Heat dissipation device and heat dissipation method for megawatt charging cable

Abstract

The invention relates to the technical field of charging cables, in particular to a heat dissipation device and a heat dissipation method for a megawatt charging cable. The device comprises a heat dissipation device which is provided with an annular rib structure on the surface of a charging cable; a temperature sensor is arranged on the surface of the charging cable; the cooling circulation device comprises a control system and a liquid cooling pipeline; wherein the liquid cooling pipeline is arranged in a gap of the heat dissipation structure in a snakelike manner and is attached to the surface of the charging cable; the control system collects the current surface temperature of the charging cable according to the temperature sensor, and adjusts the temperature of the cooling liquid in the liquid cooling pipeline according to the current surface temperature. The heat dissipation capacity of the charging cable is improved by increasing the heat dissipation area of the charging cable through the annular rib structure; the heat exchange amount of the charging cable is improved through a new liquid cooling pipe layout mode; temperature monitoring and dynamic adjustment of the cooling circulation device are combined to reduce heat dissipation loss and improve heat dissipation efficiency.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of charging cables, in particular to a heat dissipation device and a heat dissipation method for a megawatt charging cable. BACKGROUND

[0002] At present, the charging power of traditional passenger cars cannot meet the needs of medium and heavy vehicles (such as electric trucks, engineering machinery) and ships, aircraft and other high-energy consumption carriers, and a higher-power charging solution is urgently needed. Megawatt charging (MWC) technology is a cutting-edge research direction in recent years to meet the rapid charging needs of electric carriers (especially medium and heavy vehicles, ships, aircraft, etc.). Megawatt charging can solve the range anxiety and accelerate the popularization of electric heavy trucks, electric ships, etc. Megawatt charging (such as 1.5 MW) can charge an electric truck for 80% in 15-30 minutes, close to the refueling efficiency of a diesel vehicle, reduce the downtime of the vehicle fleet, and improve the commercial viability. Megawatt charging stations can be equipped with photovoltaic / energy storage systems to achieve direct supply of green electricity and reduce dependence on fossil fuels.

[0003] High current based on megawatt charging easily leads to overheating of the charging cable and the interface, and the material and cooling technology needs to be improved. Therefore, a heat dissipation device and a heat dissipation method for a megawatt charging cable are needed to efficiently and quickly reduce the temperature of the charging cable and improve the safety and reliability of the product. SUMMARY

[0004] The purpose of the application is to provide a heat dissipation device and a heat dissipation method for a megawatt charging cable, which increases the heat dissipation area of the charging cable through a ring rib structure to improve its heat dissipation capacity, improves the heat exchange capacity of the charging cable through a new liquid cooling pipe layout method, and reduces heat dissipation loss and improves heat dissipation efficiency through the combination of temperature monitoring and dynamic adjustment of the cooling circulation device.

[0005] In order to achieve the above-mentioned purpose, the following technical solutions are adopted in the application: In a first aspect, the application provides a heat dissipation device for a megawatt charging cable, comprising: A heat dissipation device with a ring rib structure is arranged on the surface of the charging cable; A temperature sensor is arranged on the surface of the charging cable; A cooling circulation device, comprising a control system and a liquid cooling pipe, wherein the liquid cooling pipe is arranged in a meandering shape in the gap of the heat dissipation structure and is attached to the surface of the charging cable; The control system collects the current surface temperature of the charging cable according to the temperature sensor, and adjusts the temperature of the cooling liquid in the liquid cooling pipe according to the current surface temperature.

[0006] Optionally, the heat dissipation device is a fin type.

[0007] Optionally, the temperature sensor is arranged at the middle and both ends of the charging cable.

[0008] Optionally, the height of the heat dissipation device is 1-3 cm higher than the liquid cooling pipeline.

[0009] Optionally, the distance between two adjacent heat dissipation devices is the diameter of the liquid cooling pipeline.

[0010] In the second aspect, the application provides a heat dissipation method for a megawatt charging cable, which is suitable for the heat dissipation device provided in the first aspect, and the method comprises: collecting the current surface temperature of the charging cable; calculating the heat generation of the charging cable according to the current surface temperature and the parameters of the charging cable; predicting the surface temperature of the charging cable at the next time due to energization according to the heat generation; predicting the heat dissipation amount of the heat dissipation device at the next time according to the surface temperature at the next time; making the sum of the heat dissipation amount of the heat dissipation device at the next time and the heat dissipation amount of the liquid cooling pipeline greater than or equal to the heat generation, and calculating the minimum heat dissipation amount of the liquid cooling pipeline at the next time; calculating the maximum temperature of the cooling liquid at the next time according to the minimum heat dissipation amount of the liquid cooling pipeline at the next time; adjusting the temperature of the cooling liquid according to the maximum temperature.

[0011] Optionally, calculating the heat generation of the charging cable according to the current surface temperature and the parameters of the charging cable comprises: calculating the heat generation of the charging cable by the following formula : ; wherein P is the charging power, U is the charging voltage, I is the charging current, R is the resistance of the charging cable, p is the resistivity of the charging cable, A is the cross-sectional area of the charging cable, L is the length of the charging cable, a is the correction coefficient, and T 线 is the current surface temperature of the charging cable.

[0012] Optionally, predicting the surface temperature of the charging cable at the next time due to energization according to the heat generation comprises: calculating the surface temperature of the charging cable at the next time due to energization by the following formula: ; wherein, is the surface temperature of the charging cable at the next time; is the heat generation of the charging cable at the current moment; h is the heat dissipation coefficient; and As is the surface area of the charging cable.

[0013] Optionally, the sum of the heat dissipation of the heat dissipation device and the heat dissipation of the liquid cooling pipeline at the next moment is greater than or equal to the heat generation, the minimum heat dissipation of the liquid cooling pipeline at the next moment is calculated, and the method comprises the following steps. The minimum heat dissipation of the liquid cooling pipeline at the next moment is calculated by the following formula: ; Wherein, is the minimum heat dissipation of the liquid cooling pipeline at the next moment, is the heat dissipation of the heat dissipation device at the next moment, is the heat generation of the charging cable at the current moment.

[0014] Optionally, according to the minimum heat dissipation of the liquid cooling pipeline at the next moment, the highest temperature of the cooling liquid at the next moment is calculated, and the method comprises the following steps. The highest temperature of the cooling liquid at the next moment is calculated by the following formula: ; Wherein, is the highest temperature of the cooling liquid at the next moment, is the surface temperature of the charging cable at the next moment, is the minimum heat dissipation of the liquid cooling pipeline at the next moment, is the heat exchange coefficient of the cooling liquid, is the heat exchange coefficient of the cooling pipeline, is the wall thickness of the cooling pipeline, is the surface area of the cooling pipeline.

[0015] Compared with the prior art, the beneficial effects of the present application are: 1. High heat dissipation: the heat dissipation of the charging cable is increased by the ring rib structure, and the heat exchange of the charging cable is increased by a new liquid cooling pipeline layout method.

[0016] 2. Dynamic adjustment: the heat dissipation loss is reduced and the heat dissipation efficiency is improved by combining temperature monitoring with dynamic adjustment of the cooling circulation device. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the specific embodiments or prior art of the present application, the following will briefly introduce the drawings needed to be used in the specific embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0018] Figure 1is a cross-sectional view of a heat dissipation device for a megawatt charging cable provided by an embodiment of the present application; Figure 2 is a perspective view of a heat dissipation device for a megawatt charging cable provided by an embodiment of the present application; Figure 3 is a flow chart of a heat dissipation method for a megawatt charging cable provided by an embodiment of the present application; Figure 4 is a structural schematic diagram of a control system provided by an embodiment of the present application. DETAILED DESCRIPTION

[0019] The exemplary embodiments of the present application are described below in conjunction with the accompanying drawings, which include various details of the embodiments of the present application to assist in understanding, and should be considered as merely exemplary. Thus, those of ordinary skill in the art should recognize that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present application. Also, for the sake of brevity and clarity, descriptions of well-known functions and constructions are omitted from the following description.

[0020] The present application is further described in detail below in conjunction with the embodiments.

[0021] Figure 1 is a cross-sectional view of a heat dissipation device for a megawatt charging cable provided by an embodiment of the present application; Figure 2 is a perspective view of a heat dissipation device for a megawatt charging cable provided by an embodiment of the present application. The following describes the heat dissipation device for a megawatt charging cable in conjunction with Figure 1 and Figure 2 the structure and functions of the heat dissipation device for a megawatt charging cable are described in detail.

[0022] The heat dissipation device with a ring-rib structure is arranged on the surface of the charging cable. The ring-rib structure can increase the surface area, which helps heat dissipation. The heat dissipation device is a fin type, and the ring-rib is arranged continuously in a wave shape (serpentine shape), which greatly increases the heat dissipation surface area in contact with air.

[0023] A temperature sensor is arranged on the surface of the charging cable. The present embodiment does not limit the arrangement position of the temperature sensor. Optionally, in order to effectively monitor the temperature of the entire charging cable, the temperature sensor is arranged at the middle and both ends of the charging cable, which can monitor the temperature at the middle and both ends of the charging cable in real time.

[0024] The cooling circulation device comprises a control system and a liquid cooling pipe; wherein the liquid cooling pipe is arranged in a meandering manner in the gap of the heat dissipation structure and is attached to the surface of the charging cable. That is, the liquid cooling pipe and the ring-rib structure are meanderingly and staggeringly wound on the surface of the charging cable. Optionally, the height of the heat dissipation device is 1-3 cm higher than that of the liquid cooling pipe, and the distance between two adjacent heat dissipation devices is the diameter of the liquid cooling pipe, so that the liquid cooling pipe and the heat dissipation device can completely cover the surface of the charging cable.

[0025] The inlet and outlet of the liquid cooling pipe are respectively led out from the cooling liquid inlet and outlet of the cooling circulation device, that is, the cooling liquid flows into the cooling pipe from the cooling liquid inlet of the cooling circulation device and flows out of the cooling pipe from the cooling liquid outlet of the cooling circulation device.

[0026] It should be noted that the cooling circulation device further comprises a pump and a heat exchanger. The pump is equivalent to the "heart" of the cooling circulation device, which provides power for the cooling liquid and overcomes the resistance of the liquid cooling pipe, so that the cooling liquid continuously circulates in the whole closed loop system. The heat exchanger comprises a condenser, which is responsible for discharging the heat absorbed by the cooling liquid to the external environment (usually air or cooling water), so as to cool down the cooling liquid. According to different heat dissipation modes, the condenser can be divided into a fan-cooled condenser (cooled by a fan) and a water-cooled condenser (cooled by external cooling tower water).

[0027] The control system collects the current surface temperature of the charging cable according to the temperature sensor, adjusts the temperature of the cooling liquid in the liquid cooling pipe according to the current surface temperature, and ensures that the cooling liquid flowing into the liquid cooling pipe can meet the heat dissipation demand of the charging cable.

[0028] Compared with the prior art, the application has the following beneficial effects: 1. High heat dissipation capacity: the heat dissipation capacity of the charging cable is improved by increasing the heat dissipation area through the ring-rib structure; and the heat exchange capacity of the charging cable is improved by a new liquid cooling pipe layout mode.

[0029] 2. Dynamic adjustment: the heat dissipation loss is reduced and the heat dissipation efficiency is improved by combining temperature monitoring with dynamic adjustment of the cooling circulation device Figure 3 is a flow chart of a heat dissipation method for a megawatt-level charging cable provided by the embodiment of the application. The method can be executed by a computer program and integrated in the control system of the cooling circulation device. In this embodiment, the temperature of the cooling liquid is adjusted by the heat dissipation method for the megawatt-level charging cable integrated in the control system to meet the heat dissipation demand of the charging cable. As shown in Figure 3 The heat dissipation method for the megawatt-level charging cable provided by the embodiment is applicable to the heat dissipation device for the megawatt-level charging cable provided by the foregoing embodiment, and comprises the following steps: S110, collecting the current surface temperature of the charging cable.

[0030] The current surface temperature of the charging cable is monitored in real time by the temperature sensor arranged on the charging cable. When multiple temperature sensors are arranged at different positions, the real-time temperatures at different positions can be monitored simultaneously.

[0031] S120, according to the current surface temperature and the parameters of the charging cable, the heat generation of the charging cable is calculated.

[0032] The heat generation of the charging cable is calculated by the following formula : ; Wherein, P is the charging power, the unit is W; U is the charging voltage, the unit is V; I is the charging current, the unit is ampere; R is the resistance of the charging cable, the unit is Ω; ρ is the resistivity of the charging cable, the unit is Ω·m, assuming that the copper cable is used in this embodiment, the resistivity of copper is 1.68×10 -8 Ω·m; A is the cross-sectional area of the charging cable, the unit is mm 2 ; L is the length of the charging cable, the unit is m; α is the correction coefficient, the α of copper is about 0.00393 / ℃; T 线 is the current surface temperature of the charging cable.

[0033] The heat generation calculated here is caused by the energization of the charging cable, without heat exchange with the environment and without heat dissipation. The heat generation calculated based on the current surface temperature of the charging cable will affect the surface temperature of the charging cable at the next moment.

[0034] S130, according to the heat generation, the surface temperature of the charging cable at the next moment (for example, the moment after 2s) caused by energization is predicted.

[0035] The surface temperature of the charging cable at the next moment caused by energization is calculated by the following formula: ; Wherein, is the surface temperature of the charging cable at the next moment; is the heat generation of the charging cable at the current moment; h is the heat dissipation coefficient, the unit is W / m 2 K, the natural convection is about 5-25W / m 2 ·K; As is the surface area of the charging cable, the unit is m 2 .

[0036] The purpose of this embodiment is to predict the surface temperature of the charging cable at the next moment at the current moment, to consume the heat generation generated at the current moment by adjusting the temperature of the cooling liquid at the next moment, to make the surface temperature of the charging cable at the next moment fall back, and to maintain the stability of the surface temperature of the charging cable.

[0037] S140, predicting the heat dissipation amount of the heat dissipation device according to the surface temperature of the next time.

[0038] The heat dissipation amount of the heat dissipation device of the next time is predicted by using the following formula: ; Wherein, is the heat dissipation amount of the heat dissipation device of the next time, and the unit is W; is the surface area of the heat dissipation device, and the unit is m 2 ; is the surface temperature of the charging cable of the next time, and the unit is K; is the ambient temperature, and the unit is K; is the height of the heat dissipation device, and the unit is m; is the heat exchange coefficient of the heat dissipation device, and the unit is W / m·K.

[0039] S150, the sum of the heat dissipation amount of the heat dissipation device of the next time and the heat dissipation amount of the liquid cooling pipeline is greater than or equal to the heat generation amount, and the minimum heat dissipation amount of the liquid cooling pipeline of the next time is calculated.

[0040] There is the following formula: ; Wherein, is the total heat dissipation amount of the next time, is the heat dissipation amount of the heat dissipation device of the next time, is the heat dissipation amount of the liquid cooling pipeline of the next time. is the surface area of the cooling pipeline, and the unit is m 2 ; is the heat exchange coefficient of the cooling liquid, and the unit is W / m 2 ·K; is the wall thickness of the cooling pipeline, and the unit is m; is the heat exchange coefficient of the cooling pipeline, and the unit is W / m·K. is the temperature of the cooling liquid of the next time.

[0041] The minimum heat dissipation amount of the liquid cooling pipeline of the next time is calculated by using the following formula: ; Wherein, is the minimum heat dissipation amount of the liquid cooling pipeline of the next time, is the heat dissipation amount of the heat dissipation device of the next time, is the heat generation amount of the charging cable of the current time.

[0042] S160, calculating the highest temperature of the cooling liquid of the next time according to the minimum heat dissipation amount of the liquid cooling pipeline of the next time; The highest temperature of the cooling liquid of the next time is calculated by using the following formula: ; wherein, is the highest temperature of the cooling liquid at the next time, is the surface temperature of the charging cable at the next time, is the minimum heat dissipation of the liquid cooling pipeline at the next time, is the heat exchange coefficient of the cooling liquid, is the heat exchange coefficient of the cooling pipeline, is the wall thickness of the cooling pipeline, is the surface area of the cooling pipeline.

[0043] S170, temperature adjustment is performed on the cooling liquid according to the highest temperature.

[0044] The highest temperature is the temperature that the cooling liquid must reach, and the cooling liquid can also be adjusted to a temperature lower than the highest temperature.

[0045] The embodiment provides that in the scenario of cooperative heat dissipation of the heat dissipation device and the cooling pipeline, the highest temperature of the cooling liquid at the next time is determined in advance, so that the surface temperature of the charging cable is adjusted in time, and safety is higher.

[0046] As Figure 4 shown, the embodiment provides a control system, including: at least one processor; and a memory in communication with the at least one processor; wherein, the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the method described above. The at least one processor in the control system can perform the method described above, and thus has at least the same advantages as the method described above.

[0047] Optionally, the control system further includes an interface for connecting various components, including a high-speed interface and a low-speed interface. Various components are connected to each other by different buses, and can be installed on a common motherboard or in other ways as needed. The processor can process instructions executed within the control system, including graphical information stored in the memory or on the memory to display a GUI (Graphical User Interface) on an external input / output device, such as a display device coupled to the interface. In other embodiments, multiple processors can be used with multiple memories, and / or multiple buses can be used with multiple memories, if necessary. Similarly, multiple electronic devices (for example, as a server array, a group of blade servers, or a multi-processor system) can be connected, each device providing part of the necessary operations. Figure 4 In the embodiment, a processor 301 is taken as an example.

[0048] The memory 302, as a computer readable storage medium, can be used to store software programs, computer executable programs and modules, such as program instructions / modules corresponding to the heat dissipation method for megawatt charging cable in the embodiments of the present application. The processor 301 performs various function applications and data processing of the device by running the software programs, instructions and modules stored in the memory 302, that is, implements the heat dissipation method for megawatt charging cable as described above.

[0049] The memory 302 can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system and application programs required by at least one function; the data storage area can store data created according to the use of the terminal, etc. In addition, the memory 302 can include a high-speed random access memory, and can also include a non-volatile memory, such as at least one magnetic disk storage device, a flash memory device, or other non-volatile solid-state memory device. In some examples, the memory 302 can further include a memory remotely arranged with respect to the processor 301, which can be connected to the device through a network. Examples of the above network include but are not limited to the Internet, an intranet, a local area network, a mobile communication network, and a combination thereof.

[0050] The control system can also include an input device 303 and an output device 304. The processor 301, the memory 302, the input device 303 and the output device 304 can be connected by a bus or other means, Figure 4 For example, by bus connection.

[0051] The input device 303 can receive input digital or character information, and the output device 304 can include a display device, an auxiliary lighting device (for example, an LED), a tactile feedback device (for example, a vibration motor), etc. The display device can include but is not limited to a liquid crystal display (LCD), a light emitting diode (LED) display and a plasma display. In some embodiments, the display device can be a touch screen.

[0052] In the above embodiments, all or part of the embodiments can be implemented by software, hardware, firmware or any combination thereof. When implemented by software, all or part of the embodiments can be implemented in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of the present application are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network or other programmable apparatus. The computer instructions can be stored in a computer-readable storage medium or transferred from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions can be transmitted from one website, computer, server or data center to another website, computer, server or data center through a wired manner, for example, coaxial cable, optical fiber, digital subscriber line (DSL) or a wireless manner, for example, infrared, wireless, microwave, etc. The computer-readable storage medium can be any available medium accessible by a computer, or a data storage device such as a server, data center, etc. integrated with one or more available media. The available medium can be a magnetic medium (for example, a floppy disk, a hard disk, a magnetic tape), an optical medium or a semiconductor medium, etc. It should be noted that the computer-readable storage medium mentioned in the embodiments of the present application can be a non-volatile storage medium, in other words, it can be a non-transitory storage medium.

[0053] It should be understood that the above-mentioned various forms of processes can be reordered, added or deleted. For example, the steps described in the present application can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solutions disclosed in the present application can be achieved, which are not limited herein.

[0054] The above detailed description does not constitute a limitation on the scope of protection of the present application. Those skilled in the art should understand that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A heat dissipation device for a megawatt-class charging cable, characterized in that: include: A heat dissipation device with a ring rib structure is provided on the surface of the charging cable; A temperature sensor is arranged on the surface of the charging cable; A cooling circulation device, comprising a control system and a liquid cooling pipeline; wherein the liquid cooling pipeline is arranged in a serpentine shape in the gap of the heat dissipation structure and is attached to the surface of the charging cable; The control system collects the current surface temperature of the charging cable according to the temperature sensor, and adjusts the temperature of the coolant in the liquid cooling pipeline according to the current surface temperature.

2. The heat dissipation device for a megawatt-class charging cable according to claim 1, characterized in that: The heat dissipation device is of fin type.

3. The heat dissipation device for a megawatt-class charging cable according to claim 2, characterized in that: The temperature sensors are arranged in the middle and at both ends of the charging cable.

4. The heat dissipation device for a megawatt-class charging cable according to claim 1, characterized in that: The height of the heat sink is 1-3 cm higher than the liquid cooling pipeline.

5. The heat dissipation device for a megawatt-class charging cable according to claim 1, characterized in that: The distance between two adjacent heat sinks is the diameter of the liquid cooling pipe.

6. A heat dissipation method for a megawatt-class charging cable, characterized in that: Applicable to the heat dissipation device according to any one of claims 1 to 5, the method comprising: Collect the current surface temperature of the charging cable; Calculating a heat value of the charging cable based on the current surface temperature and parameters of the charging cable; predicting, based on the heat generation, a surface temperature of the charging cable at a next moment caused by power being supplied; predicting the heat dissipation of the heat dissipation device at the next moment according to the surface temperature at the next moment; Assuming that the sum of the heat dissipation of the heat dissipation device and the heat dissipation of the liquid cooling pipeline at the next moment is greater than or equal to the heat output, and calculating the minimum heat dissipation of the liquid cooling pipeline at the next moment; Calculating the maximum temperature of the coolant at the next moment based on the minimum heat dissipation of the liquid cooling pipeline at the next moment; The temperature of the coolant is adjusted according to the maximum temperature.

7. The heat dissipation method for a megawatt-class charging cable according to claim 6, characterized in that: Calculating the heat generated by the charging cable according to the current surface temperature and parameters of the charging cable includes: Use the following formula to calculate the heat generated by the charging cable : ； Where, P is the charging power; U is the charging voltage; I is the charging current; R is the resistance of the charging cable; ρ is the resistivity of the charging cable; A is the cross-sectional area of ​​the charging cable; L is the length of the charging cable; α is the correction factor; T 线 The current surface temperature of the charging cable.

8. The heat dissipation method for a megawatt-class charging cable according to claim 7, characterized in that: Predicting, based on the heat generation, a surface temperature of the charging cable at a next moment caused by power being supplied, including: The surface temperature of the charging cable at the next moment caused by power-on is calculated using the following formula: ； in, is the surface temperature of the charging cable at the next moment; is the heat generated by the charging cable at the current moment; h is the heat dissipation coefficient; As is the surface area of ​​the charging cable.

9. The heat dissipation method for a megawatt-class charging cable according to claim 8, characterized in that: The sum of the heat dissipation of the heat dissipation device and the heat dissipation of the liquid cooling pipeline at the next moment is set to be greater than or equal to the heat output, and the minimum heat dissipation of the liquid cooling pipeline at the next moment is calculated, including: Use the following formula to calculate the minimum heat dissipation of the liquid cooling pipeline at the next moment: ； in, is the minimum heat dissipation of the liquid cooling pipeline at the next moment, is the heat dissipation of the heat sink at the next moment, It is the heat generated by the charging cable at the current moment.

10. The heat dissipation method for a megawatt-class charging cable according to claim 9, characterized in that: Calculating the maximum temperature of the coolant at the next moment based on the minimum heat dissipation of the liquid cooling pipeline at the next moment includes: Use the following formula to calculate the maximum temperature of the coolant at the next moment: ； in, is the maximum temperature of the coolant at the next moment, is the surface temperature of the charging cable at the next moment, is the minimum heat dissipation of the liquid cooling pipeline at the next moment, is the coolant heat transfer coefficient, is the heat transfer coefficient of the cooling pipe, is the cooling pipe wall thickness, is the surface area of ​​the cooling pipe.

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