High-voltage fuse and energy storage system with same

Abstract

The utility model relates to a high-voltage fuse and an energy storage system with the high-voltage fuse, and the high-voltage fuse comprises a fusion tube which comprises a square tube body and square annular end walls located at the two transverse ends of the square tube body; the plurality of melts extend in the square tube body along the transverse direction; a pair of wiring terminals, wherein each wiring terminal comprises an end cover, a sealing sheet clamped between the end cover and the corresponding square annular end wall, and a connecting part connected with the adjacent transverse end parts of the plurality of melts; wherein the shape of the cross section of the sealing sheet of each wiring terminal is designed into a square ring shape, the shape of the cross section of the corresponding connecting part is designed into a round shape, and the sealing sheet surrounds the corresponding connecting part on a plane perpendicular to the transverse direction and is concentrically arranged with the corresponding connecting part; and the end cover of each wiring terminal is allowed to be provided with a sand filling hole penetrating along the transverse direction and a sealing plug used for plugging the sand filling hole in an area between one break angle of the corresponding sealing sheet and a part, opposite to the break angle, of the corresponding connecting part.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit protection devices for electric power or electric vehicles, in particular to a high-voltage fuse and an electric vehicle with the high-voltage fuse. Background Art

[0002] Industrial energy storage systems are systems used to store electrical energy and release it when needed. They are usually used in industrial fields such as factory park energy storage, data center energy storage, and commercial complex energy storage to achieve functions such as balancing power supply and demand, improving grid stability, and providing backup power. The operating voltage of industrial energy storage systems is usually between 1000 V DC and 1500 V DC, so the battery pack, as a core component for storing and releasing electrical energy in the energy storage system, needs to be protected by a fuse that can withstand high current and high voltage.

[0003] The fault protection scheme of the energy storage system in the prior art usually adopts 6-8 small fuses with a rated voltage of 250 V DC connected in series, but multiple fuses may not be able to operate simultaneously due to individual differences when a fault current occurs, which may lead to the problem of not being able to safely and reliably disconnect the electrical circuit or even damage the system. Based on this, the energy storage system can be protected by a single high-voltage fuse with a rated voltage of 1500 V DC, but the high-voltage fuse in the prior art usually needs to be provided with a fuse tube extending in the transverse direction for a sufficient length to accommodate the desired length of the fuse and a terminal with a sufficient cross-sectional area to provide an installation area for installing the desired number of fuses, a sand filling area, and a connection area for connecting to the fuse tube. Obviously, this will cause the defect of a large volume of the high-voltage fuse.

[0004] Therefore, there is a demand in the art for a high-voltage fuse with a smaller size and higher reliability. Utility Model Content

[0005] The utility model aims to provide a high-voltage fuse which can at least solve some of the above problems.

[0006] The utility model also aims to provide an energy storage system using the improved high-voltage fuse.

[0007] According to one aspect of the utility model, a high-voltage fuse is provided, the high-voltage fuse comprising: a fuse tube, comprising a square tube body extending in a transverse direction and square ring-shaped end walls located at both transverse ends of the square tube body; a plurality of fuses extending in a transverse direction in the square tube body at intervals relative to each other; a pair of terminals, which are respectively connected to the square ring-shaped end walls at both transverse ends of the square tube body, each terminal comprising an end cap connected to the corresponding square ring-shaped end wall, a sealing sheet arranged on the transverse side of the end cap facing the square tube body to be clamped between the end cap and the corresponding square ring-shaped end wall, and a connecting portion fixed on the transverse side of the end cap facing the square tube body to be connected to the adjacent transverse ends of the plurality of fuses; wherein the cross-sectional shape of the sealing sheet of each terminal is designed to be a square ring and the cross-sectional shape of the corresponding connecting portion is designed to be a circle, the sealing sheet surrounds the corresponding connecting portion on a plane perpendicular to the transverse direction and is arranged concentrically with the corresponding connecting portion, so as to allow the end cap of each terminal to be arranged in the area between one of the folded corners of the corresponding sealing sheet and the portion of the corresponding connecting portion opposite to the folded corner, a sand filling hole penetrating in a transverse direction and a plug for sealing the sand filling hole.

[0008] Compared with the prior art, the terminal block of the high-voltage fuse in the utility model is provided with an end cover and a sealing sheet and a connecting portion located on the end cover. The end cover can clamp the sealing sheet between the end cover and the fuse tube when connected to the fuse tube to improve the sealing between the two. The sealing sheet and the connecting portion are concentrically arranged and constructed with different cross-sectional shapes. This can minimize the interval between the sealing sheet and the connecting portion while arranging a sand-filling hole between the corner of the sealing sheet and the connecting portion, which only needs to penetrate one structure of the end cover. This cleverly reduces the size of the high-voltage fuse in a plane perpendicular to the horizontal direction and is easy to manufacture.

[0009] Preferably, the corner of the sealing sheet of each terminal block is smoothly transitioned and the curvature of the corner is greater than the curvature of the corresponding connecting part, and the part of the corresponding connecting part opposite to one of the corners of the sealing sheet is concave to form an arc-shaped recess, so that the sand filling hole is arranged in the area between the corner of the sealing sheet and the arc-shaped recess of the corresponding connecting part.

[0010] Preferably, a wiring hole extending transversely through the end cover of each terminal block is provided in an area opposite to the corresponding connecting portion, and a wiring portion extending transversely toward the corresponding wiring hole and beyond the corresponding wiring hole is provided on the lateral side of the corresponding connecting portion away from the square tube body.

[0011] Preferably, the sealing sheet of each terminal block is surrounded by the corresponding end cover in a plane perpendicular to the transverse direction and is arranged concentrically and spaced apart with the corresponding end cover, and the sealing sheet is also arranged spaced apart from the corresponding connecting portion in a plane perpendicular to the transverse direction.

[0012] Preferably, a lateral side of the sealing sheet of each terminal block facing the corresponding end cover is provided with a protrusion extending toward the corresponding end cover.

[0013] Preferably, each melt includes a base extending in the transverse direction, at least four rows of narrow diameters arranged on the base and spaced apart from each other in the transverse direction, and two bending portions arranged on the base, wherein a bending portion is provided between two rows of the farthest narrow diameters in the transverse direction of the four rows of narrow diameters of each melt and the adjacent narrow diameters.

[0014] Preferably, the number of rows of narrow diameters of each melt is 8-9 rows and the spacing between adjacent narrow diameters is 8-9 mm.

[0015] Preferably, the connection portion of each terminal is arranged in a first radial direction of the corresponding connection portion on the lateral surface of the square tube body facing away from the corresponding connection portion, and the multiple fuses are arranged in a multi-row pattern on the lateral surface of the square tube body facing the corresponding connection portion, and the multi-row pattern is symmetrically arranged relative to a second radial direction perpendicular to the first radial direction.

[0016] Preferably, the multi-piece fuse is constructed as a six-row pattern symmetrical about the second radial direction on the lateral surface of the connecting portion of each terminal facing the square tube body, and the spacing between two rows of fuses adjacent to the second radial direction in the six-row pattern is constructed to allow the arrangement of connecting fasteners connecting the connecting portion to the corresponding end cover.

[0017] According to another aspect of the utility model, an energy storage system is provided, and the energy storage system includes the aforementioned high-voltage fuse.

[0018] Some of the other features and advantages of the present invention will be apparent to those skilled in the art after reading this application, and the other parts will be described in the following specific embodiments in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The embodiments of the present invention are described in detail below with reference to the accompanying drawings, wherein:

[0020] Figure 1 It is an exploded three-dimensional view of a high-voltage fuse according to the utility model;

[0021] Figure 2 It is a three-dimensional view of a pair of connection terminals and a part of the fuse of the high-voltage fuse according to the utility model;

[0022] Figure 3 It is a side view of a pair of connection terminals and a part of the fuse of the high-voltage fuse according to the utility model;

[0023] Figure 4 It is a side view of one of the wiring terminals and a part of the fuse of the high-voltage fuse according to the utility model;

[0024] Figure 5It is a three-dimensional view of a single-piece fuse of a high-voltage fuse according to the utility model.

[0025] Description of reference numerals:

[0026] 100-high voltage fuse; 10-fusible tube; 11-square tube body; 12-square ring end wall; 20-melt; 21-base; 22-narrow diameter; 23-bending portion; 30-connecting terminal; 31-end cover; 32-sealing sheet; 321-positioning protrusion; 33-connecting portion; 331-arc-shaped recess; 34-sand filling hole; 35-sealing plug; 36-connecting portion; 37-assembling fastener; 38-connecting fastener. DETAILED DESCRIPTION

[0027] Now, with reference to the accompanying drawings, a schematic scheme of the high-voltage fuse disclosed in the utility model is described in detail. Although the accompanying drawings are provided to present some embodiments of the utility model, the accompanying drawings do not have to be drawn according to the dimensions of the specific embodiments, and certain features may be enlarged, removed or partially cut to better illustrate and explain the disclosure of the utility model. Some components in the accompanying drawings can be adjusted in position according to actual needs without affecting the technical effect. The phrase "in the accompanying drawings" or similar terms appearing in the specification do not necessarily refer to all drawings or examples.

[0028] Certain directional terms used to describe the drawings below, such as "inside", "outside", "above", "below" and other directional terms, will be understood to have their normal meanings and refer to those directions involved when the drawings are normally viewed. Unless otherwise specified, the directional terms described in this specification are basically in accordance with the conventional directions understood by those skilled in the art.

[0029] The terms "first", "first", "second", "second" and the like used in the present invention do not indicate any order, quantity or importance, but are used to distinguish one component from other components.

[0030] The terms "joining", "connection" and the like as used in the present invention include both that two components are indirectly connected together by means of an intermediate layer such as an adhesive, a welding agent, etc. or an intermediate piece such as a connector, a transition piece, etc., and that two components are directly connected together without the aid of any intermediate layer such as an adhesive, a welding agent, etc. or an intermediate piece such as a connector, a transition piece, etc.

[0031] Figures 1 to 5The utility model shows a high-voltage fuse 100 suitable for an energy storage system by way of example. The high-voltage fuse 100 in this example can improve the overall sealing effect while reducing the cross-sectional area when the terminal 30 is connected to the fuse tube 10 by cleverly designing the terminal 30, thereby expanding the adaptability of the high-voltage fuse 100 and improving the reliability of the high-voltage fuse 100. As shown in the figure, the high-voltage fuse 100 may include a fuse tube 10, a plurality of fuses 20 and a pair of terminals 30.

[0032] Specifically, the melting tube 10 can be made of a ceramic material with good heat dissipation and long service life. The melting tube 10 may include a square tube body 11 extending in the transverse direction and square ring-shaped end walls 12 located at the transverse ends of the square tube body 11. Compared with the circular tube body, the square tube body 11 has a higher internal space utilization rate to facilitate the arrangement of multiple pieces of melt 20. The square ring-shaped end wall 12 can be formed by an end wall arranged at the transverse end of the square tube body 11 along a transverse opening. A pair of connecting terminals 30 are respectively connected to the square ring-shaped end walls 12 at the transverse ends of the square tube body 11 to close the transverse sides of the square tube body 11 and connect to the transverse ends of the melt 20, thereby connecting the melt 20 in the square tube body 11 to the external protected circuit. It can be understood that the "transverse" mentioned in this article is Figure 1 The length direction of the middle tube body.

[0033] The terminal block 30 may include an end cap 31, a sealing sheet 32 ​​and a connecting portion 33. The outer contour of the end cap 31 on a plane perpendicular to the transverse direction is substantially matched with the outer contour of the corresponding square annular end wall 12, so that after the end cap 31 is connected to the corresponding square annular end wall 12, the opening on the square annular end wall 12 can be covered and the overall appearance of the high-voltage fuse 100 can be kept smooth and beautiful. It can be understood that the "corresponding square annular end wall 12" mentioned here refers to the end cap 31 to which the end cap 31 is to be installed. The sealing sheet 32 ​​can be clamped between the end cap 31 and the corresponding square annular end wall 12 when the end cap 31 is connected to the corresponding square annular end wall 12, thereby improving the sealing between the two and preventing the arc extinguishing sand subsequently filled into the square tube 11 from leaking. The connecting portion 33 can be arranged on the transverse side of the corresponding end cap 31 facing the square tube 11, that is, the transverse inner side, to connect with the corresponding transverse end of the multi-piece fuse 20, and the connecting portion 33 can be connected to the external protected circuit later, so as to connect the multi-piece fuse 20 in series to the protected circuit.

[0034] The cross-sectional shape of the sealing sheet 32 ​​can be designed as a square ring, and the cross-sectional shape of the connecting portion 33 can be designed as a circle. The sealing sheet 32 ​​surrounds the connecting portion 33 on a plane perpendicular to the transverse direction and is arranged concentrically with the connecting portion 33. This can ensure that the sealing sheet 32 ​​and the connecting portion 33 are arranged as close to each other as possible based on the different cross-sectional structures of the two, and can provide a maximum spacing between the sealing sheet 32 ​​and the connecting portion 33 between one of the corners of the sealing sheet 32 ​​and the connecting portion 33, so as to allow the sand filling hole 34 to be formed by traversing the corresponding end cover 31 between the corner of the sealing sheet 32 ​​and the portion of the connecting portion 33 opposite to the corner, and the sand filling hole 34 can be blocked by the plug 35 after the sand filling operation is completed. Therefore, the high-voltage fuse 100 provided by the utility model can improve the sealing performance while reducing the overall size as much as possible.

[0035] Optionally, in the embodiment shown in the figure, the sealing sheet 32 ​​can be made of an elastic material such as aluminum 1060. Considering that the sealing sheet 32 ​​is constructed as a square ring concentric with the connecting portion 33 and in order to avoid adverse phenomena such as stress concentration, the corner of the sealing sheet 32 ​​can be designed to be a smooth transition and the curvature of the corner is greater than the curvature of the connecting portion 33. The portion of the connecting portion 33 opposite to one of the corners of the sealing sheet 32 ​​can be concave to form an arc-shaped recess 331, so that the area between the corner of the sealing sheet 32 ​​and the arc-shaped recess 331 of the connecting portion 33 on the end cover 31 is arranged with a sand-filling hole 34 spaced from both the connecting portion 33 and the sealing sheet 32. Exemplarily, the curvature of the arc-shaped recess 331 of the connecting portion 33 can be the same as the curvature of the sand-filling hole 34, so that the arc-shaped recess 331 of the connecting portion 33 is evenly spaced from the sand-filling hole 34.

[0036] Optionally, in the embodiment shown in the figure, a wiring hole that runs through the end cover 31 in the area opposite to the corresponding connecting portion 33 may be provided, and a wiring portion 36 may be provided on the lateral outer side of the corresponding connecting portion 33, that is, on the side away from the square tube body 11, and the wiring portion 36 extends outward in the lateral direction from the lateral outer side of the connecting portion 33 until passing through the wiring hole. Exemplarily, the wiring portion 36 may be designed as a knife-shaped contact knife.

[0037] Optionally, in the embodiment shown in the figure, specific reference is made to Figure 4 In a plane perpendicular to the transverse direction, the end cover 31 surrounds the sealing sheet 32 ​​and is arranged concentrically with the sealing sheet 32, while the sealing sheet 32 ​​surrounds the connecting portion 33 and is arranged concentrically with the connecting portion 33. The spacing between the sealing sheet 32, the end cover 31 and the connecting portion 33 allows the sealing sheet 32 ​​to deform during the clamping process without exceeding the end cover 31 and the square ring end wall 12.

[0038] Optionally, in the embodiment shown in the figure, specific reference is made to Figure 1The lateral outer side of the sealing sheet 32, i.e., the lateral side facing the end cover 31, may be provided with a protrusion 321 on its straight section, so that the sealing sheet 32 ​​can be abutted against the square annular end wall 12 and the sealing performance between the sealing sheet 32 ​​and the corresponding end cover 31 can be further improved.

[0039] Exemplarily, the end cap 31, the sealing sheet 32 ​​and the square ring-shaped end wall 12 are all provided with through holes extending transversely therethrough, and the through holes on the end cap 31, the sealing sheet 32 ​​and the square ring-shaped end wall 12 are connected to form an assembly hole, and the assembly fastener 37 can pass through the assembly hole and connect to the square ring-shaped end wall 12, thereby connecting the end cap 31 to the melting tube 10 and clamping the sealing sheet 32 ​​between the end cap 31 and the melting tube 10.

[0040] Optionally, in the embodiment shown in the figure, specific reference is made to Figures 2 to 5 The melt 20 may be made of a conductive material such as copper and include a substrate 21, a narrow diameter 22 and a bending portion 23. The substrate 21 extends in the transverse direction inside the square tube 11, and at least four rows of narrow diameters 22 are arranged on the substrate 21 at intervals relative to each other. Exemplarily, the narrow diameter 22 may be formed by a plurality of punching intervals in the width direction of the substrate 21. In an embodiment not shown, the narrow diameter 22 may be formed by a plurality of long waist holes in the width direction of the substrate 21. A bending portion 23 may be provided between the two most transverse narrow diameters 22 and the adjacent narrow diameters 22 in the multiple rows of narrow diameters 22, respectively, and the length of the bending portion 23 in the transverse direction is less than the spacing between the other adjacent narrow diameters 22 without the bending portion 23. Therefore, by arranging only two bending portions 23, not only the length of the melt 20 in the transverse direction can be shortened, but also the stress effect on the intermediate substrate 21 can be reduced when the melt 20 expands due to heat.

[0041] For the high-voltage fuse 100 in this embodiment, 8-9 rows of narrow diameters 22 can be arranged on the fuse 20, and the spacing between adjacent narrow diameters 22 can be 8-9 mm. Experiments have shown that the fuse 20 with the above number of rows of narrow diameters 22 and the above spacing can reduce the horizontal length of the high-voltage fuse 100 in the utility model by 30% compared with the conventional high-voltage fuse 100 with 10-11 rows of narrow diameters and a narrow diameter spacing of 14-15 mm.

[0042] Optionally, in the embodiment shown in the figure, specific reference is made to Figures 2 to 4 The multiple melts 20 are arranged in rows in the melting tube 10, and the lateral ends thereof thus form a multi-row pattern on the lateral inner side of the connecting portion 33. Figure 1 and Figure 4 As shown, the wiring portion 36 may be arranged in a first radial direction of the lateral outer surface of the corresponding connecting portion 33, that is, Figure 4It can be seen that the first radial direction where the wiring portion 36 is located extends through the minimum spacing between the connecting portion 33 and the sealing sheet 32. The multiple rows of patterns formed by the multiple pieces of melt 20 are arranged symmetrically relative to the second radial direction perpendicular to the first radial direction, that is, Figure 4 Thus, the space on the lateral inner surface of the connecting portion 33 can be fully utilized to arrange as many rows of melts 20 as possible.

[0043] For example, an even number of rows of melts 20, such as six rows of melts 20, may be arranged on the lateral inner surface of the connecting portion 33, so that the region along the second radial direction on the lateral inner surface of the connecting portion 33 is not arranged with melts 20 but is left empty, so that the connecting fastener 38 may be arranged in the second radial region of the lateral inner surface of the connecting portion 33 to fasten the connecting portion 33 and the end cover 31 together. Preferably, as Figure 3 As shown, the distance between two rows of melts 20 adjacent to the second radial direction among the six rows of melts 20 is designed to be just larger than the outer diameter of the connecting fastener 38 .

[0044] It should be understood that although this specification is described according to various embodiments, not every embodiment contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0045] The above description is only an illustrative embodiment of the present invention and is not intended to limit the scope of the present invention. Any equivalent changes, modifications and combinations made by any technician in the field without departing from the concept and principle of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A high voltage fuse (100), characterized in that: The high voltage fuse (100) comprises: A melting tube (10) comprising a square tube body (11) extending in a transverse direction and square annular end walls (12) located at both transverse ends of the square tube body (11); A plurality of melt sheets (20) extending in a transverse direction in the square tube (11) at intervals relative to each other; A pair of connecting terminals (30) connected to the square annular end walls (12) at both transverse ends of the square tube (11), each connecting terminal (30) comprising an end cover (31) connected to the corresponding square annular end wall (12), a sealing sheet (32) arranged on the transverse side of the end cover (31) facing the square tube (11) to be clamped between the end cover (31) and the corresponding square annular end wall (12), and a connecting portion (33) fixed on the transverse side of the end cover (31) facing the square tube (11) to be connected to adjacent transverse ends of the plurality of fuses (20); The cross-sectional shape of the sealing sheet (32) of each terminal block (30) is designed to be a square ring and the cross-sectional shape of the corresponding connecting portion (33) is designed to be a circle. The sealing sheet (32) surrounds the corresponding connecting portion (33) on a plane perpendicular to the transverse direction and is arranged concentrically with the corresponding connecting portion (33), so as to allow the end cover (31) of each terminal block (30) to be arranged with a sand-filling hole (34) penetrating in the transverse direction and a sealing plug (35) for sealing the sand-filling hole (34) in the area between one of the folded corners of the corresponding sealing sheet (32) and the portion of the corresponding connecting portion (33) opposite to the folded corner.

2. The high voltage fuse (100) according to claim 1, characterized in that: The corner of the sealing sheet (32) of each connecting terminal (30) is smoothly rounded and has a curvature greater than the curvature of the corresponding connecting portion (33); the portion of the corresponding connecting portion (33) opposite to one of the corners of the sealing sheet (32) is inwardly concave to form an arc-shaped recess (331), so that the sand filling hole (34) is arranged in the area between the corner of the sealing sheet (32) and the arc-shaped recess (331) of the corresponding connecting portion (33).

3. The high voltage fuse (100) according to claim 1, characterized in that: A wiring hole extending transversely through the end cover (31) of each wiring terminal (30) is provided in an area opposite to the corresponding connecting portion (33), and a wiring portion (36) extending transversely toward the corresponding wiring hole and beyond the corresponding wiring hole is provided on the transverse side of the corresponding connecting portion (33) away from the square tube (11).

4. The high voltage fuse (100) according to claim 1, characterized in that: The sealing sheet (32) of each connection terminal (30) is surrounded by the corresponding end cover (31) on a plane perpendicular to the transverse direction and is arranged concentrically and spaced apart from the corresponding end cover (31), and the sealing sheet (32) is also arranged spaced apart from the corresponding connection portion (33) on a plane perpendicular to the transverse direction.

5. The high voltage fuse (100) according to claim 1, characterized in that: A protrusion (321) extending toward the corresponding end cover (31) is provided on the lateral side of the sealing sheet (32) of each connection terminal (30) facing the corresponding end cover (31).

6. The high voltage fuse (100) according to claim 1, characterized in that: Each melt (20) comprises a substrate (21) extending in the transverse direction, at least four rows of narrow paths (22) arranged on the substrate (21) and spaced apart from each other in the transverse direction, and two bending portions (23) arranged on the substrate (21), wherein a bending portion (23) is respectively provided between two rows of the most transverse narrow paths (22) of the four rows of narrow paths (22) of each melt (20) and the adjacent narrow paths (22).

7. The high voltage fuse (100) according to claim 6, characterized in that: The number of rows of narrow paths (22) of each melt (20) is 8-9 rows and the spacing between adjacent narrow paths (22) is 8-9 mm.

8. The high voltage fuse (100) according to claim 6, characterized in that: The connection portion (36) of each connection terminal (30) is arranged in a first radial direction of the lateral surface of the corresponding connection portion (33) facing away from the square tube body (11), and the multiple pieces of fuse (20) are arranged in a multi-row pattern on the lateral surface of the corresponding connection portion (33) facing the square tube body (11), and the multi-row pattern is symmetrically arranged relative to a second radial direction perpendicular to the first radial direction.

9. The high voltage fuse (100) according to claim 8, characterized in that: The multiple pieces of fuses (20) are configured as six rows of patterns symmetrical about the second radial direction on the lateral surface of the connecting portion (33) of each terminal (30) facing the square tube (11), and the spacing between two rows of fuses (20) adjacent to the second radial direction in the six rows of patterns is configured to allow the arrangement of a connecting fastener (38) connecting the connecting portion (33) to the corresponding end cover (31).

10. An energy storage system, characterized in that: The energy storage system comprises a high-voltage fuse (100) according to any one of claims 1 to 9.

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