Multi-core cable

Abstract

The invention relates to the technical field of cables, in particular to a multi-core cable which comprises a battery cell body which at least comprises a first conductive core, a second conductive core and a third conductive core. The first conductive core, the second conductive core and the third conductive core are composed of flexible middle cores and a plurality of wire cores in the longitudinal cross section perpendicular to the first conductive core, the second conductive core and the third conductive core, the periphery of the battery core body is further flexibly connected with a deformation bearing strip, and the periphery of the deformation bearing strip is wrapped with a tightening jacket. Through cooperation of the deformation bearing strip and the tightening outer sleeve, multi-angle deformation of the whole cable is achieved, damage to a cable cell in the deformation process is guaranteed, and the service life is prolonged; and meanwhile, through the matching of the filling core filled with the hydrated salt and the heat conduction channel overlapped with the adjacent first conductive core, the self-adaptive temperature adjustment of the interior of the multi-core battery core in an external high-temperature environment is realized, and the service life of the multi-core battery core in different use scenes is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of cables, and in particular to a multi-core cable. Background Art

[0002] With the continuous increase in the demand for power and signal transmission in modern society, multi-core cables are widely used in many fields. However, traditional multi-core cables have significant defects in their structural design. On the one hand, mutual interference is likely to occur between the core wires, resulting in poor signal transmission stability; on the other hand, the cable has insufficient flexibility, and the core wires are extremely vulnerable to damage during the bending process. In addition, in the face of some special scenarios, existing multi-core cables are difficult to meet the actual use requirements in terms of fire resistance, waterproofness, and electromagnetic interference resistance. These problems greatly restrict the in-depth application of multi-core cables in complex environments and high-end technology fields.

[0003] The existing publication number is CN215496054U, and the name is a novel flexible mineral insulated fireproof cable, which discloses a flexible center core and a number of core wires. The flexible center core is coated with a first inorganic material insulation layer, and the core wires are coated with a second inorganic material insulation layer; a number of first fine copper wires are coaxially arranged in the flexible center core, and the core wires are formed by stranding a number of second fine copper wires. The gap between a number of first fine copper wires is larger than the gap between a number of second fine copper wires; the conductive core is coated with an isolation layer, and a number of arc-shaped protrusions coaxial with it for fixing the position of the core wires are arranged on the isolation layer. An inorganic material filling layer is arranged between the isolation layer and the core wires, an armor layer is arranged outside the isolation layer, a fireproof layer is arranged outside the armor layer, and a flexible soft sheath is arranged outside the fireproof layer.

[0004] The foregoing technical solution solves the problem that the existing cable structure is extremely likely to cause damage to the core wires, but the influence of factors such as fire resistance, waterproofness, and electromagnetic interference resistance has not been solved. Summary of the Invention

[0005] The inventor found through research that: existing multi-core cables generally focus on the problem of fire protection or overheat protection from the inside out, but ignore how to effectively control the temperature of the internal battery cells reasonably when the external temperature is relatively high, which results in a short service life of multi-core cables in many application scenarios.

[0006] The purpose of the present invention is to provide a multi-core cable, through the cooperation of a deformation bearing strip and a tightening outer sleeve, to solve the technical problem that the prior art cannot provide a multi-core cable with a long service life.

[0007] According to one aspect of the present invention, there is provided a multi-core cable, including a core body, wherein the core body at least includes a first conductive core, a second conductive core, and a third conductive core which are arranged at intervals in a ring shape. The first conductive core, the second conductive core, and the third conductive core are composed of a flexible core and a plurality of wire cores in a longitudinal cross-section perpendicular to the longitudinal directions of the first conductive core, the second conductive core, and the third conductive core. A deformation-bearing strip is flexibly connected to the outer periphery of the core body, and a tightening outer sleeve is wrapped around the outer periphery of the deformation-bearing strip.

[0008] In some embodiments, the core body further includes a filling core arranged at the central position of the core body, and the filling core is at least filled with hydrated salt.

[0009] In some embodiments, the core body further includes a heat conduction channel arranged in a ring shape on the inner wall of the core body, and the heat conduction channel overlaps with the adjacent first conductive core.

[0010] In some embodiments, the proportion of the overlapping arrangement is at least 12%.

[0011] In some embodiments, the heat conduction channel is filled with mineral oil.

[0012] In some embodiments, aerogel is filled between the inner wall and the outer wall of the core body.

[0013] In some embodiments, the deformation-bearing strip is a chain structure and includes multiple groups of chain links. A pin shaft is rotatably connected between two adjacent chain links, and each chain link deforms in cooperation with the core body.

[0014] In some embodiments, a resin tape is spirally wound around the outer periphery of the core body.

[0015] In some embodiments, a casing coated with an aluminum-based reflective film is sleeved on the outer periphery of the tightening outer sleeve.

[0016] In some embodiments, the material of the casing is composite rubber.

[0017] Compared with the prior art, the present invention has the following beneficial effects: By focusing on the structure of the existing multi-core cable, the present invention optimizes the internal connection structure of the cable. Specifically, through the cooperation of the deformation-bearing strip and the tightening outer sleeve, multi-angle deformation of the whole cable is realized, and at the same time, damage to the cable core during the deformation process is ensured, and the service life is extended. At the same time, through the cooperation of the filling core filled with hydrated salt and the heat conduction channel overlapping with the adjacent first conductive core, adaptive temperature regulation inside the multi-core core under an external high-temperature environment is realized, and the electrical service life of the multi-core under different usage scenarios is extended. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 is an axonometric schematic diagram of the multi-core cable of the present invention;

[0020] Figure 2 is an internal structure schematic diagram of the multi-core cable of the present invention;

[0021] Figure 3 is a schematic diagram of the deformation-bearing strip structure of the multi-core cable of the present invention;

[0022] Figure 4 is a front view of the deformation-bearing strip of the multi-core cable of the present invention;

[0023] Figure 5 is an internal structure schematic diagram and a partial enlarged view of the multi-core cable of the present invention.

[0024] In the figure: 1 - sheath; 2 - tightening outer sheath; 3, 4, 7 - resin tapes; 5 - core body; 51 - aerogel; 52 - first conductive core; 53 - heat conduction channel; 54 - second conductive core; 55 - third conductive core; 56 - filling core; 6 - deformation-bearing strip; 61 - pin shaft; 62 - link; In Figures 1-5 the figure, some leads are dashed lines to avoid interference with technical features. Detailed implementation manners

[0025] The following will combine the attached Figures 1-5 in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments.

[0026] Embodiment 1

[0027] Figure 1 is an axonometric schematic diagram of the multi-core cable provided by the embodiment of the present invention, which includes a core body 5. Refer to Figure 5, the battery cell body 5 at least includes a first conductive core 52, a second conductive core 54, and a third conductive core 55 that are arranged at intervals in a ring shape. It can be understood that the intervals mean there is a certain distance between the first conductive core 52 and the second conductive core 54, and there is a certain distance between the second conductive core 54 and the third conductive core 55; the ring arrangement means that the first conductive core 52, the second conductive core 54, and the third conductive core 55 are all arranged in a ring around the center of the battery cell body 5. At the same time, in the longitudinal or transverse cross-section perpendicular to the battery cell body 5, the first conductive core 52, the second conductive core 54, and the third conductive core 55 are arranged in layers, that is, the circumference where the second conductive core 54 is located is arranged inside the circumference where the first conductive core 52 is located, and the circumference where the third conductive core 55 is located is arranged inside the circumference where the second conductive core 54 is located. The first conductive core 52, the second conductive core 54, and the third conductive core 55 are composed of a flexible core and a plurality of wire cores in the longitudinal cross-section perpendicular to the first conductive core 52, the second conductive core 54, and the third conductive core 55.

[0028] Furthermore, a deformation bearing strip 6 is flexibly connected to the outer periphery of the battery cell body 5, and a tightening outer sleeve 2 is wrapped around the outer periphery of the deformation bearing strip 6. It can be understood that the deformation bearing strip 6 and the tightening outer sleeve 2 cooperate to form a wrapping sleeve for the battery cell body 5. When the battery cell body 5 is bent, the deformation bearing strip 6 will preferentially bear the bending stress and then undergo bending deformation. In other words, the bending does not directly act on the battery cell body 5. At the same time, the deformation bearing strip 6 can increase the tensile strength in the horizontal or vertical direction. In some possible implementation manners, referring to Figures 3-4 , the deformation bearing strip 6 is a flexible strip or a chain structure. In this implementation, it is preferably a chain structure, which includes multiple groups of chain links 62. A pin shaft 61 is rotatably connected between adjacent two chain links 62. When subjected to an external force, the adjacent chain links 62 will rotate through the pin shaft 61 to adapt to the bending deformation, thereby reducing the degree of bending damage of the battery cell body 5.

[0029] In some possible implementation manners, the battery cell body 5 also includes a filling core 56 arranged at the central position of the battery cell body 5, and at least a hydrated salt is filled inside the filling core 56. It should be noted that the hydrated salt is a phase change material. When the external heat in the environment where the cable is located is introduced, the hydrated salt absorbs heat and melts to store heat, delaying the rise of the temperature inside the cable; when the external temperature of the cable drops, the hydrated salt solidifies, thereby releasing heat, realizing the balance of the temperature inside and outside the cable, and indirectly realizing passive temperature control, so as to ensure that the cable of the present invention can be used for a long time under any reasonable temperature conditions.

[0030] In some possible embodiments, the battery cell body 5 further includes a heat conduction channel 53 provided around the inner wall of the battery cell body 5, and the heat conduction channel 53 is arranged overlapping with the adjacent first conductive core 52. It should be noted that the first conductive core 52 is located on the outermost side of the battery cell and is also the conductive core that needs to be in contact with or sense the external temperature first. Therefore, in order to improve the temperature balance of the first conductive core 52 and prevent overheating or overcooling from affecting the use, an immersion cooling method is adopted in this embodiment, that is, part of the first conductive core 52 is immersed in the heat conduction channel 53. The heat conduction channel 53 is semi-open, and the heat conduction channel 53 is filled with mineral oil. Specifically, the material at the position where the heat conduction channel 53 contacts the first conductive core 52 is a material with a relatively high thermal conductivity. In this embodiment, it is preferably steel.

[0031] The first conductive core 52 is in the mineral oil, and uses the latent heat of vaporization of the liquid to achieve efficient heat dissipation. The latent heat of vaporization refers to the heat required for a substance to change from a liquid state to a gaseous state at a given pressure. Further, part of the first conductive core 52 is immersed in the heat conduction channel 53, and the partial immersion is partial overlap. In this embodiment, the set overlap ratio is at least 12%, and this ratio can have the maximum fire resistance time through actual experiments.

[0032] In some possible embodiments, an aerogel 51 is filled between the inner wall and the outer wall of the battery cell body 5. It can be understood that the setting of the aerogel 51 realizes the outermost layer of insulation, heat insulation and heat dissipation. Of course, high-temperature resistant materials such as silicone rubber and polytetrafluoroethylene (PTFE) can also be used to delay insulation aging and indirectly reduce the temperature increase rate.

[0033] Embodiment 2

[0034] Based on the same inventive concept as the multi-core cable in the first embodiment, the same technical features and technical solutions will not be described in detail here. Only the differences between the second embodiment and the first embodiment will be described here. Refer to Figure 1 , resin tapes 3, 4, 7 are spirally wound around the outer circumference of the battery cell body 5. Among them, the angle of the winding direction of the resin tapes 3, 4, 7 relative to the winding direction of the outer circumference of the battery cell body 5 is preferably more than 22° and less than 70° in this embodiment. In some possible embodiments, a housing 1 coated with an aluminum-based reflective film is sleeved on the outer circumference of the tightening jacket 2, and the material of the housing 1 is composite rubber. It can be understood that the housing 1 can also be a nano-level coating, and their purpose is to reflect the external radiant heat and reduce heat absorption.

[0035] Based on the foregoing content, the present invention verifies the performance advantages of the cable of the present invention through experimental tests, and the test conditions are all carried out according to standards such as GB / T 18380-2008 and IEC 60332-3.

[0036] Specific comparison:

[0037] As shown in the following table:

[0038] Test Items Traditional Cable Cable of the Present Invention Lifting Amplitude Transmission Signal Attenuation Rate 8.5 dB / km 2.1 dB / km 75.3％ Minimum Bending Radius 12D 6D 50.0％ Fire Resistance Time 30 minutes 90 minutes 200.0％ Horizontal Tensile Strength 15 MPa 28 MPa 86.7％ Vertical Tensile Strength 12 MP 23 MP 91.7％

[0039] As can be seen from the above table, the multi-core cable of the present invention can well adapt to the use in different environments and can effectively increase the service life.

[0040] The above shows and describes the basic principles, main features and advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic features of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be construed as limiting the claimed invention.

[0041] In addition, it should be understood that although this specification is described according to the embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A multi-core cable, comprising a core body (5), wherein the core body (5) at least includes a first conductive core (52), a second conductive core (54), and a third conductive core (55) that are arranged at intervals in a ring shape. The first conductive core (52), the second conductive core (54), and the third conductive core (55) are composed of a flexible core and a plurality of wire cores in a longitudinal cross-section perpendicular to the longitudinal directions of the first conductive core (52), the second conductive core (54), and the third conductive core (55). It is characterized in that, A deformation bearing strip (6) is also flexibly connected to the outer periphery of the battery cell body (5), and a tightening outer sleeve (2) is wrapped around the outer periphery of the deformation bearing strip (6).

2. The cable according to claim 1, characterized in that, The battery cell body (5) further includes a filling core (56) disposed at the central position of the battery cell body (5), and at least a hydrated salt is filled inside the filling core (56).

3. The cable according to claim 2, characterized in that, The battery cell body (5) further includes a heat conduction channel (53) provided around the inner wall of the battery cell body (5), and the heat conduction channel (53) is overlapped with the adjacent first conductive core (52).

4. The cable according to claim 3, wherein, The proportion of the overlapping arrangement is at least 12%.

5. The cable according to claim 4, wherein, Mineral oil is filled in the heat conduction channel (53).

6. The cable according to claim 1, characterized in that, Aerogel (51) is filled between the inner wall and the outer wall of the battery cell body (5).

7. The cable according to claim 1, characterized in that, The deformation bearing strip (6) is of a chain structure and includes a plurality of groups of chain links (62). A pin shaft (61) is rotatably connected between two adjacent chain links (62), and each of the chain links (62) deforms in cooperation with the battery cell body (5).

8. The cable according to claim 1, characterized in that, Resin tapes (3, 4, 7) are spirally wound around the outer periphery of the battery cell body (5).

9. The cable according to any one of claims 1 to 8, characterized in that, A housing (1) coated with an aluminum-based reflective film is sleeved on the outer periphery of the tightening outer sleeve (2).

10. The cable according to claim 9, characterized in that, The material of the housing (1) is composite rubber.

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