Cable for energy storage system and energy storage system

Abstract

The invention relates to the technical field of cables, in particular to a cable for an energy storage system and the energy storage system. Comprising a plurality of conductors, a sheath is sleeved among the outer walls of the plurality of conductors, so that the conductors and the sheath form a flat cable adaptive energy storage system, and a plurality of longitudinal grooves and transverse grooves are formed in the upper surface and the lower surface of the sheath. In the cable for the energy storage system and the energy storage system, the arc-shaped design of the longitudinal groove not only provides an air circulation space between the cable and the inner wall of the energy storage system, but also guides air flow to pass through smoothly through the first inclined surface and the second inclined surface, so that local heat accumulation is avoided; meanwhile, the arc-shaped structure is also convenient for dust to slide down or be cleaned by a cleaning tool, and the problem that the heat dissipation efficiency is influenced by dust accumulation is reduced; due to the design of the elastic fixing pieces, the sealing performance and stability between the structures are further enhanced, the U-shaped elastic fixing pieces made of rubber materials are partially embedded into the transverse grooves in the initial state, and pre-tightening force is generated so that the U-shaped elastic fixing pieces can be tightly attached to the transverse grooves.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cables, in particular to a cable for energy storage system and an energy storage system. BACKGROUND

[0002] The cable for energy storage system is mainly used for the connection between battery modules, between battery clusters, between the battery cluster and the busbar box and between the battery cluster and the energy storage converter on the DC side of the power storage system, and is a key component for realizing power transmission and distribution.

[0003] The energy storage system is a device system taking the battery as an energy storage carrier and storing and releasing recyclable electric energy through the converter, which can effectively adjust the voltage, frequency and phase changes of the power grid caused by renewable energy, and is a necessary guarantee for promoting large-scale renewable power generation and power grid safety.

[0004] At present, the flat water cross-linked polyethylene insulated power cable on the market has many drawbacks in the application of the energy storage system. This kind of cable is directly installed in the energy storage system, and the outer wall is closely attached to the inner wall of the system, almost without gap, so that air circulation is difficult. When the energy storage system is running, the cable continuously transmits electric energy, and heat is inevitably generated. Due to the lack of effective heat dissipation channels, a large amount of heat accumulates and is difficult to dissipate;

[0005] In a high temperature environment for a long time, the aging speed of the cable insulation layer is accelerated sharply. Once the insulation layer is aged, its mechanical properties will decrease and become fragile and vulnerable. This not only seriously shortens the service life of the cable, greatly increases the cost of replacing the cable and the maintenance workload, but also directly threatens the stable operation of the energy storage system, and may cause short circuit, electric leakage and other faults at any time, thereby affecting the normal operation of the entire energy storage system, and even causing a major hidden danger to the life safety of related personnel;

[0006] At the same time, due to the existence of contact resistance and current load concentration and other factors, the cable interface part is more prone to heat accumulation than other parts of the cable, and the temperature is significantly higher. In a high temperature environment, the insulation layer ages rapidly, and the insulation performance continuously decreases. The insulation layer gradually becomes hard and brittle, and even cracks. In view of this, we propose a cable for energy storage system and an energy storage system. SUMMARY

[0007] The purpose of the present application is to provide a cable for energy storage system and an energy storage system to solve the problems that the flat cross-linked polyethylene insulated power cable used in the energy storage system has no gap between the cable outer wall and the system inner wall, air circulation is difficult, heat accumulates, the insulation layer ages rapidly, the service life of the cable is shortened, and the system is stable. The heat accumulation of the cable interface is obvious due to the contact resistance and other factors, which further aggravates the aging of the insulation layer.

[0008] To achieve the above technical problems, one of the purposes of the present application is to provide a cable for energy storage system, comprising a plurality of conductors, a plurality of conductors are sleeved with a sheath between the outer wall, so that the conductor and the sheath form a flat cable suitable for the energy storage system, a plurality of longitudinal grooves and transverse grooves are formed on the upper and lower surfaces of the sheath, and a heat dissipation mechanism is installed in one of the transverse grooves, wherein:

[0009] The heat dissipation mechanism is installed in any one of the transverse grooves according to the target heat dissipation area, the target heat dissipation area includes the cable heating area and the energy storage system heat dissipation area, and the bidirectional air outlet of the heat dissipation mechanism is in one-to-one correspondence with the plurality of longitudinal grooves.

[0010] The beneficial effects of the present application are:

[0011] 1、In the present application, the longitudinal grooves form a gap between the cable and the inner wall of the energy storage system, which creates conditions for air flow, and the self-cleaning property of the transverse grooves avoids dust from blocking the air flow channel, ensuring the basic heat dissipation environment; the heat dissipation mechanism is installed in the transverse groove as needed, the air outlet of the heat dissipation mechanism is connected with the longitudinal groove to form a flow channel, and the directional air convection enhances the heat dissipation effect, which not only provides a heat dissipation space, but also ensures the smoothness of the air flow path, and realizes precise and efficient heat dissipation.

[0012] 2、In the present application, the longitudinal grooves and the transverse grooves form a groove structure, which not only solves the heat dissipation problem, but also provides a carrier for the installation of the heat dissipation mechanism; the flexible installation characteristics of the heat dissipation mechanism can focus on heat dissipation at key parts such as cable interfaces, fully utilizing the advantages of the groove structure; and the formation of the flow channel further enhances the combination effect of the groove ventilation and the heat dissipation mechanism, effectively improving the overall adaptability and reliability of the cable in the energy storage system, and reducing the frequency of energy storage system downtime caused by cable failure.

[0013] As a further improvement of the present technical solution, the outer periphery of the conductor is wrapped with an insulating layer, a filling layer is arranged in the gap between the conductor and the sheath, and elastic fixing members are fixedly connected to both sides of the sheath, the material of the elastic fixing members is rubber, which is used to fix the position of the heat dissipation mechanism, the height of the elastic fixing members is slightly higher than the height of the transverse groove, the elastic fixing members are embedded in the inside of the transverse groove in the initial state, the elastic fixing members still maintain sealing with the transverse groove in the stretched state, and the elastic fixing members are in U-shaped and matched with the transverse groove.

[0014] The beneficial effects of the above further scheme are that the elastic fixing members are matched with the transverse groove, the initial embedding and stretching sealing characteristics ensure the stable installation of the heat dissipation mechanism, and at the same time, the elastic fixing members cooperate with the notch groove of the heat dissipation box, further enhancing the installation reliability and prolonging the service life of the cable and the heat dissipation mechanism.

[0015] As a further improvement of the technical solution, the longitudinal groove is arc-shaped as a whole, the longitudinal groove comprises a first inclined surface and a second inclined surface fixedly connected with the sheath, the transverse groove and the longitudinal groove are vertically staggered, the depth of the transverse groove is the same as that of the longitudinal groove, and the transverse groove is rectangular, the heat dissipation mechanism comprises a heat dissipation box located in the transverse groove, air outlets are formed on both sides of the heat dissipation box, the air outlets correspond to and communicate with the longitudinal grooves one by one, and a heat dissipation fan is fixedly installed in the heat dissipation box, and notches are formed at both ends of the heat dissipation box and are matched with the elastic fixing members.

[0016] The beneficial effects of the above further scheme are that the heat dissipation mechanism, the transverse and longitudinal grooves and the flow guide channel form a heat dissipation network, the airflow generated by the heat dissipation fan flows to the cable through the air outlets and the longitudinal grooves, the transverse and longitudinal grooves are designed to have the same depth to reduce airflow resistance, the arc-shaped longitudinal groove optimizes the airflow path, heat is quickly dissipated, the accelerated aging of the cable due to high temperature is avoided, and the stable operation of the energy storage system is ensured.

[0017] The second object of the present application is to provide an energy storage system method, which is applied to the energy storage system cable described in any one of the above embodiments, and the energy storage system comprises an energy storage box body and a bolt arranged in the energy storage box body, and the energy storage box body is connected with the inner wall of the energy storage system through the bolt.

[0018] 1. In the energy storage system cable and the energy storage system, the arc-shaped design of the longitudinal groove not only provides an air flow space between the cable and the inner wall of the energy storage system, but also guides the airflow to flow smoothly through the first inclined surface and the second inclined surface, avoiding local heat accumulation; at the same time, the arc-shaped structure also facilitates dust sliding or being removed by a cleaning tool, reducing the problem of affecting the heat dissipation efficiency due to dust accumulation.

[0019] 2. In the energy storage system cable and the energy storage system, the heat dissipation mechanism is flexibly positioned by being embedded in the transverse groove, can be deployed according to the actual heating area, especially in the high-heat concentrated area such as the cable interface, to improve the heat dissipation response speed, the air outlets arranged on both sides of the heat dissipation box correspond to and communicate with the longitudinal grooves one by one, forming a precise flow guide channel, so that the airflow generated by the heat dissipation fan can directly act on the surface of the cable along the longitudinal groove, quickly taking away the heat, and preventing the insulation layer from aging or performance degradation due to high temperature.

[0020] 3. In the energy storage system cable and the energy storage system, the design of the elastic fixing member further enhances the sealing and stability between the structures, the U-shaped elastic fixing member made of rubber is partially embedded in the transverse groove in the initial state, generates a pre-tightening force to maintain close fitting with the transverse groove, when the heat dissipation mechanism is inserted into the transverse groove, the elastic fixing member deforms with it and is clamped into the notches at both ends of the heat dissipation box, which not only achieves firm fixation of the heat dissipation box, but also effectively seals the gap between the heat dissipation mechanism and the sheath, preventing cold air leakage and improving the air tightness and energy efficiency of the heat dissipation system. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a front view of the present application;

[0022] Figure 2 is a schematic diagram of the overall structure assembly of the present application;

[0023] Figure 3 is a schematic diagram of the gas flow of the present application;

[0024] Figure 4 is a schematic diagram of the heat dissipation mechanism assembly of the present application;

[0025] Figure 5 is a schematic diagram of the heat dissipation mechanism of the present application;

[0026] Figure 6 is a schematic diagram of the cable assembly in the energy storage box of the present application.

[0027] The meanings of various reference numerals in the drawings are as follows:

[0028] 100, conductor;

[0029] 200, sheath; 201, elastic fixing member;

[0030] 300, longitudinal groove; 301, first inclined surface; 302, second inclined surface;

[0031] 400, transverse groove;

[0032] 500, heat dissipation mechanism; 501, heat dissipation box; 502, gas outlet hole

[0033] 600, energy storage box.

[0034] DETAILED DESCRIPTION MLD mld MLD

[0035] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application. Embodiment 1

[0036] As shown in the drawings, Figures 1-6 One of the objects of the present application is to provide a cable for an energy storage system, which includes a plurality of conductors 100, a sheath 200 is sleeved between the outer walls of the plurality of conductors 100, so that the conductors 100 and the sheath 200 form a flat cable suitable for an energy storage system, a plurality of longitudinal grooves 300 and transverse grooves 400 are formed on the upper and lower surfaces of the sheath 200, and a heat dissipation mechanism 500 is installed in one of the transverse grooves 400, wherein:

[0037] The heat dissipation mechanism 500 is installed in any one of the horizontal grooves 400 according to a target heat dissipation area, the target heat dissipation area including a cable heat generation area and an energy storage system heat dissipation area, and the bidirectional air outlet of the heat dissipation mechanism 500 is in one-to-one correspondence with the plurality of vertical grooves 300.

[0038] Therefore, based on the above features, the improvement points of the present application are described in detail:

[0039] Considering that the flat cable (which is a water cross-linked polyethylene insulated power cable) on the market is directly installed inside the energy storage system, the outer wall of the cable is closely attached to the inner wall of the energy storage system, and there is a lack of necessary gap between the two, which hinders air circulation, making it difficult to effectively dissipate the heat generated by the cable operation, and it is easy to form heat accumulation in a local area, and in a long-term high-temperature environment, the insulation layer of the cable ages rapidly and the mechanical properties decrease, not only shortening the service life of the cable, but also posing a major threat to the stable operation of the energy storage system and personnel safety, therefore, a plurality of horizontal grooves 400 and vertical grooves 300 are provided on the upper and lower surfaces of the sheath 200, on the one hand, through the design of the vertical grooves 300, the cable is not completely attached to the inner wall of the energy storage system, and a sufficient gap is formed between the two to ensure air circulation, facilitate cable heat dissipation, and avoid overheating of the cable due to heat accumulation, affecting its performance and service life; on the other hand, the special shape structure of the horizontal grooves 400 can facilitate the dust falling on the surface of the cable to slide or be discharged smoothly, thereby cleaning the dust on the surface of the cable in time, effectively avoiding the accumulation of dust on the surface of the cable, avoiding the problem of poor cable heat dissipation caused by long-term accumulation of dust, ensuring that the working temperature of the cable is within the normal range, and prolonging its service life;

[0040] Meanwhile, in actual operation, due to the influence of factors such as contact resistance and current load at the cable interface, heat is easily accumulated, resulting in a temperature significantly higher than that of other parts of the cable. High temperature can accelerate the aging of the cable insulation layer, reduce the insulation performance, cause the insulation layer to become hard, brittle or even crack, and greatly shorten the service life of the cable. Therefore, the position of the heat dissipation mechanism 500 is regulated and installed by using the transverse groove 400. On the one hand, the heat dissipation mechanism 500 is supported for flexible installation, which can be arranged at a specified position according to actual needs. For the areas where high heat is easily generated, such as the cable interface, timely and effective heat dissipation is achieved, effectively reducing the risk of aging and damage caused by high heat accumulation at the cable interface, and ensuring the stability and reliability of the electrical connection of the cable. On the other hand, the two-way air outlet of the heat dissipation mechanism 500 is in one-to-one correspondence with the plurality of longitudinal grooves 300, so that a flow guide channel is formed between the two-way air outlet and the plurality of longitudinal grooves 300. The flow guide channel allows the airflow generated by the heat dissipation mechanism 500 to accurately and efficiently reach the cable area, accelerating air circulation and quickly removing the heat generated during cable operation, effectively preventing heat accumulation and ensuring that the cable works at an appropriate temperature, prolonging the service life. At the same time, the one-to-one correspondence facilitates uniform dispersion of the airflow, avoids excessive or insufficient local airflow, and allows the cables in the entire energy storage system to be well cooled, eliminating dead spots.

[0041] On the basis of the above, the specific structure is disclosed in detail:

[0042] To achieve protection of the conductor 100, the structure between the conductor 100 and the sheath 200 is disclosed in detail, as shown in Figure 1 The conductor 100 is wrapped with an insulation layer, and a filler layer is arranged at the gap between the conductor 100 and the sheath 200. The insulation layer directly wraps the conductor 100, isolates current leakage, avoids short circuit or electric leakage risk, and ensures electrical safety of the cable. The filler layer fills the gap to prevent the insulation layer from deforming due to external pressure and maintain the stability of the insulation structure.

[0043] Further, to achieve installation of the cable, the structure of the sheath 200 is disclosed in detail, as shown in Figure 2 and Figure 3 The sheath 200 is fixedly connected with elastic fixing members 201 on both sides. The material of the elastic fixing members 201 is rubber, which is used to fix the position of the heat dissipation mechanism 500. The arrangement of the elastic fixing members 201 not only fixes the heat dissipation mechanism 500 at the desired position, but also seals the flow guide channel formed between the heat dissipation mechanism 500 and the longitudinal groove 300, preventing cold air from leaking from the sheath 200 and ensuring the efficiency of cable cooling.

[0044] Specifically, the height of the elastic fixing member 201 is slightly higher than the height of the horizontal groove 400, the elastic fixing member 201 is embedded in the inside of the horizontal groove 400 in the initial state, the elastic fixing member 201 still maintains sealing with the horizontal groove 400 in the stretched state, the elastic fixing member 201 is in the shape of U as a whole and is matched with the horizontal groove 400, the height of the elastic fixing member 201 is slightly higher than the height of the horizontal groove 400, the elastic fixing member 201 is compressed to generate a pre-tightening force when it is initially embedded, and the elastic fixing member 201 is tightly attached to the inner wall of the horizontal groove 400; when the fixing member needs to assemble the heat dissipation mechanism 500, the fixing member deforms synchronously with the heat dissipation mechanism 500, the U-shaped structure of the fixing member maintains the sealing surface contact through elastic extension, and gas leakage is prevented.

[0045] Then, in order to realize the gap between the cable and the energy storage system during installation, as shown in Figure 3 and Figure 4 , the longitudinal groove 300 is in the shape of an arc as a whole, the longitudinal groove 300 comprises a first inclined surface 301 and a second inclined surface 302 fixedly connected with the sheath 200, through the design of the first inclined surface 301 and the second inclined surface 302 on the longitudinal groove 300, the longitudinal groove 300 is in the shape of an arc as a whole, which facilitates the cleaning of dust in the longitudinal groove 300, avoids the dust from gathering in the inside of the longitudinal groove 300, and interferes with the heat dissipation of the cable, the smooth arc surface has no recess, and when the staff uses compressed air or a soft brush to clean, the airflow or the bristles can move smoothly along the arc surface, and the residual dust can be quickly removed;

[0046] Specifically, the horizontal groove 400 and the longitudinal groove 300 are in a perpendicular staggered shape, the depth of the horizontal groove 400 is the same as the depth of the longitudinal groove 300, and the horizontal groove 400 is in the shape of a rectangle, the horizontal groove 400 and the longitudinal groove 300 maintain the same depth, so that the gas flows smoothly, the same depth avoids the turbulence or vortex generated by the sudden change of the cross section of the gas at the intersection of the horizontal groove 400 and the longitudinal groove 300, so that the airflow remains stable, and the gas can be evenly diffused to each area of the energy storage system.

[0047] Next, in order to realize the heat dissipation of the cable, the heat dissipation mechanism 500 is disclosed in detail, as shown in Figure 5As shown, the heat dissipation mechanism 500 comprises a heat dissipation box 501 located in the transverse groove 400, both sides of the heat dissipation box 501 are provided with air outlet holes 502, the air outlet holes 502 correspond to and communicate with the longitudinal grooves 300, the heat dissipation box 501 is fixedly installed with a heat dissipation fan inside, both ends of the heat dissipation box 501 are provided with notched grooves and are matched with the elastic fixing members 201, the air outlet holes 502 on both sides of the heat dissipation box 501 correspond to and communicate with the longitudinal grooves 300, so that the airflow generated by the heat dissipation fan can directly flow to the cable along the longitudinal grooves 300, and the heat generated during the operation of the cable can be accurately taken away; the notched grooves at both ends of the heat dissipation box 501 are matched with the elastic fixing members 201, during installation, the pre-tightening force of the elastic fixing members 201 can be used to stably embed the heat dissipation box 501 in the transverse groove 400, so that the heat dissipation box 501 is not loose in the vibration environment, and the sealing property of the elastic fixing members 201 also avoids air leakage between the heat dissipation box 501 and the transverse groove 400.

[0048] The second object of the present application is to provide an energy storage system method applied to the energy storage system cable of any one of the above, the energy storage system comprising an energy storage box 600 and a bolt arranged inside the energy storage box 600, and the sheath 200 and the inner wall of the energy storage system are connected by the bolt.

[0049] The working principle of the present application is as follows:

[0050] The sheath 200 is provided with longitudinal grooves 300 and transverse grooves 400 on the upper and lower surfaces, wherein the transverse grooves 400 are used for installing the heat dissipation mechanism 500, and the longitudinal grooves 300 are used as heat dissipation channels and communicate with the air outlets of the heat dissipation mechanism 500, so as to realize efficient heat dissipation; the heat dissipation mechanism 500 can be flexibly installed in any one of the transverse grooves 400 according to the actual heating area of the cable and the heat dissipation requirement of the energy storage system, and has good adaptability; the heat dissipation mechanism 500 is provided with a heat dissipation fan inside, heat is discharged from the longitudinal grooves 300 through the air outlet holes 502 on both sides, convection heat dissipation is formed, the operation temperature of the cable is effectively reduced, and performance degradation or safety hazards caused by overheating are prevented; in the initial state, part of the heat dissipation mechanism 500 is embedded in the transverse groove 400, and the heat dissipation mechanism 500 can still maintain a sealed state when being stretched, so as to prevent external factors such as dust and moisture from affecting the normal work of the heat dissipation mechanism 500; in addition, the height of the elastic fixing member 201 is slightly higher than that of the transverse groove 400, so that the elastic fixing member 201 can tightly fit the surface of the sheath 200 when not being subjected to external force, and the compactness and protection level of the overall structure are improved.

[0051] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above-mentioned embodiments, and the above-mentioned embodiments and descriptions in the specification are only preferred examples of the present application and are not intended to limit the present application. Various changes and improvements can be made to the present application without departing from the spirit and scope of the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A cable for an energy storage system, comprising a plurality of conductors (100), wherein a sheath (200) is sleeved between the outer walls of the plurality of conductors (100), such that the conductors (100) and the sheath (200) form a flat cable adapted to the energy storage system, characterized in that: The sheath (200) has multiple longitudinal grooves (300) and transverse grooves (400) on both its upper and lower surfaces. A heat dissipation mechanism (500) is installed in one of the transverse grooves (400). The heat dissipation mechanism (500) is installed in any one of the horizontal slots (400) according to the target heat dissipation area. The target heat dissipation area includes the cable heat dissipation area and the energy storage system heat dissipation area. The bidirectional air outlet of the heat dissipation mechanism (500) is connected to the multiple vertical slots (300) one by one.

2. The cable for an energy storage system according to claim 1, characterized in that: The conductor (100) is wrapped with an insulating layer on its outer periphery, and a filling layer is provided in the gap between the conductor (100) and the sheath (200).

3. The cable for an energy storage system according to claim 1, characterized in that: Both sides of the sheath (200) are fixedly connected with elastic fasteners (201), which are made of rubber and are used to fix the position of the heat dissipation mechanism (500).

4. The cable for an energy storage system according to claim 3, characterized in that: The height of the elastic fastener (201) is slightly higher than the height of the transverse groove (400), and the elastic fastener (201) is embedded inside the transverse groove (400) in the initial state.

5. The cable for an energy storage system according to claim 3, characterized in that: The elastic fastener (201) remains sealed to the transverse groove (400) even when stretched. The elastic fastener (201) is U-shaped and adapted to the transverse groove (400).

6. The cable for an energy storage system according to claim 1, characterized in that: The longitudinal groove (300) is arc-shaped in general, and the longitudinal groove (300) includes a first inclined surface (301) and a second inclined surface (302) that are fixedly connected to the sheath (200).

7. The cable for an energy storage system according to claim 1, characterized in that: The transverse groove (400) and the longitudinal groove (300) are perpendicularly intersecting each other. The depth of the transverse groove (400) is the same as the depth of the longitudinal groove (300), and the transverse groove (400) is rectangular.

8. The cable for an energy storage system according to claim 1, characterized in that: The heat dissipation mechanism (500) includes a heat dissipation box (501) located in the transverse groove (400). The heat dissipation box (501) has air vents (502) on both sides. The air vents (502) correspond to and are connected to the longitudinal grooves (300).

9. The cable for an energy storage system according to claim 8, characterized in that: The heat sink (501) is fixedly installed with a heat sink fan inside, and both ends of the heat sink (501) are provided with notches and grooves that are adapted to the elastic fastener (201).

10. An energy storage system method, applied to the cable for the energy storage system according to any one of claims 1-9, characterized in that, The energy storage system includes an energy storage box (600) and bolts disposed inside the energy storage box (600), wherein the energy storage box (600) is connected to the sheath (200) as described in claim 1 and the inner wall of the storage system by bolts.

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