Multi-strand direct current cable for charging

Abstract

The utility model relates to a multi-strand direct current cable for charging, which comprises a sheath layer and a belting layer from outside to inside in sequence, a shielding wire core, a ground wire core, an auxiliary power wire core and a plurality of signal wire cores are arranged in the belting layer, and a filling layer is filled in the belting layer. At least three positive wire cores and at least three negative wire cores are also arranged in the belting layer; the shielding wire core, the auxiliary power wire core and the plurality of signal wire cores are arranged along the inner side of the belting layer and are used for filling gaps between the positive wire cores and the belting layer as well as between the negative wire cores and the belting layer; the beneficial effects of the utility model are that the power wire cores are divided into a plurality of strands, and the gaps between the power wire cores and the belting layer are filled with other wire cores, so that the internal space of the cable can be fully utilized from the wire core arrangement, and the outer diameter of a finished product can be reduced; and the cost can be saved while the weight is reduced.

Description

Technical Field

[0001] The utility model belongs to the field of cables, and in particular relates to a multi-strand DC cable for charging. Background Art

[0002] With the vigorous development of "new infrastructure", the construction focus of the new energy electric vehicle industry is gradually shifting to the improvement of infrastructure, among which the construction of charging pile networks is particularly critical. As a core component of this field, DC fast charging cables dedicated to electric vehicles play an indispensable role. At present, the fast charging piles of the State Grid have achieved a power output of up to 120kW, which is inseparable from the support of cables that can withstand 250A current. This cable is widely used in the market and has won wide acclaim from electric vehicle owners for its efficient charging speed, excellent reliability and excellent safety. The country's strong support for the construction of charging piles not only provides a strong impetus for the rapid development of new energy vehicles, but also indicates that the new energy vehicle industry will be more prosperous in the future.

[0003] The charging cables used in the existing 120KW charging piles on the market have an output current of 250A and a length of about 7.5 meters. The main specifications of the power core of these cables are 2×70mm 2 , with an outer diameter of about 36mm and a weight of about 2.3kg per meter. Another newer design is 4×35mm 2 The two-core power line parallel cable has an outer diameter of about 31mm and a weight of about 2.07kg per meter, which is optimized in both outer diameter and weight compared with the former. However, one problem that cannot be ignored is that since many new energy vehicle owners are mainly women, they often feel laborious when moving these charging guns during charging, which seriously affects their charging experience and leads to low utilization rate of DC fast charging piles at the station. Utility Model Content

[0004] In order to improve the problem of heavy cables, the utility model provides a multi-strand DC cable for charging, and the specific technical solution is as follows:

[0005] A multi-strand DC cable for charging comprises a sheath layer and a tape layer from outside to inside, wherein a shielding core, a ground core, an auxiliary power core and a plurality of signal cores are arranged in the tape layer, the tape layer is filled with a filling layer, and at least three positive electrode cores and at least three negative electrode cores are also arranged in the tape layer, wherein the shielding core, the auxiliary power core and the plurality of signal cores are arranged along the inner side of the tape layer and are used to fill the gap between the positive electrode core, the negative electrode core and the tape layer.

[0006] The ground wire core is located in the center of the tape layer, and at least three of the positive electrode wire cores are composed of seven 8mm 2Positive wire core and a 4mm 2 The positive electrode core is composed of at least three of the negative electrode cores, which are composed of seven 8mm 2 Negative wire core and a 4mm 2 Negative electrode core, seven 8mm 2 Positive wire core and a 4mm 2 Positive electrode core and seven 8mm 2 Negative wire core and a 4mm 2 The negative electrode wire core is symmetrically arranged around the axis center of the ground wire core.

[0007] The auxiliary power supply wire core and the shielding wire core are both arranged in contact with the inner side wall of the tape layer and fill the gap at the edge of the tape layer.

[0008] At least two of the signal wire cores constitute a signal wire group, and the signal wire group is arranged close to one side of the inner side wall of the tape wrap layer. There are four signal wire groups, of which two groups of the signal wire groups are arranged adjacent to each other and close to one side of the inner side wall of the tape wrap layer.

[0009] By changing the mainstream power line core specification on the market to 2×70mm 2 or 4×35mm 2 Split into seven 8mm 2 Positive wire core, one 4mm 2 Positive wire core, seven 8mm 2 Negative wire core, one 4mm 2 The negative core is to split the power core into multiple strands, and fill the gap between the positive core and the negative core and the tape layer with shielding cores, ground cores, auxiliary power cores and several signal cores, so that the space inside the tape layer can be fully utilized from the core arrangement. The outer diameter of the finished cable can be compared with the original 2×70mm 2 The outer diameter of the structural cable is reduced by about 28%; it is also smaller than the original 4×35mm 2 The outer diameter of the structural cable is reduced by about 14%; relatively speaking, the weight per meter of cable is reduced by about 23% and 13% respectively; the charging experience is greatly improved while saving a lot of costs.

[0010] In a specific possible implementation manner, the positive electrode core, the negative electrode core, the shielding core, the ground core, the auxiliary power core and the plurality of signal cores all include a conductor core wire and a FEP layer covering the conductor core wire.

[0011] The FEP layer, i.e., perfluoroethylene propylene copolymer, is temperature resistant (-200 to 200°C). The higher temperature resistance improves the safety of the cable, reduces the life loss of the insulation layer caused by the long-term heat release of the conductor during the charging process, and greatly increases the service life of the cable.

[0012] In a specific possible implementation manner, a single-sided aluminum foil wrapping layer and a tinned copper wire braiding layer are sequentially provided on the outer side of the FEP layer of the shielded wire core.

[0013] The single-sided aluminum foil wrapping layer can reflect and absorb electromagnetic waves, reducing the impact of external electromagnetic interference on internal signals. At the same time, the aluminum foil can also play a certain role in heat insulation; the tinned copper wire braided layer is used to further enhance the electromagnetic shielding effect. The tinned copper wire braided layer can provide higher shielding effectiveness and has good conductivity and corrosion resistance.

[0014] In a specific possible implementation manner, the filling layer is a polypropylene mesh fiber filling layer; the wrapping layer is a non-woven fabric wrapping layer; and the sheath layer is a TPU sheath layer.

[0015] The utility model has the following beneficial technical effects: by splitting the power line core into multiple strands, the space inside the cable can be fully utilized from the core line arrangement, and the outer diameter of the finished cable can be reduced to 2×70mm compared to the original 2 The outer diameter of the structural cable is reduced by about 28%; it is also smaller than the original 4×35mm 2 The outer diameter of the structural cable is reduced by about 14%; relatively speaking, the weight per meter of cable is reduced by about 23% and 13% respectively, which can reduce the weight of the cable and improve the user's charging experience; in addition, by filling the cable with multiple power cores, the core distribution inside the cable is more even, the structure is more stable, the flexibility is better, and the internal stress is more evenly dispersed and the stress is smaller when the cable is bent during movement. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of a multi-strand DC cable for charging according to an embodiment of the utility model.

[0017] Explanation of the accompanying drawings: 1. Sheath layer; 2. Tape layer; 3. Shielding core; 4. Ground core; 5. Auxiliary power core; 6. Signal core; 7. Filling layer; 8. Positive core; 9. Negative core; 10. Conductor core wire; 11. FEP layer; 12. Single-sided aluminum foil wrapping layer; 13. Tinned copper wire braided layer. DETAILED DESCRIPTION

[0018] The following is combined with Figure 1 The utility model is described in further detail.

[0019] Reference Figure 1A multi-strand DC cable for charging, comprising, from the inside to the outside, a power core, a shielding core 3, a ground core 4, an auxiliary power core 5, eight signal cores 6, a filling layer 7, a tape layer 2 and a sheath layer 1. The power core includes at least three positive electrode cores 8 and at least three negative electrode cores 9. The shielding core 3, the auxiliary power core 5 and a plurality of signal cores 6 are arranged along the inner side of the tape layer 2 and are used to fill the gap between the positive electrode core 8 and the negative electrode core 9 and the tape layer.

[0020] In this embodiment, at least three positive electrode cores 8 and at least three negative electrode cores 9 are specifically: seven 8 mm 2 Positive wire core, one 4mm 2 Positive wire core, seven 8mm 2 Negative wire core and a 4mm 2 Negative pole core; eight signal cores 6.

[0021] The ground wire core 4 is located in the center of the cable, seven 8mm 2 Positive wire core and a 4mm 2 Positive electrode core and seven 8mm 2 Negative wire core and a 4mm 2 The negative electrode core is symmetrically arranged around the axis center of the ground core 4 .

[0022] The auxiliary power supply core 5 and the shielding core 3 are both attached to the inner wall of the tape layer 2 and fill the gap between the positive electrode core 8 , the negative electrode core 9 and the tape layer 2 .

[0023] The specific arrangement of the eight signal wire cores 6 is: two of the signal wire cores 6 constitute a signal wire group, that is, four signal wire groups are constituted, and two of the signal wire groups are arranged adjacent to each other, and two of the signal wire groups fill the gap between the positive electrode wire core 8 and the wrapping layer 2, and the other two signal wire groups fill the gap between the negative electrode wire core 9 and the wrapping layer 2.

[0024] The positive electrode core 8, the negative electrode core 9, the shielding core 3, the ground core 4, the auxiliary power core 5 and the plurality of signal cores 6 all include a conductor core 10 and an FEP layer 11 covering the conductor core 10; wherein the outer side of the FEP layer 11 of the shielding core 3 is also provided with a single-sided aluminum foil wrapping layer 12 and a tinned copper wire braiding layer 13 in sequence.

[0025] The filling layer 7 is a polypropylene mesh fiber filling layer; the wrapping layer 2 is a non-woven fabric wrapping layer; and the sheath layer 1 is a TPU sheath layer.

[0026] The above are all preferred embodiments of the present utility model, and are not intended to limit the protection scope of the present utility model. Therefore, any equivalent changes made based on the structure, shape, and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A multi-strand DC cable for charging, comprising a sheath layer (1) and a tape layer (2) from outside to inside, wherein a shielding core (3), a ground core (4), an auxiliary power core (5) and a plurality of signal cores (6) are arranged in the tape layer (2), and a filling layer (7) is filled in the tape layer (2), characterized in that: At least three positive electrode cores (8) and at least three negative electrode cores (9) are also arranged in the tape layer (2); the shielding core (3), the auxiliary power core (5) and a plurality of signal cores (6) are arranged along the inner side of the tape layer (2) and are used to fill the gap between the positive electrode core (8) and the negative electrode core (9) and the tape layer (2).

2. A multi-strand DC cable for charging according to claim 1, characterized in that: At least three of the positive electrode wire cores (8) are composed of seven 8mm 2 Positive wire core and a 4mm 2 The positive electrode wire core is composed of at least three negative electrode wire cores (9) consisting of seven 8mm 2 Negative wire core and a 4mm 2 Negative electrode core.

3. A multi-strand DC cable for charging according to claim 2, characterized in that: The ground wire core (4) is located at the center of the tape layer (2), and has seven 8mm 2 Positive wire core and a 4mm 2 Positive electrode core and seven 8mm 2 Negative wire core and a 4mm 2 The negative electrode wire core is symmetrically arranged around the axis center of the ground wire core.

4. A multi-strand DC cable for charging according to claim 1, characterized in that: At least two of the signal wire cores (6) form a signal wire group, and the signal wire group is arranged close to one side of the inner side wall of the tape wrapping layer (2).

5. A multi-strand DC cable for charging according to claim 4, characterized in that: There are four groups of signal lines, and any two groups of signal line groups are arranged adjacent to each other and are arranged close to one side of the inner side wall of the tape wrapping layer (2).

6. A multi-strand DC cable for charging according to claim 1, characterized in that: The auxiliary power supply core (5) and the shielding core (3) are both arranged in contact with the inner side wall of the tape layer (2) and fill the gap at the edge of the tape layer (2).

7. A multi-strand DC cable for charging according to claim 1, characterized in that: The positive electrode core (8), the negative electrode core (9), the shielding core (3), the ground core (4), the auxiliary power core (5) and the plurality of signal cores (6) all include a conductor core (10) and an FEP layer (11) covering the conductor core (10).

8. The multi-strand DC cable for charging according to claim 1, characterized in that: A single-sided aluminum foil wrapping layer (12) and a tinned copper wire braiding layer (13) are sequentially provided on the outside of the FEP layer (11) of the shielded wire core (3).

9. The multi-strand DC cable for charging according to claim 1, characterized in that: The filling layer (7) is a polypropylene mesh fiber filling layer; the wrapping layer (2) is a non-woven fabric wrapping layer; and the sheath layer (1) is a TPU sheath layer.

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