Fireproof cable for energy storage system battery connection

Abstract

The present application relates to the technical field of cable, in particular to a fireproof cable for connecting energy storage system battery. The fireproof cable comprises a high-voltage cable and a cable joint, and a corrugated sheath pipe is sleeved on the high-voltage cable, the corrugated sheath pipe is used for protecting the high-voltage cable, a plurality of fire extinguishing mechanisms are arranged in the corrugated sheath pipe at intervals, each fire extinguishing mechanism comprises a fire blocking part and a fire extinguishing part, the fire extinguishing part is embedded in the fire blocking part in an array mode and covers around the high-voltage cable when fire breaks out. The fire extinguishing agent in the corrugated sheath pipe covers the fire area in sequence, the fire extinguishing agent near the fire area pre-inhibits the spread of the fire, the next position of the fire extinguishing agent sprays again, and the heat expansion layer is forced to shrink to make the corrugated sheath pipe close to the high-voltage cable, so as to accelerate the airflow and the spraying of the fire extinguishing agent, so that the fire extinguishing agent can not only cover the farther fire, but also improve the wrapping ability of the residual fire extinguishing agent, thereby improving the fire extinguishing effect.

Description

Technical Field

[0001] This invention relates to the field of cable technology, and more specifically, to a fire-resistant cable for connecting batteries in an energy storage system. Background Technology

[0002] High-voltage cables are a type of power cable, referring to power cables used to transmit power between 1kV and 1000kV. They are mainly used for power transmission and distribution. The components of a high-voltage cable, from the inside out, include: conductor, insulation, inner sheath, filler (armor), and outer insulation.

[0003] Chinese Patent Publication No. CN114141416A discloses a fire-resistant cable, comprising a conductor, an inner protective layer fixedly sleeved on the surface of the conductor, flame-retardant and fire-resistant tape wrapped around the outer surface of the inner protective layer, flame-retardant filler filling the inner cavity of the flame-retardant and fire-resistant tape, an outer protective layer fixedly sleeved on the outer surface of the flame-retardant and fire-resistant tape, a fireproof sleeve wrapped around the outer surface of the outer protective layer, an outer sheath fixedly sleeved on the outer surface of the fireproof sleeve, a fire-retardant coating sprayed on the outer surface of the outer sheath, and a fire extinguishing bag including packaging paper on the outer surface of the fire-retardant coating. The fire extinguishing bag prevents damage to the conductor inside the cable from flames and prevents the rapid spread of fire through the cable, thus achieving the purpose of fire extinguishing.

[0004] In existing technologies, the extinguishing agent will disperse around the cable under the action of the detonator to achieve the fire extinguishing function. However, the cable is usually circular in shape, which means that the extinguishing agent that the cable surface can bear is limited. A large amount of extinguishing agent will slide off the cable surface under the action of gravity, thus losing its fire extinguishing effect and causing waste. Summary of the Invention

[0005] This invention provides a fire-resistant cable for connecting batteries in an energy storage system. Fire extinguishing agent within a corrugated sheath sequentially covers the fire area. Near the fire, the extinguishing agent pre-inhibits the fire's spread, and at the next position, it is sprayed a second time. The inward contraction of the thermal expansion layer forces the corrugated sheath closer to the high-voltage cable, accelerating the airflow and extinguishing agent spray, thereby solving the problems mentioned in the background art.

[0006] To achieve the above objectives, the fire-resistant cable for battery connection in this energy storage system includes a high-voltage cable and a cable connector. A corrugated sheath is fitted over the high-voltage cable to protect it. Several fire-extinguishing mechanisms are spaced apart inside the corrugated sheath. Each fire-extinguishing mechanism includes a fire-blocking part and a fire-extinguishing part. The fire-extinguishing parts are arranged in an array within the fire-blocking part, covering the area around the high-voltage cable in the event of a fire. The fire-blocking part intercepts the fire, preventing its further spread. An expansion mechanism is wrapped around the corrugated sheath near both ends of the high-voltage cable. This expansion mechanism forces the corrugated sheath to tighten towards the high-voltage cable. The fire-extinguishing parts are released sequentially, carrying residual fire-extinguishing parts from the inner wall of the corrugated sheath and supplying them to the ends of the sheath.

[0007] Secondly, the fire-resistant part includes an outer fire-extinguishing ring that supports the corrugated sheath and an inner fire-extinguishing ring located inside the outer fire-extinguishing ring and wrapping the high-voltage cable. Several isolation plates are fixedly connected between the outer fire-extinguishing ring and the inner fire-extinguishing ring. The isolation plates alternately form a storage cavity for accommodating the fire-extinguishing part and an opening for the fire-extinguishing part to circulate.

[0008] The fire extinguishing unit includes a fire extinguishing agent pre-installed in the storage chamber. The fire extinguishing agent is made of dry powder fire extinguishing material. The storage chamber also contains an initiator. The lead wire connected to the initiator, which is closest to the end of the corrugated sheath tube, extends to the end of the corrugated sheath tube. Encapsulation paper is provided at both ends of the storage chamber and between the initiator and the fire extinguishing agent.

[0009] Furthermore, the isolation plate has inward-recessed ends and outward-expanding middle. The inward-recessed portion of the isolation plate at the detonator is used to withstand the impact force of the detonator's detonation. The inward-recessed portion of the isolation plate at the extinguishing agent is used to reduce the spray cross-section of the extinguishing agent.

[0010] In the above technical solution, the impact force of the detonator after the explosion breaks through the extinguishing agent. At the same time, under the action of the impact force, the extinguishing agent is sprayed outward and covers the fire source. By reducing the spray cross section of the extinguishing agent, the impact force of the extinguishing agent during spray can be increased. On the one hand, the fire range that the extinguishing agent can cover is farther. On the other hand, the initial spray velocity of the extinguishing agent is greater, which improves the extinguishing effect on the nearby fire.

[0011] Preferably, the expansion mechanism package is a thermal expansion layer that is fitted onto the outer wall of the corrugated sheath tube. The thermal expansion layer is expanded mica, and the thermal expansion layer is close to the insulating sheath and located between adjacent fire extinguishing outer rings.

[0012] The thermal expansion layer is encased in a fire-extinguishing ring to limit its expansion. This allows the thermal expansion layer to exert pressure on the corrugated sheath when it expands due to heat, forcing the inner wall of the corrugated sheath to come closer to the high-voltage cable, thereby reducing the cross-section of the material conveying channel at that location.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0014] The extinguishing agent inside the corrugated sheath is sequentially applied to the fire area. The extinguishing agent near the fire initially inhibits the spread of the fire, while the extinguishing agent at the next position is sprayed a second time. The synergistic effect of the thermal expansion layer causing the corrugated sheath to contract and bring it closer to the high-voltage cable accelerates the airflow and extinguishing agent spray. This not only allows the extinguishing agent to cover a greater distance from the fire but also improves the ability to entrain residual extinguishing agent, thereby enhancing the fire extinguishing effect. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0016] Figure 2 This is a partial cross-sectional view of the insulating sheath, thermal expansion layer, and fire extinguishing ring of the present invention.

[0017] Figure 3 This is a front view of the internal structure of the corrugated sheath and insulating sheath of the present invention.

[0018] Figure 4 This is a schematic diagram of the airflow and extinguishing agent circulation structure of the present invention;

[0019] Figure 5 This is a top view of the structure of the detonator and extinguishing agent of the present invention;

[0020] Figure 6 This is a schematic diagram of the fire extinguishing agent injection of the present invention;

[0021] Figure 7 This is a schematic diagram of the extinguishing agent of the present invention being sprayed in the material conveying channel.

[0022] The meanings of the labels in the diagram are as follows:

[0023] 100. High-voltage cable; 101. Cable joint; 102. Corrugated sheath; 103. Insulating sheath; 104. Material conveying channel;

[0024] 110. Thermal expansion layer; 111. Fire extinguishing ring;

[0025] 120. Extinguishing mechanism; 121. Outer extinguishing ring; 122. Inner extinguishing ring; 123. Ignition agent; 123a. Lead wire; 124. Extinguishing agent; 125. Sealing paper; 126. Opening;

[0026] 130. Isolation film. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] In existing technologies, extinguishing agents are dispersed around the cable under the action of the ignition material, thus extinguishing the fire. However, the cable is usually circular, which limits the amount of extinguishing agent that can be covered on its surface. A large amount of extinguishing agent slides off the cable surface under gravity, thus losing its extinguishing effect and resulting in waste. This invention provides a fire-resistant cable for connecting batteries in an energy storage system. See [link to relevant documentation]. Figures 1-3 As shown, the device includes a high-voltage cable 100 and a cable connector 101. A corrugated sheath 102 is fitted over the high-voltage cable 100 to protect it. The corrugated sheath 102 is equipped with several fire extinguishing mechanisms 120 at intervals inside the corrugated sheath 102. Each fire extinguishing mechanism 120 includes a fire-blocking part and a fire-extinguishing part. The fire-extinguishing part is embedded in the fire-blocking part in an array and covers the high-voltage cable 100 when a fire breaks out. The fire-blocking part is used to intercept the fire and prevent it from spreading further.

[0029] First, to prevent the intrusion of moisture, dust, chemicals, and other contaminants, insulating sleeves 103 are provided at both ends of the corrugated sheath 102. The insulating sleeve 103 is made of polytetrafluoroethylene, and one end of the insulating sleeve 103 is wrapped around the corrugated sheath 102, while the other end is wrapped around the high-voltage cable 100 to limit the intrusion of external impurities. Due to aging from daily use, coupled with the exposure to high-temperature flames, when the temperature exceeds the heat resistance limit of the insulating sleeve 103 material, the insulating sleeve 103 will begin to decompose, carbonize, or burn. In this case, it will lose its structural integrity, leading to detachment or breakage, thereby exposing the high-voltage cable 100.

[0030] Therefore, when the insulating sheath 103 falls off, its two sides become conductive, and the flame will burn along the high-voltage cable 100 and the corrugated sheath 102. During this process, the flame-blocking part closest to the fire source intercepts the fire. The following is based on... Figure 3 Based on and combined Figure 4 , Figure 5 , Figure 6As shown, the fire-arresting part is disclosed. The fire-arresting part includes an outer fire-extinguishing ring 121 supporting the corrugated sheath 102, and an inner fire-extinguishing ring 122 located inside the outer fire-extinguishing ring 121 and wrapping the high-voltage cable 100. Several isolation plates 130 are fixedly connected between the outer fire-extinguishing ring 121 and the inner fire-extinguishing ring 122. Storage chambers for accommodating the fire-extinguishing part and openings 126 for the fire-extinguishing part to circulate are alternately formed between the isolation plates 130. Next, the fire-extinguishing part is disclosed. The fire-extinguishing part includes a fire extinguishing agent 124 pre-installed in the storage chamber. The fire extinguishing agent 124 is made of dry powder fire extinguishing material. The storage chamber also contains an initiator 123. A lead wire 123a connected to the initiator 123 closest to the end of the corrugated sheath 102 extends towards the end of the corrugated sheath 102. Encapsulation paper 125 is provided at both ends of the storage chamber and between the initiator 123 and the fire extinguishing agent 124. The specific fire-extinguishing principle is as follows:

[0031] When a fire occurs, the flame burns from one end of the corrugated sheath 102 to the other end. The flame ignites the fuse 123a, which in turn ignites the detonator 123. The detonator 123 explodes, causing the extinguishing agent 124 between the sealing paper 125 to explode. At the same time, under the action of the detonator 123, the extinguishing agent 124 is sprayed around the fire, covering the fire and thus extinguishing it.

[0032] It should be noted that: the detonator 123 uses a low-energy detonator, with a detonator mass of 50-500 mg (such as lead azide or guanidine nitrate compound). The explosion pressure is 0.1-1 MPa (sufficient to tear the sealing paper 125 and spray the extinguishing agent 124), while the cable will not be damaged under the protection of the inner extinguishing ring 122.

[0033] Since the lead wire 123a closest to the end of the corrugated sheath 102 extends to the end of the corrugated sheath 102 (not shown in the figure), once a fire occurs at the end of the corrugated sheath 102, the lead wire 123a will ignite the detonator 123 closest to the fire source, and the detonators 123 in multiple storage chambers will be ignited in the existing order according to the lead wire 123a. Then, the next body position lead wire 123a extends to the side of the fire extinguishing outer ring 121 closest to the end of the corrugated sheath 102 (not shown in the figure). It should be understood that the lead wire 123a closest to the end of the corrugated sheath 102 refers to the lead wire 123a at position f1 or h1, and the next body position lead wire 123a refers to the lead wire 123a at position f2 or h2.

[0034] On the other hand, the isolation plate 130 is concave at both ends and convex in the middle. The concave part of the isolation plate 130 located at the detonator 123 is used to resist the impact force of the detonator 123. That is, when the detonator 123 is detonated, the detonator 123 will generate an outward impact force. The concave part of the isolation plate 130 located at the detonator 123 blocks the impact force, forcing the detonator 123 to convert the impact force into the power to propel the extinguishing agent 124, thereby providing stronger power for spraying the extinguishing agent 124. Moreover, the detonation of the detonator 123 will also transmit an impact force to the other side (this impact force is f2 to h1). This impact force is discharged from the end of the corrugated sheath 102 and can extinguish small fires.

[0035] Secondly, the inward-retracting portion of the isolation plate 130 located at the extinguishing agent 124 is used to reduce the spray cross-section of the extinguishing agent 124. In this way, the impact force of the detonator 123 after detonation will break through the extinguishing agent 124. At the same time, under the action of the impact force, the extinguishing agent 124 will be sprayed outward and cover the fire source. By reducing the spray cross-section of the extinguishing agent 124, the impact force of the extinguishing agent 124 when sprayed can be increased. On the one hand, the fire range that the extinguishing agent 124 can cover is farther. On the other hand, the initial spray velocity of the extinguishing agent 124 is greater, which improves the extinguishing effect on the nearby fire.

[0036] Furthermore, in combination Figure 7 As shown, as the fire moves from the end of the corrugated sleeve 102 towards the middle, if the fire continues to spread towards the middle of the corrugated sleeve 102, the corrugated sleeve 102 will burn, and the remaining corrugated sleeve 102 will fall off the inner wall; therefore, after the extinguishing agent 124 at f1 is sprayed (i.e., the fire has not yet reached f1, but the fuse 123a at f1 has been pre-ignited, and the detonator 123 has detonated first), some of the extinguishing agent 124 will remain on the inner wall of the corrugated sleeve 102. At this time, the fuse at f2... Line 123a is ignited sequentially, that is, the detonator 123 at f1-f2 is detonated sequentially. In this way, when the detonator 123 at f1 detonates, the extinguishing agent 124 remaining on the inner wall of the corrugated sleeve 102 is detonated. When the detonator 123 at f2 detonates, the airflow and the extinguishing agent 124 flow through the opening 126 at f1. Furthermore, the newly sprayed extinguishing agent 124 entrains the extinguishing agent 124 remaining on the inner wall of the corrugated sleeve 102 and pushes it toward the fire area, thereby improving the fire extinguishing effect.

[0037] Meanwhile, in order to further improve the fire extinguishing effect of extinguishing agent 124, an expansion mechanism is wrapped around the corrugated sheath 102 near both ends of the high-voltage cable 100. The expansion mechanism forces the corrugated sheath 102 to tighten towards the high-voltage cable 100 through expansion. The extinguishing agent 124 is released successively and carries the residual extinguishing agent 124 on the inner wall of the corrugated sheath 102 to the end of the corrugated sheath 102, thereby improving the fire extinguishing effect.

[0038] Therefore, the expansion mechanism is disclosed, which includes a thermal expansion layer 110 that is fitted onto the outer wall of the corrugated sheath 102. The thermal expansion layer 110 is expanded mica, and it is close to the insulating sheath 103 and located between adjacent fire extinguishing outer rings 121 (see reference). Figure 2 (As shown), and the thermal expansion layer 110 is surrounded by a fire extinguishing ring 111 to restrict its expansion, so that when the thermal expansion layer 110 expands due to heat, it applies pressure inward to the corrugated sheath 102; thus, when the thermal expansion layer 110 expands due to heat, under the restriction of the fire extinguishing ring 111, the thermal expansion layer 110 applies pressure inward to the corrugated sheath 102, forcing the inner wall of the corrugated sheath 102 to come close to the high-voltage cable 100 (see reference). Figure 7 As indicated by the middle arrows g1 and g2), the cross-section of the material conveying channel 104 at that location is reduced (the material conveying channel 104 is formed between the high-voltage cable 100 and the inner wall of the corrugated sheath 102, and the material conveying channel 104 is used to transfer the extinguishing agent 124 to the fire area), thereby increasing the airflow and the velocity of the extinguishing agent 124 flowing through the reduced material conveying channel 104 when the detonator 123 is detonated at f2, and improving the entrainment effect on the residual extinguishing agent 124 on the inner wall of the corrugated sheath 102;

[0039] In other words, the extinguishing agent 124 inside the corrugated sheath 102 sequentially covers the fire area. The extinguishing agent 124 near the fire inhibits the spread of the fire in advance, and the extinguishing agent 124 at the next position is sprayed a second time. The synergistic effect of the thermal expansion layer 110 contracting inward forces the corrugated sheath 102 to get closer to the high-voltage cable 100, which accelerates the airflow and the spray of the extinguishing agent 124. This allows the extinguishing agent 124 to not only cover the fire further away, but also improves the ability to entrain residual extinguishing agent 124, thereby improving the fire extinguishing effect.

[0040] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A fire-resistant cable for connecting batteries in an energy storage system, characterized in that: The system includes a high-voltage cable (100) and a cable connector (101). A corrugated sheath (102) is fitted over the high-voltage cable (100) to protect it. The corrugated sheath (102) has several fire-extinguishing mechanisms (120) spaced apart inside it. Each fire-extinguishing mechanism (120) includes a fire-blocking part and a fire-extinguishing part. The fire-extinguishing parts are arranged in an array within the fire-blocking part. In the event of a fire... Covering around the high-voltage cable (100), the fire-blocking part is used to intercept the fire and prevent the fire from spreading further. It works in conjunction with the expansion mechanism wrapped around the corrugated sheath (102) near both ends of the high-voltage cable (100). The expansion mechanism forces the corrugated sheath (102) to tighten towards the high-voltage cable (100) through expansion. The fire-extinguishing part is released in sequence and carries the fire-extinguishing part remaining on the inner wall of the corrugated sheath (102) to the end of the corrugated sheath (102). The fire arrestor includes an outer fire-extinguishing ring (121) that supports the corrugated sheath (102) and an inner fire-extinguishing ring (122) located inside the outer fire-extinguishing ring (121) and wrapping the high-voltage cable (100). Several isolation plates (130) are fixedly connected between the outer fire-extinguishing ring (121) and the inner fire-extinguishing ring (122). The isolation plates (130) alternately form a storage chamber for accommodating the fire-extinguishing part and an opening (126) for the fire-extinguishing part to circulate. The fire extinguishing unit includes a fire extinguishing agent (124) pre-installed in the storage chamber. The fire extinguishing agent (124) is made of dry powder fire extinguishing material. The storage chamber also contains an initiator (123). The lead wire (123a) connected to the initiator (123) closest to the end of the corrugated sheath (102) extends to the end of the corrugated sheath (102). Encapsulation paper (125) is provided at both ends of the storage chamber and between the initiator (123) and the fire extinguishing agent (124). The isolation plate (130) is recessed at both ends and expanded in the middle. The recessed part of the isolation plate (130) located at the detonator (123) is used to resist the impact force of the detonator (123) detonation. The recessed part of the isolation plate (130) located at the extinguishing agent (124) is used to reduce the spray cross section of the extinguishing agent (124).

2. The fire-resistant cable for connecting batteries in an energy storage system according to claim 1, characterized in that: Insulating sleeves (103) are provided at both ends of the corrugated sheath (102). The insulating sleeves (103) are made of polytetrafluoroethylene. One end of the insulating sleeve (103) is wrapped around the corrugated sheath (102), and the other end is wrapped around the high-voltage cable (100) to restrict the intrusion of external impurities.

3. The fire-resistant cable for connecting batteries in an energy storage system according to claim 1, characterized in that: The expansion mechanism package is a thermal expansion layer (110) that is attached to the outer wall of the corrugated sheath (102). The thermal expansion layer (110) is expanded mica. The thermal expansion layer (110) is close to the insulating sheath (103) and is located between the adjacent fire extinguishing outer ring (121).

4. The fire-resistant cable for connecting batteries in an energy storage system according to claim 1, characterized in that: A material conveying channel (104) is formed on the inner wall of the high-voltage cable (100) and the corrugated sheath (102). The material conveying channel (104) is used to deliver the extinguishing agent (124) to the fire area.

5. The fire-resistant cable for connecting batteries in an energy storage system according to claim 4, characterized in that: The thermal expansion layer (110) is fitted with a fire extinguishing ring (111) to limit the expansion of the thermal expansion layer (110), so that when the thermal expansion layer (110) expands due to heat, it applies pressure to the corrugated sheath (102) inward, forcing the inner wall of the corrugated sheath (102) to come closer to the high-voltage cable (100), thereby reducing the cross-section of the material conveying channel (104) at that location.

Images