A new energy charging pile liquid cooling detection system

Abstract

The present invention relates to the technical field of abnormality detection in new energy vehicle charging piles, and specifically to a liquid cooling detection system for new energy charging piles. The system quantifies the inherent influence of current and power on temperature difference through a reference temperature difference, thereby eliminating interference from operating condition fluctuations. The system eliminates false rising signals caused by ambient temperature changes through environmental compensation temperature rise, i.e., the corrected temperature rise rate. The current-power coupling factor ensures that abnormalities are only triggered when current and power match, thereby reducing the false alarm rate. Secondly, when the temperature difference is less than the temperature difference threshold, the temperature rise rate weight is automatically increased, thereby increasing the sensitivity of the detection system to the temperature rise of the liquid cooling cable, accelerating the detection system to lock the leakage point, and performing a joint analysis based on three factors: a dynamic reference of temperature difference, an environmental compensation temperature rise, and a current-power coupling factor. This greatly improves the accuracy of identifying leakage of the liquid cooling cable in the supercharging pile, and dynamically adjusts the judgment threshold according to the real-time power to reduce the false alarm rate.

Description

Technical Field

[0001] The present invention relates to the technical field of abnormality detection of new energy vehicle charging piles, and in particular to a liquid cooling detection system for new energy vehicle charging piles. Background Art

[0002] As new energy vehicle supercharging technology evolves toward power levels exceeding 480kW, liquid cooling systems have become a key solution for overcoming thermal management bottlenecks. Existing supercharging stations generally utilize a design that shares a cooling circuit between the power module and the liquid cooling cable, dynamically distributing cooling capacity through a heat dissipation manifold. However, the liquid cooling cable presents a risk of leakage due to frequent plugging and unplugging, mechanical stress, and material aging. Therefore, a multi-parameter, interference-resistant, real-time leakage detection system for new energy charging stations is urgently needed. Summary of the Invention

[0003] The purpose of the present invention is to provide a new energy charging pile liquid cooling detection system to improve the current new energy super charging pile lack of detection means for liquid cooling cable leakage.

[0004] In order to achieve the above objectives, the embodiments of the present application provide the following technical solutions:

[0005] The embodiment of the present application provides a new energy charging pile liquid cooling detection system, which is applicable to the new energy vehicle super charging pile liquid cooling system. The liquid cooling system includes a heat dissipation manifold, a power module cold plate and a liquid cooling cable. The system includes: a temperature difference abnormal detection module for real-time calculation of the power module temperature. and liquid-cooled cable temperature Temperature difference , and based on the current value of the liquid cooling cable in real time and power module power Dynamically generate reference temperature difference , then based on the reference temperature difference and temperature difference Generate temperature difference constant index ; Temperature rise monitoring module, used to cyclically monitor the temperature rise rate of the liquid cooling cable within 30-40 seconds , and based on the current ambient temperature Corrected temperature rise rate , and then get the corrected temperature rise rate ; Working condition coupling factor calculation module, used for current value of liquid cooling cable based on real-time and power module power Calculate the coupling factor ; Liquid cooling cable leakage judgment module, used to receive the temperature difference normal index feedback from the temperature difference normal detection module , the corrected temperature rise rate fed back by the temperature rise monitoring module The coupling factor fed back by the working condition coupling factor calculation module , and through the comprehensive evaluation function Generate judgment results and The liquid cooling cable leakage alarm is triggered when is the preset liquid cooling cable leakage warning threshold, where 、 and is the weight value, is the Sigmoid function.

[0006] Optionally, based on the current value of the liquid cooling cable in real time and power module power Dynamically generate reference temperature difference ,include:

[0007] Reference temperature difference , where the reference temperature difference Used to quantify the inherent effects of current and power on temperature differences, is the temperature difference increment caused by each 1A increase in current, This is the increase in temperature difference caused by a 1kW increase in power.

[0008] Optionally, based on a reference temperature difference and temperature difference Generates temperature difference constant index, including:

[0009] Temperature Difference Index , where the temperature difference constant index For normalizing temperature offsets, It is the standard deviation of historical data statistics, used to measure the normal fluctuation range.

[0010] Optionally, based on the current ambient temperature Corrected temperature rise rate , and then get the corrected temperature rise rate ,include:

[0011] Temperature rise rate ,in, is the natural heat dissipation coefficient, Used to characterize the temperature difference between liquid-cooled cables and the environment.

[0012] Optionally, based on the current value of the liquid cooling cable in real time and power module power Calculate the coupling factor ,include:

[0013] Coupling factor ,in, is the coupling factor, is the rated current, is the rated power, is a natural constant, is the coupling strength coefficient.

[0014] Optionally, collect real-time temperature differences , and then construct the temperature difference The corresponding historical mean and standard deviation , while combining real-time power module power Build real-time dynamic temperature difference threshold ,in is the power correction factor, is the maximum power value corresponding to the power module, Used to reduce the probability of false triggering of charging piles under high power conditions;

[0015] When the temperature difference Temperature difference threshold When (leakage may occur), it will cause the temperature difference to be constant. is a negative value, then , at this time, the comprehensive scoring function is forced to be triggered The weight compensation in The weight value of , thereby guiding the system to increase its sensitivity to the temperature rise of the liquid cooling cable.

[0016] Optionally, based on the current value of the liquid cooling cable in real time Temperature rise rate after dynamic configuration correction Corresponding temperature rise rate threshold ,in is the basic threshold, is the current correction coefficient, and the temperature rise rate after correction is Temperature rise rate threshold At this time There will be exponential growth, and the Sigmoid function will be activated at the same time .

[0017] The beneficial effects of the present invention are:

[0018] The new energy charging pile liquid cooling detection system described in the present invention combines three factors: a dynamic temperature difference benchmark, environmental compensation temperature rise, and current-power coupling factor for joint analysis. This greatly improves the accuracy of leak identification of liquid cooling cables in supercharging piles. At the same time, it dynamically adjusts the judgment threshold according to real-time power to reduce the false alarm rate.

[0019] Specifically, the reference temperature difference , quantify the inherent effects of current and power on temperature differences, and eliminate interference from operating condition fluctuations;

[0020] The temperature rise is corrected by the environment compensation temperature rise , stripping off the false rising signal caused by ambient temperature changes;

[0021] Through the current-power coupling factor Ensures that anomalies are triggered only when current and power match, thereby reducing the false alarm rate (the measured false alarm rate has been reduced from 5% to 0.1%).

[0022] By setting the temperature difference threshold Dynamic adjustment, automatically relax the threshold value in high power working condition to avoid normal fluctuation false alarm, by associating the temperature rise rate threshold current, that is, the temperature rise rate threshold , improves the detection system's threshold for judging whether the system will rise under high current conditions, and prevents misjudgment of overcurrent and temperature rise;

[0023] Secondly, the degree difference Temperature difference threshold When the temperature rise rate is increased, the weight of the temperature rise rate is automatically increased, thereby increasing the sensitivity of the detection system to the temperature rise of the liquid-cooled cable and accelerating the detection system to locate the leakage point.

[0024] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or understood by practicing the embodiments of the present invention. The purposes and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description, claims, and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 It is the new energy charging pile liquid cooling detection system described in the embodiment of the present invention;

[0027] Figure 2 It is the new energy vehicle supercharging pile liquid cooling system described in the embodiment of the present invention. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0029] It should be noted that similar reference numerals or letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings. At the same time, in the description of the present invention, the terms "first", "second", etc. are only used to distinguish the description and should not be understood as indicating or implying relative importance.

[0030] Example: This embodiment provides a new energy charging pile liquid cooling detection system, suitable for Figure 2 The new energy vehicle super charging pile liquid cooling system shown in the figure includes a heat dissipation manifold, a power module cold plate and a liquid cooling cable. Figure 1 As shown, the new energy charging pile liquid cooling detection system includes:

[0031] Temperature difference detection module, used to calculate the power module temperature in real time and liquid-cooled cable temperature Temperature difference , temperature difference Used to characterize the heat dissipation balance state of the liquid cooling system; at the same time, based on the real-time current value of the liquid cooling cable and power module power Dynamically generate reference temperature difference , where the reference temperature difference Used to quantify the inherent effects of current and power on temperature differences, is the temperature difference increment caused by each 1A increase in current, The temperature difference increment caused by each 1kW increase in power; then based on the reference temperature difference and temperature difference Generate temperature difference constant index , where the temperature difference constant index For normalizing temperature offsets, The standard deviation of historical data is used to measure the normal fluctuation range;

[0032] Temperature rise monitoring module, used to cyclically monitor the temperature rise rate of the liquid cooling cable within 30-40 seconds , and based on the current ambient temperature Corrected temperature rise rate , and then get the corrected temperature rise rate ,in, is the natural heat dissipation coefficient, Used to characterize the temperature difference between liquid-cooled cables and the environment;

[0033] Condition coupling factor calculation module for current values ​​of liquid cooling cables based on real-time and power module power Calculate the coupling factor ,in, is the coupling factor, is the rated current, is the rated power, is a natural constant, is the coupling strength coefficient;

[0034] Liquid cooling cable leakage judgment module, used to receive the temperature difference normal index fed back by the temperature difference normal detection module , the corrected temperature rise rate fed back by the temperature rise monitoring module The coupling factor fed back by the working condition coupling factor calculation module , and through the comprehensive evaluation function Generate a judgment result, where When the leakage alarm is triggered, is the preset liquid cooling cable leakage warning threshold, is the temperature difference constant, Temperature rise term, is the working condition verification item, Used to characterize only Negative abnormality, for example, when there is leakage at the connection between the liquid cooling cable and the gun head liquid line.

[0035] Secondly, in this embodiment, the real-time temperature difference is collected , and then construct the temperature difference The corresponding historical mean and standard deviation , while combining real-time power module power Build real-time dynamic temperature difference threshold ,in is the power correction factor, is the maximum power value corresponding to the power module, Used to reduce the probability of false triggering of charging piles under high power conditions;

[0036] When the temperature difference Temperature difference threshold When the temperature difference is high, leakage may occur, which will cause the temperature difference to be high. is a negative value, then , at this time, the comprehensive scoring function is forced to be triggered The weight compensation in The weight value of , thereby guiding the system to increase its sensitivity to the temperature rise of the liquid cooling cable.

[0037] Secondly, in this embodiment, based on the current value of the real-time liquid cooling cable Temperature rise rate after dynamic configuration correction Corresponding temperature rise rate threshold ,in is the basic threshold, is the current correction coefficient, and the temperature rise rate after correction is Temperature rise rate threshold At this time There will be exponential growth, and the Sigmoid function will be activated at the same time .

[0038] In this embodiment, the reference temperature difference , quantify the inherent effects of current and power on temperature differences, and eliminate interference from operating condition fluctuations;

[0039] The temperature rise is corrected by the environment compensation temperature rise , stripping off the false rising signal caused by ambient temperature changes;

[0040] Through the current-power coupling factor Ensures that anomalies are triggered only when current and power match, thereby reducing the false alarm rate (the measured false alarm rate has been reduced from 5% to 0.1%).

[0041] By setting the temperature difference threshold Dynamic adjustment, automatically relax the threshold value in high power working condition to avoid normal fluctuation false alarm, by associating the temperature rise rate threshold current, that is, the temperature rise rate threshold , improves the detection system's threshold for judging whether the system will rise under high current conditions, and prevents misjudgment of overcurrent and temperature rise;

[0042] Secondly, the degree difference Temperature difference threshold When the temperature rise rate is increased, the weight of the temperature rise rate is automatically increased, thereby increasing the sensitivity of the detection system to the temperature rise of the liquid-cooled cable and accelerating the detection system to locate the leakage point.

[0043] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A new energy charging pile liquid cooling detection system, suitable for the new energy vehicle super charging pile liquid cooling system, the liquid cooling system includes a heat dissipation manifold, a power module cold plate and a liquid cooling cable, characterized in that: The system comprises: Temperature difference detection module, used to calculate the power module temperature in real time and liquid-cooled cable temperature Temperature difference , and based on the current value of the liquid cooling cable in real time and power module power Dynamically generate reference temperature difference , then based on the reference temperature difference and temperature difference Generate temperature difference constant index ; Temperature rise monitoring module, used to cyclically monitor the temperature rise rate of the liquid cooling cable within 30-40 seconds , and based on the current ambient temperature Corrected temperature rise rate , and then get the corrected temperature rise rate ; Condition coupling factor calculation module for current values ​​of liquid cooling cables based on real-time and power module power Calculate the coupling factor ; Liquid cooling cable leakage judgment module, used to receive the temperature difference normal index fed back by the temperature difference normal detection module , the corrected temperature rise rate fed back by the temperature rise monitoring module The coupling factor fed back by the working condition coupling factor calculation module , and through the comprehensive evaluation function Generate judgment results and The liquid cooling cable leakage alarm is triggered when is the preset liquid cooling cable leakage warning threshold, where 、 and is the weight value, is the Sigmoid function; Among them, based on the reference temperature difference and temperature difference Generates temperature difference constant index, including: Temperature Difference Index , where the temperature difference constant index For normalizing temperature offsets, The standard deviation of historical data is used to measure the normal fluctuation range; Among them, based on the current ambient temperature Corrected temperature rise rate , and then get the corrected temperature rise rate ,include: Temperature rise rate ,in, is the natural heat dissipation coefficient, Used to characterize the temperature difference between liquid-cooled cables and the environment; Among them, based on the current value of the real-time liquid cooling cable and power module power Calculate the coupling factor ,include: Coupling factor ,in, is the coupling factor, is the rated current, is the rated power, is a natural constant, is the coupling strength coefficient.

2. The new energy charging pile liquid cooling detection system according to claim 1, characterized in that: Based on real-time current values ​​of liquid-cooled cables and power module power Dynamically generate reference temperature difference ,include: Reference temperature difference , where the reference temperature difference Used to quantify the inherent effects of current and power on temperature differences, is the temperature difference increment caused by each 1A increase in current, This is the increase in temperature difference caused by a 1kW increase in power.

3. The new energy charging pile liquid cooling detection system according to claim 1, characterized in that: Collect real-time temperature differences , and then construct the temperature difference The corresponding historical mean and standard deviation , while combining real-time power module power Build real-time dynamic temperature difference threshold ,in is the power correction factor, is the maximum power value corresponding to the power module, Used to reduce the probability of false triggering of charging piles under high power conditions; When the temperature difference <Temperature difference threshold When the temperature difference is constant, it will cause is a negative value, then =0, the comprehensive scoring function is forced to be triggered at this time The weight compensation in The weight value of , thereby guiding the system to increase its sensitivity to the temperature rise of the liquid cooling cable.

4. The new energy charging pile liquid cooling detection system according to claim 3, characterized in that: Based on real-time current values ​​of liquid-cooled cables Temperature rise rate after dynamic configuration correction Corresponding temperature rise rate threshold ,in is the basic threshold, is the current correction coefficient, and the temperature rise rate after correction is >Temperature rise rate threshold At this time There will be exponential growth, and the Sigmoid function will be activated at the same time ≈1.

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