A high-power direct-current charging cooling cable and a charging cooling system

Abstract

The application relates to the technical field of cables, in particular to a cooling cable for high-power direct-current charging and a charging cooling system. The cooling cable comprises a cable core and a protective structure layer, the cable core is provided with at least two DC wire cores, a wire core cooling pipe group composed of two wire core cooling pipes and a pin cooling pipe group composed of two pin cooling pipes, a first DC wire core gap is arranged in a first wire core cooling pipe, a second DC wire core gap is arranged in a second wire core cooling pipe, the wire core cooling pipe group is used for passing cooling medium for heat exchange cooling of the DC wire core, and the pin cooling pipe group is used for passing cooling medium for heat exchange cooling of the charging pin. The simple and compact structure of the application can realize heat dissipation of the internal conductive wire core of the cable, effectively consider heat dissipation of the DC charging pin, maximize the cooling effect of the whole charging path, and reliably reduce the adverse effects caused by overheating of the charging path.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cables, in particular to a cooling cable for high-power direct current charging, and a charging cooling system comprising the same. BACKGROUND

[0002] The fast charging technology requirement of electric vehicles is realized in the form of high-power direct current charging. However, fast charging will generate a large amount of heat in the charging cable and associated equipment (including charging guns, etc.), so there are high technical requirements for the heat dissipation performance of the charging cable and associated equipment.

[0003] In order to achieve effective heat dissipation of the charging cable for fast charging of electric vehicles, the current common technical means is to lay a cooling pipe capable of passing cooling medium (such as insulating oil, compressed air, cooling water, etc.) inside the cable core, so that the heat of electric energy transmission is exchanged and dissipated through the cooling medium flowing in the cooling pipe, that is, the so-called "cooling cable".

[0004] At present, although the common cooling cable has various structural forms, its cooling object is only the conductive wire core in the cable core constituting the cable, that is, the conductive wire core for transmitting electric energy is exchanged and dissipated, and it cannot directly exchange and dissipate heat for the far-end charging gun connected to the cooling cable, especially the DC charging pin in the charging gun. It is known that the main heat source in the structure of the charging gun is the DC charging pin. Therefore, the heat exchange and dissipation of the current common cooling cable are aimed at the conductive wire core constituting the cable, and cannot effectively exchange and dissipate heat for the charging gun matched with the cooling cable, so that the dissipation effect of the conductive wire core is limited on the DC charging pin of the charging gun, and the charging gun as the fast charging path of the electric vehicle inhibits the charging efficiency and has the safety hidden danger of heat generation. SUMMARY

[0005] The technical purpose of the present application is to provide a cooling cable for high-power direct current charging which can realize heat dissipation of the conductive wire core inside the cable and heat dissipation of the DC charging pin in the charging gun, and a charging cooling system.

[0006] The technical purpose of the present application is achieved by the following technical scheme, a cooling cable for high-power direct current charging, comprising a cable core and a protective structure layer covering the outside of the cable core.

[0007] The cable core has at least two DC wire cores, a group of wire core cooling pipe groups and a group of pin cooling pipe groups, and the wire core cooling pipe group is composed of two wire core cooling pipes constituting a cooling loop, the pin cooling pipe group is composed of two pin cooling pipes constituting a cooling loop, and the pin cooling pipe group is independent of the wire core cooling pipe group.

[0008] The first DC wire core of the two DC wire cores is fitted into the first wire core cooling pipe of the wire core cooling pipe group in an annular space gap fitting structure, and the second DC wire core is fitted into the second wire core cooling pipe in an annular space gap fitting structure, and the wire core cooling pipe group is used as a cooling medium for heat exchange and cooling of the DC wire core;

[0009] The plug pin cooling pipe group is used as a cooling medium for heat exchange and cooling of the charging plug pin.

[0010] Further, the annular space gap fitting refers to that the DC wire core and the wire core cooling pipe maintain a coaxial state, and the annular space has a fitting gap of at least 1mm;

[0011] The cooling medium in the wire core cooling pipe performs heat exchange and cooling on the DC wire core in a submerged manner.

[0012] Further, the cooling medium is compressed air or insulating oil;

[0013] The DC wire core is a bare wire structure.

[0014] Alternatively, the cooling medium is cooling water;

[0015] The DC wire core has an insulating protective structure.

[0016] Further, the pipe diameters of the two plug pin cooling pipes of the plug pin cooling pipe group are respectively smaller than the pipe diameters of the wire core cooling pipes of the wire core cooling pipe group;

[0017] In the cable core structure, the two wire core cooling pipes of the wire core cooling pipe group are arranged in close proximity, and the two plug pin cooling pipes of the plug pin cooling pipe group are arranged at the two side fitting gaps of the wire core cooling pipe group.

[0018] A charging cooling system, comprising a charging pile end, a charging gun end, and a charging cable electrically connected between the charging pile end and the charging gun end and used for electric energy transmission;

[0019] The charging gun end is arranged with two DC charging plug pins;

[0020] The charging cable is any one of the above cooling cables for high-power direct current charging;

[0021] The cooling channel of the plug pin cooling pipe group of the cooling cable for high-power direct current charging is in communication with the DC charging plug pin.

[0022] Further, the plug pin first cooling pipe in the plug pin cooling pipe group is in communication with the two DC charging plug pin drainage ends of the charging gun end through a shunt side Y-shaped tee joint.

[0023] Further, the pin second cooling pipe in the pin cooling pipe group is communicated with the two DC charging pin drainage ends of the charging gun end through the confluence side Y-shaped three-way joint.

[0024] Further, the large-power DC charging cooling cable has a core cooling pipe group arranged at the charging gun end, and the core cooling pipe group has a core cooling pipe rotary joint arranged at the charging gun end, and the core cooling pipe rotary joint is communicated with a first core cooling pipe and a second core cooling pipe of the core cooling pipe group at the charging gun end.

[0025] Further, the charging pile end is arranged with a compressed air machine.

[0026] The first air outlet of the compressed air machine is connected with one end of the first core cooling pipe of the core cooling pipe group.

[0027] The second air outlet of the compressed air machine is connected with one end of the pin first cooling pipe of the pin cooling pipe group through the vortex cooling pipe.

[0028] The beneficial technical effects of the application are that the above technical measures are special for the special nature of the above-mentioned electric vehicle fast charging cooling cable and associated equipment, the core cooling pipe group and the pin cooling pipe group which can be circular and independently operated are integrated in the cable core of the cooling cable, the cooling medium in the core cooling pipe group is used for immersion heat exchange and heat dissipation of the DC core, the cooling medium in the pin cooling pipe group is used for heat exchange and heat dissipation of the DC charging pin in the remote charging gun, so that the cooling effect of the whole charging path of the electric vehicle is maximized, and the adverse effects (including charging efficiency and safety hazards) of the overheat of the charging path on the fast charging of the electric vehicle are reliably reduced. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is a structural schematic view of the cooling cable.

[0030] Figure 2 It is a structural schematic view of the charging cooling system.

[0031] Code meaning in the figure: 1 - first DC core; 2 - second DC core; 3 - first core cooling pipe; 4 - second core cooling pipe; 5 - core cooling pipe rotary joint; 6 - pin first cooling pipe; 7 - pin second cooling pipe; 8 - shunt side Y-shaped three-way joint; 9 - confluence side Y-shaped three-way joint; 10 - protective structure layer; 11 - compressed air machine; 12 - first air outlet; 13 - second air outlet; 14 - vortex cooling pipe; 15 - DC charging pin;

[0032] A - charging pile end; B - charging cable; C - charging gun end. DETAILED DESCRIPTION

[0033] The present application relates to the technical field of cable, in particular to a cooling cable for high-power DC charging, and a charging cooling system comprising the same. The main technical solution of the present application will be described in detail below in combination with multiple embodiments. Among them, embodiment 1 is combined with the drawings of the specification, i.e. Figure 1 and Figure 2 The technical solution of the present application is clearly and detailedly explained; although other embodiments are not separately drawn, the main structure can still refer to the drawings of embodiment 1.

[0034] It needs to be particularly pointed out that the drawings of the present application are schematic, and unnecessary details have been simplified in order to clarify the technical purpose of the present application, so as to avoid obscuring the technical solution of the present application contributed to the prior art. In addition, the expressions such as "about", "basically" and the like in the following with respect to quantity or cooperation relationship mean that the reasonable assembly error, processing error and the like are allowed, and are not the absolute quantity or cooperation relationship expressed literally.

[0035] Embodiment 1

[0036] Referring to Figure 1 , the present application is a cooling cable for high-power DC charging, which comprises a cable core and a protective structure layer 10 (including but not limited to a wrapping layer, a sheath layer, etc., see the protective structure layer of a conventional cooling cable) wrapped outside the cable core. The contribution of the present application to the prior art lies in the composition structure of the cable core.

[0037] Specifically, the cable core of the present application has at least two DC wire cores (i.e. first DC wire core 1 and second DC wire core 2), a group of wire core cooling pipe groups and a group of pin cooling pipe groups (as for other possible signal wire cores, see conventional cooling cable). Among them, the wire core cooling pipe group is composed of two wire core cooling pipes (i.e. first wire core cooling pipe 3 and second wire core cooling pipe 4) constituting a cooling loop, and the pin cooling pipe group is composed of two pin cooling pipes (i.e. pin first cooling pipe 6 and pin second cooling pipe 7) constituting a cooling loop, and the pin cooling pipe group cooperates with the wire core cooling pipe group to round the cross section of the cable core, but its cooling path runs basically independently of the wire core cooling pipe group.

[0038] The first wire core cooling pipe 3 and the second wire core cooling pipe 4 are respectively formed by extruding a temperature-resistant silicone rubber structure. In the cable core structure, the first wire core cooling pipe 3 and the second wire core cooling pipe 4 are arranged side by side.

[0039] The pin first cooling pipe 6 and the pin second cooling pipe 7 are respectively formed by extruding temperature-resistant silicone rubber structure, and the pipe diameters of the pin first cooling pipe 6 and the pin second cooling pipe 7 are respectively smaller than the pipe diameters of the core cooling pipe group (i.e. the first core cooling pipe 3 / the second core cooling pipe 4). In the cable core structure, the pin first cooling pipe 6 and the pin second cooling pipe 7 are arranged at the two sides of the core cooling pipe group in cooperation with the gap, and the cable core is rounded by the cooperation filling rope. The rounded cable core is tightened and shaped by the wrapping layer, so that the protection structure including the sheath layer is formed on the outside of the cable core.

[0040] The two DC cores are respectively twisted by copper wires, and are bare conductor structures without a wrapped insulation structure. Among them, the first DC core 1 is arranged in the first core cooling pipe 3 in a ring space gap cooperation structure, and the second DC core 2 is arranged in the second core cooling pipe 4 in a ring space gap cooperation structure; the ring space gap cooperation structure means that the DC core (the first DC core 1 / the second DC core 2) is coaxially arranged in the core cooling pipe (the first core cooling pipe 3 / the second core cooling pipe 4), and the annular gap is about 1mm, so as to create space conditions for the DC core immersed in the cooling medium in the core cooling pipe. Of course, the annular gap of the foregoing arrangement structure is not constant, and dynamically changes with the bending of the cable in use. Regardless of the change, the finally formed gap space is basically constant, so as to ensure the smooth flow of the cooling medium in the core cooling pipe, so that the cooling medium in the core cooling pipe basically exchanges heat with the DC core in an immersed manner. The first core cooling pipe 3 and the second core cooling pipe 4 of the core cooling pipe group are used to pass the cooling medium (preferably compressed air) for heat exchange and cooling of the DC core in the cooling channel.

[0041] The pin first cooling pipe 6 and the pin second cooling pipe 7 of the pin cooling pipe group are used to pass the cooling medium for heat exchange and cooling of the DC charging pin at the charging gun in the cooling channel, and the cooling medium is the same as the cooling medium passed by the core cooling pipe group, that is, preferably compressed air.

[0042] As described above, the cooling cable of the application is applied to the charging cooling system (or charging pile system) of the electric vehicle.

[0043] Referring to Figure 2 As shown, the charging cooling system of the application includes a charging pile end A, a charging gun end C, and a charging cable B electrically connected between the charging pile end A and the charging gun end C and used for power transmission.

[0044] Among them, the compressed air machine 11 as a cooling gas source is arranged at the charging pile end A, so as to deliver the cooling medium as compressed air to the charging cable B.

[0045] The charging gun end C is arranged with two DC charging pins 15 serving as positive and negative electrodes for charging the electric vehicle.

[0046] The charging cable B adopts the above-mentioned cooling cable structure for high-power DC charging. The first DC core 1 and the second DC core 2 are electrically connected to the DC charging pins 15 at the charging gun end C through the power supply at the charging pile end A. The first core cooling pipe 3 is sealingly connected to the outlet of the air compressor 11 at the charging pile end A. The pin first cooling pipe 6 is sealingly connected to the outlet of the air compressor 11 at the charging pile end A. The air compressor 11 has two independent branches, i.e., the first outlet 12 and the second outlet 13, to simultaneously sealingly connect the first core cooling pipe 3 and the pin first cooling pipe 6. The first outlet 12 is sealingly connected to the first core cooling pipe 3, and the second outlet 13 is sealingly connected to the pin first cooling pipe 6. To ensure that the cooling medium delivered over a long distance forms good heat exchange and cooling for the DC charging pins 15 at the charging gun end C, the vortex cooling pipe 14 is connected to the pipeline of the second outlet 13.

[0047] The first core cooling pipe 3 and the second core cooling pipe 4 of the above-mentioned core cooling pipe group are sealingly connected by the U-shaped core cooling pipe rotary joint 5 at the charging gun end C, so that the core cooling pipe rotary joint 5 sealingly connects the first core cooling pipe 3 and the second core cooling pipe 4 of the core cooling pipe group at the charging gun end C. The cooling medium entering through the first core cooling pipe 3 flows through the core cooling pipe rotary joint 5, enters the second core cooling pipe 4, and is discharged at the charging pile end A by the second core cooling pipe 4.

[0048] The pin first cooling pipe 6 of the above-mentioned pin cooling pipe group is sealingly connected to the two DC charging pins 15 at the charging gun end C through the shunt side Y-shaped tee joint 8 and is specifically connected to the flow channel inlet joint of the two DC charging pins 15. The connection structure adopts a hose sleeve pagoda joint locked by a hoop. The pin second cooling pipe 7 of the above-mentioned pin cooling pipe group is sealingly connected to the two DC charging pins 15 at the charging gun end C through the confluence side Y-shaped tee joint 9 and is specifically connected to the flow channel outlet joint of the two DC charging pins 15. The connection structure adopts a hose sleeve pagoda joint locked by a hoop. In this way, the cooling medium entering through the pin first cooling pipe 6 enters the two DC charging pins 15 under the shunt of the shunt side Y-shaped tee joint 8 to heat exchange and cool the two DC charging pins 15 at the same temperature. The cooling medium flowing through the two DC charging pins 15 enters the pin second cooling pipe 7 under the confluence of the confluence side Y-shaped tee joint 9, and is discharged at the charging pile end A by the pin second cooling pipe 7.

[0049] Embodiment 2

[0050] The other contents of this embodiment are the same as those of Embodiment 1, except that:

[0051] 1. The cooling medium in the wire core cooling pipe group and the pin cooling pipe group is respectively insulating oil;

[0052] 2. The compressed air machine at the end of the charging pile is replaced by an oil pump circulation system, and the two cooling pipes of the wire core cooling pipe group form a circulation loop at the end of the charging pile, and the two cooling pipes of the pin cooling pipe group form a circulation loop at the end of the charging pile.

[0053] Embodiment 3

[0054] The other contents of this embodiment are the same as those of Embodiment 1, except that:

[0055] 1. The cooling medium in the wire core cooling pipe group and the pin cooling pipe group is respectively cooling water;

[0056] 2. The compressed air machine at the end of the charging pile is replaced by a liquid pump circulation system, and the two cooling pipes of the wire core cooling pipe group form a circulation loop at the end of the charging pile, and the two cooling pipes of the pin cooling pipe group form a circulation loop at the end of the charging pile;

[0057] 3. The DC wire core has an insulating protective structure to insulate the DC wire core conductor from the cooling water in terms of electrical conductivity;

[0058] 4. The inner wall of the two DC charging pins is provided with an insulating coating structure to insulate the DC charging pins from the cooling water in terms of electrical conductivity.

[0059] The above embodiments are only used to illustrate the present application, but not to limit it.

[0060] Although the present application has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that the above embodiments can be modified, or some technical features can be replaced by equivalent ones; and these modifications or replacements do not make the corresponding technical solutions deviate from the spirit and scope of the present application.

Claims

1. A cooling cable for high-power DC charging, comprising a cable core and a protective structural layer (10) covering the outside of the cable core. Its features are: The cable core has at least two DC cores, a set of core cooling tube groups and a set of pin cooling tube groups, wherein the core cooling tube group is composed of two core cooling tubes forming a cooling circuit, and the pin cooling tube group is composed of two pin cooling tubes forming a cooling circuit, and the pin cooling tube group is independent of the core cooling tubes. Among them, the first DC core (1) of the two DC cores is installed in the first core cooling tube (3) of the core cooling tube group with an annular space gap fit structure, and the second DC core (2) is installed in the second core cooling tube (4) with an annular space gap fit structure. The core cooling tube group is used to introduce a cooling medium to exchange heat and cool the DC core. The cooling tube assembly of the pin is used as a cooling medium for heat exchange and cooling of the DC charging pin (15). The diameters of the two pin cooling tubes in the pin cooling tube assembly are smaller than the diameters of the core cooling tubes in the core cooling tube assembly. In the cable core structure, the two core cooling tubes of the core cooling tube group are arranged close to each other, and the two pin cooling tubes of the pin cooling tube group are respectively placed at the mating gap on both sides of the core cooling tube group.

2. The cooling cable for high-power DC charging according to claim 1, characterized in that: The aforementioned annular gap fit structure refers to the fact that, while the DC core and the core cooling tube are coaxial, the annular gap has a fit gap of at least 1 mm. The cooling medium inside the core cooling tube provides heat exchange and cooling to the DC core by immersion.

3. The cooling cable for high-power DC charging according to claim 1 or 2, characterized in that: The cooling medium is compressed air or insulating oil; The DC core is a bare conductor.

4. The cooling cable for high-power DC charging according to claim 1 or 2, characterized in that: The cooling medium is cooling water; The DC core has an insulating protective structure.

5. A charging cooling system, comprising a charging pile end A, a charging gun end C, and a charging cable B electrically connected between the charging pile end A and the charging gun end C for transmitting electrical energy; The charging gun end C has two DC charging pins (15). Its features are: The charging cable B is the high-power DC charging cooling cable as described in any one of claims 1 to 4; The cooling channel of the pin cooling tube assembly of the high-power DC charging cooling cable is connected to the DC charging pin (15).

6. The charging cooling system according to claim 5, characterized in that: The first cooling tube (6) of the pin cooling tube group is connected to the two DC charging pins (15) of the charging gun end C through the Y-type tee (8) on the shunt side.

7. The charging cooling system according to claim 5, characterized in that: The second cooling tube (7) of the pin cooling tube group is connected to the drain end of the two DC charging pins (15) of the charging gun end C through the Y-type tee (9) on the bus side.

8. The charging cooling system according to claim 5, characterized in that: The cooling tube assembly of the high-power DC charging cooling cable has a core cooling tube rotary joint (5) arranged at the charging gun end C. The core cooling tube rotary joint (5) connects the first core cooling tube (3) and the second core cooling tube (4) of the core cooling tube assembly at the charging gun end C.

9. The charging cooling system according to any one of claims 5 to 8, characterized in that: The charging pile end A is equipped with a compressed air machine (11). The first air outlet (12) of the compressed air machine (11) is connected to one end of the first core cooling tube (3) of the core cooling tube assembly; The second air outlet (13) of the compressed air machine (11) is connected to one end of the first cooling pipe (6) of the pin cooling pipe group through the vortex cooling pipe (14).

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