Fuse link for protecting battery and battery system

Abstract

The invention 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 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 rapidly melted, electric arcs are instantly generated, the electric arcs are cooled by the solidified quartz sand filling body to be extinguished, a fault circuit is cut off, and reliable protection is provided for related circuits and components.

Description

Technical Field

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

[0002] As the world pays more and more attention to environmental protection and climate change, renewable energy such as solar energy, wind energy, and hydropower are developing rapidly. However, the volatility and intermittency of renewable energy make it a problem to ensure stable supply. The application of energy storage technology can make up for this shortcoming, improve energy utilization efficiency, and improve energy supply and energy security.

[0003] At present, low-voltage fuses, as protective components, have always attracted market attention. According to different usage scenarios, they can be divided into ordinary low-voltage fuses, fuses for semiconductor equipment protection, fuses for solar photovoltaic system protection, and fuses for battery and battery system protection. Fuses for battery and battery system protection play a vital role in energy storage systems. The product feature is that they are suitable for DC environments. They are mainly used in energy storage systems and inverter systems to protect circuits and equipment from adverse conditions such as overcurrent, short circuit, overcharge, overdischarge, and overload.

[0004] Common low-voltage fuses are mainly used for AC systems, but with the continuous update of application requirements, the use of DC systems has gradually increased, especially with the rise of the energy storage industry. More stringent fuses are needed to protect DC systems, but usually this type of voltage fuse is replaced by AC fuse, so a special DC fuse is needed to protect this type of application environment. At the same time, the fuse tube used in the usual fuse is an ordinary ceramic tube, which not only has poor high temperature resistance and anti-expansion performance, but also is not beautiful enough. It is important that 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. Summary of the invention

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

[0006] In order 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 melt 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 a quartz sand filler, and the melt is provided with a plurality of groups of array-arranged rows of holes along the length direction, each row of the rows of holes comprises a plurality of array-arranged through holes, and a narrow diameter is arranged between adjacent through holes, and each group of the rows of holes comprises a row of large-aperture rows of holes and a row of small-aperture rows of holes, the diameter of the through holes of the large-aperture rows of holes is larger than that of the through holes of the small-aperture rows of holes, and a V-shaped bending portion is arranged between the large-aperture rows of holes and the adjacent large-aperture rows of 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 fusion tube, and the cover plates are stamped and connected to the fusion tube via fasteners.

[0009] Furthermore, a flat plate adapted to the inner cavity of the melting tube is arranged inside the contact knife; the contact knife is fixed to the two 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 both ends of the melt are provided with connecting parts bent in the same direction, and 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 in parallel with the axis of the melt tube.

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

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

[0013] Furthermore, the material of the fuse tube is 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 curing 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 present invention has the following beneficial effects:

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

[0018] The melt of the present invention is specially designed for DC system, and the inside of the melt tube is filled with quartz sand. Each piece of melt is made of 99.9 pure silver or copper-silver composite belt, and large-diameter holes and small-diameter holes are opened on the melt. The melt is bent into a V-shape and then loaded into the melt tube, which not only improves its electrical performance, increases the voltage and current levels, but also improves its heat dissipation performance. With the overall structure of the melt tube, the temperature rise during operation is effectively improved.

[0019] It can be seen that the present invention improves the electrical performance and thermal performance, increases the segmentation capacity range, and also improves the operating temperature rise and heat dissipation capacity. 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, and the advantages and implementation methods of the present invention will become more obvious. The contents shown in the accompanying drawings are only used to explain the present invention and do not constitute any limitation to the present invention in any sense. In the accompanying drawings:

[0021] Figure 1 It is a structural schematic diagram of the present invention.

[0022] Figure 2 It is a schematic diagram of the structure of the melt of the present invention.

[0023] Figure 3 It is a partial enlarged schematic diagram of the melt of the present invention.

[0024] Figure 4 It is a schematic diagram of the installation state of the melt of the present invention.

[0025] In the figure:

[0026] 1. Melting tube; 2. Touch knife; 3. Melt; 4. Quartz sand filling body; 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, a fuse for protecting a battery and a battery system of the present invention comprises a fuse tube 1, a contact knife 2, a melt 3, a quartz sand filling body 4, a striker 5 and a cover plate 6. Contact knives 2 are installed at both ends of the fuse tube 1. A flat plate adapted to the inner cavity of the fuse tube 1 is arranged inside the contact knife 2. Several pieces of melt 3 are arranged in the inner cavity of the fuse tube 1. The melt is located between two contact knives 2. The quartz sand filling body 4 is filled between the melt 3 in the inner cavity of the fuse tube 1. The striker 5 is installed outside the fuse tube 1 and connected to the fuse indicator arranged in the indicator hole of the fuse tube. Cover plates 6 are fixed at both ends of the fuse tube 1. The cover plates 6 are stamped and connected to the fuse tube 1 through fasteners. The contact knives 2 are fixed to both ends of the fuse tube 1 by assembling with the cover plates 6.

[0028] Among them, the melting tube 1 is made of high-strength alumina ceramics, which can improve the performance of the fuse. The melt 3 is made of 99.9 pure silver or copper-silver composite strip. The quartz sand filler 4 is formed by heating and curing high-purity quartz sand with a curing agent, which can improve the breaking capacity of the fuse, specifically, improve the breaking capacity of the fuse under high voltage.

[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 in parallel with 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 the 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-diameter holes 7 and a row of small-diameter holes 8. The diameter of the through holes of the large-diameter holes 7 is larger than the through holes of the small-diameter holes 8. The narrow diameter width between the through holes of the large-diameter holes 7 is L1, and the narrow diameter width between the through holes of the small-diameter 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 capacity is limited. By setting large-aperture row holes 7 and small-aperture row holes 8, the current is concentrated on the narrow diameters of the through holes of the large-aperture row holes 7 and the through holes of the small-aperture row holes 8. When there is a short-circuit current 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 row holes 8, and then passes through the narrow diameter between the through holes of the large-aperture row holes 7, until the narrow diameter between the through holes of the large-aperture row holes 7 quickly disconnects the circuit and quickly extinguishes the arc; but when a low-multiple short-circuit current passes through the fuse 3, the narrow diameter of the through holes of the large-aperture row holes 7 can quickly disconnect the fuse 3 and disconnect the current; at the same time, due to the use environment of high voltage and high current, the external dimensions of the fuse 3 are widened and lengthened to a certain extent, and a V-shaped bending portion 9 is added between the two rows of large-aperture row holes 7 of the fuse 3, which can not only increase the elasticity of the fuse 3 itself but also play a role in heat dissipation during operation.

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

[0036] The present invention can be used in a DC 1500V energy storage system. When the present invention is used, the breaking capacity is up to 250kA at the maximum and 8 times In at the minimum. The breaking characteristic is stable and can fully meet the application occasions of the energy storage device.

[0037] The embodiments of the present invention are described in detail above, but the contents are only preferred embodiments of the present invention and cannot 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 a battery and a battery system, characterized in that: It includes a melting tube, a contact knife and a melt, wherein the contact knives are installed at both ends of the melting tube, a plurality of melt pieces are arranged in the inner cavity of the melting tube, and the melt is located between the two contact knives. The inner cavity of the melting tube is filled with a quartz sand filler, and the melt is provided with a plurality of rows of holes along the length direction, each row of the holes includes a plurality of through holes, and a narrow diameter is arranged between adjacent through holes.

2. The fuse for protecting a battery and a battery system according to claim 1, characterized in that: Each group of holes comprises 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 fuse for protecting a battery and a battery system according to claim 2, characterized in that: The narrow diameter widths between the through holes of the large-diameter hole array are the same, and the narrow diameter widths between the through holes of the small-diameter hole array are the same.

4. The fuse for protecting a battery and a battery system according to claim 1, characterized in that: 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 arranged on the inner side of the contact knife; the contact knife is fixed to the two 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 the center line, and the two ends of the melt are provided with connecting parts bent in the same direction, and 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 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 comprises a striker which is installed outside the melting tube and connected with a blown fuse indicator which is arranged in the indicating 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 the connection points on the cover plate.

9. The fuse for protecting a battery and a battery system according to claim 1, characterized in that: The melting tube is made of alumina ceramics.

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

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