Grid-connected and off-grid switching device and energy storage system

Abstract

The utility model relates to the technical field of power electronic converters, and discloses a grid-connected and off-grid switching device and an energy storage system. The mounting plate is arranged in the mounting cavity; the conducting bar is detachably connected with the mounting plate, the conducting bar is provided with a plurality of connecting platforms, the distance between the connecting platforms and the mounting plate is different, and the connecting platforms are suitable for being fixedly connected with different cables correspondingly. According to the grid-connected and off-grid switching device, the conducting bars are arranged, so that cables in the grid-connected and off-grid switching device are collected and arranged, lines are clear, maintenance and replacement of the cables are facilitated, further, the conducting bars are arranged to be provided with connecting platforms with different heights, the cables are fixed in a layered mode, the height space is fully utilized, and the working efficiency is improved. Cables arranged on the same layer are prevented from being crowded, space is fully utilized, and lines of the cables are clearer.

Description

Technical Field

[0001] The utility model relates to the technical field of power electronic converters, in particular to an on-grid and off-grid switching device and an energy storage system. Background Art

[0002] In recent years, due to the global energy crisis and geopolitical conflicts, the energy storage industry has developed rapidly. With the popularization of home storage, industrial and commercial energy storage has also gradually developed. Pure grid-connected energy storage can no longer meet the needs of industry and commerce. Therefore, the introduction of energy storage systems with on-grid and off-grid switching functions and UPS-level on-grid and off-grid switching processes has broad market prospects. The internal layout of the on-grid and off-grid switching devices on the market is complex, and the cables of electrical components are distributed in a messy manner, which makes it difficult to maintain and replace them later. Utility Model Content

[0003] In view of this, the utility model provides an on-grid and off-grid switching device to solve the problem that the internal structure of the existing on-grid and off-grid switching device is complex and is not conducive to the maintenance and replacement of cables inside the on-grid and off-grid switching device.

[0004] In the first aspect, the utility model provides an on-grid and off-grid switching device, comprising: a shell having an installation cavity; a mounting plate arranged in the installation cavity; a conductive bar detachably connected to the mounting plate, the conductive bar having a plurality of connection platforms at different heights from the mounting plate, and the plurality of connection platforms are suitable for corresponding to different cable fixed connections.

[0005] Beneficial effect: By setting up a conductive bus, the cables inside the on-grid and off-grid switching device can be organized and sorted, making the lines clear and convenient for cable maintenance and replacement. Furthermore, the conductive bus is provided with connection platforms of different heights, so that multiple cables can be fixed in layers, making full use of the height space, avoiding crowding of cables on the same layer, making full use of the space, and making the cable lines clearer.

[0006] In an optional implementation, the conductive bar further includes a connecting plate, and a plurality of the connecting plates are provided, and the plurality of connecting plates connect two adjacent connecting platforms.

[0007] In an optional embodiment, the housing includes a box body and a cover body, the box body is a hollow structure, the cover body is arranged at an opening of the box body, and the box body and the cover body enclose the installation cavity.

[0008] In an optional embodiment, a plurality of threaded holes are formed on one side of the box body facing the cover body, the cover body is formed with a through hole, and the on-grid and off-grid switching device further comprises a fastener, which is inserted into the through hole and the threaded hole at the same time to fix the box body and the cover body in connection.

[0009] Beneficial effect: The box body and the cover body are fixedly connected by arranging fasteners, thereby strengthening the tightness of the connection between the cover body and the box body and improving the waterproof performance.

[0010] In an optional embodiment, the on-grid and off-grid switching device further comprises a waterproof strip, which is arranged along the circumference of the opening of the box body, and the waterproof strip is arranged corresponding to the connection between the box body and the cover body.

[0011] Beneficial effect: By providing the waterproof strip, the waterproof performance of the box is enhanced, thus preventing the internal electrical components from being damaged.

[0012] In an optional implementation, the on-grid and off-grid switching device further comprises a surface sticker, which is disposed on the housing and has a plurality of indicator lights disposed on the surface sticker to display various status signals of the on-grid and off-grid switching device.

[0013] In an optional implementation, the grid-connected and off-grid switching device further includes a current transformer, and a plurality of the current transformers are provided, and the plurality of the current transformers are detachably connected to the mounting plate.

[0014] In an optional implementation, the on-grid and off-grid switching device further comprises a transformer fixing base, and the transformer fixing base is detachably connected to both the mounting plate and the current transformer.

[0015] Beneficial effect: The current transformer is fixed on the mounting plate by arranging the current transformer fixing seat, thereby enhancing the stability of the current transformer and avoiding adverse effects caused by shaking of the current transformer.

[0016] In an optional embodiment, the transformer fixing base includes a first plate body, a second plate body, a third plate body and a fourth plate body, the first plate body is connected to the first end of the third plate body, the second plate body is connected to the second end of the third plate body, the extension directions of the first plate body and the second plate body are opposite, and the fourth plate body is connected to the third plate body and is bent corresponding to the third plate body to form a snap-in groove.

[0017] In a second aspect, the utility model also provides an energy storage system, including the above-mentioned on-grid and off-grid switching device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a structural schematic diagram of the on-grid and off-grid switching device of an embodiment of the utility model;

[0020] Figure 2 A schematic diagram of the connection between the back-hanging bar and the connecting member of the on-grid and off-grid switching device according to an embodiment of the utility model;

[0021] Figure 3 An exploded view of the on-grid and off-grid switching device according to an embodiment of the utility model;

[0022] Figure 4 This is a schematic diagram of the connection structure of the conductive bar, current transformer and mounting plate of the grid-connected and off-grid switching device according to an embodiment of the utility model;

[0023] Figure 5 A schematic diagram of the structure of the conductive bar of the on-grid and off-grid switching device according to an embodiment of the utility model;

[0024] Figure 6 It is a structural schematic diagram of a transformer fixing seat of the on-grid and off-grid switching device according to an embodiment of the utility model;

[0025] Figure 7 A schematic diagram of the connection structure of a current transformer and a transformer fixing seat of the grid-connected and off-grid switching device according to an embodiment of the utility model;

[0026] Figure 8 This is a schematic diagram of the connection structure of another current transformer and a transformer fixing seat of the grid-connected and off-grid switching device of an embodiment of the utility model.

[0027] Description of reference numerals:

[0028] 1. Shell; 101. Box body; 1011. Threaded hole; 1012. Back hanging bar; 1013. Connector; 102. Cover body; 1021. Through hole; 1022. Surface mount; 2. Mounting plate; 201. Silk screen; 3. Conductive bar; 301. Connection platform; 302. Connection plate; 4. Waterproof strip; 5. Current transformer; 6. Transformer fixing seat; 601. First plate body; 602. Second plate body; 603. Third plate body; 604. Fourth plate body; 7. Grounding bar; 8. Interface end; 9. Insulating column; 10. Fastener. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0030] Combine the following Figures 1 to 8 , describing an embodiment of the utility model.

[0031] According to an embodiment of the present utility model, on the one hand, as Figure 3 As shown, a grid-connected and off-grid switching device is provided, comprising a housing 1, a mounting plate 2 and a conductive bar 3. The housing 1 is provided with a mounting cavity. The mounting plate 2 is arranged in the mounting cavity. The conductive bar 3 is detachably connected to the mounting plate 2, and the conductive bar 3 has a plurality of connection platforms 301 at different heights from the mounting plate 2, and the plurality of connection platforms 301 are suitable for corresponding to different cable fixed connections.

[0032] By providing the conductive bar 3, the cables inside the on-grid and off-grid switching device are organized and sorted, so that the lines are clear and convenient for cable maintenance and replacement. Furthermore, the conductive bar 3 is provided with connection platforms 301 with different heights, so that multiple cables can be fixed in layers, making full use of the height space, avoiding crowding of cables arranged on the same layer, making full use of the space, and making the cable lines clearer.

[0033] Specifically, in this embodiment, Figure 1 and Figure 2 As shown, the on-grid and off-grid switching device has four ports. The on-grid and off-grid switching device not only supports on-grid and off-grid switching of the inverter, but also can supply power to loads and engines, etc. That is, the four ports of the on-grid and off-grid switching device are respectively an INVERTER interface, a BACKUP LOAD interface, a GENERATOR interface and a GRID interface. The INVERTER interface is used to connect the inverter, the BACKUP LOAD interface is used to connect the load, the GENERATOR interface is used to connect the generator and large load, and the GRID interface is used to connect the grid.

[0034] Specifically, the generator and large load supported by the on-grid and off-grid switching device may be a heat pump or a high-power motor.

[0035] Specifically, Figure 4 As shown, the position of the mounting plate 2 corresponding to the conductive bar 3 is printed with a silk screen 201. By providing the silk screen 201, it is clear and understandable when the cable is installed and fixed, which facilitates the installation of the cable and avoids the problem of wrong cable connection.

[0036] Specifically, in this embodiment, Figure 3 and Figure 4 As shown, four conductive bars 3 are provided, and the four conductive bars 3 are arranged in parallel on one side of the mounting plate 2 to facilitate the arrangement of cables.

[0037] Specifically, in this embodiment, Figure 5 As shown, each conductive bar 3 has four connection platforms 301, and the four connection platforms 301 have different heights, which fully utilizes the height space and avoids crowding of cables on the same layer, greatly saving space. At the same time, multiple incoming lines are fixed in layers, which can make the lines clearer.

[0038] Specifically, Figure 3 and Figure 4 As shown, a grounding bar 7 is also provided on the mounting plate 2, and four grounding cables are connected by one grounding bar 7, so as to avoid multiple cables being connected separately and occupying space.

[0039] Specifically, Figure 4 As shown, the conductive bar 3 is connected to the mounting plate 2 via the insulating column 9. The insulating column 9 can effectively prevent the current from flowing into the mounting plate 2, thereby avoiding the risk of electric shock.

[0040] In one embodiment, Figure 5 As shown, the conductive bar 3 further includes a connecting plate 302 , and a plurality of connecting plates 302 are provided, and the plurality of connecting plates 302 connect two adjacent connecting platforms 301 .

[0041] It is worth mentioning that please refer to Figure 5 The two ends of the connecting plate 302 are connected to the corresponding two connecting platforms 301 through an arc transition.

[0042] In one embodiment, Figure 1 and Figure 2 As shown, the housing 1 includes a box body 101 and a cover body 102. The box body 101 is a hollow structure. The cover body 102 is arranged to cover the opening of the box body 101. The box body 101 and the cover body 102 enclose a mounting cavity.

[0043] Specifically, Figure 2 As shown, a back hanging bar 1012 and a connecting piece 1013 are provided on one side of the box body 101 away from the cover body 102. The back hanging bar 1012 is welded to the box body 101, one end of the connecting piece 1013 is fixedly connected to a predetermined installation position, and the other end of the connecting piece 1013 is connected to the outer shell 1. The back hanging bar 1012 and the connecting piece 1013 are snap-connected. Through the cooperation of the back hanging bar 1012 and the connecting piece 1013, the fixation of the on-grid and off-grid switching device is more stable, firm and more beautiful.

[0044] In one embodiment, Figure 3As shown, a plurality of threaded holes 1011 are provided on one side of the box body 101 facing the cover body 102, a through hole 1021 is provided on the cover body 102, and the off-grid switching device further comprises a fastener 10, which is inserted into the through hole 1021 and the threaded hole 1011 at the same time to fix the box body 101 and the cover body 102. The box body 101 and the cover body 102 are fixedly connected by providing the fastener 10, thereby strengthening the connection tightness between the cover body 102 and the box body 101 and improving the waterproof performance.

[0045] Specifically, in this embodiment, the fastener 10 is a compression riveted stud, and the cover 102 is crimped to the box 101 through the compression riveted stud, thereby strengthening the locking strength of the cover 102 and the box 101, thereby improving the waterproof performance.

[0046] In one embodiment, Figure 3 As shown, the on-grid switching device further includes a waterproof strip 4, which is arranged along the circumference of the opening of the box body 101, and the waterproof strip 4 is arranged corresponding to the connection between the box body 101 and the cover body 102. By arranging the waterproof strip 4, the waterproof performance of the box body 101 is enhanced to prevent damage to the internal electrical components.

[0047] Specifically, the waterproof strip 4 is embedded around the opening of the box 101, and the threaded hole 1011 is arranged on the outside of the waterproof strip 4 close to the edge of the box 101 to avoid poor waterproof performance due to welding scars and processing errors.

[0048] In one embodiment, Figure 1 and Figure 3 As shown, the on-grid and off-grid switching device further comprises a surface sticker 1022 , which is arranged on the housing 1 , and a plurality of indicator lights are arranged on the surface sticker 1022 to display various status signals of the on-grid and off-grid switching device.

[0049] Specifically, in this embodiment, Figure 3 As shown, three indicator lights are provided on the surface sticker 1022, which respectively display the on-grid and off-grid status, the power switch status and the fault status, clearly and comprehensively showing the functional status of the on-grid and off-grid switching device.

[0050] In one embodiment, the grid-connected and off-grid switching device further includes a current transformer 5 , and a plurality of current transformers 5 are provided. The plurality of current transformers 5 are detachably connected to the mounting plate 2 .

[0051] In one embodiment, the on-grid and off-grid switching device further includes a transformer fixing base 6, which is detachably connected to both the mounting plate 2 and the current transformer 5. The current transformer 5 is fixed to the mounting plate 2 by providing the transformer fixing base 6, thereby enhancing the stability of the current transformer 5 and preventing the current transformer 5 from shaking and causing adverse effects.

[0052] In one embodiment, Figure 6 As shown, the transformer fixing base 6 includes a first plate body 601, a second plate body 602, a third plate body 603 and a fourth plate body 604, the first plate body 601 is connected to the first end of the third plate body 603, the second plate body 602 is connected to the second end of the third plate body 603, the extension directions of the first plate body 601 and the second plate body 602 are opposite, and the fourth plate body 604 is connected to the third plate body 603 and is bent corresponding to the third plate body 603 to form a snap-in groove.

[0053] Specifically, Figure 7 and Figure 8 As shown, the current transformer 5 has two different specifications, and the transformer fixing seat 6 can adapt to the current transformers 5 of the two different specifications and be fixed on the mounting plate 2.

[0054] Specifically, Figure 4 As shown, a current transformer 5 is fixed by two transformer fixing bases 6. First, one transformer fixing base 6 is inserted into the mounting plate 2 for fixing, then the current transformer 5 is inserted, and finally the other transformer fixing base 6 is inserted to fix the current transformer 5 stably and securely.

[0055] Specifically, Figure 7 and Figure 8 As shown, the third plate 603 is used to place the current transformer 5, the clamping groove formed by the fourth plate 604 and the third plate 603 is used to clamp the current transformer 5, the first plate 601 is used to insert into the corresponding fixing groove of the mounting plate 2 to limit the left and right shaking of the transformer fixing seat 6 during installation, and the second plate 602 is used to limit the front and back shaking of the current transformer 5. The transformer fixing seat 6 is inserted into the mounting plate 2 and then locked with screws.

[0056] According to an embodiment of the present utility model, on the other hand, an energy storage system is provided, comprising the above-mentioned on-grid and off-grid switching device.

[0057] When using the on-grid and off-grid switching device of this embodiment, the INVERTER interface of the on-grid and off-grid switching device is connected to the inverter, the BACKUP LOAD interface is connected to the load, the GENERATOR interface is connected to the generator and the large load, and the GRID interface is connected to the grid. When the grid is out of power, the on-grid and off-grid switching device controls the inverter to switch to the off-grid state, and supplies power to the off-grid load through photovoltaic or battery. When the grid resumes power supply, the on-grid and off-grid switching device controls the inverter to switch back to the on-grid working state, and the public grid supplies power to the load.

[0058] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A grid-connected and off-grid switching device, characterized in that: include: The housing (1) is provided with a mounting cavity; A mounting plate (2) is arranged in the mounting cavity; The conductive bar (3) is detachably connected to the mounting plate (2), and the conductive bar (3) has a plurality of connection platforms (301) at different heights from the mounting plate (2), and the plurality of connection platforms (301) are suitable for corresponding fixed connections with different cables.

2. The on-grid and off-grid switching device according to claim 1, characterized in that: The conductive bar (3) further comprises a connecting plate (302), a plurality of the connecting plates (302) are provided, and the plurality of connecting plates (302) connect two adjacent connecting platforms (301).

3. The on-grid and off-grid switching device according to claim 1 or 2, characterized in that: The housing (1) comprises a box body (101) and a cover body (102); the box body (101) is a hollow structure; the cover body (102) is arranged to cover an opening of the box body (101); the box body (101) and the cover body (102) enclose the installation cavity.

4. The on-grid and off-grid switching device according to claim 3, characterized in that: The box body (101) is provided with a plurality of threaded holes (1011) on one side facing the cover body (102), the cover body (102) is provided with a through hole (1021), and the on-grid switching device further comprises a fastener (10), the fastener (10) being inserted into the through hole (1021) and the threaded hole (1011) at the same time so as to fix the box body (101) and the cover body (102) in connection.

5. The on-grid and off-grid switching device according to claim 3, characterized in that: The on-grid and off-grid switching device further comprises a waterproof strip (4), wherein the waterproof strip (4) is arranged along the circumference of the opening of the box body (101), and the waterproof strip (4) is arranged corresponding to the connection between the box body (101) and the cover body (102).

6. The on-grid and off-grid switching device according to claim 1 or 2, characterized in that: The on-grid and off-grid switching device further comprises a surface sticker (1022), wherein the surface sticker (1022) is arranged on the housing (1), and a plurality of indicator lights are arranged on the surface sticker (1022) to display various status signals of the on-grid and off-grid switching device.

7. The on-grid and off-grid switching device according to claim 1 or 2, characterized in that: The on-grid and off-grid switching device further comprises a current transformer (5), a plurality of the current transformers (5) are provided, and the plurality of the current transformers (5) are detachably connected to the mounting plate (2).

8. The on-grid and off-grid switching device according to claim 7, characterized in that: The on-grid and off-grid switching device also includes a transformer fixing seat (6), and the transformer fixing seat (6) is detachably connected to the mounting plate (2) and the current transformer (5).

9. The on-grid and off-grid switching device according to claim 8, characterized in that: The transformer fixing seat (6) includes a first plate body (601), a second plate body (602), a third plate body (603) and a fourth plate body (604), wherein the first plate body (601) is connected to a first end of the third plate body (603), the second plate body (602) is connected to a second end of the third plate body (603), the first plate body (601) and the second plate body (602) have opposite extension directions, and the fourth plate body (604) is connected to the third plate body (603) and is bent corresponding to the third plate body (603) to form a snap-in groove.

10. An energy storage system, characterized in that: include: The on-grid and off-grid switching device according to any one of claims 1 to 9.

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