JP2022187816A - storage battery system - Google Patents

Abstract

To provide an improved storage battery system having a structure in which a battery module is housed in a battery case.SOLUTION: A storage battery system 1 includes a lower case 10 and battery modules B1, B2 housed in the lower case 10. The lower case 10 has a bottom plate 13 on which the battery modules B1, B2 are mounted, side surfaces S1, S2, and a fixing component 71 fixed to the bottom plate 13. The battery modules B1, B2 include a fixing component 81 fixed to a side surface S3 and mating with the fixing component 71, and a fixing component 82 fixed to a side surface S4 and screwed to the bottom plate 13, respectively. Thus, there is no need to screw the fixing components 71, 81, so that there is no need to secure a work space between the side surfaces S1, S3. while a work space to insert an electric tool and the like is secured between the side surfaces S2, S4.SELECTED DRAWING: Figure 9

Description

TECHNICAL FIELD The present invention relates to a storage battery system, and more particularly to a storage battery system having a structure in which battery modules are housed in a battery case.

As shown in Patent Documents 1 and 2, a storage battery system has a configuration in which various modules such as a battery module and a control box are housed in a battery case. Since the battery module is relatively heavy, it must be firmly fixed to the battery case. In order to firmly fix the battery module to the battery case, it is necessary to fix the battery module to the battery case at multiple points.

JP 2013-105723 A JP 2015-225703 A

However, in order to fix the battery module to the battery case at a plurality of locations, a plurality of work spaces are required for inserting power tools and the like into the battery case, which causes the problem of increasing the size of the battery case. Such a problem is particularly problematic when the housing of the battery case is a cylindrical body having an integral structure, because the housing cannot be disassembled.

The present invention has been made in view of the above problems, and an object thereof is to provide an improved storage battery system having a structure in which battery modules are housed in a battery case.

A storage battery system according to the present invention is a storage battery system comprising a battery case and battery modules housed in the battery case, wherein the battery case has a bottom plate on which the battery modules are placed, and is perpendicular to the bottom plate, The battery module has first and second side surfaces parallel to each other and a first fixing component fixed to the bottom plate. a fourth side facing the second side; a second fixing part fixed to the third side and fitted with the first fixing part; and a fourth side fixed to the fourth side and screwed to the bottom plate. 3 fixed parts, wherein the distance between the second side and the fourth side is greater than the distance between the first side and the third side.

According to the present invention, since it is not necessary to screw the first fixing part and the second fixing part, a working space for inserting an electric tool or the like can be saved between the first side face and the third side face. no need to secure. On the other hand, since a work space is provided between the second side and the fourth side for inserting power tools, etc., it is possible to easily screw the third fixing part to the bottom plate. Become.

In the present invention, the battery case has a housing including first and second side surfaces, and the housing has a structure in which two parallel sides of a single rectangular plate member are joined together and fixed. I don't mind. A housing having such a structure cannot be disassembled, and it is necessary to work from the upper opening. can be made smaller.

In the present invention, the first fixing part includes a vertical part extending parallel to the first side surface, one end of which is fixed to the bottom plate, and the other end of the vertical part protruding toward the battery module. the second fixing component has a vertical portion fixed to the third side and a horizontal portion projecting from the end of the vertical portion toward the first side; and the first fixing part and the second fixing part are arranged such that the horizontal part of the second fixing part is inserted between the bottom plate and the horizontal part of the first fixing part. It does not matter if they are fitted. According to this, it is possible to easily fit the battery modules by sliding them horizontally.

As described above, according to the present invention, it is possible to securely fix the battery module by securing only one work space.

FIG. 1 is a schematic perspective view showing the appearance of a storage battery system 1 according to one embodiment of the present invention. FIG. 2 is a schematic perspective view showing the appearance of the storage battery system 1. As shown in FIG. FIG. 3 is a schematic perspective view of the storage battery system 1. FIG. FIG. 4 is a schematic perspective view of the storage battery system 1. FIG. FIG. 5 is a schematic perspective side view showing a state in which the electrical conduit cover 50 is attached to the storage battery system 1. As shown in FIG. FIG. 6 is a schematic perspective view showing a state before laminating the upper case 20 on the lower case 10. FIG. FIG. 7 is a schematic perspective view for explaining a method of connecting the lower case 10 and the upper case 20 by the connecting member 60. As shown in FIG. FIG. 8 is a schematic cross-sectional view for explaining a method of connecting the lower case 10 and the upper case 20 by the connecting member 60. As shown in FIG. FIG. 9 is a substantially see-through front view seen from the Y direction for explaining a method of fixing the battery modules B1 and B2 to the lower case 10. FIG. FIG. 10 is a schematic perspective side view seen from the X direction for explaining a method of fixing the battery modules B1 and B2 to the lower case 10. FIG.

Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

1 and 2 are schematic perspective views showing the appearance of a storage battery system 1 according to one embodiment of the present invention. 3 and 4 are schematic perspective views of the storage battery system 1, and FIG. 5 is a schematic perspective side view showing a state in which the electrical conduit cover 50 is attached to the storage battery system 1. FIG.

As shown in FIGS. 1 to 5, the storage battery system 1 according to the first embodiment of the present invention includes a battery case consisting of a lower case 10 and an upper case 20, and battery modules B1 and B2 accommodated in the lower case 10. , a battery module B3 housed in an upper case 20, a control box H and a converter circuit D. As shown in FIG. The two battery modules B1 and B2 are housed in the lower case 10 because the battery modules B1 and B2 are heavy, and the upper case 20 houses the control box H and the converter circuit D. , the control box H and the converter circuit D generate a large amount of heat. The lower case 10 has fixing metal fittings 14 for fixing to the base. The upper case 20 is stacked on the lower case 10 and fixed to the lower case 10 using two connecting members 60 . As shown in FIG. 3, the battery modules B1 to B3 are accommodated offset in the X direction. The space S is used as a working space, which will be described later, and is also used as an accommodation space for passing cables such as power lines and signal lines.

The lower case 10 includes a first housing 11 in the shape of a quadrangular prism having openings in the vertical direction (in the Z direction), a first top plate 12 that closes the upper opening of the first housing 11, and the first housing. and a first bottom plate 13 closing the lower opening of 11 . Similarly, the upper case 20 includes a second casing 21 in the shape of a square prism having openings in the upper and lower directions (in the Z direction), a second top plate 22 closing the upper opening of the second casing 21, and a second 2 and a second bottom plate 23 that closes the lower opening of the housing 21 . Each of the first housing 11 and the second housing 21 is a single rectangular plate-shaped member, for example, a member obtained by bending a pre-coated material called a color steel plate. are fixed together, and by seaming at the seaming portions 11a and 21a extending in the Z direction, the square columnar cylinder having upper and lower openings as a whole and having four faces in the inner cavity have a shape.

As described above, the battery case according to the present embodiment uses the first housing 11 and the second housing 21 formed by bending a single metal plate into a cylindrical shape. There is no seam other than the seams, and it is possible to obtain high waterproofness. Moreover, since a single metal plate is processed into a cylindrical shape, it is possible to obtain sufficient mechanical strength in the Z direction even when using a relatively thin metal plate. Here, the four surfaces of the first housing 11 and the second housing 21 are composed of the front surface and rear surface forming the XZ plane, and both side surfaces forming the YZ plane. The front and back surfaces forming the XZ plane are larger in area than both side surfaces forming the YZ plane. That is, the X direction is the long side, and the Y direction is the short side.

The three battery modules B1-B3 are connected to a converter circuit D via a control box H. The converter circuit D is a DCDC converter for keeping the DC voltage constant, and generates a large amount of heat by its operation. Heat generated by the converter circuit D is dissipated by a heat sink 41 provided on the rear surface of the upper case 20 . Further, inside the upper case 20, by covering the converter circuit D with the heat isolation wall 42, heat conduction to the battery module B3 and the control box H is suppressed.

As shown in FIG. 5, a grommet 31 is provided on the rear surface of the first housing 11 that constitutes the lower case 10 for passing the electrical conduit 51 therethrough. Further, grommets 32 to 34 for passing electric conduits 51 to 53 are provided on the rear surface of the second housing 21 that constitutes the upper case 20 . Power lines and signal lines that connect the battery modules B1, B2 and the control box H are housed inside the conduit 51 . Power lines and signal lines for connecting the converter circuit D and an external power conditioner are housed inside the electric conduits 52 and 53, respectively. These grommets 31-34 and electrical conduits 51-53 are covered by electrical conduit covers 50 provided on the rear surfaces of the first and second housings 11 and 21, respectively. As a result, after stacking the lower case 10 and the upper case 20, both can be connected by wiring, and workability is improved. In addition, since the conduit cover 50 can be easily waterproofed, not only the reliability and durability are improved, but also the design is improved.

FIG. 6 is a schematic perspective view showing a state before laminating the upper case 20 on the lower case 10. FIG.

As shown in FIG. 6, connecting members 60 are fixed to both short sides extending in the Y direction of the first top plate 12 constituting the lower case 10 . The connecting member 60 is a metal component having an L-shaped XZ cross section, and as shown in FIGS. 7 and 8, has a horizontal portion 61 having an XY plane and a vertical portion 62 having a YZ plane. . Here, the second bottom plate 23 includes a protruding portion 23a protruding in the Z direction from the short side extending in the Y direction toward the first top plate 12, and a tip of the protruding portion 23a folded back inward in the X direction. The upper case 20 is positioned by fitting the projecting portion 23a and the folded portion 23b inside the pair of connecting members 60. As shown in FIG. As a result, the horizontal portion 61 of the connecting member 60 is positioned between the first top plate 12 and the folded portion 23b, and the vertical portion 62 of the connecting member 60 overlaps the projecting portion 23a in the X direction. The first top plate 12 and the connecting member 60 are fixed to each other by connecting the first top plate 12 and the horizontal portion 61 with screws 64. 62 are connected by screws 63 to be fixed together. Also, the first top plate 12 and the horizontal portion 61 may be fixed by a waterproof double-sided tape 65 instead of or in addition to the screws 64 .

With such a configuration, the lower case 10 and the upper case 20 can be easily fixed, so that the lower case 10 accommodating the battery modules B1 and B2, the battery module B3, the control box H and the converter circuit D are accommodated. By preparing the upper case 20 and stacking both, the storage battery system 1 can be installed. Moreover, when the connecting member 60 is used to connect the lower case 10 and the upper case 20 , a space corresponding to the height of the vertical portion 62 is formed between the first top plate 12 and the second bottom plate 23 . Therefore, the heat mainly generated from the converter circuit D is less likely to be transferred to the lower case 10, and the air flows from the long side extending in the X direction, thereby enhancing the heat dissipation effect.

9 and 10 are diagrams for explaining a method of fixing the battery modules B1 and B2 to the lower case 10. FIG. 9 is a substantially see-through front view seen from the Y direction, and FIG. 10 is a view seen from the X direction. It is a substantially see-through side view.

As shown in FIG. 9, fixed parts 71 and 72 made of metal or the like are fixed to the first bottom surface 13 constituting the lower case 10 . The fixed part 71 has an L-shaped structure in the XZ cross section and extends in the Y direction. One end (lower end) of the vertical portion extending in the Z direction when viewed from the Y direction is fixed to the first bottom surface 13, and the fixed component 71 extends in the X direction from the other end (upper end) of the vertical portion. The existing horizontal portions protrude toward the battery modules B1, B2. The fixed component 72 is a plate-like body extending in the Y direction and arranged in the space S. As shown in FIG. The fixed part 72 is fixed to the first bottom surface 13 on the XY plane.

On the other hand, fixing parts 81 and 82 made of metal or the like are fixed to the lower part of one YZ side surface S3 of the battery modules B1 and B2. The fixed part 81 is fixed to the lower part of the YZ side surface S3, has an L-shaped structure in the XZ cross section, and extends in the Y direction. The fixed part 81 is fixed to the YZ side surfaces S3 of the battery modules B1 and B2 on the YZ surface of the vertical portion extending in the Z direction, and extends from the end of the vertical portion toward the one side surface S1 of the first housing 11 in the X direction. The horizontal part protruding in the direction is fitted with the fixing part 71 . The fixed part 82 is fixed to the lower part of the other YZ side surface S4 of the battery modules B1 and B2, has an L-shaped XZ cross section, and extends in the Y direction. The fixed part 82 has its YZ surface fixed to the YZ side surface S4 of the battery modules B1 and B2, and its portion protruding in the X direction is screwed to the fixed part 72 to be fixed to the first bottom surface 13 . The fixing part 82 may be fixed directly to the fixing part 72 and the first bottom surface 13 by screwing the fixing part 82 to both the fixing part 72 and the first bottom surface 13 . By doing so, the fixing part 82 and the first bottom surface 13 may be indirectly fixed.

When the battery modules B1 and B2 are accommodated inside the lower case 10, one YZ side surface S3 of the battery modules B1 and B2 faces one YZ side surface S1 of the first housing 11, and the battery modules B1 and B2 face each other. After the other YZ side surface S4 of B2 is accommodated so as to face the other YZ side surface S2 of the first housing 11, the battery modules B1 and B2 are slid in the X direction. As a result, the horizontal part of the fixing part 81 is inserted between the first bottom surface 13 and the horizontal part of the fixing part 71 , and the L-shaped fixing part 81 fits into the L-shaped fixing part 71 . After that, the power tool 90 is put into the space S and the fixing parts 72 and 82 are screwed. Thereby, the battery modules B1 and B2 are securely fixed inside the lower case 10 . In this manner, one YZ side surface of the battery modules B1 and B2 is positioned by fitting the fixing parts 71 and 81 without screwing, and the other YZ side surface of the battery modules B1 and B2 is screwed. Therefore, the fixing of the battery modules B1 and B2 is completed by the operation from one side using the power tool 90 . Therefore, the distance W1 in the X direction between the YZ side S1 of the first housing 11 and the side S3 of the battery modules B1 and B2 is the X direction distance between the YZ side S2 of the first housing 11 and the side S4 of the battery modules B1 and B2. can be made sufficiently narrower than the distance W2 in , and miniaturization is achieved. The fixing of the battery module B3 to the upper case 20 can also be carried out in the same manner.

Thus, in this embodiment, it is possible to fix the battery modules B1 to B3 using the space S formed by offsetting the housing positions of the battery modules B1 to B3. Moreover, the battery modules B1 to B3 can be easily removed by unscrewing the fixing parts 72 and 82 during maintenance or replacement.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention. Needless to say, it is included within the scope.

For example, in the above embodiment, the lower case 10 accommodates the two battery modules B1 and B2, and the upper case 20 accommodates the battery module B3, the control box H, and the converter circuit D. The number and types of modules accommodated in 20 are not particularly limited. Moreover, although the two cases 10 and 20 are stacked in the above embodiment, the storage battery system may be configured by stacking three or more cases.

1 storage battery system 10 lower case 11 first housing 11a seam tightening portion 12 first top plate 12a opening 13 first bottom surface 14 fixing bracket 20 upper case 21 second housing 21a seam tightening portion 22 second top plate 23 second Bottom surface 23a Protruding portion 23b Folded portion 23c Opening 23d Protruding portions 31-34 Grommet 41 Heat sink 42 Heat isolation wall 50 Conduit cover 51-53 Conduit 60 Connecting member 61 Horizontal portion 62 Vertical portions 63, 64 Screw 65 Waterproof double-sided tape 71 , 72, 71, 81 Fixed parts 90 Electric tools B1 to B3 Battery module D Converter circuit H Control box S Space

Claims (3)

a battery case;
and a battery module housed in the battery case,
The battery case includes a bottom plate on which the battery module is mounted, first and second side surfaces perpendicular to the bottom plate and parallel to each other, and a first fixing member fixed to the bottom plate. have
The battery module has a third side face facing the first side face of the battery case, a fourth side face facing the second side face of the battery case, and is fixed to the third side face. A second fixing part that fits with the first fixing part, and a third fixing part that is fixed to the fourth side surface and screwed to the bottom plate,
The storage battery system, wherein the distance between the second side and the fourth side is greater than the distance between the first side and the third side. The battery case has a housing including the first and second side surfaces,
2. The storage battery system according to claim 1, wherein the housing has a structure in which two parallel sides of a rectangular plate-like member are brought together and fixed. The first fixing component includes a vertical portion extending parallel to the first side surface, one end of which is fixed to the bottom plate, and a vertical portion extending from the other end of the vertical portion toward the battery module. having an L-shaped structure with a protruding horizontal portion;
The second fixing component has an L-shaped structure having a vertical portion fixed to the third side surface and a horizontal portion projecting from an end of the vertical portion toward the first side surface. ,
The first fixing part and the second fixing part are fitted so that the horizontal part of the second fixing part is inserted between the bottom plate and the horizontal part of the first fixing part. The storage battery system according to claim 1 or 2, characterized by:

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