Connecting cable for battery energy storage

Abstract

The utility model discloses a connecting cable for battery energy storage, which comprises a fifth type conductor formed by twisting tinned copper wires, an insulating layer extruded outside the conductor, an elastic sheath layer extruded outside the insulating layer, and a plurality of ribs arranged at equal angles on the outer circumferential surface of the insulating layer by taking the center of the conductor as a circle center, the insulating layer and the sheath layer are arranged on the outer circumferential surface of the elastic sheath layer, so that the joint surface of the insulating layer and the sheath layer is gear-shaped on the radial cross section of the cable, the ribs are semicircular cross-section ribs, semicircular cross-section grooves are arranged between the adjacent semicircular cross-section ribs, and a plurality of protective ribs are arranged on the outer circumferential surface of the elastic sheath layer by taking the center of the conductor as the center of a circle at equal angles. The insulating layer and the sheath layer of the connecting cable for battery energy storage are firmly connected, the insulating layer and the sheath layer cannot be separated when the connecting cable is in a small-radius bending state for a long time, and the connecting cable has good bending performance and heat dissipation performance and can meet the use requirement of serving as a direct current side connecting cable in a battery energy storage system.

Description

Technical Field

[0001] The utility model relates to a DC cable, in particular to a connecting cable used for connecting a battery pack on the DC side of a battery energy storage system. Background Art

[0002] Since the power generation of wind power and solar power is affected by climate change, in order to reduce the fluctuation of the power input to the power grid, energy storage devices are needed to store and regulate the electric energy. Battery energy storage is the most commonly used energy storage method, with the advantages of high conversion efficiency, low energy loss and high energy density. In the battery energy storage system, 1500V or 1000V DC connecting cables are needed to connect the battery modules and battery modules, battery clusters and battery clusters, battery clusters and junction boxes, and battery clusters and energy storage converters on the DC side. Due to the particularity of the working environment of the connecting cable, the cable is required to work for a long time in a small radius bending state, and the insulation and sheath need to meet the working temperature of the conductor of 90-150 degrees Celsius and the external working environment of -40-60 degrees Celsius. Therefore, the connecting cable needs to have good bending performance and heat dissipation performance to ensure that the insulation layer and the sheath layer of the connecting cable will not separate when the connecting cable is in the minimum bending radius state for a long time. In addition, due to the small working space of the connecting cable, it is easy to cause mechanical damage to the sheath layer during the construction process, and the damaged sheath layer is very easy to break at the damaged location, forming a serious safety hazard. Utility Model Content

[0003] The technical problem to be solved by the utility model is: to provide a connecting cable for battery energy storage, the insulation layer and the sheath layer of the connecting cable for battery energy storage are firmly connected, the insulation layer and the sheath layer will not separate when in a small radius bending state for a long time, it has good bending performance and heat dissipation performance, and can meet the use requirements of the DC side connecting cable in the battery energy storage system.

[0004] The technical solution adopted to solve the technical problem: A connecting cable for battery energy storage, including a fifth type conductor twisted from tinned copper wires, an insulating layer extruded outside the conductor, an elastic sheath layer extruded outside the insulating layer, and a plurality of convex ridges arranged at equal angles on the outer circumferential surface of the insulating layer with the center of the conductor as the center of the circle, so that the bonding surface of the insulating layer and the sheath layer is gear-shaped on the radial cross-section of the cable.

[0005] As a further improvement of the present utility model: the convex ridges are convex ridges with semicircular cross-sections, and semicircular cross-section grooves are provided between adjacent semicircular cross-section ridges.

[0006] As a further improvement of the utility model: a plurality of protective ribs are arranged at equal angles on the outer circumferential surface of the elastic sheath layer with the center of the conductor as the center of the circle.

[0007] As a further improvement of the utility model: a plurality of protective ribs are arranged in a multi-start spiral on the outer circumferential surface of the elastic sheath layer.

[0008] As a further improvement of the utility model: a plurality of convex ridges are arranged in a multi-start spiral on the outer circumferential surface of the insulating layer.

[0009] As a further improvement of the utility model, the protective ribs on the outer circumferential surface of the elastic sheath layer and the ridges on the outer circumferential surface of the insulating layer have opposite rotation directions.

[0010] As a further improvement of the utility model: the radius of the semicircular cross-section ridge is equal to the radius of the semicircular cross-section groove.

[0011] As a further improvement of the present utility model: the protective rib is a semicircular cross-section protective rib, and the cross-sectional radius of the protective rib is smaller than one eighth of the radius of the elastic sheath layer.

[0012] Beneficial effect: The battery energy storage connection cable of the utility model adopts a fifth type conductor made of tinned copper wires, an insulating layer is extruded outside the conductor, an elastic sheath layer is extruded outside the insulating layer, and a plurality of ridges are arranged at equal angles with the center of the conductor as the center of the circle on the outer circumferential surface of the insulating layer, so that the joint surface of the insulating layer and the sheath layer is gear-shaped on the radial cross section of the cable. The technical solution increases the contact area between the insulating layer and the sheath layer. On the one hand, it can prevent the insulation layer and the sheath layer from separating when bending at a small angle, and on the other hand, it can improve the heat transfer performance between the insulating layer and the sheath layer, so that the heat of the conductor can be transferred outward in time, which is beneficial to the heat dissipation and cooling of the conductor. Therefore, the battery energy storage connection cable of the utility model can meet the requirements of the battery energy storage system for the connection cable. Due to the technical feature that the ridge is a semicircular cross-section ridge, and a semicircular cross-section groove is provided between adjacent semicircular cross-section ridges, not only the contact area between the insulating layer and the sheath layer is further increased, but also the disadvantage that the root of the ridge is difficult to be seamlessly filled with the sheath layer material and a cavity is formed at the root of the ridge is avoided. Due to the technical feature of arranging multiple protective ribs at equal angles with the center of the conductor as the center of the circle on the outer circumference of the elastic sheath layer, the protective ribs outside the sheath layer are used to reinforce the sheath layer, thereby improving the crack resistance of the sheath layer, so that the outer sheath layer will not break even if it is in a small radius bending state for a long time in a low-temperature environment. In addition, the protective ribs can also prevent mechanical damage to the sheath layer matrix during construction operations and form safety hazards, thereby improving the extrusion and collision resistance of the connecting cable. Due to the technical feature of multiple protective ribs arranged in a multi-head spiral on the outer circumference of the elastic sheath layer, the protective ribs have a better protective effect on the sheath matrix, and the cable has better heat dissipation performance. Due to the technical feature of multiple ridges arranged in a multi-head spiral on the outer circumference of the insulation layer, relative displacement between the insulation layer and the sheath layer in the direction of the cable axis can be effectively prevented, further improving the bonding strength between the insulation layer and the sheath layer. Due to the technical feature that the protective ribs on the outer circumferential surface of the elastic sheath layer and the ridges on the outer circumferential surface of the insulation layer rotate in opposite directions, the twisting of the cable during the bending process caused by the use of spiral protective ribs and ridges can be avoided, making the cable construction operation more convenient. Due to the technical feature that the radius of the semicircular cross-section ridge is equal to the radius of the semicircular cross-section groove, the extrusion effect of the insulation layer during the cable production process is better, the outer surface of the insulation layer is smoother, and the ridges on the surface of the insulation layer will not deform after cooling. Due to the reasonable limitation of the cross-sectional shape of the protective ribs and the ratio to the radius of the sheath layer, when the outer diameter of the connecting cable of the utility model is ≤25mm, the minimum working bending radius reaches 4D, and when the outer diameter of the cable is >25mm, the minimum working bending radius reaches 6D, which meets the bending performance requirements of the connecting cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The battery energy storage connection cable of the utility model is further described in detail below in conjunction with the accompanying drawings.

[0014] Figure 1 It is a schematic diagram of the radial cross-section structure of the battery energy storage connection cable of the utility model;

[0015] Figure 2 It is a three-dimensional structural schematic diagram of the battery energy storage connection cable of the utility model. DETAILED DESCRIPTION

[0016] like Figure 1 As shown, the utility model of the connecting cable for battery energy storage comprises a fifth type conductor 1 twisted by tinned copper wires, an insulating layer 2 is extruded outside the conductor, an elastic sheath layer 3 is extruded outside the insulating layer, a plurality of convex ridges 21 are arranged at equal angles with the center of the conductor as the center of the circle on the outer circumferential surface of the insulating layer, so that the joint surface of the insulating layer and the sheath layer is gear-shaped on the radial cross-section of the cable, a plurality of protective ribs 31 are arranged at equal angles with the center of the conductor as the center of the circle on the outer circumferential surface of the elastic sheath layer, the protective ribs are semicircular cross-section protective ribs, the radius r of the semicircular cross-section protective ribs is less than one eighth of the radius R of the elastic sheath layer, and the radius of the elastic sheath layer refers to the outer diameter of the sheath layer substrate, that is, the outer diameter of the circular substrate where the sheath layer has no protective ribs.

[0017] Preferably, the ridges are ridges with semicircular cross-sections, and a semicircular cross-section groove 22 is provided between adjacent semicircular cross-section ridges, and the radius of the semicircular cross-section ridge is equal to the radius of the semicircular cross-section groove.

[0018] Preferably, if Figure 2 As shown, a plurality of protective ribs are arranged in a multi-start spiral on the outer circumferential surface of the elastic sheath layer.

[0019] Preferably, if Figure 2 As shown, a plurality of ridges are arranged in a multi-start spiral on the outer circumferential surface of the insulating layer, and the protective ribs on the outer circumferential surface of the elastic sheath layer have opposite spiral directions to the ridges on the outer circumferential surface of the insulating layer.

[0020] The utility model relates to a connecting cable for battery energy storage, wherein the sheath layer is made of special silicone rubber or cross-linked elastomer material, and the insulation layer is made of low-smoke halogen-free flame-retardant cross-linked polyolefin material.

Claims

1. A battery energy storage connection cable, comprising a fifth-category conductor twisted from tinned copper wires, with an insulating layer extruded outside the conductor, characterized in that: An elastic sheath layer is extruded outside the insulating layer, and a plurality of convex ridges are arranged at equal angles on the outer circumferential surface of the insulating layer with the center of the conductor as the center, so that the joint surface of the insulating layer and the sheath layer is gear-shaped on the radial section of the cable.

2. The battery energy storage connection cable according to claim 1, characterized in that: The ridges are ridges with semicircular cross sections, and semicircular cross section grooves are arranged between adjacent ridges with semicircular cross sections.

3. The battery energy storage connection cable according to claim 2, characterized in that: A plurality of protective ribs are arranged at equal angles on the outer circumferential surface of the elastic sheath layer with the center of the conductor as the center of the circle.

4. The battery energy storage connection cable according to claim 3, characterized in that: A plurality of protective ribs are arranged in a multi-head spiral on the outer circumferential surface of the elastic sheath layer.

5. The battery energy storage connection cable according to claim 4, characterized in that: A plurality of convex ridges are arranged in a multi-start spiral on the outer circumference of the insulating layer.

6. The battery energy storage connection cable according to claim 5, characterized in that: The protective ribs on the outer circumferential surface of the elastic sheath layer and the convex ridges on the outer circumferential surface of the insulating layer have opposite rotation directions.

7. The battery energy storage connection cable according to claim 3, characterized in that: The radius of the semicircular cross-section ridge is equal to the radius of the semicircular cross-section groove.

8. The battery energy storage connection cable according to claim 7, characterized in that: The protective ribs are semicircular cross-section protective ribs, and the cross-section radius of the protective ribs is less than one eighth of the radius of the elastic sheath layer.

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