Fuse link for protecting battery and battery system

Abstract

The utility model provides a fuse link for protecting a battery and a battery system, which belongs to the technical field of fuse links and comprises a fuse tube, a contact knife and a fuse body. Contact knives are arranged at two ends of the fusion tube, a plurality of fuse bodies are arranged in an inner cavity of the fusion tube, and quartz sand filling bodies are filled in the inner cavity of the fusion tube. A plurality of groups of row holes are formed in the melt in the length direction, each group of row holes comprises a row of large-aperture row holes and a row of small-aperture row holes, the diameter of through holes of the large-aperture row holes is larger than that of through holes of the small-aperture row holes, and V-shaped bending parts are arranged between the large-aperture row holes and the adjacent large-aperture row holes. The fuse link provided by the utility model is suitable for system protection in the energy storage industry, when fault current passes through the fuse link, the narrow diameters of the through holes with different diameters in the fuse link can be quickly melted and instantly generate electric arc, and the electric arc is cooled by the solidified quartz sand filling body to be extinguished and cut off a fault circuit, so that reliable protection is provided for related circuits and components.

Description

Technical Field

[0001] The utility model belongs to the technical field of fuses, and in particular relates to a fuse for protecting batteries and battery systems. Background Art

[0002] With growing global concern for environmental protection and climate change, renewable energy sources such as solar, wind, and hydropower are rapidly developing. However, the volatility and intermittency of renewable energy make it challenging to maintain a stable supply. Energy storage technology can address this shortcoming, improving energy efficiency, supply, and security.

[0003] Low-voltage fuses, as protective components, have attracted significant market attention. They can be categorized according to their specific application: standard low-voltage fuses, fuses for semiconductor equipment protection, fuses for solar photovoltaic systems, and fuses for battery and battery system protection. Battery and battery system protection fuses play a crucial role in energy storage systems. Characterized by their suitability for DC environments, they are primarily used in energy storage and inverter systems to protect circuits and equipment from adverse conditions such as overcurrent, short circuits, overcharging, overdischarging, and overload.

[0004] Common low-voltage fuses are mainly designed for AC systems. However, with the continuous updating of application requirements, the use of DC systems has gradually increased. In particular, with the rise of the energy storage industry, more stringent fuses are needed to protect DC systems. However, this type of voltage fuse is usually replaced by AC fuses, so a dedicated DC fuse is needed to protect this type of application environment. At the same time, the fuse tube used in common fuses is an ordinary ceramic tube, which not only has poor high temperature resistance and anti-expansion performance, but is also not aesthetically pleasing. Importantly, in the existing low-voltage fuse products of DC1000V to DC1500V, the breaking capacity is still mainly 50kA to 100kA, and the minimum breaking capacity is at least 10 times In. With the rise of the energy storage industry, the original breaking capacity range can no longer meet the needs of the industry. Utility Model Content

[0005] The problem to be solved by the utility model is to provide a fuse for protecting a battery and a battery system.

[0006] To solve the above technical problems, the technical solution adopted by the present invention is: a fuse for protecting batteries and battery systems, comprising a fuse tube, a contact knife and a fuse, wherein contact knives are installed at both ends of the fuse tube, a plurality of pieces of fuse are arranged in the inner cavity of the fuse tube, and the melt is located between the two contact knives. The inner cavity of the fuse tube is filled with quartz sand filler, and the melt is provided with a plurality of groups of arrayed holes along the length direction, each row of the holes comprises a plurality of arrayed through holes, and a narrow diameter is provided between adjacent through holes. Each group of the holes comprises a row of large-aperture holes and a row of small-aperture holes, the diameter of the through holes of the large-aperture holes is larger than the through holes of the small-aperture holes, and a V-shaped bend is provided between the large-aperture holes and the adjacent large-aperture holes.

[0007] Furthermore, the narrow diameter widths between the through holes in the large-diameter hole array are the same, and the narrow diameter widths between the through holes in the small-diameter hole array are the same.

[0008] Furthermore, cover plates are fixed at both ends of the melting tube, and the cover plates are stamped and connected to the melting tube via fasteners.

[0009] Furthermore, a flat plate adapted to the inner cavity of the melting tube is provided on the inner side of the contact knife; the contact knife is fixed to both ends of the melting tube by assembling with the cover plate.

[0010] Furthermore, the inner surface of the flat plate of the touch knife is provided with a plurality of positioning blocks symmetrically arranged with the center line, and the two ends of the melt are provided with connecting parts bent in the same direction. The connecting parts are aligned with the positioning blocks and welded on the touch knife, so that the melt is arranged in the inner cavity of the melt tube parallel to the axis of the melt tube.

[0011] Furthermore, the utility model also includes a striker, which is installed outside the melting tube and connected to the fuse indicator arranged in the indicating hole of the melting tube.

[0012] Furthermore, both ends of the striker are fixed to the cover plate of the melting tube through connection points on the cover plate.

[0013] Furthermore, the melting tube is made of alumina ceramics, which can improve the performance of the fuse.

[0014] Furthermore, the melt material is 99.9 pure silver or a copper-silver composite material.

[0015] Furthermore, the quartz sand filling body is formed by heating and solidifying quartz sand with a curing agent, which can improve the breaking capacity of the fuse.

[0016] Due to the adoption of the above technical solution, the utility model has the following beneficial effects:

[0017] The fuse link of the utility model is suitable for system protection in the energy storage industry. When a fault current passes through the fuse link, the narrow diameters of the through holes of different diameters in the fuse link will melt rapidly, generating an arc instantly. The arc will quickly separate and be extinguished by cooling the solidified quartz sand filling body, thus cutting off the fault circuit and providing reliable protection for related circuits and components.

[0018] This new fuse is designed specifically for DC systems, with the interior of the fuse tube tightly packed with quartz sand. Each fuse is crafted from 99.9 pure silver or copper-silver composite tape, with large and small apertures drilled into the fuse. The fuse is then bent into a V-shape before being loaded into the fuse tube. This not only improves electrical performance, increasing voltage and current ratings, but also enhances heat dissipation. This, combined with the overall fuse tube structure, effectively reduces temperature rise during operation.

[0019] It can be seen that the present invention improves electrical and thermal performance, increases the range of segmentation capability, and also improves operating temperature rise and heat dissipation capability. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be described in detail below with reference to the accompanying drawings and in combination with examples. The advantages and implementation methods of the present invention will become more apparent. The contents shown in the accompanying drawings are only used to illustrate the present invention and do not constitute any limitation to the present invention. In the accompanying drawings:

[0021] Figure 1 It is a structural diagram of the present utility model.

[0022] Figure 2 It is a structural schematic diagram of the melt of the utility model.

[0023] Figure 3 It is a partially enlarged schematic diagram of the melt of the utility model.

[0024] Figure 4 This is a schematic diagram of the installation state of the melt of the utility model.

[0025] In the picture:

[0026] 1. Melting tube; 2. Contact knife; 3. Melt; 4. Quartz sand filler; 5. Impactor; 6. Cover plate; 7. Large-diameter hole arrangement; 8. Small-diameter hole arrangement; 9. V-shaped bending part; 10. Connecting part. DETAILED DESCRIPTION

[0027] like Figures 1 to 4As shown, the present invention discloses a fuse for protecting batteries and battery systems, comprising a fuse tube 1, a contact blade 2, a melt 3, a quartz sand filler 4, a striker 5, and a cover plate 6. Contact blades 2 are mounted at both ends of the fuse tube 1. A flat plate adapted to the inner cavity of the fuse tube 1 is disposed inside the contact blades 2. Several pieces of melt 3 are disposed within the inner cavity of the fuse tube 1, positioned between the two contact blades 2. The space between the melt 3 in the inner cavity of the fuse tube 1 is filled with quartz sand filler 4. The striker 5 is mounted on the outside of the fuse tube 1 and connected to a blown fuse indicator disposed in the indicator hole of the fuse tube. Cover plates 6 are fixed to both ends of the fuse tube 1. The cover plates 6 are stamped and connected to the fuse tube 1 via fasteners. The contact blades 2 are assembled with the cover plates 6 and fixed to both ends of the fuse tube 1.

[0028] The fuse tube 1 is made of high-strength alumina ceramic, which improves fuse performance. The fuse element 3 is made of 99.9 pure silver or copper-silver composite strip. The quartz sand filler 4 is formed by heating and solidifying high-purity quartz sand with a curing agent, which improves the fuse's breaking capacity, specifically at high voltages.

[0029] Among them, the inner surface of the flat plate of the touch knife 2 is provided with a plurality of positioning blocks symmetrically arranged with the center line, and the two ends of the melt 3 are provided with connecting parts 10 bent in the same direction. The connecting parts 10 are aligned with the positioning blocks and welded on the touch knife 2, so that the melt 3 is arranged in the inner cavity of the melt tube 1 parallel to the axis of the melt tube 1.

[0030] The two ends of the striker 5 are fixed on the cover plate 6 of the melting tube 1 through connection points on the cover plate 6 .

[0031] The melt 3 is provided with a plurality of array-arranged rows of holes along the length direction, each row of holes includes a plurality of array-arranged through holes, and a narrow diameter is provided between adjacent through holes.

[0032] Among them, each group of holes includes a row of large-aperture holes 7 and a row of small-aperture holes 8. The diameter of the through holes of the large-aperture holes 7 is larger than the through holes of the small-aperture holes 8. The narrow diameter width between the through holes of the large-aperture holes 7 is L1, and the narrow diameter width between the through holes of the small-aperture holes 8 is L2.

[0033] A V-shaped bending portion 9 is provided between the large-diameter row of holes 7 and the adjacent large-diameter row of holes 7 .

[0034] Under direct current conditions, the breaking and current limiting capability is limited. By arranging large-aperture rows of holes 7 and small-aperture rows of holes 8, the current is concentrated on the narrow diameters of the through holes of the large-aperture rows of holes 7 and the through holes of the small-aperture rows of holes 8. When a short-circuit current occurs in the system, the short-circuit current can be quickly cut off, and the breaking and current limiting performance is good. When a large short-circuit current passes through the fuse 3, the current first passes through the narrow diameter between the through holes of the small-aperture rows of holes 8, and then passes through the narrow diameter between the through holes of the large-aperture rows of holes 7, until the narrow diameter between the through holes of the large-aperture rows of holes 7 quickly disconnects the circuit and quickly extinguishes the arc; however, when a low-magnitude short-circuit current passes through the fuse 3, the narrow diameter of the through holes of the large-aperture rows of holes 7 can quickly disconnect the fuse 3 and cut off the current; at the same time, due to the high-voltage and high-current operating environment, the external dimensions of the fuse 3 are widened and lengthened to a certain extent, and a V-shaped bend 9 is added between the two rows of large-aperture rows of holes 7 in the fuse 3, which not only increases the elasticity of the fuse 3 itself but also plays a role in heat dissipation during operation.

[0035] Unlike AC environment, DC environment has no zero crossing point. Therefore, a single evenly distributed through-hole is difficult to ensure the reliable melting of the fuse link, and may even cause the fuse link to explode. Therefore, the hole positions are unevenly distributed and the through-hole sizes are not uniform. Their role is to ensure the reliable melting of the fuse link, especially in terms of minimum breaking capacity.

[0036] The utility model can be used in a DC 1500V energy storage system. When the utility model is used, the breaking capacity is as large as 250kA and as small as 8 times In. The breaking characteristics are stable and can fully meet the application occasions of energy storage equipment.

[0037] The above embodiments of the present invention are described in detail, but the above contents are only preferred embodiments of the present invention and should not be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the present invention.

Claims

1. A fuse for protecting batteries and battery systems, characterized by: It includes a melting tube, a feeler knife and a melt. The feeler knives are installed at both ends of the melting tube. Several pieces of melt are arranged in the inner cavity of the melting tube. The melt is located between the two feelers. The inner cavity of the melting tube is filled with quartz sand filler. The melt is provided with several groups of rows of holes along the length direction. Each row of the holes includes several through holes, and a narrow diameter is provided between adjacent through holes.

2. The battery and battery system protection fuse according to claim 1, characterized in that: Each group of holes includes a row of large-diameter holes and a row of small-diameter holes. The diameter of the through holes of the large-diameter holes is larger than that of the small-diameter holes. A V-shaped bending portion is provided between the large-diameter holes and adjacent large-diameter holes.

3. The battery and battery system protection fuse according to claim 2, characterized in that: The narrow diameter widths between the through holes in the large-diameter array of holes are the same, and the narrow diameter widths between the through holes in the small-diameter array of holes are the same.

4. The fuse for protecting batteries and battery systems according to claim 1, wherein: Cover plates are fixed at both ends of the melting tube, and the cover plates are connected to the melting tube.

5. The fuse for protecting a battery and a battery system according to claim 4, characterized in that: A flat plate adapted to the inner cavity of the melting tube is provided on the inner side of the contact knife; the contact knife is fixed to both ends of the melting tube by assembling with the cover plate.

6. The fuse for protecting a battery and a battery system according to claim 5, characterized in that: The inner surface of the flat plate of the touch knife is provided with a plurality of positioning blocks symmetrically arranged with respect to the center line, and both ends of the melt are provided with connecting parts bent in the same direction. The connecting parts are aligned with the positioning blocks and welded to the touch knife, so that the melt is arranged in the inner cavity of the melt tube in parallel with the axis of the melt tube.

7. The fuse for protecting a battery and a battery system according to claim 4, characterized in that: The invention also includes a striker, which is installed on the outside of the melting tube and connected to the fuse indicator arranged in the indicator hole of the melting tube.

8. The fuse for protecting a battery and a battery system according to claim 7, characterized in that: The two ends of the striker are fixed on the cover plate of the melting tube through connection points on the cover plate.

9. The fuse for protecting batteries and battery systems according to claim 1, wherein: The melting tube is made of alumina ceramics.

10. The fuse for protecting a battery and a battery system according to claim 1, wherein: The melt material is 99.9 pure silver or a copper-silver composite material.

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