Method, device and equipment for identifying aging charging pile of new energy vehicle and medium

Abstract

The present application relates to a kind of new energy vehicle identification aging charging pile method, device, equipment and medium, wherein, method includes: the feature temperature rise value extracted based on historical charging record establishes the dynamic baseline temperature rise value of vehicle;When charging, it is judged whether direct current charging current is in the preset charging current region and has maintained first preset time;If direct current charging current is in the preset charging current region and has maintained first preset time, current temperature value at charging socket is collected, and the actual temperature rise value at charging socket is calculated;The actual temperature rise value at the charging socket is compared with the dynamic baseline temperature rise value, and aging attribution determination is carried out according to the comparison result.The present application can conveniently, objectively, accurately identify and early warning charging pile aging problem.

Description

Technical Field

[0001] This invention relates to the field of new energy vehicle charging technology, and in particular to a method, device, equipment and medium for identifying aging charging piles for new energy vehicles. Background Technology

[0002] With the rapid popularization of new energy vehicles, DC fast charging technology has become an important means to alleviate users' range anxiety. However, charging infrastructure inevitably ages during long-term, high-frequency use. Specifically, after repeated plugging and unplugging and long-term operation in harsh outdoor environments (high temperature, high humidity, salt spray, etc.), the metal contact surfaces of DC fast charging stations and vehicle charging sockets will experience wear, oxidation, or corrosion, leading to a significant increase in contact resistance. According to Joule's law, when contact resistance increases, the heat generated at the contact point will increase quadratically under high-current charging conditions. Abnormal temperature rise will trigger the charging station's built-in over-temperature protection mechanism, causing the charging station to actively reduce charging power or interrupt charging, seriously affecting users' charging efficiency and travel planning.

[0003] Currently, the monitoring of charging pile aging issues mainly relies on the following two methods: (1) Operator back-end data analysis method, that is, the charging pile operator collects historical charging data of the pile body (such as charging current, voltage, power curve and pile end temperature, etc.) through the back-end system, and uses big data algorithms to analyze the health status of the pile body. However, this method has high requirements for the accuracy of the pile end sensor and computing power, and the deployment cost is high; the analysis results are only for operators, and ordinary charging users cannot know them, resulting in serious information asymmetry. (2) User on-site subjective judgment method, that is, users subjectively judge by touching the charging gun head to sense the temperature or observing the charging power changes displayed on the vehicle screen at the charging site. This method lacks objective quantitative standards and the accuracy of judgment is extremely poor; users cannot distinguish whether the abnormal temperature rise is caused by vehicle end problems (such as vehicle socket, relay, cable aging) or charging pile end problems, and this method also requires users to actively operate and have professional knowledge, and does not have convenience and universality. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a method, device, equipment and medium for identifying aging charging piles for new energy vehicles, which can conveniently, objectively and accurately identify and warn of aging problems of charging piles.

[0005] The technical solution adopted by this invention to solve its technical problem is: to provide a method for new energy vehicles to identify aging charging piles, including the following steps:

[0006] A dynamic baseline temperature rise value for the vehicle is established based on the characteristic temperature rise values ​​extracted from historical charging records.

[0007] During charging, it is determined whether the DC charging current is within the preset charging current range and maintained for a first preset time.

[0008] If the DC charging current is within the preset charging current range and has been maintained for a first preset time, the current temperature value at the charging socket is collected, and the actual temperature rise value at the charging socket is calculated.

[0009] The actual temperature rise at the charging socket is compared with the dynamic baseline temperature rise, and the aging classification is determined based on the comparison result.

[0010] The establishment of the vehicle's dynamic baseline temperature rise value based on the feature temperature rise values ​​extracted from historical charging records specifically includes:

[0011] Retrieve the N most recent historical charging records since the current charging;

[0012] For each historical charging record, the difference between the temperature value at the vehicle charging socket and the temperature at the start of charging is extracted within a preset charging current range as a characteristic temperature rise value.

[0013] The dynamic baseline temperature rise value of the vehicle is obtained by weighted averaging of all the obtained characteristic temperature rise values.

[0014] The actual temperature rise at the charging socket is the difference between the current temperature at the charging socket and the initial temperature of the charging socket at the start of this charging.

[0015] The step of comparing the actual temperature rise at the charging socket with the dynamic baseline temperature rise and determining the aging status based on the comparison result specifically includes:

[0016] The temperature rise deviation value is obtained by calculating the difference between the actual temperature rise value at the charging socket and the dynamic baseline temperature rise value.

[0017] Determine whether the temperature rise deviation value exceeds the temperature rise deviation threshold and continues for more than a second preset time;

[0018] If the temperature rise deviation value exceeds the temperature rise deviation threshold and continues for more than the second preset time, it is preliminarily determined that the charging pile is in an aging state.

[0019] Once a charging station is preliminarily determined to be in an aging state, the following also applies:

[0020] It communicates with the charging pile in real time to obtain the current charging current;

[0021] Divide the actual temperature rise at the charging socket by the square of the current charging current to obtain the equivalent temperature rise coefficient.

[0022] If the difference between the equivalent temperature rise coefficient and the recent historical baseline of the equivalent temperature rise coefficient exceeds the equivalent temperature rise threshold, the charging pile is ultimately determined to be in an aging state.

[0023] When a charging station is determined to be aging and the temperature rise has caused the charging station to reduce its power output, a reminder will be sent to the user through the vehicle's human-machine interface.

[0024] The technical solution adopted by this invention to solve its technical problem is: to provide a device for identifying aging charging piles for new energy vehicles, comprising:

[0025] A module is established to create a dynamic baseline temperature rise value for the vehicle based on the feature temperature rise values ​​extracted from historical charging records.

[0026] The judgment module is used to determine whether the DC charging current is within the preset charging current range and has been maintained for a first preset time during charging.

[0027] The data acquisition and calculation module is used to acquire the current temperature value at the charging socket and calculate the actual temperature rise value at the charging socket when the DC charging current is within the preset charging current range and has been maintained for a first preset time.

[0028] The comparison and determination module is used to compare the actual temperature rise value at the charging socket with the dynamic baseline temperature rise value, and to determine the aging classification based on the comparison result.

[0029] The technical solution adopted by the present invention to solve its technical problem is: to provide an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the above-mentioned method for identifying aging charging piles for new energy vehicles.

[0030] The technical solution adopted by the present invention to solve its technical problem is: to provide a computer-readable storage medium on which a computer program is stored, wherein when the computer program is executed by a processor, the steps of the above-mentioned method for identifying aging charging piles for new energy vehicles are implemented.

[0031] Beneficial effects

[0032] By adopting the above-mentioned technical solution, this invention has the following advantages and positive effects compared with the prior art: This invention establishes a dynamic baseline temperature rise value based on historical charging data. Through longitudinal comparison, charging pile aging can be identified from the vehicle end. Furthermore, the method limits the charging current to a preset range and maintains it for a preset time before collecting the temperature, ensuring data comparability, improving the accuracy of aging attribution determination, and solving the information asymmetry pain point where car owners cannot distinguish whether slow charging is due to vehicle malfunction or charging pile aging. This invention utilizes only the storage capacity of the vehicle's existing temperature sensor and battery management system, implemented through software algorithms, without increasing hardware costs. It can operate independently in environments without a network, allowing car owners to automatically obtain the charging pile's health status without additional operation, alleviating range anxiety, and contributing to the formation of a market screening mechanism, promoting the improvement of charging facility service quality. Attached Figure Description

[0033] Figure 1 This is a flowchart of the method for identifying aging charging piles for new energy vehicles according to the first embodiment of the present invention. Detailed Implementation

[0034] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0035] The first embodiment of the present invention relates to a method for identifying aging charging piles for new energy vehicles, such as... Figure 1 As shown, it includes the following steps:

[0036] Step 1: Establish the vehicle's dynamic baseline temperature rise value based on the characteristic temperature rise values ​​extracted from historical charging records. This step specifically includes:

[0037] Retrieve the N most recent historical charging records since the current charging;

[0038] For each historical charging record, the difference between the temperature at the vehicle's charging socket and the temperature at the start of charging is extracted within a preset charging current range as a characteristic temperature rise value, i.e.: ,in, For the first Characteristic temperature rise values ​​from each historical charging record For the first Temperature values ​​at the vehicle's charging socket extracted from the previous historical charging records. For the first The temperature at the start of charging was extracted from the historical charging records. The preset charging current range refers to a period where the charging current is in a stable, high-current phase, with current fluctuations within ±5%.

[0039] The weighted average of all obtained characteristic temperature rise values ​​is used to obtain the vehicle's dynamic baseline temperature rise value, i.e.: ,in, This represents the vehicle's dynamic baseline temperature rise. For the first The weighting coefficient of the characteristic temperature rise value of each historical charging record can be set according to the time (e.g., the more recent the record, the higher the weighting coefficient). This dynamic baseline temperature rise value comprehensively reflects the inherent temperature rise caused by the inherent impedance characteristics of the vehicle's charging socket, internal high-voltage relay, and connecting cables. Although this dynamic baseline temperature rise value fluctuates, it exhibits stable characteristics in the short term (e.g., 1-3 months).

[0040] Step 2: During charging, determine whether the DC charging current is within the preset charging current range and has been maintained for a first preset time. The first preset time in this step can be set to 1 minute.

[0041] Step 3: If the DC charging current is within the preset charging current range and has been maintained for a first preset time, collect the current temperature value at the charging socket. And calculate the actual temperature rise at the charging socket. The actual temperature rise at the charging socket. This refers to the current temperature value at the charging socket. The initial temperature of the charging socket at the start of this charging session The difference, that is: .

[0042] Step 4: Calculate the actual temperature rise at the charging socket. With the dynamic baseline temperature rise value The comparisons are made, and the aging classification is determined based on the comparison results. The details are as follows:

[0043] First, calculate the actual temperature rise at the charging socket. With the dynamic baseline temperature rise value The difference is used to obtain the temperature rise deviation value. ,Right now: ;

[0044] Determine the temperature rise deviation value Whether the temperature rise deviation threshold has been exceeded and has continued for more than the second preset time; in this embodiment, the temperature rise deviation threshold can be set to 5°C and the second preset time can be set to 1 minute;

[0045] If the temperature rise deviation value The temperature rise deviation threshold has been exceeded, i.e. If the charging station remains in an aging state for more than the second preset time (i.e., 1 minute), it is preliminarily determined that the charging station is in an aging state, that is, the charging gun head or charging wire of the charging station has contact aging.

[0046] To further improve the accuracy of the determination, this embodiment, after initially determining that the charging pile is in an aging state, also includes:

[0047] First, real-time communication is established with the charging pile (e.g., a charging communication protocol based on the CAN bus) to obtain the current charging current. ;

[0048] Then, the actual temperature rise at the charging socket. Divide by the current charging current The square of the value yields the equivalent temperature rise coefficient. ,Right now: The equivalent temperature rise coefficient is essentially the product of contact resistance and thermal resistance. Since the inherent impedance of internal vehicle cables, relays, and sockets is stable over a short period, and the vehicle's charging interface, installation location, and surrounding materials remain essentially unchanged, the thermal resistance is approximately constant. There is a positive correlation with contact resistance, that is, when When a significant change occurs, after ruling out factors at the vehicle end, it can be reasonably inferred that the change originates from an increase in the contact resistance of the charging gun head or charging cable of the external charging station.

[0049] Finally, the equivalent temperature rise coefficient Compared with recent historical baseline equivalent temperature rise coefficient If the difference exceeds the equivalent temperature rise threshold, the charging pile is ultimately determined to be in an aging state.

[0050] When a charging station is determined to be aging and the temperature rise has caused the charging station to reduce its power, a reminder can be issued to the user through the vehicle's human-machine interface. The reminder may include, but is not limited to: "The current charging station gun may be aging, which may cause the charging speed to be limited. It is recommended to choose other charging stations in the future."

[0051] The present invention will be further illustrated by a specific embodiment below.

[0052] This embodiment uses a typical DC fast charging scenario as an example. It assumes that after a new energy vehicle completes its first charge at the beginning of its lifecycle, its BMS automatically records and stores the charging data for each DC fast charge. In the past 30 days, the vehicle underwent 8 DC fast charges. The BMS extracts the characteristic temperature rise value within the 200A-250A current range for each charge, and establishes a dynamic baseline temperature rise value after weighted averaging. =12℃.

[0053] One day, the car was charging at a public fast charging station. After entering the stable high-current stage (220A), the BMS monitored that the temperature of the charging socket rose from 25℃ to 43℃ within 3 minutes. =18℃. The calculated temperature rise deviation value is... =6℃, which exceeds 5℃ and lasts for more than 1 minute. At the same time, the vehicle detected that the charging power dropped from 80kW to 45kW.

[0054] The BMS (Battery Management System) determined that the charging gun head had aging contact and immediately displayed a prompt on the central control screen: "The current charging gun head may be aging, resulting in limited charging speed. It is recommended to choose other charging stations in the future."

[0055] Therefore, this invention uses the vehicle's recent charging history as a dynamic baseline. Since the impedance of the vehicle's internal high-voltage circuit is relatively constant in the short term, when a significant temperature rise deviates from the baseline, the only variable is the contact resistance of the charging gun head. This method accurately pinpoints the fault source to the charging pile, solving the problem of not being able to distinguish the heat source. This invention turns each new energy vehicle into a mobile charging pile health detection terminal. Without any additional operation or tools, vehicle owners can determine whether the charging pile has hidden aging problems affecting charging speed within a few minutes of waiting for charging, achieving a convenient and seamless technological effect.

[0056] The second embodiment of the present invention relates to a device for identifying aging charging piles for new energy vehicles, comprising:

[0057] A module is established to create a dynamic baseline temperature rise value for the vehicle based on the feature temperature rise values ​​extracted from historical charging records.

[0058] The judgment module is used to determine whether the DC charging current is within the preset charging current range and has been maintained for a first preset time during charging.

[0059] The data acquisition and calculation module is used to acquire the current temperature value at the charging socket and calculate the actual temperature rise value at the charging socket when the DC charging current is within the preset charging current range and has been maintained for a first preset time.

[0060] The comparison and determination module is used to compare the actual temperature rise value at the charging socket with the dynamic baseline temperature rise value, and to determine the aging classification based on the comparison result.

[0061] The establishment module includes:

[0062] The acquisition unit is used to acquire the N most recent historical charging records since the current charging.

[0063] The calculation unit is used to extract the temperature difference between the vehicle charging socket and the temperature at the start of charging for each historical charging record within a preset charging current range as a characteristic temperature rise value.

[0064] The weighted average unit is used to perform weighted average processing on all the obtained characteristic temperature rise values ​​to obtain the dynamic baseline temperature rise value of the vehicle.

[0065] The actual temperature rise at the charging socket is the difference between the current temperature at the charging socket and the initial temperature of the charging socket at the start of this charging.

[0066] The comparison and determination module includes:

[0067] The temperature rise deviation calculation unit is used to calculate the difference between the actual temperature rise value at the charging socket and the dynamic baseline temperature rise value to obtain the temperature rise deviation value.

[0068] The judgment unit is used to determine whether the temperature rise deviation value exceeds the temperature rise deviation threshold and continues to exceed the second preset time.

[0069] The preliminary determination unit is used to preliminarily determine that the charging pile is in an aging state when the temperature rise deviation value exceeds the temperature rise deviation threshold and continues for more than a second preset time.

[0070] The comparison and determination module further includes:

[0071] A real-time communication unit is used to communicate with the charging pile in real time to obtain the current charging current;

[0072] The equivalent temperature rise coefficient calculation unit is used to divide the actual temperature rise value at the charging socket by the square of the current charging current to obtain the equivalent temperature rise coefficient.

[0073] The final determination unit is used to determine that the charging pile is in an aging state if the difference between the equivalent temperature rise coefficient and the recent historical equivalent temperature rise coefficient baseline exceeds the equivalent temperature rise threshold.

[0074] The device for identifying aging charging piles for new energy vehicles also includes a reminder module, which is used to issue a reminder to the user through the vehicle human-machine interface when the charging pile is determined to be aging and the temperature rise has caused the charging pile to reduce its power.

[0075] It's easy to see that by establishing a dynamic baseline temperature rise value based on historical charging data, charging pile aging can be identified from the vehicle side through longitudinal comparison. Furthermore, the method limits the charging current to a preset range and maintains it for a preset time before collecting temperature, ensuring data comparability, improving the accuracy of aging attribution, and solving the information asymmetry pain point where car owners cannot distinguish whether slow charging is due to vehicle malfunction or charging pile aging. This invention utilizes only the vehicle's existing temperature sensor and battery management system's storage capacity, implemented through software algorithms, without increasing hardware costs. It can operate independently in environments without a network, allowing car owners to automatically know the charging pile's health status without additional operation, alleviating range anxiety, and contributing to the formation of a market screening mechanism to promote the improvement of charging facility service quality.

[0076] The third embodiment of the present invention relates to an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the method for identifying aging charging piles for new energy vehicles according to the first embodiment.

[0077] The fourth embodiment of the present invention relates to a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of the method for identifying aging charging piles for new energy vehicles according to the first embodiment.

[0078] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product implemented on one or more computer-usable storage media (including, but not limited to, disk storage and optical storage) containing computer-usable program code.

[0079] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0080] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction methods implemented in a process. Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0081] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0082] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for identifying aging charging piles for new energy vehicles, characterized in that, Includes the following steps: A dynamic baseline temperature rise value for the vehicle is established based on the characteristic temperature rise values ​​extracted from historical charging records. During charging, it is determined whether the DC charging current is within the preset charging current range and maintained for a first preset time. If the DC charging current is within the preset charging current range and has been maintained for a first preset time, the current temperature value at the charging socket is collected, and the actual temperature rise value at the charging socket is calculated. The actual temperature rise at the charging socket is compared with the dynamic baseline temperature rise, and the aging classification is determined based on the comparison result.

2. The method for identifying aging charging piles for new energy vehicles according to claim 1, characterized in that, The establishment of the vehicle's dynamic baseline temperature rise value based on the feature temperature rise values ​​extracted from historical charging records specifically includes: Retrieve the N most recent historical charging records since the current charging; For each historical charging record, the difference between the temperature value at the vehicle charging socket and the temperature at the start of charging is extracted within a preset charging current range as a characteristic temperature rise value. The dynamic baseline temperature rise value of the vehicle is obtained by weighted averaging of all the obtained characteristic temperature rise values.

3. The method for identifying aging charging piles for new energy vehicles according to claim 1, characterized in that, The actual temperature rise at the charging socket is the difference between the current temperature at the charging socket and the initial temperature of the charging socket at the start of this charging.

4. The method for identifying aging charging piles for new energy vehicles according to claim 1, characterized in that, The step of comparing the actual temperature rise at the charging socket with the dynamic baseline temperature rise and determining the aging status based on the comparison result specifically includes: The temperature rise deviation value is obtained by calculating the difference between the actual temperature rise value at the charging socket and the dynamic baseline temperature rise value. Determine whether the temperature rise deviation value exceeds the temperature rise deviation threshold and continues for more than a second preset time; If the temperature rise deviation value exceeds the temperature rise deviation threshold and continues for more than the second preset time, it is preliminarily determined that the charging pile is in an aging state.

5. The method for identifying aging charging piles for new energy vehicles according to claim 4, characterized in that, Once a charging station is preliminarily determined to be in an aging state, the following also applies: It communicates with the charging pile in real time to obtain the current charging current; Divide the actual temperature rise at the charging socket by the square of the current charging current to obtain the equivalent temperature rise coefficient. If the difference between the equivalent temperature rise coefficient and the recent historical baseline of the equivalent temperature rise coefficient exceeds the equivalent temperature rise threshold, the charging pile is ultimately determined to be in an aging state.

6. The method for identifying aging charging piles for new energy vehicles according to claim 1, characterized in that, When a charging station is determined to be aging and the temperature rise has caused the charging station to reduce its power output, a reminder will be sent to the user through the vehicle's human-machine interface.

7. A device for identifying aging charging piles for new energy vehicles, characterized in that, include: A module is established to create a dynamic baseline temperature rise value for the vehicle based on the feature temperature rise values ​​extracted from historical charging records. The judgment module is used to determine whether the DC charging current is within the preset charging current range and has been maintained for a first preset time during charging. The data acquisition and calculation module is used to acquire the current temperature value at the charging socket and calculate the actual temperature rise value at the charging socket when the DC charging current is within the preset charging current range and has been maintained for a first preset time. The comparison and determination module is used to compare the actual temperature rise value at the charging socket with the dynamic baseline temperature rise value, and to determine the aging classification based on the comparison result.

8. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the method for identifying aging charging piles for new energy vehicles as described in any one of claims 1-6.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the steps of the method for identifying aging charging piles for new energy vehicles as described in any one of claims 1-6.

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