surface of the battery assembly 40 and the inner surface of the storage case 10, it is possible to prevent the formation of a gap between the battery assembly 40 and the storage case 10. As a result, an air layer is formed to form a heat insulating layer, and it is possible to avoid a situation in which heat dissipation of the battery assembly 40 is hindered.
(Aramid fiber sheet 3)

Further, the aramid fiber sheet 3 prevents the surface of the battery assembly 40 and the storage case 10 from being scraped at the contact portion to generate powdery foreign matter when the battery assembly 40 is stored in the storage case 10. , A thin flexible sheet material having excellent strength is used. For example, an aramid-based paper sheet is preferably used as the aramid fiber sheet 3.
(Battery assembly 40)

The battery assembly 40 is a member that houses a plurality of secondary battery cells 1. As shown in the cross-sectional view of FIG. 5 and the exploded perspective views of FIGS. 6 and 7, the battery assembly 40 is surrounded by a plurality of metal plates 50 and mechanically fastened. Specifically, the battery assembly 40 has a rectangular parallelepiped outer shape. The rectangular parallelepiped battery assembly 40 has a top surface 41, a bottom surface 42, and a side surface 43. The top surface 41 and the bottom surface 42 are separated from each other in a posture substantially parallel to each other. The side surface 43 connects the top surface 41 and the bottom surface 42. The metal plate 50 is arranged on each side forming the rectangular parallelepiped shape of the battery assembly 40. Further, the metal plates 50 are fixed to each other at the four corners of the top surface 41 and the bottom surface 42 of the battery assembly 40 in a state where the ends of the metal plates 50 are overlapped with each other. With such a configuration, the rectangular parallelepiped shape of the battery assembly 40 is securely fixed and stably held, and the occurrence of resonance and rattling can be suppressed. Further, by gathering the fixing positions on the top surface 41 and the bottom surface 42, it becomes easy to perform the fixing work together and the workability at the time of assembly is improved.

The battery assembly 40 does not have to have a completely rectangular parallelepiped shape, and may have a shape and size that can be stored in the storage case 10, and may have a partially cutout or protruding shape. The battery assembly 40 shown in FIGS. 6 and 7 has a shape in which one side of the bottom surface 42 is cut out. By providing the notch 47, members such as the output terminal 33 can be arranged as shown in FIG. 3 and the like.

As shown in the exploded perspective views of FIGS. 6 to 9, the battery assembly 40 houses a plurality of secondary battery cells 1. Each secondary battery cell 1 is housed in the battery holder 44. In this example, the battery holder 44 is configured by stacking 42 cylindrical secondary battery cells 1. The battery holder 44 is made of resin or the like. The secondary battery cell 1 is provided with electrodes on the end faces of the cylindrical outer cans. Further, the end faces of the secondary battery cells 1 are laminated in an aligned posture, and these are connected in series or in parallel by a lead plate 45 or the like. As the secondary battery cell 1, for example, a lithium ion secondary battery, a nickel hydrogen secondary battery, a nickel cadmium secondary battery, or the like can be used. Further, the secondary battery cell 1 is not limited to a cylindrical one, and other shapes such as a secondary battery cell having a square outer can and a laminated secondary battery cell can also be applied.
(Pin part 46)

The metal plates 50 are fixed to each other by the pin portion 46. The pin portion 46 is fixed by penetrating the metal plate 50 at each of the four corners of the top surface 41 and the bottom surface 42 of the battery assembly 40, with the ends of the metal plates 50 overlapping each other. However, the battery assembly 40 side is not provided with a screw hole or the like for fixing the pin portion 46, and the metal plate 50 is fastened from the outside of the battery assembly 40. As a result, each side is made of metal while avoiding a situation in which resonance occurs due to a dimensional tolerance regarding the position of the screw hole or the like on the battery assembly 40 side or a minute gap such as a manufacturing error of the screw hole size. It can be fastened by pressing with the plate 50.

Each metal plate 50 forms a through hole at each of the four corners of the top surface 41 and the bottom surface 42 of the battery assembly 40 at the end where the adjacent metal plates 50 overlap each other. This makes it easier to securely fix the metal plates 50 arranged on each side of the rectangular parallelepiped battery assembly 40 by pinning. As a result, each side can be reinforced with the metal plate 50 to stably hold the vibration and impact from each direction, and the occurrence of resonance and rattling can be suppressed.

The through hole can be used as a screw hole for inserting a screw. Further, by forming a screw groove on the side surface of the pin portion 46, it can be fixed to the screw hole by screwing with a nut, and the fixing work can be easily performed. In this example, on the top surface side of the battery assembly 40, the pin portion 46 is screwed into the nut inserted into the canopy portion 20. On the bottom surface side, the pin portion 46 is inserted through the bottom lid portion 30 and the nut is screwed.
(Band part 51)

As shown in the exploded perspective views of FIGS. 6 and 7, the metal plate 50 is composed of a plurality of band portions 51 and a reinforcing plate 56. The band portion 51 has at least a part of a pair of adjacent sides within the side forming the battery assembly 40 in the vertical direction, that is, the side where the side surfaces 43 of the battery assembly 40 are joined to each other. cover. Further, the band portion 51 may cover not only the vertical side but also a part of the horizontal side. In the example shown in the exploded perspective view of FIGS. 6 and 7, each band portion 51 is composed of a pair of side surface holding portions 52 and a connecting side 53 connecting the upper ends of the side surface holding portions 52.
(Side holding portion 52)

As shown in the exploded perspective views of FIGS. 6 and 7, the side surface holding portion 52 includes adjacent first surface 52a and second surface 52b that cover the sides of the battery assembly 40. Further, the tip of the first surface 52a is bent along the first folding curve 52d to form the first folding curved surface 52c, which covers a part of the bottom surface 42 of the battery assembly 40.

Further, the first surface 52a of the side surface holding portion 52 is formed wider than the second surface 52b in the width direction intersecting the extension direction. Further, the first surfaces 52a of the plurality of band portions 51 are arranged on the first side surface 43A of the side surfaces 43 of the battery assembly 40. Further, the second surfaces 52b are arranged on the second side surface 43B adjacent to the first side surface 43A among the side surfaces 43 of the battery assembly 40. In the battery assembly 40 shown in FIGS. 6 to 8, the surface on which the lead plate 45 is arranged is the second side surface 43B.

The pair of side holding portions 52 cover at least a part of the vertical side, and one connecting side 53 covers the horizontal side. Here, the connecting side 53 covers the side in the horizontal direction constituting the top surface 41 of the battery assembly 40, on which the reinforcing plate 56 is not arranged. It is preferable that the side surface holding portion 52 and the connecting side 53 are integrally formed. As a result, as shown in FIG. 10, the band portion 51 is formed in a U shape and the battery assembly 40 can be held so as to be sandwiched between the side holding portions 52, so that the workability of assembly is improved and the top surface 41 is formed. The mechanical strength can be improved by integrating the member that holds one side and the member that holds the side of the side surface 43.
(Reinforcing plate 56)

The reinforcing plate 56 is arranged on the horizontal side forming the top surface 41 and the bottom surface 42. The reinforcing plates 56 are arranged on two opposite sides of the top surface 41 and the bottom surface 42, respectively, as shown in the exploded perspective views of FIGS. 6 and 7. It is not necessary to arrange the connecting plate on the side where the connecting side 53 of the band portion 51 is arranged among the sides in the horizontal direction. In this sense, the connecting side 53 of the band portion 51 can be said to be a portion of the reinforcing plate 56 integrated with the pair of side surface holding portions 52.

By aligning the metal plate 50 along each side of the battery assembly 40 in this way, the battery assembly 40 is fastened in a frame shape and pressed so as not to generate an extra gap or the like to prevent rattling. To do. The reinforcing plate 56 does not cover the horizontal side, but is arranged along the horizontal side. On the other hand, the side surface holding portion 52 of the band portion 51 has an L-shaped cross section so as to cover the sides in the vertical direction so as to straddle the adjacent side surfaces 43 and cover the sides at least partially. Further, the connecting side 53 of the band portion 51 also has an L-shaped cross section so as to cover the side in the horizontal direction and straddle between the top surface 41 and the side surface 43 of the battery assembly 40. When fixing the metal plate 50, the upper surface of the metal plate 50 is fixed to the canopy portion 20 in advance as shown in FIG. 10, and the side holding portion 52 is expanded to the left and right to expand the upper surface of the battery assembly 40. When the side surface holding portion 52 is brought into contact with the side surface 43 of the battery assembly 40 and the bottom surface 42 of the battery assembly 40 is fixed by the pin portion 46 from this state, the side surface holding portion 52 is placed on the battery assembly 40. It is a configuration for positioning so as to surely cover the side surface 43 of the 40. By doing so, the side surface 43 of the battery assembly 40 is securely held by the L-shaped cross section of the side surface holding portion 52, and the metal plates 50 are arranged on each side including the side surface 43 of the battery assembly 40. Then, this is securely fastened to prevent the occurrence of resonance.

The reinforcing plate 56 can also have its side edges bent along the extension direction, as shown in the exploded perspective views of FIGS. 6 and 7. As a result, the rib 57 can be erected on the side edge of the reinforcing plate 56 to increase the mechanical strength thereof.

The metal plate 50 and the reinforcing plate 56 are preferably made of iron, aluminum, stainless steel or the like.
(Screw hole)

As described above, the through hole of the metal plate 50 for inserting the pin portion 46 can be used as a screw hole for inserting and fixing the screw. A connecting side screw hole 54 and a bending side screw hole 55 are opened as band side screw holes on both ends of the connecting side 53 of the band portion 51 and the first folding curved surface 52c, respectively. Further, plate-side screw holes 58 are opened at both ends of the reinforcing plate 56. These screw holes form a connecting mechanism for fixing the band portion 51 to the battery assembly 40, the canopy portion 20, the bottom lid portion 30, and the like with the pin portion 46.

As shown in the exploded perspective views of FIGS. 6 and 7, the band portion 51 passes through the pin portion 46, here, the screw, from below the connecting side screw holes 54 on both sides of the connecting side 53 on the upper surface of the battery assembly 40. , The plate-side screw hole 58 opened in the reinforcing plate 56 is inserted and screwed into the canopy portion 20. On the other hand, on the lower surface of the battery assembly 40, screws were inserted from above the first folded curved surface 52c into the plate-side screw holes 58 opened at both ends of the reinforcing plate 56, and the bottom lid portion 30 was penetrated. After that, screw the nut to fix it. In this way, the upper part of the battery assembly 40 is screwed from the lower side to the upper side, and the lower part is screwed from the upper side to the lower side. As a result, the canopy portion 20 can be screwed on the upper surface side without exposing the screw head or the like, and there is an advantage that the screw head or the like does not have to be directly screwed into the battery assembly 40.

A bent side screw hole 55 is opened in the first folded curved surface 52c of the first surface 52a of each band portion 51. Further, the second surface 52b cuts out a certain region from the first folding curve 52d. In this state, each band portion 51 is fixed to the bottom surface 42 of the battery assembly 40 by screwing through the bent side screw hole 55. As a result, the four band portions 51 can be fixed from the bottom surface 42 of the battery assembly 40, and workability is improved.

Further, the reinforcing plate 56 has plate-shaped screw holes 58 on both sides. Then, the screws formed at the four corners of the bottom surface 42 and the top surface 41 of the battery assembly 40 through which the bent side screw holes 55 of the band portion 51 are inserted are passed through the plate side screw holes 58 of the reinforcing plate 56 and separated from each other. It is passed between the screws and fixed.

As shown in the enlarged perspective view of FIG. 11, the side surface holding portion 52 is cut out at the boundary between the first surface 52a and the second surface 52b so that the second surface 52b does not exist in the vicinity of the first folding curve 52d. .. As a result, it is possible to relieve the stress on the corner portion where the stress tends to be concentrated, and the band portion 51 can be protected.
(Example 2)

However, the side holding portion is not limited to the above configuration. In the power supply device 100 according to the first embodiment shown in FIG. 11 described above, the second surface 52b of the side surface holding portion 52 is omitted in the vicinity of the first folding curved surface 52c, so that the corner portion of the first folding curve 52d is formed. It alleviates the concentration of stress.

On the other hand, by adding another member, it becomes possible to further enhance the resistance to stress concentration. For example, in the corner portion of the rectangular parallelepiped battery assembly in which the stress concentration is structurally intense, in order to further alleviate the stress concentration, the structure may be such that the region corresponding to the corner portion is cut out in the side surface holding portion. Here, the side holding portion 52'of the power supply device according to the second embodiment is shown in the perspective view of FIG. The side surface holding portion 52'shown in this figure includes a first surface 52a'and a second surface 52b', as in FIG. 11 and the like. The first surface 52a'provides a first folding curved surface 52c' whose end is bent along a first folding curve 52d' to cover a part of the bottom surface 42 of the battery assembly 40. The first folded curved surface 52c'opens a screw hole 55' on the bent side.

Further, the second surface 52b'is a second folding curved surface that covers a part of the bottom surface 42 of the battery assembly 40 in a state where the end portion is bent by the second folding curve 52f and overlapped with the first folding curved surface 52c'. It is equipped with 52e'. The second folded curved surface 52e'opens the second bent side screw hole 55b'. The second bent side screw hole 55b'is aligned with the bent side screw hole 55' of the first folded curved surface 52c', and the pin portion can be inserted and fixed. Here, the pin portion is fixed as a screw by screwing. Then, at the boundary between the first surface 52a'and the second surface 52b', the vicinity of the first folding curve 52d'and the second folding curve 52f' is cut out. As a result, it is possible to relieve the stress on the corner portion where the stress is likely to be concentrated, and the band portion 51'can be protected. That is, the battery assembly 40 is provided with a first folded curved surface 52c'at the end of the first surface 52a'of each band portion 51'and a second folded curved surface 52e'at the end of the second surface 52b'. The bottom surface 42 and a part of the top surface 41 of the battery assembly 40 are covered with the second folded curved surface 52e'in a state of being folded with the first folded curved surface 52c', respectively, and fixed by screwing. The band portion 51'is fixed at the bottom surface 42 and the band portion 51', respectively, to enhance the integrity.
(Aggregate guide rib 32)

Further, at least one of the canopy portion 20 or the bottom lid portion 30 has a plurality of assembly guide ribs 32 that come into contact with the battery assembly 40, which are separated from each other and protrude from the inner surface. By providing such an assembly guide rib 32, the gap between the storage case 10 and the battery assembly 40 is filled at the same time as the storage case 10 is fitted, and the battery assembly 40 and the storage case 10 are integrated. It is possible to prevent rattling from occurring due to a gap between the battery assembly 40 and the battery assembly 40 in the storage case 10, and thus it is possible to suppress the occurrence of resonance.

In the present embodiment, as shown in FIGS. 13 and 14, the first rib 32A and the second rib 32B are formed as the aggregate guide ribs 32 on the canopy portion 20 and the bottom lid portion 30, respectively. These aggregate guide ribs 32 are formed in a tapered shape so that the end edge becomes wider toward the open end side. As a result, as shown in FIGS. 15A to 15B, the battery assembly 40 can be easily attracted to and fitted into the assembly guide rib 32. In addition, a rib having a bent end edge is formed in advance on the metal plate 50, and the rib is configured to partially cover the side surface of the battery assembly 40, so that when the battery assembly 40 is fitted. The assembly guide rib 32 presses the rib, and the battery assembly 40 can be fitted to the canopy portion 20 and the bottom lid portion 30 with a more uniform stress.

Further, the aggregate guide ribs 32 are formed at opposite portions on the inner surfaces of the canopy portion 20 and the bottom lid portion 30, respectively. When the canopy portion 20 and the bottom lid portion 30 have a rectangular shape, aggregate guide ribs 32 are formed on opposite sides, respectively. In the examples shown in FIGS. 13 and 14, aggregate guide ribs 32 are formed on each side forming the rectangular shape of the canopy portion 20 and the bottom lid portion 30. However, the aggregate guide ribs 32 formed on each side and the aggregate guide ribs 32 formed on the same side do not have to have the same shape, and have a shape of a portion that abuts and holds the battery assembly 40. It can be changed as appropriate. The plurality of aggregate guide ribs 32 are formed so as to be parallel to each other and separated from each other. Each aggregate guide rib 32 is formed in an L shape in a side view. Further, it is preferable that the aggregate guide rib 32 is integrally formed with the canopy portion 20 and the bottom lid portion 30.

Further, a corner portion formed separately from the canopy portion 20 may be provided at a corner portion on the inner surface of the canopy portion 20. The corner portion is provided with a third invitation rib. As a result, by combining the aggregate guide rib 32 at the corner of the inner surface of the canopy portion 20, which is difficult to be injection molded, as a separate member, the aggregate guide rib 32 can be arranged also at the corner, and a gap is formed at the corner. It is possible to avoid the situation where it is caused and suppress the occurrence of rattling and resonance.
(Canopy 20)

The canopy portion 20 is fixed to the upper surface of the storage case 10 and closes the case first opening 11 of the storage case 10. Further, the canopy portion 20 is provided with a handle portion 28 for gripping by the user on the upper portion thereof. Here, an exploded perspective view of the canopy portion 20 is shown in FIGS. 16 to 18. In these figures, FIG. 16 is an exploded perspective view of the canopy portion, FIG. 17 is an exploded perspective view showing a state in which the closed portion is inserted into the frame portion of FIG. 16, and FIG. 18 is a view of the canopy portion of FIG. The disassembled perspective views are shown respectively. The canopy portion 20 shown in these figures is divided into three members, and is composed of a cover portion 21 which is a first case, a closing portion 22 which is a second case, and a frame portion 23 which is a third case. The cover.
(Frame part 23)

The frame portion 23 is connected to the case first opening 11 of the storage case 10. The frame portion 23 has a handle frame 24 that forms a part of the handle portion 28. Therefore, the frame portion 23 uses a high-strength resin so that the handle frame 24 exhibits sufficient mechanical strength. In addition, the handle portion 28 is structurally configured to be reinforced by erecting ribs or the like. However, the appearance deteriorates due to the configuration that increases the mechanical strength. Therefore, the upper surface of the frame portion 23 is covered with the cover portion 21.
(Cover 21)

The cover portion 21 covers the upper surface of the frame portion 23 including the handle frame 24. By covering the frame portion 23 with the cover portion 21 in this way, it is possible to hide the upper surface of the frame portion 23 without exposing it to the outside. In other words, the upper surface of the frame portion 23 can adopt a configuration specialized for improving the strength without worrying about the appearance. On the other hand, by improving the appearance design of the cover portion 21, the appearance of the canopy portion 20 can be improved. By separating the frame portion 23 that emphasizes the strength of the handle portion 28 and the cover portion 21 that emphasizes the design of the appearance as separate members, it is possible to achieve both strength and appearance.

By forming the canopy portion 20 with a plurality of members in this way, the function of reinforcing the handle portion 28, the function of improving the design of the canopy portion 20, and the accumulation of the resin member constituting the canopy portion 20 are eliminated. As a result, it is possible to fulfill the function of avoiding deterioration of the appearance due to resin shrinkage or the like. That is, since the canopy portion is conventionally composed of one member, if the strength of the handle portion 28 is to be improved, the design will be deteriorated, and if the resin member is made thicker to increase the strength, the design will be deteriorated and the resin will be hardened. There was a problem that the shrinkage that sometimes occurred became large and the appearance quality deteriorated. Therefore, by preparing the frame portion 23 that emphasizes strength and covering the frame portion 23 or preparing the bar portion to give the cover portion 21 a design, the appearance can be adjusted and the appearance can be improved.

The frame portion 23 forms a frame opening 25 that communicates with the case first opening 11 in a state of being connected to the storage case 10. The handle frame 24 of the frame portion 23 is formed in a posture of crossing the frame opening 25. In the examples shown in FIGS. 16 to 18, the frame opening 25 is formed so that the frame portion 23 has a rectangular shape along the periphery of the case first opening 11 and the handle frame 24 has a T shape in a plan view. It is provided as a bridge. Further, the lower side of the upper horizontal bar 26 constituting the T-shape is opened to the side surface.
(Closed part 22)

Further, in the canopy portion 20, the closing portion 22 is arranged between the frame portion 23 and the cover portion 21, and the closing portion 22 closes the frame opening portion 25. As a result, while forming the handle frame 24 that crosses the frame opening 25, the frame opening 25 is closed by the closing portion 22 of another member, which facilitates the molding of the frame portion 23. Further, by making the cover portion 21 which constitutes the bottom surface visible through the frame opening 25 a separate member, it is possible to design in consideration of the design such as the color and shape of the cover portion 21.

Further, the closed portion 22 is formed in a curved surface shape with a recessed center. As a result, when the user grips the handle portion 28, a wide space for inserting a hand is secured and the handle portion 28 can be easily gripped. In addition, by eliminating the edge of the step as a curved surface, the inserted hand does not hit the edge, and a comfortable feeling of use can be obtained. In addition, the curved surface improves the design. Further, by providing an opening under the horizontal bar 26 and forming the closing portion 22 located below the horizontal bar 26 low at this portion and forming the opposite side high at this portion, dust, water droplets, etc. are formed on the upper surface of the closing portion 22. When the foreign matter is accumulated, the side of the horizontal bar 26 is tilted so as to have a downward slope, so that the foreign matter accumulated in the recess of the closing portion 22 can be smoothly discharged through the opening.

Further, as shown in FIGS. 1, 16, 17, 17 and the like, the cover portion 21 has a frame-shaped cover frame 27 formed on its side surface. The cover frame 27 is continuous with the curved surface of the closing portion 22 from the cover frame 27 so as to have the same surface as the closing portion 22 in a state where the cover portion 21 and the closing portion 22 are joined. I am trying to change to. As a result, when the user inserts his / her hand to grip the handle 28, he / she can guide the hand more smoothly.

These canopy portions 20 are preferably made of a resin that is lightweight and has excellent insulating properties. For example, PBT (polybutylene terephthalate), PC (polycarbonate) resin and the like can be preferably used. Further, taking advantage of the canopy portion 20 being composed of a plurality of members, the canopy portion 20 may be composed of different members. For example, the frame portion 23 may be made of a resin having high strength or a metal having higher rigidity. In addition, the color of the members can be made different for each member. For example, the lid of the closing portion 22 may be made of different colors to produce a variety of products such as products of different colors.

As shown in FIGS. 16 to 18, the cover portion 21 is fixed by screwing from the back surface side of the frame portion 23. As a result, the canopy portion 20 has an outer shape that does not expose the screw holes. On the other hand, the bottom lid portion 30 is fixed with screws from the bottom surface 42 as shown in FIG. 3 and the like. However, the screw holes can be prevented from being exposed by closing the screw holes with the screw cover 34.

The power supply device according to the present invention can be suitably used as a power supply device for electric carts, electric scooters, electric vehicles, hybrid vehicles, and the like. In addition, a backup power supply device that can be mounted in a computer server rack, a backup power supply device for wireless base stations such as mobile phones, a power storage device for home use and factories, a power storage device for street lights, etc. , Can also be used as appropriate for backup power supplies such as traffic lights.

100 ... Power supply device 1 ... Secondary battery cell 2 ... Heat dissipation sheet 3 ... Aramid fiber sheet 10 ... Storage case 11 ... Case first opening 12 ... Case second opening 20 ... Canopy part 21 ... Cover part 22 ... Closing part 23 ... Frame part 24 ... Handle frame 25 ... Frame opening 26 ... Horizontal bar 27 ... Cover frame 28 ... Handle part 30 ... Bottom lid part 32 ... Assembly guide rib; 32A ... First rib; 32B ... Second rib 33 ... Output Terminal 34 ... Screw cover 40 ... Battery assembly 41 ... Top surface 42 ... Bottom surface 43 ... Side surface; 43A ... First side surface; 43B ... Second side surface 44 ... Battery holder 45 ... Lead plate 46 ... Pin part 47 ... Notch part 50 ... Metal plates 51, 51'... Band portions 52, 52'... Side holding portions; 52a, 52a'... First surface; 52b, 52b' ... Second surface; 52c, 52c' ... First folding curved surface; 52d, 52d '... 1st folding curve; 52e' ... 2nd folding curved surface; 52f' ... 2nd folding curve 53 ... Connecting side 54 ... Connecting side screw holes 55, 55'... Folding side screw holes; 55b' ... Second folding Side screw hole 56 ... Reinforcing plate 57 ... Rib 58 ... Plate side screw hole

Claims (12)

A battery assembly including one or more battery cells having a rectangular parallelepiped outer shape and having a top surface and a bottom surface separated from each other in a parallel state, and a side surface connecting these between the top surface and the bottom surface.
A band portion having an L-shaped horizontal cross section that covers each of the four sides connecting the corresponding vertices on the top surface and the bottom surface of the battery assembly.
A storage case having at least one open surface for storing the battery assembly whose four sides are covered with the band portion.
It is a power supply device equipped with
Each band portion comprises a first surface and a second surface adjacent to each other covering the sides of the battery assembly.
The first surface comprises a first-fold curved surface whose end is bent at a first-fold curve to cover a part of the bottom surface of the battery assembly.
The second surface includes a second folded curved surface that covers a part of the bottom surface of the battery assembly in a state where the end portion is bent by a second folded curve and overlaps with the first folded curved surface.
A power supply device that cuts out the vicinity of the first folding curve and the second folding curve at the boundary between the first surface and the second surface. The power supply device according to claim 1.
A screw hole on the bent side is opened on the first folded curved surface.
A screw hole on the second bent side is opened on the second folded curved surface.
A power supply device in which each band portion is fixed by screwing through the bent side screw hole and the second bent side screw hole. The power supply device according to claim 2.
Each band portion is provided with the first folded curved surface at the end of the first surface and the second folded curved surface at the end of the second surface.
A power supply device in which a part of the bottom surface and the top surface of the battery assembly is covered with a second folded curved surface in a state of being folded with the first folded curved surface, and fixed by screwing. The power supply device according to claim 3.
Each band part
A pair of side holding portions that at least partially cover the pair of adjacent sides among the sides adjacent to each other.
A connecting side that connects the side surface holding portions at both ends and covers a part of the side that constitutes the top surface, and
Is integrally configured,
A power supply device in which the first surface and the second surface are formed on each side surface holding portion. The power supply device according to any one of claims 2 to 4.
A power supply device in which the first surface is formed wider in the width direction intersecting the second surface in the extension direction. The power supply device according to any one of claims 2 to 5.
The first surfaces are arranged on the first side surface of the side surfaces of the battery assembly.
A power supply device in which the second surfaces are arranged on a second side surface adjacent to the first side surface of the side surfaces of the battery assembly. The power supply device according to any one of claims 2 to 6, further comprising:
Plate-side screw holes are opened on both sides of the plate,
The screws formed at the four corners of the bottom surface and the top surface of the power supply device through which the bent side screw holes and the second bent side screw holes are inserted are passed through the plate side screw holes and are separated from each other. A power supply with a pair of reinforcing plates arranged parallel to each other to be passed and fixed to each other. The power supply device according to claim 7.
The reinforcing plate is a power supply device arranged in parallel with the first side surface. The power supply device according to any one of claims 1 to 8.
The battery assembly is formed in a vertically long rectangular shape.
A power supply device in which each band portion is arranged so as to cover the long side of the rectangular battery assembly. The power supply device according to claim 9.
A power supply device in which the battery assembly is formed in a shape in which a part of a rectangular short side is cut out. The power supply device according to any one of claims 1 to 10.
A power supply in which each band is made of metal. A box-shaped battery assembly containing one or more battery cells and having a top surface and a bottom surface,
A band portion having an L-shaped horizontal cross section that covers each of the four sides connecting the corresponding vertices on the top surface and the bottom surface of the battery assembly.
A storage case having at least one open surface for storing the battery assembly whose four sides are covered with the band portion.
It is a power supply device equipped with
Each band portion comprises a first surface and a second surface adjacent to each other covering the sides of the battery assembly.
The first surface comprises a first-fold curved surface whose end is bent at a first-fold curve to cover a part of the bottom surface of the battery assembly.
The second surface is a power supply device formed by cutting out a certain region from the first folding curve.

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