Liquid-cooled cables, charging guns, and charging equipment

Abstract

This application provides a liquid-cooled cable, a charging gun, and a charging device. The liquid-cooled cable includes N power cables and M liquid-cooling tubes, where N and M are even numbers greater than or equal to 4. The N power cables are arranged sequentially at intervals along the circumference of the liquid-cooled cable, and the M liquid-cooling tubes are arranged between the N power cables, with each power cable in contact with at least one liquid-cooling tube. This application reduces the bending stress of the liquid-cooled cable while ensuring that each power cable is in contact with a liquid-cooling tube. Therefore, the liquid-cooled cable is easy to bend for transportation and user use, while also ensuring effective heat dissipation, which is beneficial for meeting the heat dissipation requirements of the charging gun when delivering high power.

Description

Technical Field

[0001] This application relates to the field of charging, and more specifically, to a liquid-cooled cable, a charging gun, and a charging device. Background Technology

[0002] With the rapid popularization of electric vehicles and the increasing demands from users for faster charging speeds, the charging power delivered to electric vehicles via charging guns is constantly increasing. This increased charging power, however, leads to increased heat dissipation from the charging gun. To address this heat dissipation issue, the industry commonly uses liquid-cooled cables. However, in current applications, liquid-cooled cables are relatively long and have high overall rigidity, making them difficult to bend and thus inconvenient for transportation and user use. Utility Model Content

[0003] This application provides a liquid-cooled cable, a charging gun, and a charging device, which can reduce the bending stress of the liquid-cooled cable while ensuring that each power cable in the liquid-cooled cable is in contact with the liquid-cooling pipe. This allows the liquid-cooled cable to be easily bent for convenient transportation and user use, while also ensuring the heat dissipation effect of the liquid-cooled cable, which is beneficial for meeting the heat dissipation requirements of the charging gun when delivering high power.

[0004] In a first aspect, a liquid-cooled cable is provided, comprising N power cables and M liquid-cooling tubes, where N and M are even numbers greater than or equal to 4. The N power cables are arranged sequentially at intervals along the circumference of the liquid-cooled cable, and the M liquid-cooling tubes are arranged between the N power cables, with each power cable in contact with at least one liquid-cooling tube.

[0005] Based on the above design, compared to the typical liquid-cooled cable which only has two power cables as the positive and negative power cables respectively, this embodiment of the application, by setting the number of power cables in the liquid-cooled cable to be greater than or equal to four, not only improves the space utilization of the liquid-cooled cable but also reduces the radial cross-sectional area of ​​each power cable. This increases the overall rated current-carrying capacity of the liquid-cooled cable while reducing its overall stiffness, i.e., reducing the bending stress and making it easier to bend, thus facilitating transportation and user use.

[0006] Furthermore, by ensuring that each power cable is in contact with at least one liquid cooling pipe, it is guaranteed that the heat generated by each power cable can be transferred to the coolant flowing inside the liquid cooling pipe through the contacting pipe. This, in turn, ensures effective heat dissipation of the liquid-cooled cables, which helps meet the heat dissipation requirements of the charging gun when delivering high power and improves charging safety.

[0007] In conjunction with the first aspect, in some implementations of the first aspect, a liquid cooling pipe is provided between every two adjacent power cables in the N power cables, and the two power cables are in contact with one liquid cooling pipe.

[0008] Based on the above design, each power cable in the liquid-cooled cable can be adjacent to and in contact with two liquid-cooling pipes, thereby increasing the contact area between each power cable and the liquid-cooling pipes. This improves the efficiency of heat transfer from each power cable to the coolant in the liquid-cooling pipes, thus enhancing the heat dissipation effect of the liquid-cooled cable.

[0009] In conjunction with the first aspect, in some implementations of the first aspect, along the circumference of the liquid-cooled cable, the spacing between any two adjacent power cables in the N power cables is equal.

[0010] Based on the above design, the N power cables in the liquid-cooled cable can be symmetrically distributed along the circumference of the liquid-cooled cable, thereby further balancing the stress distribution of the liquid-cooled cable when bending, making the liquid-cooled cable easier to bend.

[0011] In conjunction with the first aspect, in some implementations of the first aspect, the liquid-cooled cable also includes an outer protective tube, which comprises a thermally conductive material. Specifically, N power cables and M liquid-cooled pipes are located inside the outer protective tube, and the surface of the outer protective tube facing the M liquid-cooled pipes is in contact with each liquid-cooled pipe.

[0012] Based on the above design, the outer protective tube can contain and protect N power cables and M liquid cooling pipes. Furthermore, the coolant flowing inside each liquid cooling pipe can absorb the heat generated by the power cables and then dissipate the heat carried by the coolant through the outer protective tube in contact with the liquid cooling pipe to the outside of the liquid cooling cable, thereby further improving the heat dissipation effect of the liquid cooling cable.

[0013] In conjunction with the first aspect, in some implementations of the first aspect, the liquid-cooled cable also includes multiple signal cables, each signal cable having a radial cross-sectional area smaller than a preset cross-sectional area. The multiple signal cables are divided into at least one group, and each group includes at least two signal cables, which are twisted together.

[0014] Based on the above design, multiple signal cables with smaller cross-sectional areas in the liquid-cooled cable can be twisted together in pairs, thereby improving the signal cable's resistance to torsional deformation and fracture, and preventing the signal cable from twisting and breaking due to its thinness when the liquid-cooled cable is bent.

[0015] In conjunction with the first aspect, in some implementations of the first aspect, the preset cross-sectional area is less than 2.5 mm². 2 .

[0016] Based on the above design, the cross-sectional area of ​​the liquid-cooled cable can be less than 2.5 mm².2 Multiple signal cables are twisted together in pairs to improve their resistance to torsion and breakage, thus preventing them from twisting and breaking when the liquid-cooled cable is bent due to its thinness.

[0017] In conjunction with the first aspect, in some implementations of the first aspect, the liquid-cooled cable further includes at least one electromagnetic shielding layer, each electromagnetic shielding layer comprising a conductive material. Specifically, each electromagnetic shielding layer corresponds one-to-one with at least one set of signal cables, and each electromagnetic shielding layer surrounds the corresponding set of signal cables circumferentially around the liquid-cooled cable.

[0018] Based on the above design, when multiple signal cables with small cross-sectional areas in a liquid-cooled cable are twisted together in pairs, an electromagnetic shielding layer can be wrapped around each strand of the twisted cable. This reduces the electromagnetic interference experienced by the signal cable and helps to meet the electromagnetic shielding requirements of the signal cable.

[0019] Secondly, a charging gun is provided, comprising a charging gun head and liquid-cooled cables as described in any one of the first aspects above. The charging gun head is used to connect to a charging socket of an electric vehicle. The charging gun head includes a positive power terminal and a negative power terminal. N power cables are divided into two groups, with one end of each group of power cables used to connect to a charging module. One end of one group of power cables is connected to the positive power terminal, and one end of the other group of power cables is connected to the negative power terminal.

[0020] In conjunction with the second aspect, in some implementations of the second aspect, the liquid-cooled cable includes multiple signal cables. One end of one signal cable is connected to a positive power terminal, one end of another signal cable is connected to a negative power terminal, and the other ends of one signal cable and the other signal cable are respectively used to connect to voltage detectors.

[0021] Based on the above design, the voltage detector can obtain the voltage between the positive power terminal and the negative power terminal in the charging gun head through two signal cables in the liquid-cooled cable. The voltage between the positive power terminal and the negative power terminal is the voltage output by the charging gun to the electric vehicle. This improves the accuracy of the voltage detector in detecting the output voltage of the charging gun.

[0022] Thirdly, a charging device is provided, which includes a charging module and a charging gun as described in any one of the second aspects above, wherein the charging module is used to deliver electrical energy to an electric vehicle through the charging gun.

[0023] In conjunction with the third aspect, in some implementations of the third aspect, the charging device also includes a voltage detector, and the liquid-cooled cable comprises multiple signal cables. Specifically, the voltage detector is connected to the positive power terminal in the charging head via one signal cable, and the voltage detector is connected to the negative power terminal in the charging head via another signal cable. The voltage detector is used to acquire the voltage between the positive and negative power terminals.

[0024] For details regarding the beneficial effects not covered in the second aspect, please refer to the beneficial effects covered in the first aspect above. For details regarding the beneficial effects not covered in the third aspect, please refer to the beneficial effects covered in the first and second aspects above. These details will not be repeated here. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of a charging device for charging an electric vehicle, as provided in an embodiment of this application.

[0026] Figures 2 to 4 These are schematic diagrams of the radial cross-section of a liquid-cooled cable provided in the embodiments of this application.

[0027] Figure 5 This is an example provided in the embodiments of this application. Figure 2 The diagram shows the specific structure of the liquid-cooled cable.

[0028] Figure 6 This is a schematic diagram of the structure of a charging gun provided in an embodiment of this application.

[0029] Figure 7 This is a schematic diagram of the structure of a charging device provided in an embodiment of this application. Detailed Implementation

[0030] To facilitate understanding of the embodiments of this application, the following points will be explained before introducing the embodiments of this application.

[0031] In the description of the embodiments of this application, "connection" can refer to an electrical connection. An electrical connection can be understood as the transmission of signals between two electrical components through a direct or indirect electrical connection. For example, an electrical connection between A and B can be understood as a direct electrical connection between A and B, or it can be understood as an indirect electrical connection between A and B through other electrical components.

[0032] In the description of the embodiments in this application, contact can be understood as direct or indirect contact between two structures. For example, contact between C and D can be understood as direct contact between C and D, or indirect contact between C and D through other structural components.

[0033] The terms "inner" and "outer" in the embodiments of this application indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0034] In the description of the embodiments of this application, "multiple" means two or more, and "at least one" and "one or more" mean one, two or more.

[0035] The technical solutions in this application will now be described with reference to the accompanying drawings.

[0036] First, to facilitate understanding of the technical solutions provided in the embodiments of this application, we will introduce the application scenarios applicable to the embodiments of this application.

[0037] Figure 1 This is a schematic diagram of a scenario where a charging device 10 charges an electric vehicle 20, as provided in an embodiment of this application.

[0038] Combination Figure 1 In (a) and (b), the charging device 10 is used to convert the AC power output from the power grid 30 into stable DC power and then output it to the electric vehicle 20 to charge the electric vehicle 20.

[0039] In one embodiment, such as Figure 1 As shown in (a), the charging device 10 is a split-type charging device. Specifically, the charging device 10 includes a charging host 11, multiple charging terminals 12, and multiple charging guns 13.

[0040] The charging host 11 includes multiple power converters (not shown in the figure), such as multiple alternating current-to-direct current (AC-DC) converters and multiple direct current-to-direct current (DC-DC) converters. The AC-DC converters convert the AC power output from the grid 30 into DC power and output it to the DC-DC converters. The DC-DC converters further convert the received DC power into DC power suitable for the electric vehicle 20 and output it to each charging terminal 12.

[0041] In addition, each charging terminal 12 is equipped with one or more charging guns 13. Each charging gun 13 is used to deliver the direct current output from the DC-DC converter in the charging host 11 to the electric vehicle 20 to charge the electric vehicle 20. In specific implementations, one or more charging guns 13 can be used simultaneously to charge the same electric vehicle 20.

[0042] It should be understood that, in the embodiments of this application, the charging terminal 12 may include a cabinet, a human-machine interface, a charging control unit, and a metering and billing unit, etc., for information interaction, power transmission, and metering and billing with the electric vehicle 20.

[0043] It should also be understood that, in the embodiments of this application, the electric vehicle 20 can be a means of transportation driven by electric power. The electric vehicle 20 can be, for example, a pure electric vehicle (pure EV / battery EV), a hybrid electric vehicle (HEV), a range-extended electric vehicle (REEV), or a plug-in hybrid electric vehicle (PHEV), etc.

[0044] In another embodiment, such as Figure 1 As shown in (b), the charging device 10 is an integrated charging device. Specifically, the human-machine interface, charging control unit, and metering and billing unit in the charging terminal 12 can be housed together with multiple power converters in the charging host 11, and the charging gun 13 can also be directly fixed to the charging host 11. Thus, the charging device 10 can include the charging host 11 and one or more charging guns 13 fixed to the charging host 11, but does not include the charging terminal 12.

[0045] For example, such as Figure 1 As shown in (b), the charging gun 13 may include a charging gun cable 131 and a charging gun head 132. One end of the charging gun cable 131 is connected to the DC-DC converter in the charging host 11, and the other end of the charging gun cable 131 is connected to the charging gun head 132, which is used to connect to the charging socket of the electric vehicle 20. In this way, the DC power output by the DC-DC converter can be delivered to the electric vehicle 20 through the charging gun cable 131 and the charging gun head 132.

[0046] As described in the background section above, in order to improve the charging speed of the electric vehicle 20, the charging power delivered by the charging device 10 to the electric vehicle 20 through the charging gun 13 is continuously increasing, aiming to achieve "one kilometer per second" fast charging for the electric vehicle 20. However, with the continuous increase in charging power, the heat generation of the cable used to transmit electrical energy in the charging gun cable 131 is becoming increasingly serious. To solve the heat dissipation problem of the cable, most current charging guns 13 use liquid-cooled cables as the charging gun cable 131. Specifically, the liquid-cooled cable generally includes a liquid-cooling pipe and a cable. The inner circumferential surface of the liquid-cooling pipe is used to form a liquid-cooling channel for the flow of coolant, and the outer circumferential surface of the liquid-cooling pipe is used to contact the cable. The liquid-cooling channel formed by the liquid-cooling pipe is also connected to an external cold source, thereby achieving heat dissipation of the cable through the circulation of coolant between the cold source and the liquid-cooling channel.

[0047] In current practical applications, due to the relatively long length of liquid-cooled cables, bending is usually necessary both during transportation and when the user uses the charging gun 13 to charge the electric vehicle 20. However, current liquid-cooled cables typically only have two cables, one for the positive terminal and one for the negative terminal, and each cable has a large radial cross-sectional area. This results in high overall rigidity of the liquid-cooled cable, making bending difficult.

[0048] Based on the above, this application provides a liquid-cooled cable, a charging gun, and a charging device. This reduces the bending stress of the liquid-cooled cable while ensuring that each power cable in the liquid-cooled cable is in contact with the liquid-cooling pipe. Furthermore, this allows the liquid-cooled cable to be easily bent for convenient transportation and user use, while also ensuring the heat dissipation effect of the liquid-cooled cable to meet the heat dissipation requirements of the charging gun when delivering high power.

[0049] The liquid-cooled cable provided in the embodiments of this application will now be described in conjunction with the accompanying drawings.

[0050] Figures 2 to 4 These are schematic diagrams of the radial cross-section of a liquid-cooled cable 40 provided in the embodiments of this application.

[0051] Combination Figures 2 to 4 The liquid-cooled cable 40 includes N power cables 41, where N is an even number greater than or equal to 4. Each power cable 41 is used to transmit electrical energy, and each power cable 41 is formed, for example, by twisting together multiple copper wires. The N power cables 41 are arranged sequentially at intervals along the circumference of the liquid-cooled cable 40. For example, as... Figure 2 As shown, taking N=4 as an example, four power cables 41 are arranged alternately along the circumference of the liquid cooling cable 40.

[0052] Based on the above design, in practical applications, the N power cables 41 in the liquid-cooled cable 40 can be divided into two groups of equal number. One group of power cables 41 serves as the positive power cable in the liquid-cooled cable 40, and the other group serves as the negative power cable. That is, the number of positive power cables and the number of negative power cables in the liquid-cooled cable 40 are both greater than or equal to 2. For example, as... Figures 2 to 4 As shown, taking the liquid-cooled cable 40, which includes four power cables 41, as an example, two power cables 41 serve as positive power cables, and the other two power cables 41 serve as negative power cables.

[0053] It should be understood that, compared to the typical liquid-cooled cable 40 which typically only has two power cables serving as the positive and negative power cables respectively, this embodiment of the application, by setting the number N of power cables 41 in the liquid-cooled cable 40 to be greater than or equal to 4, not only improves the space utilization of the liquid-cooled cable 40 but also reduces the radial cross-sectional area of ​​each power cable 41. This not only increases the overall rated current-carrying capacity of the liquid-cooled cable 40 but also reduces its overall stiffness, thereby lowering the bending stress. Furthermore, it increases the bendable angle of the liquid-cooled cable 40, making it easier to bend and thus facilitating transportation and user use.

[0054] In one embodiment, combined with Figures 2 to 4 Each power cable 41 has a radial cross-sectional area greater than or equal to 4 mm². 2 And less than or equal to 35mm 2 This allows the radial cross-sectional area of ​​each power cable 41 in the liquid-cooled cable 40 to be within a small range, thereby effectively reducing the bending stress of the liquid-cooled cable 40.

[0055] In one embodiment, combined with Figures 2 to 4 The liquid-cooled cable 40 also includes N insulation layers 42, which correspond one-to-one with the N power cables 41. Each insulation layer 42 covers the outer periphery of the corresponding power cable 41 along its circumference. In other words, the outer periphery of each power cable 41 in the liquid-cooled cable 40 is covered by an insulation layer 42, thereby providing insulation protection for the power cable 41 through the insulation layer 42.

[0056] In one embodiment, combined with Figures 2 to 4The liquid-cooled cable 40 also includes M liquid-cooled tubes 43, where M is an even number greater than or equal to 4, and M can be greater than or equal to N. The M liquid-cooled tubes 43 are arranged among the N power cables 41, and each power cable 41 is in contact with at least one liquid-cooled tube 43. Specifically, the inner circumferential surface of each liquid-cooled tube 43 forms a liquid-cooling channel for coolant flow, and each power cable 41 is in contact with the outer circumferential surface of at least one liquid-cooled tube 43. For example, each power cable 41 can indirectly contact the outer circumferential surface of at least one liquid-cooled tube 43 through its own outer insulating layer 42.

[0057] Based on the above design, the heat generated by each power cable 41 during operation can be transferred to the coolant flowing inside the liquid cooling pipe 43 through the liquid cooling pipe 43 in contact with it, thereby ensuring the heat dissipation effect of the liquid cooling cable 40, which is beneficial to meeting the heat dissipation requirements of the charging gun when delivering high power and improving charging safety.

[0058] In one embodiment, see Figure 2 In the liquid-cooled cable 40, a liquid-cooling pipe 43 is provided between every two adjacent power cables 41, and each pair of adjacent power cables 41 is in contact with a liquid-cooling pipe 43 located between the two power cables 41. For example, as Figure 2 As shown, taking an example where M and N are equal (i.e., the number of power cables 41 and the number of liquid cooling pipes 43 in the liquid-cooled cable 40 are equal), N power cables 41 and M liquid cooling pipes 43 are arranged along the circumference of the liquid-cooled cable 40 in the order of one power cable 41, one liquid cooling pipe 43, one power cable 41, one liquid cooling pipe 43, and so on. In other words, each power cable 41 is adjacent to two liquid cooling pipes 43, and each power cable 41 is in contact with two adjacent liquid cooling pipes 43. This increases the contact area between each power cable 41 and the liquid cooling pipe 43 in the liquid-cooled cable 40, improving the efficiency of heat transfer from each power cable 41 to the coolant in the liquid cooling pipe 43, thereby improving the heat dissipation effect of the liquid-cooled cable 40.

[0059] In another embodiment, see Figure 3Taking the example where the number of power cables 41 and the number of liquid cooling pipes 43 in the liquid-cooled cable 40 are equal, a liquid cooling pipe 43 is provided between every two adjacent power cables 41 in the liquid-cooled cable 40, that is, each power cable 41 is adjacent to two liquid cooling pipes 43. Among the N power cables 41, some power cables 41 are in contact with two adjacent liquid cooling pipes 43, while others are in contact with the outer circumferential surface of one adjacent liquid cooling pipe 43. This increases the contact area between the power cables 41 and the liquid cooling pipes 43, improving the efficiency of heat transfer from the power cables 41 to the coolant in the liquid cooling pipes 43, thereby improving the heat dissipation effect of the liquid-cooled cable 40.

[0060] In another embodiment, see [reference] Figure 4 Taking M greater than N as an example, i.e., when the number of liquid cooling pipes 43 in the liquid-cooled cable 40 is greater than the number of power cables 41, in addition to one liquid cooling pipe 43 between every two adjacent power cables 41, the remaining liquid cooling pipes 43 are arranged in other positions between the N power cables 41, so that each power cable 41 can contact at least two liquid cooling pipes 43. In this way, the contact area between each power cable 41 and the liquid cooling pipe 43 in the liquid-cooled cable 40 can be significantly increased, improving the efficiency of heat transfer from each power cable 41 to the coolant in the liquid cooling pipe 43, thereby improving the heat dissipation effect of the liquid-cooled cable 40.

[0061] It should be understood that, Figures 2 to 4 In the liquid-cooled cable 40 shown, since each pair of adjacent power cables 41 is separated by a liquid-cooling pipe 43, the insulation layer 42 covering the outer periphery of the power cables 41 can be prevented from softening due to heat generation, thus avoiding the problem of the insulation layers 42 of adjacent power cables 41 sticking together and causing insulation failure. This, in turn, improves the service life and reliability of the liquid-cooled cable 40.

[0062] It should also be understood that Figures 2 to 4 In the embodiment shown, the M liquid cooling pipes 43 in the liquid-cooled cable 40 can be divided into two groups of equal number. In one group, the liquid cooling channel formed inside each liquid cooling pipe 43 serves as the liquid inlet channel and is used to receive the coolant output from the external cold source. In the other group, the liquid cooling channel formed inside each liquid cooling pipe 43 serves as the liquid outlet channel and is used to output the coolant to the external cold source.

[0063] For example, such as Figure 2 and Figure 3As shown, taking a liquid-cooled cable 40 comprising four liquid-cooled tubes 43 as an example, the liquid-cooled channels M1 and M2 formed inside two of the liquid-cooled tubes 43 serve as liquid inlet channels, while the liquid-cooled channels M3 and M4 formed inside the other two liquid-cooled tubes 43 serve as liquid outlet channels. Alternatively, as... Figure 4 As shown, taking the liquid-cooled cable 40, which includes 6 liquid-cooled tubes 43 as an example, the liquid-cooled channels M1, M2 and M3 formed inside the three liquid-cooled tubes 43 are all liquid inlet channels, and the liquid-cooled channels M4, M5 and M6 formed inside the other three liquid-cooled tubes 43 are all liquid outlet channels.

[0064] In one embodiment, continue to combine Figures 2 to 4 Along the circumference of the liquid-cooled cable 40, the spacing between any two adjacent power cables 41 in the N power cables 41 is equal. That is, the N power cables 41 are symmetrically distributed along the circumference of the liquid-cooled cable 40, thereby further balancing the stress distribution of the liquid-cooled cable 40 when bent, making the liquid-cooled cable 40 easier to bend.

[0065] In one embodiment, combined with Figures 2 to 4 The liquid-cooled cable 40 also includes an outer protective tube 44, within which N power cables 41 and M liquid-cooled pipes 43 are located. This allows the outer protective tube 44 to contain and protect the N power cables 41 and M liquid-cooled pipes 43.

[0066] Furthermore, in one example, combining Figure 2 and Figure 3 The outer protective tube 44 includes a thermally conductive material, and the surface of the outer protective tube 44 facing the M liquid cooling tubes 43 is in contact with each liquid cooling tube 43. That is, the inner circumferential surface of the outer protective tube 44 is in thermally conductive contact with the outer circumferential surface of each liquid cooling tube 43. In this way, the coolant flowing inside each liquid cooling tube 43 can absorb the heat generated by the power cable 41 and then dissipate the heat it carries through the outer protective tube 44 in contact with the liquid cooling tube 43 to the outside of the liquid cooling cable 40, thereby further improving the heat dissipation effect of the liquid cooling cable 40.

[0067] The power cable 41 housed within the outer protective conduit 44 has been described above. The following section will focus on... Figure 2 Taking the liquid-cooled cable 40 shown as an example, we will introduce other cables installed inside the external protection tube 44.

[0068] Figure 5 This is an example provided in the embodiments of this application. Figure 2 The schematic diagram of the specific structure of the liquid-cooled cable 40 shown.

[0069] In one embodiment, see Figure 5The liquid-cooled cable 40 also includes multiple signal cables 45, which are located inside the outer protective tube 44. These signal cables 45 may include, for example, signal cables for connecting to the communication terminal in the charging head, signal cables for connecting to the connection confirmation (CC) terminal in the charging head, and signal cables for connecting to the temperature sensor in the charging head.

[0070] In this configuration, the cross-sectional area of ​​each signal cable 45 along its radial direction is smaller than a preset cross-sectional area. Multiple signal cables 45 can be grouped into at least one group, and each group includes at least two signal cables 45 twisted together; that is, the at least two signal cables 45 are twisted into a single strand. For example, as... Figure 5 As shown, taking the liquid-cooled cable 40, which includes ten signal cables 45, as an example, the ten signal cables 45 are divided into two groups, one group is denoted as group S1, and the other group is denoted as group S2. Group S1 includes three signal cables 45, which are twisted together into one cable. Group S2 includes seven signal cables 45, which are twisted together into one cable.

[0071] Based on the above design, at least two of the signal cables 45 with smaller cross-sectional areas in the liquid-cooled cable 40 can be twisted together into one strand, thereby improving the signal cable 45's resistance to torsional deformation and fracture, and preventing the signal cable 45 from torsionally breaking when the liquid-cooled cable 40 is bent due to its thinness.

[0072] In one embodiment, the preset cross-sectional area is less than 2.5 mm². 2 The preset cross-sectional area can be, for example, equal to 0.75 mm². 2 .

[0073] Based on the above design, the cross-sectional area of ​​the liquid-cooled cable 40 can be less than 2.5 mm². 2 The multiple signal cables 45 are twisted together in pairs to improve the resistance of the signal cables 45 to torsion deformation and fracture, and to prevent the signal cables 45 from torsion and breaking due to their thinness when the liquid-cooled cable 40 is bent.

[0074] In one embodiment, the number of signal cables 45 in the liquid-cooled cable 40 can be any integer from 8 to 16. For example, the number of signal cables 45 in the liquid-cooled cable 40 can be 14 or 16.

[0075] In one embodiment, see further. Figure 5The liquid-cooled cable 40 also includes at least one electromagnetic shielding layer 46, each electromagnetic shielding layer 46 comprising a conductive material. Each electromagnetic shielding layer 46 corresponds one-to-one with at least one group of signal cables 45, which are composed of a plurality of signal cables 45, and each electromagnetic shielding layer 46 surrounds the corresponding group of signal cables 45 circumferentially around the liquid-cooled cable 40.

[0076] For example, such as Figure 5 As shown, taking multiple signal cables 45 as groups S1 and S2 respectively as an example, the liquid-cooled cable 40 also includes two electromagnetic shielding layers 46. One electromagnetic shielding layer 46 surrounds the three signal cables 45 in group S1 along the circumference of the liquid-cooled cable 40, and the other electromagnetic shielding layer 46 surrounds the seven signal cables 45 in group S2 along the circumference of the liquid-cooled cable 40.

[0077] Based on the above design, when at least two of the multiple signal cables 45 with small cross-sectional areas in the liquid-cooled cable 40 are twisted into one strand, an electromagnetic shielding layer 46 can be wrapped around the outside of each strand of the twisted cable. This reduces the electromagnetic interference experienced by the signal cable 45 and helps to meet the electromagnetic shielding requirements of the signal cable 45.

[0078] In one embodiment, each electromagnetic shielding layer 46 may include an aluminum-plastic composite tape layer and a metal braided shielding layer. The aluminum-plastic composite tape layer surrounds a corresponding set of signal cables 45 along the circumference of the liquid-cooled cable 40, and the metal braided shielding layer covers the outer circumferential surface of the aluminum-plastic composite tape layer along the circumference of the liquid-cooled cable 40. The metal braided shielding layer may be, for example, a copper braided shielding layer. Thus, the combined effect of the aluminum-plastic composite tape layer and the metal braided shielding layer can reduce electromagnetic interference experienced by the signal cables 45.

[0079] In one embodiment, see Figure 5 The liquid-cooled cable 40 also includes multiple auxiliary power cables 47 and a grounding cable 48, all housed within the outer protective tube 44. The auxiliary power cables 47 are used to connect to the auxiliary power supply in the charging device, and the grounding cable 48 is used for grounding protection. For example, the cross-sectional area of ​​each auxiliary power cable 47 along its radial direction is less than 2.5 mm². 2 The cross-sectional area of ​​the grounding cable 48 along its radial direction is greater than or equal to 6 mm². 2 and less than or equal to 16mm 2 .

[0080] In one embodiment, see Figure 5The liquid-cooled cable 40 also includes an auxiliary connection layer 49, which comprises an aluminum-plastic composite tape layer, a metal braided shielding layer, and a non-woven fabric layer. Specifically, the non-woven fabric layer covers the inner circumferential surface of the outer protective tube 44 along the circumferential direction of the liquid-cooled cable 40; the metal braided shielding layer covers the inner circumferential surface of the non-woven fabric layer along the circumferential direction of the liquid-cooled cable 40; and the aluminum-plastic composite tape layer covers the inner circumferential surface of the metal braided shielding layer along the circumferential direction of the liquid-cooled cable 40. N power cables 41 and M liquid-cooled tubes 43 are all located within the aluminum-plastic composite tape layer.

[0081] In addition, the inner circumferential surface of the aluminum-plastic composite strip layer is in thermal contact with the outer circumferential surface of each liquid cooling pipe 43, so that each liquid cooling pipe 43 can be in thermal contact with the inner circumferential surface of the outer protective pipe 44 through the aluminum-plastic composite strip layer, the metal braided shielding layer and the non-woven fabric layer.

[0082] It should be understood that, in practice, the signal cable 45, the auxiliary power cable 47, the grounding cable 48, and the N power cables 41 are all located within the aluminum-plastic composite tape layer.

[0083] Based on the above design, the shielding combination consisting of the aluminum-plastic composite tape layer, the metal braided shielding layer, and the non-woven fabric layer can shield the power cable 41, signal cable 45, etc. located in the aluminum-plastic composite tape, thereby reducing electromagnetic interference and helping to meet the electromagnetic shielding requirements of the liquid-cooled cable 40.

[0084] The liquid-cooled cable 40 provided in the embodiments of this application has been described above. The following describes a charging gun and charging device including the liquid-cooled cable 40.

[0085] Figure 6 This is a schematic diagram of the structure of a charging gun 50 provided in an embodiment of this application.

[0086] In one embodiment, see Figure 6 The charging gun 50 includes a charging head 51 and the liquid-cooled cable 40 described above. The charging head 51 is used to connect to the charging socket of an electric vehicle. The charging head 51 includes a positive power terminal 511 and a power terminal 512. The N power cables 41 in the liquid-cooled cable 40 are divided into two groups. One end of each group of power cables 41 is used to connect to the charging module. The other end of one group of power cables 41 is connected to the positive power terminal 511, and the other end of the other group of power cables 41 is connected to the negative power terminal 512. That is, the two groups of power cables 41 serve as the positive and negative power cables, respectively.

[0087] For example, combining Figures 2 to 6Taking the liquid-cooled cable 40, which includes four power cables 41, as an example, the four power cables 41 are divided into two equal groups. One group of power cables 41 serves as the positive power cable and is used to connect between the positive output terminal and the positive power terminal 511 of the charging module. The other group of power cables 41 serves as the negative power cable and is used to connect between the negative output terminal and the negative power terminal 512 of the charging module. In this way, the electrical energy output by the charging module can be transmitted through the power cables 41 in the liquid-cooled cable 40 to the positive power terminal 511 and the negative power terminal 512 in the charging gun head 51, and then transmitted to the electric vehicle through the positive power terminal 511 and the negative power terminal 512 to charge the electric vehicle.

[0088] It should be understood that, in the embodiments of this application, the charging module can be understood as a DC-DC converter in a charging device. For a detailed description, please refer to... Figure 1 The relevant descriptions of the embodiments shown will not be repeated here.

[0089] In one embodiment, combined with Figure 5 and Figure 6 In the liquid-cooled cable 40, one end of one signal cable 45 is connected to the positive power terminal 511, and one end of another signal cable 45 is connected to the negative power terminal 512. The other ends of the two signal cables 45 are respectively used to connect to voltage detectors. The voltage detector may be, for example, a voltmeter.

[0090] Based on the above design, the two signal cables 45 connecting the positive power terminal 511 and the negative power terminal 512 can be used as high-voltage cables. The voltage detector can obtain the voltage between the positive power terminal 511 and the negative power terminal 512 in the charging gun head 51 through these two signal cables 45. The voltage between the positive power terminal 511 and the negative power terminal 512 is the voltage output by the charging gun 50 to the electric vehicle. This improves the accuracy of the voltage detector in detecting the output voltage of the charging gun 51.

[0091] Figure 7 This is a schematic diagram of the structure of a charging device 60 provided in an embodiment of this application.

[0092] In one embodiment, see Figure 7 The charging device 60 includes a charging module 61 and the charging gun 50 described above. The charging module 61 is used to supply electrical energy to the electric vehicle through the charging gun 50. For a detailed description of the connection method between the charging module 61 and the charging gun 50, please refer to [reference needed]. Figure 6 The relevant descriptions of the embodiments shown will not be repeated here.

[0093] In some embodiments, combined with Figures 5 to 7The charging device 60 also includes a voltage detector 62, which is connected to the positive power terminal 511 via a signal cable 45 in the liquid-cooled cable 40, and is also connected to the negative power terminal 512 via another signal cable 45 in the liquid-cooled cable 40.

[0094] Furthermore, the voltage detector 62 is used to obtain the voltage between the positive power terminal 511 and the negative power terminal 512 via the two signal cables 45. In other words, the voltage detector 62 is used to obtain the voltage output from the charging gun 50 to the electric vehicle via the two signal cables 45, thereby improving the accuracy of the voltage detector 62 in detecting the output voltage of the charging gun 51. For a detailed description, please refer to... Figure 6 The relevant descriptions of the embodiments shown will not be repeated here.

[0095] It should be understood that, in the embodiments of this application, the charging device 60 can be a separate charging device or an integrated charging device. For a detailed description, please refer to... Figure 1 The relevant descriptions of the embodiments shown will not be repeated here.

[0096] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A liquid-cooled cable, characterized by, The liquid-cooled cable includes N power cables and M liquid-cooled tubes, where N and M are even numbers greater than or equal to 4. The N power cables are arranged sequentially at intervals along the circumference of the liquid-cooled cable, and the M liquid-cooled tubes are arranged between the N power cables, with each power cable in contact with at least one liquid-cooled tube.

2. The liquid-cooled cable of claim 1, wherein, A liquid cooling pipe is provided between every two adjacent power cables in the N power cables, and the two power cables are respectively in contact with the outer wall of the liquid cooling pipe.

3. The liquid-cooled cable of claim 1 or 2, wherein, The liquid-cooled cable also includes an outer protective tube, which comprises a thermally conductive material; wherein... The N power cables and the M liquid cooling pipes are located inside the outer protective tube, and the surface of the outer protective tube facing the M liquid cooling pipes is in contact with each of the liquid cooling pipes.

4. The liquid-cooled cable of claim 1 or 2, wherein, The liquid-cooled cable also includes multiple signal cables, each of which has a radial cross-sectional area smaller than a preset cross-sectional area; wherein, The plurality of signal cables are divided into at least one group, and each group of signal cables includes at least two signal cables, which are twisted together.

5. The liquid-cooled cable of claim 4, wherein, The preset cross-sectional area is less than 2.5 mm 2 .

6. The liquid-cooled cable of claim 4, wherein, The liquid-cooled cable further includes at least one electromagnetic shielding layer, each of which comprises a conductive material; wherein... The at least one electromagnetic shielding layer corresponds one-to-one with the at least one set of signal cables, and each electromagnetic shielding layer surrounds the corresponding set of signal cables along the circumference of the liquid-cooled cable.

7. A charging gun, characterized in that The charging gun includes a charging head and a liquid-cooled cable as described in any one of claims 1 to 6, wherein the charging head is used to connect to the charging socket of an electric vehicle; wherein, The charging gun head includes a positive power terminal and a negative power terminal. The N power cables are divided into two groups. One end of each group of power cables is used to connect to the charging module. One end of one group of power cables is connected to the positive power terminal, and one end of the other group of power cables is connected to the negative power terminal.

8. The charging gun of claim 7, wherein, The liquid-cooled cable includes multiple signal cables, wherein, One end of one of the signal cables is connected to the positive power terminal, and one end of the other signal cable is connected to the negative power terminal. The other ends of the one signal cable and the other signal cable are respectively used to connect to a voltage detector.

9. A charging device, characterized by The charging device includes a charging module and a charging gun as described in claim 7 or 8, wherein the charging module is used to deliver electrical energy to an electric vehicle through the charging gun.

10. The charging device according to claim 9, characterized in that, The charging device also includes a voltage detector, and the liquid-cooled cable includes multiple signal cables, wherein... The voltage detector is connected to the positive power terminal in the charging gun head via one of the signal cables, and the voltage detector is connected to the negative power terminal in the charging gun head via the other signal cable; The voltage detector is used to obtain the voltage between the positive power terminal and the negative power terminal.

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