Parallel cluster confluence box and energy storage system comprising same

Abstract

The utility model discloses a cluster confluence box and an energy storage system comprising the same, the cluster confluence box comprises a rear shell, a side-mounted hanger and a front cover plate, the front cover plate is arranged in front of the rear shell, a confluence cavity groove is formed by a cavity groove enclosed by the rear shell, the groove edges of the left and right sides of the confluence cavity groove are provided with rear shell hangers extending outwards, and the side-mounted hanger is arranged on the front cover plate. Two sets of confluence copper bars are supported and installed in the confluence cavity groove through insulation columns, each set of confluence copper bars is provided with a first screw and a second screw which are used for being connected with the output terminal and the input terminal in a locking mode respectively, a plurality of wire passing holes are formed in the shell wall of the top of the rear shell, and insulation paper is arranged on the inner wall of the confluence cavity groove on the rear sides of the confluence copper bars in a pressing mode; one side of the strip frame is connected with a U-shaped frame, and the U-shaped frame is detachably installed on the rear shell hanging lug. The cluster convergence box has the beneficial effects that the cluster convergence box has strong flexibility, compatibility and matching performance, has multi-point installation capability, and can meet various complex installation scenes and the like.

Description

Technical Field

[0001] This utility model relates to the field of new energy technology, and in particular to a clustered combiner box and an energy storage system containing it. Background Technology

[0002] In photovoltaic (PV) power generation systems, combiner boxes ensure the orderly connection and convergence of PV strings. While they possess high protection levels and are equipped with numerous internal protective devices, this configuration is clearly unsuitable for indoor products in the energy storage field. For example, the protection level, device configuration, and installation scenarios may be incompatible. Furthermore, energy storage systems involve complex battery clustering scenarios. Different customers have different installation environments, varying numbers of battery clusters, and different combiner box requirements. This necessitates combiner boxes capable of accommodating different capacities and installation locations, placing new demands on combiner box installation compatibility design, structural design, safety and protection requirements, and cost control. Utility Model Content

[0003] The purpose of this invention is to provide a clustered combiner box and an energy storage system containing it in order to solve the above problems.

[0004] This utility model achieves the above objectives through the following technical solutions:

[0005] First, this utility model proposes a clustered junction box, including a rear housing, a side mounting bracket, and a front cover plate. The front cover plate is located in front of the rear housing. The cavity formed by the rear housing forms a junction cavity. The left and right sides of the junction cavity have outwardly extending rear housing mounting ears. Two sets of busbars are installed in the junction cavity through insulating pillars. Each set of busbars has a first screw and a second screw. The first screw is used to lock the output terminal, and the second screw is used to lock the input terminal. The top shell wall of the rear housing has several wire holes. Insulating paper is pressed on the inner wall of the junction cavity behind the busbars. The side mounting bracket includes a strip frame. A U-shaped frame is connected to one side of the strip frame. The U-shaped frame can be detachably installed onto the rear housing mounting ears.

[0006] Furthermore, the U-shaped frame is provided with a second frame fixing hole corresponding to the position of the first frame fixing hole on the rear housing lug, and the strip frame is provided with a strip frame fixing hole.

[0007] Furthermore, the busbar is provided with a first sleeve and a second sleeve, and the first screw and the second screw are respectively threaded into the first sleeve and the second sleeve. The two ends of the busbar are provided with busbar fixing holes.

[0008] Furthermore, corner ribs are provided at the corners of the manifold groove, and the front cover plate is fixed to the corner ribs by screws.

[0009] Furthermore, the rear wall of the manifold groove is provided with a back-side fixing hole, and a back-side expansion screw is provided in the back-side fixing hole.

[0010] Furthermore, a protective coil is provided along the edge of the wire hole, and a high-voltage indicator is provided on the front side of the front cover plate.

[0011] Furthermore, a terminal mounting rail is installed in the busbar cavity, the terminal mounting rail is located between the two sets of busbars, and the terminal mounting rail is provided with AC terminal blocks.

[0012] Furthermore, the second screw is one size smaller than the first screw.

[0013] Furthermore, each of the busbars is provided with a first hole sleeve and four second hole sleeves.

[0014] Secondly, this utility model proposes an energy storage system, including at least one energy storage unit. Each energy storage unit includes at least one battery pack and a rack. The battery pack is located on the rack. When there is one battery pack, the battery pack in each energy storage unit is the battery cluster of each energy storage unit. When there are multiple battery packs, the multiple battery packs in each energy storage unit are connected in series to form the battery cluster of each energy storage unit. One of the energy storage units also includes the aforementioned parallel busbar box, and the positive and negative ends of each battery cluster are connected to the corresponding busbar copper busbar.

[0015] The beneficial effects of this utility model are as follows:

[0016] The clustered combiner box described in this utility model can be fixed on the top, bottom, side or wall of any rack. It can be installed in these positions while still meeting the needs of workers for easy wiring and cabling. It has strong flexibility, compatibility and matching, so that it can meet the application in various complex installation scenarios.

[0017] Furthermore, the clustered combiner box described in this utility model has the ability to be installed at multiple points, allowing it to find the optimal installation point in harsh installation environments. It can also shorten the length of the clustered cables and reduce cable costs.

[0018] Furthermore, the energy storage system described in this utility model has a small and compact structure, which ensures that the energy storage system can be easily maintained or inspected, reduces the scope of power outages in the event of a fault, and thus improves the stability of the energy storage system. Attached Figure Description

[0019] Figure 1 This is an exploded structural diagram of a clustered combiner box according to this utility model;

[0020] Figure 2This is a structural diagram of the rear shell of a clustered combiner box according to this utility model;

[0021] Figure 3 This is a structural diagram of the busbar of a clustered busbar box according to this utility model;

[0022] Figure 4 This is a side-mounted bracket structure diagram of a clustered combiner box according to this utility model;

[0023] Figure 5 This is a side view of the energy storage system and clustered combiner box of this utility model.

[0024] Figure 6 This is another side view of the energy storage system and clustered combiner box of this utility model;

[0025] Figure 7 This is a top installation diagram of an energy storage system and a clustered combiner box according to the present invention;

[0026] Figure 8 This is a bottom installation diagram of an energy storage system and a clustered combiner box according to this utility model.

[0027] The annotations in the attached figures are explained as follows:

[0028] 1. Rear housing; 2. Side mounting bracket; 3. Front cover plate; 4. Rear housing mounting lug; 5. Insulating post; 6. Terminal mounting rail; 7. Insulating paper; 8. Busbar; 9. Corner bracing; 10. Rear expansion screw; 11. AC terminal block; 12. Cable tie plate; 13. First screw; 14. Second screw; 15. Protective coil; 16. High voltage indicator; 17. First hole sleeve; 18. Second hole sleeve; 19. Busbar fixing hole; 0. Cable guide hole; 21. Rear side mounting hole; 22. Strip frame; 23. U-shaped frame; 24. Second frame mounting hole; 25. Strip frame mounting hole; 26. Frame; 27. Combiner cavity slot; 28. First frame mounting hole; 29. ​​Parallel combiner box; 30. Battery pack; 31. High voltage box; 32. Combiner box negative input line; 33. Combiner box negative output line; 34. Combiner box positive input line; 35. Combiner box positive output line; 36. Rear slot wall. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0030] The following is combined Figures 1 to 8 The following is a further description of the clustered combiner box and the energy storage system containing it provided in this embodiment:

[0031] Specific reference Figure 1 The present invention provides a clustered junction box 29, including a rear housing 1, a side mounting bracket 2, and a front cover plate 3. The front cover plate 3 is located in front of the rear housing 1. The cavity formed by the rear housing 1 forms a junction cavity 27. The left and right sides of the junction cavity 27 are provided with outwardly extending rear housing lugs 4.

[0032] In this embodiment, the side mounting bracket 2 is provided in two sets, which can cooperate with the rear housing mounting lug 4 to facilitate side mounting.

[0033] Reference Figure 1-3 The busbar 8 is installed in the busbar cavity 27 by means of an insulating column 5. The busbar 8 is provided with a first screw 13 and a second screw 14. The top shell wall of the rear housing 1 is provided with several wire holes 20. Insulating paper 7 is pressed on the rear wall 36 of the busbar cavity 27 on the rear side of the busbar 8.

[0034] In this embodiment, there are two sets of busbars 8, and the terminal mounting rail 6 is located between the two sets of busbars 8. Each set of busbars 8 has one first screw 13 and multiple second screws 14, such as four or other numbers.

[0035] In one embodiment, each busbar 8 has a first screw 13 and a second screw 14.

[0036] Understandably, there may be multiple insulating posts 5 used to install each set of busbars 8, such as two, three, or other quantities.

[0037] Reference Figures 1-2 , Figure 4 - Figure 8 The side mounting bracket 2 includes a strip frame 22 and a U-shaped frame 23. The U-shaped frame 23 is connected to one side of the strip frame 22. The strip frame 22 is used to fix the side mounting bracket 2 to the connecting frame 26, or in other words, the side mounting bracket 2 can be fixed to the connecting frame 26 through the strip frame 22. The U-shaped frame 23 can be detachably installed onto the rear housing lug 4.

[0038] In one embodiment, the side-mounted bracket 2 is integrally formed, or the strip bracket 22 and the U-shaped bracket 23 are integrally formed.

[0039] like Figure 1 - Figure 5 As shown, embodiments of this utility model also disclose the following more optimized specific structures:

[0040] The rear housing hanger 4 is provided with a first mounting hole 28, and the U-shaped frame 23 is provided with a second mounting hole 24 corresponding to the position of the first mounting hole 28, so as to facilitate the fixed installation of the U-shaped frame 23 and the rear housing hanger 4. For example, it can be installed by screws, and the screws are passed through the second mounting hole 24 and the first mounting hole 28 to lock the U-shaped frame 23 and the rear housing hanger 4 together; the strip frame 22 is provided with a strip frame mounting hole 25.

[0041] Understandably, in one embodiment, the number of first mounting holes 28 on each rear housing lug 4 is the same as the number of second mounting holes 24 on each corresponding side mounting bracket 2, and each can have one or more; in one embodiment, there are two first mounting holes 28 on each rear housing lug 4, arranged vertically on the rear housing lug 4. Alternatively, each rear housing lug 4 is provided with two vertically arranged first mounting holes 28; and each side mounting bracket 2's U-shaped frame 23 is provided with two vertically arranged second mounting holes 24.

[0042] The busbar 8 is provided with a first hole sleeve 17 and a second hole sleeve 18. The first screw 13 and the second screw 14 are respectively threaded into the first hole sleeve 17 and the second hole sleeve 18. The two ends of the busbar 8 are provided with busbar fixing holes 19 to facilitate screw installation onto the insulating post 5.

[0043] Understandably, the first screw 13 matches the shape of the first socket 17, and the second screw 14 matches the shape of the second socket 18. In one embodiment, the size of the second screw 14 is one size smaller than that of the first screw 13. For example, the first screw 13 is an M8 screw, and the second screw 14 is an M6 screw. Correspondingly, the first socket 17 is an M8 socket, the second socket 18 is an M6 socket, and so on.

[0044] In one embodiment, each busbar 8 has one first hole sleeve 17 and four second hole sleeves 18, and correspondingly, one first screw 13 and four second screws 14.

[0045] For ease of explanation, the cluster junction box is simply referred to as the junction box.

[0046] In one embodiment, such as Figure 1 , Figure 6As shown, one set of busbars 8 is used to connect to the negative terminal of the energy storage system. A first screw 13 on one busbar is used to lock one end of the negative output line 33 of the busbar box, and each second screw 14 on one busbar is used to lock one end of the corresponding negative input line 32 of the busbar box. The other end of each negative input line 32 of the busbar box is connected to the negative terminal of its corresponding battery cluster. Each battery cluster consists of multiple battery packs 30 connected in series. Another set of busbars 8 is used to connect to the positive terminal of the energy storage system. A first screw 13 on one busbar is used to lock one end of the positive output line 35 of the busbar box, and each second screw 14 on one busbar is used to lock one end of the corresponding positive input line 34 of the busbar box. The other end of each positive input line 34 of the busbar box is connected to the positive terminal of its corresponding battery cluster.

[0047] Understandably, the other end of the positive output line 35 and the other end of the negative output line 33 of the combiner box are connected to the DC input terminals of power converters such as inverters and converters, and are used to transmit the DC power from the energy storage system to the input terminals of the power converters to provide them with DC power.

[0048] The corner of the manifold trough 27 is provided with corner connecting ribs 9, and the front cover plate 3 is fixed to the corner connecting ribs 9 by screws.

[0049] The rear wall 36 of the manifold trough 27 is provided with a back-side fixing hole 21, and a back-side expansion screw 10 is provided in the back-side fixing hole 21 for back mounting of the manifold box 29.

[0050] Understandably, the number and position of the back-side fixing holes 21 can be set as needed. In one embodiment, there are two back-side fixing holes 21, for example, one on the left and one on the right, or one on the top and one on the bottom. In another embodiment, the two back-side fixing holes 21 are symmetrically arranged. In yet another embodiment, there are multiple back-side fixing holes 21 (two or more), and the multiple back-side fixing holes 21 are symmetrically arranged with respect to the center of the rear groove wall 36.

[0051] A protective coil 15 is provided on the edge of the cable passage hole 20 to protect the cable passing through the cable passage hole 20. A high voltage mark 16 is provided on the front side of the front cover plate 3.

[0052] In one embodiment, a terminal mounting rail 6 is installed inside the busbar slot 27, and an AC terminal block 11 is provided on the terminal mounting rail 6 for connecting the live wire and the neutral wire; a cable tie plate 12 is installed inside the busbar slot 27. In one embodiment, the cable tie plate 12 is located above the AC terminal block 11, and the cable tie plate 12 is provided with cable tie holes for passing through cable ties.

[0053] In one embodiment, the wire tying plate 12 is an integrally formed L-shaped plate with wire tying holes on its horizontal panel and mounting holes on its vertical panel. The wire tying plate 12 is fixed to the rear groove wall 36 by screws passing through the mounting holes.

[0054] like Figure 1 - Figure 8 The combined junction box shown mainly consists of a rear housing 1, a side mounting bracket 2, a front cover 3, a busbar 8, and an AC terminal block 11. The rear expansion screws 10 and the side mounting bracket 2 are detachable accessories, selectively installed according to site conditions and customer requirements. The rear expansion screws 10 are used when the combined junction box needs to be mounted on a wall or other location. The side mounting bracket 2 is used when the junction box is installed on the side of the energy storage system's rack 26. First, the side mounting bracket 2 is fixed to the rack 26, and then the rear housing mounting lugs 4 are fixed to it. The junction box is fixed on the side mounting bracket 2. Specifically, the side mounting bracket 2 is fixed to the frame 26 by passing screws through the bracket fixing holes 25 on the side mounting bracket 2 and the corresponding holes on the frame 26 and tightening the screws. Then, the first bracket fixing hole 28 on the rear housing mounting lug 4 of the junction box 29 is aligned with the second bracket fixing hole 24 on the side mounting bracket 2 by passing screws through the first bracket fixing hole 28 and the second bracket fixing hole 24 and tightening the screws, thereby fixing the rear housing mounting lug 4 to the side mounting bracket 2, thus fixing the junction box.

[0055] In one embodiment, the height of the rear housing 1 is 3U (where 1U = 44.45 mm). In another embodiment, the height of the rear housing 1 is the same as the height of the battery pack 30 of the energy storage system.

[0056] In one embodiment, there are three wire passage holes 20: the left and right sides are positive power cable passage holes and negative power cable passage holes, and the middle side is a low-voltage auxiliary power cable (live wire) passage hole and a grounding cable (neutral wire) passage hole; wherein, the positive power cable refers to the positive output line and positive input line of the combiner box, and the negative power cable refers to the negative output line and negative input line of the combiner box.

[0057] When the bundled combiner box 29 is installed on the top of the rack 26, the top exit cable is selected, with the cable pass hole 20 facing upwards. When the bundled combiner box 29 is installed on the bottom of the rack 26, the bottom exit cable is selected, with the cable pass hole 20 facing downwards. When the bundled combiner box 29 is installed on the top of the rack 26, the rear housing 1 can be located inside the top slot of the rack 26, and the rear housing mounting lug 4 is fixed to the rack 26. For example, the rear housing mounting lug 4 can be fixed by bolts passing through the first mounting hole 28 of the rear housing mounting lug 4 and the corresponding hole on the rack 26, thereby fixing the combiner box. When the bundled combiner box 29 is installed on the bottom of the rack 26, the rear housing 1 can be located inside the bottom slot of the rack 26, and the rear housing mounting lug 4 is fixed to the rack 26. For example, the rear housing mounting lug 4 can be fixed by bolts passing through the first mounting hole 28 of the rear housing mounting lug 4 and the corresponding hole on the rack 26, thereby fixing the combiner box.

[0058] Insulating post 5 is used for insulation and support of busbar 8. Insulating paper 7 is pasted under insulating post 5 to improve electrical safety factor and prevent short circuit between terminal and rear housing 1. The two sets of busbar 8 are used as common components for positive terminal busbar and negative terminal busbar respectively to meet the busbar needs of four battery clusters. First screw 13 is used to lock the output terminal (one end of positive output line 35 of busbar box and one end of negative output line 33 of busbar box). Four second screws 14 are used to lock the four input terminals (one end of positive input line 34 of busbar box and one end of negative input line 32 of busbar box). One side of terminal mounting rail 6 is used to fix AC terminal block 11, and the other side is provided with screws for connecting the busbar box to ground. Cable tie plate 12 is used to bind and fix live wire and neutral wire. For example, the cable tie head is passed through the cable tie hole on the cable tie plate 12, the cable tie is wrapped around the cable (live wire and neutral wire), and then passed back through the buckle of the cable tie head. The cable tie is tightened and the buckle is automatically locked, and the cable is firmly fixed on the cable tie plate 12.

[0059] Understandably, the second screw 14 is used to lock the input terminals. When there are N second screws 14 on each group of busbars 8, N second screws 14 can lock up to N input terminals, where N is a positive integer and N≥1.

[0060] The junction box shown above can be fixed to the top, bottom, side or wall of any rack 26. It can be installed in these locations while still meeting the needs of workers for easy wiring and cabling. It has strong flexibility, compatibility and matching, so that it can meet the application in various complex installation scenarios.

[0061] In one embodiment, the rear housing 1 and the front cover 3 are designed with an IP 20 rating, resulting in a simple structure and low cost.

[0062] An energy storage system, such as Figure 5-8As shown, the system includes at least one energy storage unit, each energy storage unit including at least one battery pack 30 and a rack 26, with the battery pack 30 located on the rack 26. When there is one battery pack 30, the battery pack 30 in each energy storage unit constitutes the battery cluster of that energy storage unit; when there are multiple battery packs 30, the multiple battery packs 30 in each energy storage unit are connected in series to form the battery cluster of that energy storage unit, that is, each energy storage unit has one battery cluster, and each battery cluster has a positive terminal and a negative terminal; one of the energy storage units also includes a parallel clustering combiner box 29, with the positive terminal and negative terminal of each battery cluster connected to a corresponding busbar in the parallel clustering combiner box 29. Specifically, the negative terminal of the battery cluster of each energy storage unit is connected to a corresponding second screw 14 on a set of busbars 8, and the positive terminal of the battery cluster of each energy storage unit is connected to a corresponding second screw 14 on another set of busbars 8. More specifically, the negative terminal of the battery cluster of each energy storage unit is connected to the corresponding second screw 14 on a set of busbars 8 via the negative input line 32 of the combiner box, and the positive terminal of the battery cluster of each energy storage unit is connected to the corresponding second screw 14 on another set of busbars 8 via the positive input line 34 of the combiner box.

[0063] In one embodiment, the number of battery packs 30 is 15, but other values ​​can be selected as needed.

[0064] In one embodiment, each energy storage unit further includes a high-voltage box 31. The positive and negative terminals of each battery cluster are connected to corresponding busbars within the cluster busbar 29. That is, the positive and negative terminals of each battery cluster are connected to the input terminals (positive and negative input terminals) of the high-voltage box 31 within its respective energy storage unit. The output terminals (positive and negative output terminals) of all high-voltage boxes 31 within all energy storage units are connected to corresponding busbars. Specifically, the positive output terminal of each high-voltage box 31 is connected to a corresponding second screw 14 on a set of busbars 8, and the negative output terminal of each high-voltage box 31 is connected to a corresponding second screw 14 on another set of busbars 8. More specifically, the negative output terminal of each high-voltage box 31 is connected to a corresponding second screw 14 on a set of busbars 8 via a negative input line of the busbar, and the positive output terminal of each high-voltage box 31 is connected to a corresponding second screw 14 on another set of busbars 8 via a positive input line of the busbar.

[0065] Understandably, the maximum number of energy storage units is consistent with the number of second screws 14 on each set of busbars 8.

[0066] This utility model's clustered combiner box has multi-point installation capability, enabling it to find the optimal installation point in harsh installation environments. It can also shorten the length of the clustered cables and reduce cable costs. In addition, its 3U size makes it compact and ensures that the energy storage system can be easily maintained or inspected, and reduces the scope of power outages in the event of a fault, thereby improving the stability of the energy storage system.

[0067] Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of this utility model as claimed.

Claims

1. A clustered combiner box, characterized in that: The device includes a rear housing, a side mounting bracket, and a front cover plate. The front cover plate is located in front of the rear housing. The cavity formed by the rear housing is a busbar cavity. The left and right sides of the busbar cavity have outwardly extending rear housing mounting ears. Two sets of busbars are installed in the busbar cavity by means of insulating pillars. Each set of busbars has a first screw and a second screw. The first screw is used to lock the output terminal, and the second screw is used to lock the input terminal. The top wall of the rear housing has several wire holes. Insulating paper is pressed on the inner wall of the busbar cavity behind the busbars. The side mounting bracket includes a strip frame. A U-shaped frame is connected to one side of the strip frame. The U-shaped frame can be detachably installed onto the rear housing mounting ears.

2. A clustered combiner box according to claim 1, characterized in that: The U-shaped frame is provided with a second frame fixing hole corresponding to the position of the first frame fixing hole on the rear housing lug, and the strip frame is provided with a strip frame fixing hole.

3. A clustered combiner box according to claim 1, characterized in that: The busbar is provided with a first sleeve and a second sleeve. The first screw and the second screw are respectively threaded into the first sleeve and the second sleeve. The busbar is provided with busbar fixing holes at both ends.

4. A clustered combiner box according to claim 1, characterized in that: The corner of the manifold is provided with corner ribs, and the front cover is fixed to the corner ribs with screws.

5. A clustered combiner box according to claim 1, characterized in that: The rear wall of the manifold is provided with a back-side fixing hole, and a back-side expansion screw is provided in the back-side fixing hole.

6. A clustered combiner box according to claim 1, characterized in that: A protective coil is provided along the edge of the wire hole, and a high-voltage indicator is provided on the front side of the front cover plate.

7. A clustered combiner box according to claim 1, characterized in that: A terminal mounting rail is installed inside the busbar cavity, and the terminal mounting rail is located between the two sets of busbars. An AC terminal block is provided on the terminal mounting rail.

8. A clustered combiner box according to claim 1, characterized in that: The second screw is one size smaller than the first screw.

9. A clustered combiner box according to claim 3, characterized in that: Each of the busbars has one first hole sleeve and four second hole sleeves.

10. An energy storage system, characterized in that: The device includes at least one energy storage unit, each energy storage unit including at least one battery pack and a rack, the battery pack being located on the rack. When there is one battery pack, the battery pack in each energy storage unit is the battery cluster of each energy storage unit; when there are multiple battery packs, the multiple battery packs in each energy storage unit are connected in series to form the battery cluster of each energy storage unit; one of the energy storage units also includes a clustered busbar as described in any one of claims 1-9, the positive and negative ends of each battery cluster being connected to the corresponding busbar.

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