JP7363997B1 - storage battery system - Google Patents

Abstract

An object of the present invention is to provide a storage battery system with improved waterproofness. [Solution] In a storage battery system 10A, a top plate 31a of a main body 31 of a battery case 30A is tilted downward from the front end toward the rear end with respect to a horizontal plane, so that the top plate 31a is tilted downward from the front end toward the rear end. Water droplets 50 are prevented from accumulating for a long time. This prevents the water droplets 50 from being present in the vicinity of the packing 40, and even when the inside of the battery case 30A becomes negative pressure, the water droplets 50 do not infiltrate into the interior through the packing 40. It's getting difficult. Therefore, high waterproofness is achieved in the storage battery system 10A. [Selection diagram] Figure 5

Description

The present invention relates to a storage battery system.

2. Description of the Related Art Conventionally, storage battery systems are known that include a battery module and a battery case that houses the battery module therein. Patent Documents 1 and 2 listed below disclose battery cases having a cylindrical portion extending in the vertical direction and a top plate portion that is placed over the upper opening of the cylindrical portion via a packing. According to such a battery case, the top plate part prevents rainwater, thereby realizing a waterproof structure inside.

JP 2021-190378 Publication

In the above-mentioned storage battery system, the internal pressure may become negative due to a temperature difference between the inside and outside of the battery case, and rainwater or the like may easily enter the inside. After intensive research, the inventors discovered a new technology that can further improve waterproofness.

One aspect of the present invention is to provide a storage battery system with improved waterproofness.

A storage battery system according to one aspect of the present invention includes a battery module and a battery case having a housing space in which the battery module is housed, and the battery case has a top plate located above the battery module and a battery module on the side. A main body part having a pair of side walls sandwiched from one side and defining a front opening, a front lid part having an eaves part that covers the front opening of the main body part and covering the top plate part from the outside, and a top part of the main body part. A packing is interposed between the plate part and the eave part of the front lid part and closes the gap between the top plate part of the main body part and the eave part of the front lid part, and the top plate part of the main body part is on a horizontal plane. On the other hand, it slopes downward from the front end to the rear end.

In the above storage battery system, the top plate of the main body of the battery case is inclined downward from the front end toward the rear end with respect to the horizontal plane, making it difficult for water to accumulate on the top plate for a long time. ing. Therefore, the situation where rainwater, etc. exists near the packing is suppressed, and even when the inside of the battery case becomes negative pressure, it is difficult for rainwater, etc. to infiltrate inside the battery case through the packing. . Therefore, the above-mentioned storage battery system can improve waterproofness.

In the storage battery system according to another aspect, the battery case further includes a front end support part that raises the lower front end of the main body part.

In the storage battery system according to another aspect, the top plate portion and the pair of side wall portions of the main body portion are arranged in a U-shape.

In the storage battery system according to another aspect, the main body further includes a rear wall portion that closes the main body from the rear side and faces the front lid.

In the storage battery system according to the other aspect, the rear wall portion extends in the vertical direction.

In the storage battery system according to another aspect, the main body portion is composed of a single plate member.

According to various aspects of the present invention, a storage battery system with improved waterproofness is provided.

FIG. 1 is a perspective view showing a storage battery system according to an embodiment. FIG. 2 is a perspective exploded view of the storage battery system shown in FIG. 1. FIG. 3 is an exploded view of the main body of the battery case shown in FIG. 2. FIG. 2 is a sectional view taken along the line IV-IV of the storage battery system shown in FIG. 1. FIG. 5 is an enlarged view of the main part of FIG. 4. FIG. FIG. 2 is a perspective view showing a storage battery system according to a different embodiment. 7 is a perspective exploded view of the storage battery system shown in FIG. 6. FIG. 8 is an exploded view of the main body of the battery case shown in FIG. 7. FIG. 7 is a sectional view taken along the line IV-IV of the storage battery system shown in FIG. 6. FIG.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the accompanying drawings. In the description of the drawings, the same reference numerals are used for the same or equivalent elements, and overlapping description will be omitted.

A storage battery system 10A according to one embodiment will be described with reference to FIGS. 1 to 5.

The storage battery system 10A includes a storage battery unit 20 and a battery case 30A that has an accommodation space therein for accommodating the storage battery unit 20. The storage battery system 10A is, for example, an outdoor stationary type, and can be placed along the outer wall of a building.

The storage battery unit 20 is configured to include a plurality of battery modules 21 and a control section 24. In this embodiment, the storage battery unit 20 includes two battery modules 22, 23 having substantially the same shape and dimensions. Specifically, the two battery modules 22 and 23 both have a substantially rectangular parallelepiped outer shape and are arranged side by side so as to face each other in the depth direction. The control unit 24 is arranged on the battery modules 22 and 23. The control unit 24 is connected to each of the battery modules 22 and 23 by wiring (not shown), and controls charging and discharging (or one of charging and discharging) of each battery module 22.

The battery case 30A defines a housing space S for housing the storage battery unit 20, and as shown in FIGS. 1 and 2, includes a main body 31, a front lid 32, and a rear lid 33. . The main body part 31, the front lid part 32, and the rear lid part 33 can all be made of metal material.

The main body portion 31 defines a top surface and side surfaces of the accommodation space S. The main body portion 31 includes a top plate portion 31a located above the storage battery unit 20, and a pair of side wall portions 31b that sandwich the storage battery unit 20 from the sides. The main body portion 31 includes a top plate portion 31a and a pair of side wall portions 31b that are continuously provided, and the top plate portion 31a and the pair of side wall portions 31b form a U-shape when viewed from the front (that is, from the front). It is located. The main body portion 31 is made of a metal plate, which is a type of plate member, and in this embodiment is made of a steel plate (more specifically, a pre-painted steel plate). By using a pre-painted steel plate as the material for the main body portion 31, significant cost reductions can be achieved. As shown in FIG. 3, the main body portion 31 according to the present embodiment is provided by bending a single steel plate in which portions that are to become the top plate portion 31a and the side wall portions 31b are continuously arranged. Flange portions F bent inward are provided at the front and rear edges of the top plate portion 31a of the main body portion 31, and at the front and rear edges and lower ends of the side wall portions 31b, respectively. It is used for screwing, riveting, etc. with the lid part 33.

The front lid section 32 defines the front surface of the accommodation space S, and is provided to close an opening 35 (front opening) defined on the front surface of the main body section 31. Like the main body part 31, the front lid part 32 can be made of a metal plate, which is a type of plate member, and can be provided by bending a single metal plate. The front lid part 32 has substantially the same shape and dimensions as the opening 35 of the main body part 31. The front lid part 32 is designed to be slightly larger than the opening 35, and covers the front edge of the main body part 31 from the outside. More specifically, an eaves portion 32a is provided on the outer edge of the front lid portion 32 and extends to overlap the front edge of the main body portion 31, and the eaves portion 32a covers the front edge of the main body portion 31 from the outside.

The rear lid portion 33 defines a back surface and a bottom surface of the storage space S. The rear lid part 33 includes a lid plate part 33a that closes an opening 36 defined on the back surface of the main body part 31, a bottom plate part 33b that covers the bottom of the main body part 31, and a front end support part 33c located at the front end of the bottom plate part 33b. It is composed of: Like the main body part 31, the rear lid part 33 can be made of a metal plate, which is a type of plate member, and can be provided by bending a single metal plate. The cover plate portion 33a has substantially the same shape and dimensions as the opening 36 of the main body portion 31. The bottom plate portion 33b closes the bottom of the main body portion 31, and supports the plurality of battery modules 21 housed in the housing space from below. The front end support portion 33c is a portion having a U-shaped cross section that extends continuously from the front end of the bottom plate portion 33b and is curved downward. The front end support part 33c supports the bottom plate part 33b so as to raise the front end thereof, creating a height difference between the front end and the rear end of the bottom plate part 33b, and tilts the bottom plate part 33b so as to descend from the front end to the rear end. At the same time, the main body portion 31 is tilted backward as a whole. Therefore, as shown in FIGS. 4 and 5, the front end support portion 33c allows the top plate portion 31a of the main body portion 31 to descend from the front end toward the rear end with respect to the horizontal plane (double-dashed line in FIG. 5). It is sloping.

As described above, the eaves portion 32a of the front lid portion 32 extends so as to overlap the front edge of the main body portion 31, and covers the front edge of the main body portion 31 from the outside. As shown in FIG. 5, a resin packing 40 is provided between the eaves 32a of the front lid 32 and the front edge of the main body 31, which overlap with each other. 31 is kept airtight and watertight.

Here, when the storage battery system 10A is installed outdoors, water droplets 50 due to rainwater or condensation may exist on the top surface of the battery case 30A, that is, on the top plate portion 31a of the main body portion 31. In some cases, water droplets may exist near the packing 40 that seals between the front lid part 32 and the main body part 31. In this case, when the inside of the battery case 30A becomes negative pressure due to a temperature difference between the inside and outside of the battery case 30A, water droplets 50 easily enter the inside.

Therefore, in the storage battery system 10A described above, the top plate part 31a of the main body part 31 of the battery case 30A is tilted downward from the front end toward the rear end with respect to the horizontal plane. Water droplets 50 are prevented from accumulating for a long time. This prevents the water droplets 50 from being present in the vicinity of the packing 40, and even when the inside of the battery case 30A becomes negative pressure, the water droplets 50 do not infiltrate into the interior through the packing 40. It's getting difficult. Therefore, high waterproofness is achieved in the storage battery system 10A.

In the unlikely event that water droplets 50 enter the interior, they will flow backwards along the lower surface of the top plate 31a due to the top plate 31a tilting downward from the front end toward the rear end with respect to the horizontal plane. A situation in which water droplets 50 fall onto the storage battery unit 20 is less likely to occur.

In addition, in the storage battery system 10A, since the bottom plate part 33b of the rear lid part 33 is inclined so as to descend from the front end toward the rear end, the battery module 21 can be inserted into the accommodation space S from the front opening 35 of the main body part 31. When storing the battery module 21, the battery module 21 can be easily sent to the rear side.

Furthermore, in the storage battery system 10A, since the cover plate part 33a of the rear cover part 33 is designed to extend in the vertical direction when installed, stability is improved.

Next, a storage battery system 10B that is different from the storage battery system 10A described above will be described with reference to FIGS. 6 to 9.

Storage battery system 10B differs from storage battery system 10A only in the form of battery case 30B, and is otherwise the same or similar to storage battery system 10A.

The battery case 30B of the storage battery system 10B includes a main body part 31 and a front lid part 32, as shown in FIGS. 6 and 7. Both the main body part 31 and the front lid part 32 can be made of a metal material.

The main body portion 31 of the battery case 30B defines the top, side, back, and bottom surfaces of the housing space S. The main body 31 of the battery case 30B includes a top plate 31a located above the storage battery unit 20, a pair of side walls 31b sandwiching the storage battery unit 20 from the sides, and a back surface 31c located at the rear of the storage battery unit 20. It is configured to include a bottom surface portion 31d located below the storage battery unit 20, and a front end support portion 31e located at the front end of the bottom surface portion 31d. The main body part 31 is continuously provided with a top plate part 31a, a pair of side wall parts 31b, a back part 31c, a bottom part 31d, and a front end support part 31e. The main body 31 of the battery case 30B is made of a metal plate, which is a type of plate member, and in this embodiment is made of a steel plate (more specifically, a pre-painted steel plate). As shown in FIG. 8, the main body 31 according to the present embodiment is a single sheet in which portions that are to become a top plate 31a, a side wall 31b, a back surface 31c, a bottom surface 31d, and a front end support 31e are arranged in succession. Installed by bending a steel plate. Flange portions F bent inward are provided at the front edge of the top plate portion 31a, the front edge and the lower end of the side wall portion 31b of the main body portion 31, respectively, and are fastened with screws or rivets to the front lid portion 32. Used for binding, etc.

The bottom surface portion 31d of the main body portion 31 of the battery case 30B supports the plurality of battery modules 21 housed in the housing space from below, like the bottom plate portion 33b of the rear lid portion 33 of the battery case 30A described above. The front end support portion 31e is a portion having a U-shaped cross section that extends continuously from the front end of the bottom surface portion 31d and is curved downward. The front end support part 31e supports the bottom part 31d so as to raise the front end thereof to create a height difference between the front end and the rear end of the bottom part 31d, and tilts the bottom part 31d so as to descend from the front end to the rear end. At the same time, the main body portion 31 is tilted backward as a whole. Therefore, as shown in FIG. 9, the top plate portion 31a of the main body portion 31 is tilted downward from the front end toward the rear end with respect to the horizontal plane (double-dashed line in FIG. 9) by the front end support portion 31e. ing.

The front lid section 32 of the battery case 30B defines the front surface of the housing space S, and is provided so as to close an opening 35 (front opening) defined on the front surface of the main body section 31. Like the main body part 31, the front lid part 32 can be made of a metal plate, which is a type of plate member, and can be provided by bending a single metal plate. The front lid part 32 has substantially the same shape and dimensions as the front opening 35 of the main body part 31. The front lid part 32 is designed to be slightly larger than the front opening 35, and covers the front edge of the main body part 31 from the outside. More specifically, an eaves portion 32a is provided on the outer edge of the front lid portion 32 and extends to overlap the front edge of the main body portion 31, and the eaves portion 32a covers the front edge of the main body portion 31 from the outside.

In the battery case 30B, as in the case of the battery case 30A, the eaves portion 32a of the front lid portion 32 extends to overlap the front edge of the main body portion 31, and covers the front edge of the main body portion 31 from the outside. As shown in FIG. 5, a resin packing 40 is provided between the eaves 32a of the front lid 32 and the front edge of the main body 31, which overlap with each other. 31 is kept airtight and watertight.

In the storage battery system 10B described above, the top plate 31a of the main body 31 of the battery case 30B is tilted downward from the front end toward the rear end with respect to the horizontal plane, so that water droplets 50 are formed on the top plate 31a. prevents it from accumulating for a long time. This prevents the water droplets 50 from being present in the vicinity of the packing 40, and even when the inside of the battery case 30B becomes negative pressure, the water droplets 50 do not infiltrate into the interior through the packing 40. It's getting difficult. Therefore, high waterproofness is achieved in the storage battery system 10B as well as in the storage battery system 10A.

Also, in the storage battery system 10B, like the storage battery system 10A, the bottom part 31d of the main body part 31 of the battery case 30B is inclined so as to descend from the front end toward the rear end. When housing the battery module 21 in the housing space S, the battery module 21 can be easily sent to the back side.

Furthermore, in the storage battery system 10B, since the battery case 30B has fewer parts, the number of joints between the parts can be reduced, thereby making it possible to further improve waterproofness.

Although the embodiments of the present invention have been described above, the present invention is not necessarily limited to the embodiments described above, and various changes can be made without departing from the gist thereof. For example, the number of battery modules included in a storage battery unit is not limited to two, and can be increased or decreased as appropriate.

As understood from the above description, this specification discloses the following.
[Additional note 1]
battery module;
a battery case having a housing space in which the battery module is housed;
The battery case is
a main body having a top plate located above the battery module and a pair of side walls sandwiching the battery module from the sides, and defining a front opening;
a front lid portion having an eaves portion that closes the front opening of the main body portion and covers the top plate portion from the outside;
a packing interposed between the top plate portion of the main body portion and the eaves portion of the front lid portion, and closing a gap between the top plate portion of the main body portion and the eaves portion of the front lid portion;
A storage battery system, wherein the top plate of the main body is inclined downward from the front end toward the rear end with respect to a horizontal plane.
[Additional note 2]
The storage battery system according to supplementary note 1, wherein the battery case further includes a front end support part that raises a lower front end of the main body part.
[Additional note 3]
The storage battery system according to appendix 1 or 2, wherein the top plate portion and the pair of side wall portions of the main body portion are arranged in a U-shape.
[Additional note 4]
The storage battery system according to Supplementary note 1 or 2, wherein the main body further includes a rear wall portion that closes the main body from the rear side and faces the front lid portion.
[Additional note 5]
The storage battery system according to appendix 4, wherein the rear wall portion extends in the vertical direction.
[Additional note 6]
The storage battery system according to any one of Supplementary Notes 1 to 5, wherein the main body portion is composed of a single plate member.

10A, 10B...Storage battery system, 20...Storage battery unit, 21, 22, 23...Battery module, 24...Control unit. 30A, 30B... Battery case, 31... Main body part, 31a... Top plate part, 31b... Side wall part, 32... Front lid part, 32a... Eaves part, 31e, 33c, Front end support part.

Claims (5)

battery module;
a battery case having a housing space in which the battery module is housed;
The battery case is
a main body having a top plate located above the battery module and a pair of side walls sandwiching the battery module from the sides, and defining a front opening;
a front lid portion having an eaves portion that closes the front opening of the main body portion and covers the top plate portion from the outside;
a packing interposed between the top plate portion of the main body portion and the eaves portion of the front lid portion, and closing a gap between the top plate portion of the main body portion and the eaves portion of the front lid portion;
The top plate portion of the main body portion is inclined with respect to a horizontal plane so as to descend from the front end toward the rear end,
The battery storage system , wherein the battery case further includes a front end support part that raises a lower front end of the main body part . The storage battery system according to claim 1 , wherein a top plate portion and a pair of side wall portions of the main body portion are arranged in a U-shape. The storage battery system according to claim 1 , wherein the main body further includes a rear wall portion that closes the main body from the rear side and faces the front lid portion. The storage battery system according to claim 3 , wherein the rear wall portion extends in a vertical direction. The storage battery system according to claim 1, wherein the main body portion is composed of a single plate member.

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