Direct-current charging pile and filter screen blockage detection device and method thereof

Abstract

The invention discloses a direct-current charging pile and a filter screen blockage detection device and method thereof. The detection device comprises a temperature acquisition unit, a storage unit and a control unit, the temperature acquisition unit is used for acquiring charging temperature data during each charging; the storage unit is used for storing a preset charging pile filter screen state database; the control unit is used for acquiring the charging duration and the charging power of each time of charging; and judging the state of the filter screen of the charging pile according to the charging duration, the charging power and the charging temperature data during the same charging and the state database of the filter screen of the charging pile. The state of the filter screen can be automatically detected, the problems that the heat dissipation effect is poor and the charging pile quits operation due to the fact that the filter screen is not replaced in time are solved, and the problems that the operation and maintenance efficiency is low and the cost is high due to the fact that the filter screen is excessively cleaned or the protection level is improved are solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of charging pile maintenance, and in particular relates to a DC charging pile and a filter clogging detection device and method thereof. Background Art

[0002] Charging piles are the energy source of new energy vehicles. Their main function is to convert external power and provide stable and reliable power for new energy vehicles. DC charging piles generate a lot of heat during the power conversion process and need to be equipped with a heat dissipation system. However, DC charging piles are generally set up outdoors, with a harsh working environment and many external restrictions such as catkins and dust. It is necessary to set filters at the heat dissipation ports for isolation, but there is still the problem of filter clogging, which needs to be cleaned in time.

[0003] With the continuous rise of the stock market of charging piles, the daily maintenance of charging piles will be an unavoidable issue. In the process of daily maintenance of charging piles, regular cleaning and replacement of filters are the focus of maintenance work, which requires charging station operators to invest a lot of manpower and material resources. It is of great significance to put charging piles with filter blockage warning function into use.

[0004] At present, on the one hand, the cooling system is optimized by changing the cabinet structure of the charging pile and optimizing the filter configuration, but there are still problems such as filter clogging and the need for regular replacement, which leads to untimely filter replacement, poor cooling effect, and the charging pile being out of operation; at the same time, excessive cleaning and replacement of filters wastes manpower and financial resources. On the other hand, by improving the protection level of the charging pile and improving the liquid cooling method, there are problems such as large equipment investment, high cost, and low economic benefits of station construction and operation. Summary of the invention

[0005] The object of the present invention is to provide a DC charging pile and its filter clogging detection device and method, so as to solve at least one of the problems of poor heat dissipation and charging pile exiting operation due to untimely replacement of the charging pile filter, and low operation and maintenance efficiency and high cost due to excessive cleaning of the filter or improvement of the protection level.

[0006] The present invention solves the above technical problems through the following technical solutions: a DC charging pile filter blockage detection device, the detection device comprising:

[0007] A temperature collection unit, used to collect charging temperature data during each charging; wherein the charging temperature data includes the charging pile ambient temperature, the charging pile air inlet temperature at the beginning of charging, and the charging pile air outlet temperature at the end of charging;

[0008] A storage unit, used to store a preset charging pile filter status database; wherein the charging pile filter status database includes a temperature difference threshold value of the charging pile charging for a certain period of time under different ambient temperatures and different charging powers, and the temperature difference threshold value is equal to the difference between the charging pile outlet temperature at the end of charging under the corresponding ambient temperature and the corresponding charging power and the charging pile inlet temperature at the start of charging;

[0009] The control unit is used to obtain the charging time and charging power of each charging; and judge the charging pile filter status according to the charging time, charging power, charging temperature data of the same charging and the charging pile filter status database.

[0010] Furthermore, the control unit is used to determine the status of the charging pile filter according to the charging time, charging power, charging temperature data and the charging pile filter status database during the same charging, specifically including:

[0011] Determine whether the data of the corresponding charging is valid data according to the ambient temperature of the charging pile, the charging time and the charging power during each charging and the charging pile filter status database; if not, discard the data of the corresponding charging;

[0012] If yes, determine the first temperature difference threshold from the charging pile filter status database according to the charging pile ambient temperature, charging duration and charging power during the corresponding charging;

[0013] Calculating a first temperature difference according to the temperature of the charging pile air outlet and the temperature of the charging pile air inlet during the corresponding charging;

[0014] The state of the charging pile filter is determined according to the first temperature difference and the first temperature difference threshold.

[0015] Preferably, the control unit is used to determine whether the data at the corresponding charging time is valid data according to the charging pile ambient temperature, charging time and charging power at each charging time and the charging pile filter status database, specifically including:

[0016] Determine whether there is data of the same working condition in the charging pile filter status database according to the charging pile ambient temperature and charging power during each charging and the ambient temperature and charging power in the charging pile filter status database;

[0017] If there is data of the same working condition, it is determined whether the charging time of the corresponding charging is greater than or equal to the charging time of the data of the same working condition in the charging pile filter status database. If so, the data of the corresponding charging is valid data; otherwise, the data of the corresponding charging is invalid data;

[0018] If there is no data for the same operating condition, the data for the corresponding charge is invalid.

[0019] Furthermore, the control unit is used to determine the status of the charging pile filter according to the charging time, charging power, charging temperature data and the charging pile filter status database during the same charging, specifically including:

[0020] Select valid charging data from charging data within a period of time according to the ambient temperature, charging power and charging time corresponding to the temperature difference threshold in the charging pile filter status database; wherein the charging data includes charging temperature data, charging time and charging power during each charging;

[0021] Calculate a second temperature difference according to the charging pile air outlet temperature and the charging pile air inlet temperature in the valid charging data;

[0022] The status of the charging pile filter is determined based on the second temperature difference and the temperature difference threshold.

[0023] Based on the same concept, the present invention provides a method for detecting filter blockage of a DC charging pile, comprising:

[0024] Constructing a charging pile filter status database; wherein the charging pile filter status database includes a temperature difference threshold value when the charging pile is charged for a certain period of time under different ambient temperatures and different charging powers, and the temperature difference threshold value is equal to the difference between the charging pile outlet temperature at the end of charging under the corresponding ambient temperature and the corresponding charging power and the charging pile inlet temperature at the start of charging;

[0025] Obtain charging data for each charging; wherein the charging data includes charging time, charging power and charging temperature data; the charging temperature data includes the charging pile ambient temperature, the charging pile air inlet temperature at the start of charging and the charging pile air outlet temperature at the end of charging;

[0026] The charging pile filter status is determined according to the charging data during the same charging and the charging pile filter status database.

[0027] Further, judging the status of the charging pile filter according to the charging data during the same charging and the charging pile filter status database includes:

[0028] Determine whether the charging data of the corresponding charging is valid data according to the charging data of each charging and the charging pile filter status database; if not, discard the charging data of the corresponding charging;

[0029] If yes, determine the first temperature difference threshold from the charging pile filter status database according to the charging pile ambient temperature, charging duration and charging power during the corresponding charging;

[0030] Calculating a first temperature difference according to the temperature of the charging pile air outlet and the temperature of the charging pile air inlet during the corresponding charging;

[0031] The state of the charging pile filter is determined according to the first temperature difference and the first temperature difference threshold.

[0032] Further, judging whether the charging data at the corresponding charging time is valid data according to the charging data at each charging time and the charging pile filter status database specifically includes:

[0033] Determine whether there is data of the same working condition in the charging pile filter status database according to the charging pile ambient temperature and charging power during each charging and the ambient temperature and charging power in the charging pile filter status database;

[0034] If there is data of the same working condition, it is determined whether the charging time of the corresponding charging is greater than or equal to the charging time of the data of the same working condition in the charging pile filter status database. If so, the charging data of the corresponding charging is valid data; otherwise, the charging data of the corresponding charging is invalid data;

[0035] If there is no data for the same operating condition, the charging data for the corresponding charging is invalid data.

[0036] Further, judging the state of the charging pile filter according to the first temperature difference and the first temperature difference threshold specifically includes:

[0037] When (1-r1%)ΔT T1 ≤ΔT1≤(1+r1%)ΔT T1 When the charging pile filter is in a healthy state;

[0038] When ΔT T1 ×r2%≤|ΔT1-ΔT T1 |, the charging pile filter is slightly clogged and needs to be cleaned;

[0039] When ΔT T1 ×r3%≤|ΔT1-ΔT T1 |, the charging pile filter is in a serious clogged state and needs to be replaced;

[0040] Wherein, ΔT1 represents the first temperature difference; ΔT T1 represents the first temperature difference threshold; r1, r2, r3 represent percentage thresholds respectively, and r1<r2<r3.

[0041] Further, judging the status of the charging pile filter according to the charging data during the same charging and the charging pile filter status database includes:

[0042] Select valid charging data from the charging data within a period of time according to the ambient temperature, charging power and charging time corresponding to the temperature difference threshold in the charging pile filter status database;

[0043] Calculate a second temperature difference according to the charging pile air outlet temperature and the charging pile air inlet temperature in the valid charging data;

[0044] The status of the charging pile filter is determined based on the second temperature difference and the temperature difference threshold.

[0045] Further, judging the state of the charging pile filter according to the second temperature difference and the temperature difference threshold specifically includes:

[0046] When (1-r1%)ΔT T ≤ΔT2≤(1+r1%)ΔT T When the charging pile filter is in a healthy state;

[0047] When ΔT T ×r2%≤|ΔT2-ΔT T |, the charging pile filter is slightly clogged and needs to be cleaned;

[0048] When ΔT T ×r3%≤|ΔT2-ΔT T |, the charging pile filter is in a serious clogged state and needs to be replaced;

[0049] Wherein, ΔT2 represents the second temperature difference; ΔT T represents the temperature difference threshold; r1, r2, and r3 represent percentage thresholds respectively, and r1<r2<r3.

[0050] Based on the same concept, the present invention also provides a DC charging pile, which includes the DC charging pile filter clogging detection device as described above.

[0051] Beneficial Effects

[0052] Compared with the prior art, the advantages of the present invention are:

[0053] The present invention can detect the status of the charging pile filter according to the charging data of each charging and the charging pile filter status database, and then clean or replace the filter according to the status of the filter, thereby realizing automatic and real-time detection of the filter status. It not only avoids the problem of poor heat dissipation and charging pile exiting operation due to untimely replacement of the filter, but also avoids the problem of low operation and maintenance efficiency and high cost due to excessive cleaning of the filter or improvement of the protection level.

[0054] The present invention can also detect the status of the charging pile filter according to the charging data within a period of time and the charging pile filter status database, and then clean or replace the filter according to the filter status, thereby realizing automatic detection of the filter status, improving the efficiency of filter status detection, reducing the investment in manpower and material resources, and improving the economic benefits of charging station operation. It not only avoids the problem of poor heat dissipation and charging pile exiting operation due to untimely filter replacement, but also avoids the problem of low operation and maintenance efficiency and high cost due to excessive cleaning of the filter or improvement of the protection level. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] In order to more clearly illustrate the technical solution of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only one embodiment of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0056] Figure 1 is a structural block diagram of a DC charging pile filter blockage detection device in an embodiment of the present invention;

[0057] Figure 2 It is a flow chart of a method for detecting filter blockage of a DC charging pile in an embodiment of the present invention. DETAILED DESCRIPTION

[0058] The following is a clear and complete description of the technical solutions in the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0059] The technical solution of the present application is described in detail with specific embodiments below. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0060] Example 1

[0061] like Figure 1 As shown, a DC charging pile filter clogging detection device provided by an embodiment of the present invention includes a temperature acquisition unit, a storage unit and a control unit; the temperature acquisition unit and the storage unit are respectively connected to the control unit.

[0062] The temperature acquisition unit is used to collect charging temperature data each time charging; wherein the charging temperature data includes the ambient temperature of the charging pile, the air inlet temperature of the charging pile at the beginning of charging, and the air outlet temperature of the charging pile at the end of charging. In this embodiment, the temperature acquisition unit includes a first temperature sensor, a second temperature sensor, and a third temperature sensor, wherein the first temperature sensor is disposed in the environment where the charging pile is located and is used to collect the ambient temperature of the charging pile each time charging is performed, the second temperature sensor is disposed at the air inlet on the charging pile cabinet and is used to collect the air inlet temperature of the charging pile at the beginning of charging each time charging is performed, and the third temperature sensor is disposed at the air outlet on the charging pile cabinet and is used to collect the air outlet temperature of the charging pile at the end of charging each time charging is performed.

[0063] During each charging, the control unit records the charging time and the charging power. Therefore, during each charging, the charging data acquired by the control unit includes the charging time, the charging power and the charging temperature data.

[0064] The storage unit is used to store a preset charging pile filter status database. The charging pile filter status database is pre-constructed and stored in the storage unit. The charging pile filter status database includes a temperature difference threshold when the charging pile is charged for a certain period of time under different ambient temperatures and different charging powers. The temperature difference threshold is equal to the difference between the charging pile outlet temperature at the end of charging under the corresponding ambient temperature and the corresponding charging power and the charging pile inlet temperature at the beginning of charging. In a specific embodiment of the present invention, the specific construction process of the charging pile filter status database is:

[0065] Step A1: Determine the operating ambient temperature range of the charging pile and the number of charging guns of the charging pile.

[0066] In this embodiment, the working environment temperature range of the charging pile is -20°C to 50°C, and usually the number of charging guns of a single charging pile is 2.

[0067] Step A2: Determine the working condition of the charging pile according to the working environment temperature range of the charging pile and the number of charging guns of the charging pile.

[0068] The working environment temperature range is divided into levels of 1°C each, resulting in multiple ambient temperature levels. The charging power is divided according to the number of charging guns of the charging pile, resulting in multiple charging power levels. Multiple charging pile working conditions are obtained according to different ambient temperature levels and charging power levels.

[0069] Exemplarily, if the number n of charging guns of the charging pile is 2, the charging power is P / 2 and P, where P represents full power, that is, the charging power when one charging gun is working and the charging power when two charging guns are working at the same time.

[0070] Step A3: Under each charging pile working condition, the charging pile is charged for Kt minutes, and the charging pile air inlet temperature at the beginning of charging and the charging pile air outlet temperature at the end of charging are detected.

[0071] Under normal circumstances, the charging time of an electric vehicle is 30 to 40 minutes, and the charging pile has not yet reached the thermal stability stage. Taking comprehensive considerations, Kt is the time when the charging pile is in the temperature rise stage and is suitable for most working scenarios. In this embodiment, Kt is set to 20 minutes.

[0072] Step A4: Calculate the difference between the air outlet temperature of the charging pile at the end of charging under each charging pile working condition and the air inlet temperature of the charging pile at the start of charging to obtain the temperature difference threshold under each charging working condition;

[0073] Step A5: Construct a charging pile filter status database according to the temperature difference threshold under each charging condition, as shown in Table 1.

[0074] Table 1 Charging pile filter status database

[0075]

[0076] When detecting the temperature of the charging pile outlet at the end of charging and the temperature of the charging pile inlet at the beginning of charging, multiple detections can be performed, and then the average of the multiple detected temperatures is used as the final temperature. For example, for the temperature of the charging pile inlet at the beginning of charging, the temperature of the charging pile inlet is detected once at the start time t of charging, the temperature of the charging pile inlet is detected once at t+1s, the temperature of the charging pile inlet is detected once at t+2s, the temperature of the charging pile inlet is detected once at t+3s, the temperature of the charging pile inlet is detected once at t+4s, and the temperature of the charging pile inlet is detected once at t+5s. The average of these charging pile inlet temperatures is calculated, and the average is used as the final charging pile inlet temperature.

[0077] The control unit is used to determine the status of the charging pile filter according to the charging data during the same charging and the charging pile filter status database. In a specific embodiment of the present invention, the control unit is used to determine the status of the charging pile filter according to the charging time, charging power, charging temperature data during the same charging and the charging pile filter status database, specifically including:

[0078] According to the charging pile ambient temperature, charging time and charging power at each charging time and the charging pile filter status database, it is determined whether the data at the corresponding charging time is valid data; if not, the data at the corresponding charging time is discarded;

[0079] If so, determine the first temperature difference threshold from the charging pile filter status database according to the charging pile ambient temperature, charging time and charging power during the corresponding charging; calculate the first temperature difference according to the charging pile outlet temperature and the charging pile inlet temperature during the corresponding charging; and judge the charging pile filter status based on the first temperature difference and the first temperature difference threshold.

[0080] In a specific embodiment of the present invention, the control unit is used to determine whether the data at the corresponding charging time is valid data according to the charging pile ambient temperature, charging time and charging power at each charging time and the charging pile filter status database, specifically including:

[0081] According to the charging pile ambient temperature and charging power during each charging and the ambient temperature and charging power in the charging pile filter status database, it is determined whether there is data of the same working condition in the charging pile filter status database;

[0082] If there is data with the same operating condition, determine whether the charging time of the corresponding charging is greater than or equal to the charging time of the data with the same operating condition in the charging pile filter status database. If so, the data of the corresponding charging is valid data; otherwise, the data of the corresponding charging is invalid data; if there is no data with the same operating condition, the data of the corresponding charging is invalid data.

[0083] For example, assuming that the ambient temperature of the charging pile during a certain charging is 25°C, the charging time is 23 minutes, and the charging power is P / 2, the corresponding operating conditions are found in the charging pile filter status database according to the ambient temperature of the charging pile being 25°C and the charging power being P / 2 (i.e. the operating conditions corresponding to the ambient temperature of 25°C and the charging power being P / 2 in Table 1), and then the charging time is 23 minutes>Kt (Kt=20), then the charging data during this charging is valid data.

[0084] For example, assuming that the ambient temperature of the charging pile during a certain charging is 25°C, the charging time is 18 minutes, and the charging power is P / 2, the corresponding operating conditions are found in the charging pile filter status database according to the ambient temperature of the charging pile being 25°C and the charging power being P / 2 (i.e. the operating conditions corresponding to the ambient temperature of 25°C and the charging power being P / 2 in Table 1), and then the charging time is 18 minutes < Kt (Kt = 20), then the charging data during this charging is invalid data.

[0085] In a specific embodiment of the present invention, the control unit is used to determine the state of the charging pile filter according to the first temperature difference and the first temperature difference threshold, specifically including:

[0086] When (1-r1%)ΔT T1 ≤ΔT1≤(1+r1%)ΔT T1 When the charging pile filter is in a healthy state;

[0087] When ΔTT1 ×r2%≤|ΔT1-ΔT T1 |, the charging pile filter is slightly clogged and needs to be cleaned;

[0088] When ΔT T1 ×r3%≤|ΔT1-ΔT T1 |, the charging pile filter is in a serious clogged state and needs to be replaced;

[0089] Wherein, ΔT1 represents the first temperature difference; ΔT T1 represents the first temperature difference threshold; r1, r2, r3 represent percentage thresholds respectively, and r1<r2<r3. In this embodiment, r1=5, r2=10, r3=15.

[0090] In another embodiment of the present invention, the control unit is used to determine the status of the charging pile filter according to the charging time, charging power, charging temperature data and the charging pile filter status database during the same charging, specifically including:

[0091] Select valid charging data from the charging data within a period of time according to the ambient temperature, charging power and charging time corresponding to the temperature difference threshold in the charging pile filter status database; calculate the second temperature difference according to the charging pile outlet temperature and the charging pile inlet temperature in the valid charging data; judge the charging pile filter status according to the second temperature difference and the temperature difference threshold.

[0092] Exemplarily, a period of time is 1 day, and there are charging data of N charging times within 1 day. The charging data of a single charge that has the same operating condition as a certain operating condition in the charging pile filter status database and a charging time greater than or equal to Kt corresponding to the operating condition is screened out from the charging data of the N charging times. The charging data of this charging time is used as the valid charging data, and the second temperature difference is calculated based on the valid charging data. The second temperature difference is compared with the temperature difference threshold corresponding to the operating condition to determine the status of the charging pile filter.

[0093] In a specific embodiment of the present invention, the control unit is used to determine the state of the charging pile filter according to the second temperature difference and the temperature difference threshold, specifically including:

[0094] When (1-r1%)ΔT T ≤ΔT2≤(1+r1%)ΔT T When the charging pile filter is in a healthy state;

[0095] When ΔT T ×r2%≤|ΔT2-ΔT T |, the charging pile filter is slightly clogged and needs to be cleaned;

[0096] When ΔT T ×r3%≤|ΔT2-ΔT T|, the charging pile filter is in a serious clogged state and needs to be replaced;

[0097] Wherein, ΔT2 represents the second temperature difference; ΔT T represents the temperature difference threshold; r1, r2, and r3 represent percentage thresholds respectively, and r1<r2<r3.

[0098] Example 2

[0099] like Figure 2 As shown, a DC charging pile filter blockage detection method provided by an embodiment of the present invention includes the following steps:

[0100] Step 1: Build a charging pile filter status database.

[0101] The charging pile filter status database includes the temperature difference threshold of the charging pile under different ambient temperatures and different charging powers for a certain period of time. The temperature difference threshold is equal to the difference between the charging pile outlet temperature at the end of charging under the corresponding ambient temperature and the corresponding charging power and the charging pile inlet temperature at the beginning of charging. In a specific embodiment of the present invention, the specific construction process of the charging pile filter status database is:

[0102] Step A1: Determine the operating ambient temperature range of the charging pile and the number of charging guns of the charging pile.

[0103] In this embodiment, the working environment temperature range of the charging pile is -20°C to 50°C, and usually the number of charging guns of a single charging pile is 2.

[0104] Step A2: Determine the working condition of the charging pile according to the working environment temperature range of the charging pile and the number of charging guns of the charging pile.

[0105] The working environment temperature range is divided into levels of 1°C each, resulting in multiple ambient temperature levels. The charging power is divided according to the number of charging guns of the charging pile, resulting in multiple charging power levels. Multiple charging pile working conditions are obtained according to different ambient temperature levels and charging power levels.

[0106] Exemplarily, if the number n of charging guns of the charging pile is 2, the charging power is P / 2 and P, where P represents full power, that is, the charging power when one charging gun is working and the charging power when two charging guns are working at the same time.

[0107] Step A3: Under each charging pile working condition, the charging pile is charged for Kt minutes, and the charging pile air inlet temperature at the beginning of charging and the charging pile air outlet temperature at the end of charging are detected.

[0108] Under normal circumstances, the charging time of an electric vehicle is 30 to 40 minutes, and the charging pile has not yet reached the thermal stability stage. Taking comprehensive considerations, Kt is the time when the charging pile is in the temperature rise stage and is suitable for most working scenarios. In this embodiment, Kt is set to 20 minutes.

[0109] Step A4: Calculate the difference between the air outlet temperature of the charging pile at the end of charging under each charging pile working condition and the air inlet temperature of the charging pile at the start of charging to obtain the temperature difference threshold under each charging working condition;

[0110] Step A5: Construct a charging pile filter status database according to the temperature difference threshold under each charging condition, as shown in Table 1.

[0111] Step 2: Get the charging data for each charge.

[0112] The charging data includes charging time, charging power and charging temperature data; the charging temperature data includes the ambient temperature of the charging pile, the air inlet temperature of the charging pile at the start of charging and the air outlet temperature of the charging pile at the end of charging. The temperature acquisition unit is used to collect the charging temperature data each time charging. In this embodiment, the temperature acquisition unit includes a first temperature sensor, a second temperature sensor and a third temperature sensor. The first temperature sensor is arranged in the environment where the charging pile is located and is used to collect the ambient temperature of the charging pile each time charging. The second temperature sensor is arranged at the air inlet on the charging pile cabinet and is used to collect the air inlet temperature of the charging pile at the start of charging each time charging. The third temperature sensor is arranged at the air outlet on the charging pile cabinet and is used to collect the air outlet temperature of the charging pile at the end of charging each time charging.

[0113] During each charging, the control unit also records the charging time and charging power.

[0114] Step 3: Determine the status of the charging pile filter according to the charging data of the same charging and the charging pile filter status database.

[0115] There are two implementation methods for judging the status of the charging pile filter based on the charging data of the same charging and the charging pile filter status database. The first is to judge the status of the charging pile filter in real time based on the charging data of each charging; the second is to judge the status of the charging pile filter based on the charging data of a certain charging among the charging data of multiple charging within a period of time.

[0116] In a first specific implementation of the present invention, judging the status of the charging pile filter according to the charging data during the same charging and the charging pile filter status database specifically includes:

[0117] According to the charging pile ambient temperature, charging time and charging power at each charging time and the charging pile filter status database, it is determined whether the data at the corresponding charging time is valid data; if not, the data at the corresponding charging time is discarded;

[0118] If so, determine the first temperature difference threshold from the charging pile filter status database according to the charging pile ambient temperature, charging time and charging power during the corresponding charging; calculate the first temperature difference according to the charging pile outlet temperature and the charging pile inlet temperature during the corresponding charging; and judge the charging pile filter status based on the first temperature difference and the first temperature difference threshold.

[0119] In a specific embodiment of the present invention, judging whether the data of the corresponding charging is valid data according to the charging pile ambient temperature, charging time and charging power during each charging and the charging pile filter status database specifically includes:

[0120] According to the charging pile ambient temperature and charging power during each charging and the ambient temperature and charging power in the charging pile filter status database, it is determined whether there is data of the same working condition in the charging pile filter status database;

[0121] If there is data with the same operating condition, determine whether the charging time of the corresponding charging is greater than or equal to the charging time of the data with the same operating condition in the charging pile filter status database. If so, the data of the corresponding charging is valid data; otherwise, the data of the corresponding charging is invalid data; if there is no data with the same operating condition, the data of the corresponding charging is invalid data.

[0122] For example, assuming that the ambient temperature of the charging pile during a certain charging is 25°C, the charging time is 23 minutes, and the charging power is P / 2, the corresponding operating conditions are found in the charging pile filter status database according to the ambient temperature of the charging pile being 25°C and the charging power being P / 2 (i.e. the operating conditions corresponding to the ambient temperature of 25°C and the charging power being P / 2 in Table 1), and then the charging time is 23 minutes>Kt (Kt=20), then the charging data during this charging is valid data.

[0123] For example, assuming that the ambient temperature of the charging pile during a certain charging is 25°C, the charging time is 18 minutes, and the charging power is P / 2, the corresponding operating conditions are found in the charging pile filter status database according to the ambient temperature of the charging pile being 25°C and the charging power being P / 2 (i.e. the operating conditions corresponding to the ambient temperature of 25°C and the charging power being P / 2 in Table 1), and then the charging time is 18 minutes < Kt (Kt = 20), then the charging data during this charging is invalid data.

[0124] In a specific embodiment of the present invention, judging the state of the charging pile filter according to the first temperature difference and the first temperature difference threshold specifically includes:

[0125] When (1-r1%)ΔT T1 ≤ΔT1≤(1+r1%)ΔT T1 When the charging pile filter is in a healthy state;

[0126] When ΔT T1 ×r2%≤|ΔT1-ΔT T1 |, the charging pile filter is slightly clogged and needs to be cleaned;

[0127] When ΔT T1 ×r3%≤|ΔT1-ΔT T1 |, the charging pile filter is in a serious clogged state and needs to be replaced;

[0128] Wherein, ΔT1 represents the first temperature difference; ΔT T1 represents the first temperature difference threshold; r1, r2, r3 represent percentage thresholds respectively, and r1<r2<r3. In this embodiment, r1=5, r2=10, r3=15.

[0129] In a second specific implementation of the present invention, judging the status of the charging pile filter according to the charging data during the same charging and the charging pile filter status database specifically includes:

[0130] Select valid charging data from the charging data within a period of time according to the ambient temperature, charging power and charging time corresponding to the temperature difference threshold in the charging pile filter status database; calculate the second temperature difference according to the charging pile outlet temperature and the charging pile inlet temperature in the valid charging data; judge the charging pile filter status according to the second temperature difference and the temperature difference threshold.

[0131] Exemplarily, a period of time is 1 day, and there are charging data of N charging times within 1 day. The charging data of a single charge that has the same operating condition as a certain operating condition in the charging pile filter status database and a charging time greater than or equal to Kt corresponding to the operating condition is screened out from the charging data of the N charging times. The charging data of this charging time is used as the valid charging data, and the second temperature difference is calculated based on the valid charging data. The second temperature difference is compared with the temperature difference threshold corresponding to the operating condition to determine the status of the charging pile filter.

[0132] In a specific embodiment of the present invention, judging the state of the charging pile filter according to the second temperature difference and the temperature difference threshold specifically includes:

[0133] When (1-r1%)ΔT T ≤ΔT2≤(1+r1%)ΔT T When the charging pile filter is in a healthy state;

[0134] When ΔT T ×r2%≤|ΔT2-ΔT T |, the charging pile filter is slightly clogged and needs to be cleaned;

[0135] When ΔT T ×r3%≤|ΔT2-ΔT T|, the charging pile filter is in a serious clogged state and needs to be replaced;

[0136] Wherein, ΔT2 represents the second temperature difference; ΔT T represents the temperature difference threshold; r1, r2, and r3 represent percentage thresholds respectively, and r1<r2<r3.

[0137] In a specific embodiment of the present invention, when the charging pile filter is in a slightly blocked state or a severely blocked state, an alarm is issued to prompt that the filter needs to be cleaned or replaced.

[0138] What is disclosed above is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or modifications within the technical scope disclosed in the present invention, which should be covered within the protection scope of the present invention.

Claims

1. A DC charging pile filter blockage detection device, characterized in that: The detection device comprises: A temperature collection unit, used to collect charging temperature data during each charging; wherein the charging temperature data includes the charging pile ambient temperature, the charging pile air inlet temperature at the beginning of charging, and the charging pile air outlet temperature at the end of charging; A storage unit, used to store a preset charging pile filter status database; wherein the charging pile filter status database includes a temperature difference threshold value of the charging pile charging for a certain period of time under different ambient temperatures and different charging powers, and the temperature difference threshold value is equal to the difference between the charging pile outlet temperature at the end of charging under the corresponding ambient temperature and the corresponding charging power and the charging pile inlet temperature at the start of charging; The control unit is used to obtain the charging time and charging power of each charging; and judge the charging pile filter status according to the charging time, charging power, charging temperature data of the same charging and the charging pile filter status database.

2. The DC charging pile filter blockage detection device according to claim 1, characterized in that: The control unit is used to determine the status of the charging pile filter according to the charging time, charging power, charging temperature data and the charging pile filter status database during the same charging, specifically including: Determine whether the data of the corresponding charging is valid data according to the ambient temperature of the charging pile, the charging time and the charging power during each charging and the charging pile filter status database; if not, discard the data of the corresponding charging; If yes, determine the first temperature difference threshold from the charging pile filter status database according to the charging pile ambient temperature, charging duration and charging power during the corresponding charging; Calculating a first temperature difference according to the temperature of the charging pile air outlet and the temperature of the charging pile air inlet during the corresponding charging; Determine the state of the charging pile filter according to the first temperature difference and the first temperature difference threshold; Preferably, the control unit is used to determine whether the data at the corresponding charging time is valid data according to the charging pile ambient temperature, charging time and charging power at each charging time and the charging pile filter status database, specifically including: Determine whether there is data of the same working condition in the charging pile filter status database according to the charging pile ambient temperature and charging power during each charging and the ambient temperature and charging power in the charging pile filter status database; If there is data of the same working condition, it is determined whether the charging time of the corresponding charging is greater than or equal to the charging time of the data of the same working condition in the charging pile filter status database. If so, the data of the corresponding charging is valid data; otherwise, the data of the corresponding charging is invalid data; If there is no data for the same operating condition, the data for the corresponding charge is invalid.

3. The DC charging pile filter blockage detection device according to claim 1, characterized in that: The control unit is used to determine the status of the charging pile filter according to the charging time, charging power, charging temperature data and the charging pile filter status database during the same charging, specifically including: Select valid charging data from charging data within a period of time according to the ambient temperature, charging power and charging time corresponding to the temperature difference threshold in the charging pile filter status database; wherein the charging data includes charging temperature data, charging time and charging power during each charging; Calculate a second temperature difference according to the charging pile air outlet temperature and the charging pile air inlet temperature in the valid charging data; The status of the charging pile filter is determined based on the second temperature difference and the temperature difference threshold.

4. A method for detecting filter blockage of a DC charging pile, characterized in that: The detection method comprises: Constructing a charging pile filter status database; wherein the charging pile filter status database includes a temperature difference threshold value when the charging pile is charged for a certain period of time under different ambient temperatures and different charging powers, and the temperature difference threshold value is equal to the difference between the charging pile outlet temperature at the end of charging under the corresponding ambient temperature and the corresponding charging power and the charging pile inlet temperature at the start of charging; Obtain charging data for each charging; wherein the charging data includes charging time, charging power and charging temperature data; the charging temperature data includes the charging pile ambient temperature, the charging pile air inlet temperature at the start of charging and the charging pile air outlet temperature at the end of charging; The charging pile filter status is determined according to the charging data during the same charging and the charging pile filter status database.

5. The DC charging pile filter blockage detection method according to claim 4, characterized in that: The charging pile filter status is determined according to the charging data of the same charging and the charging pile filter status database, including: Determine whether the charging data of the corresponding charging is valid data according to the charging data of each charging and the charging pile filter status database; if not, discard the charging data of the corresponding charging; If yes, determine the first temperature difference threshold from the charging pile filter status database according to the charging pile ambient temperature, charging duration and charging power during the corresponding charging; Calculating a first temperature difference according to the temperature of the charging pile air outlet and the temperature of the charging pile air inlet during the corresponding charging; The state of the charging pile filter is determined according to the first temperature difference and the first temperature difference threshold.

6. The DC charging pile filter blockage detection method according to claim 5, characterized in that: According to the charging data of each charging and the charging pile filter status database, it is determined whether the charging data of the corresponding charging is valid data, specifically including: Determine whether there is data of the same working condition in the charging pile filter status database according to the charging pile ambient temperature and charging power during each charging and the ambient temperature and charging power in the charging pile filter status database; If there is data of the same working condition, it is determined whether the charging time of the corresponding charging is greater than or equal to the charging time of the data of the same working condition in the charging pile filter status database. If so, the charging data of the corresponding charging is valid data; otherwise, the charging data of the corresponding charging is invalid data; If there is no data for the same operating condition, the charging data for the corresponding charging is invalid data.

7. The DC charging pile filter blockage detection method according to claim 5 or 6, characterized in that: Determining the state of the charging pile filter according to the first temperature difference and the first temperature difference threshold specifically includes: When (1-r1%)ΔT T1 ≤ΔT1≤(1+r1%)ΔT T1 When the charging pile filter is in a healthy state; When ΔT T1 ×r2%≤|ΔT1-ΔT T1 |, the charging pile filter is slightly clogged and needs to be cleaned; When ΔT T1 ×r3%≤|ΔT1-ΔT T1 |, the charging pile filter is in a serious clogged state and needs to be replaced; Wherein, ΔT1 represents the first temperature difference; ΔT T1 represents the first temperature difference threshold; r1, r2, r3 represent percentage thresholds respectively, and r1<r2<r3.

8. The DC charging pile filter blockage detection method according to claim 4, characterized in that: The charging pile filter status is determined according to the charging data of the same charging and the charging pile filter status database, including: Select valid charging data from the charging data within a period of time according to the ambient temperature, charging power and charging time corresponding to the temperature difference threshold in the charging pile filter status database; Calculate a second temperature difference according to the charging pile air outlet temperature and the charging pile air inlet temperature in the valid charging data; The status of the charging pile filter is determined based on the second temperature difference and the temperature difference threshold.

9. The DC charging pile filter blockage detection method according to claim 8, characterized in that: The method of judging the state of the charging pile filter according to the second temperature difference and the temperature difference threshold specifically includes: When (1-r1%)ΔT T ≤ΔT2≤(1+r1%)ΔT T When the charging pile filter is in a healthy state; When ΔT T ×r2%≤|ΔT2-ΔT T |, the charging pile filter is slightly clogged and needs to be cleaned; When ΔT T ×r3%≤|ΔT2-ΔT T |, the charging pile filter is in a serious clogged state and needs to be replaced; Wherein, ΔT2 represents the second temperature difference; ΔT T represents the temperature difference threshold; r1, r2, and r3 represent percentage thresholds respectively, and r1<r2<r3.

10. A DC charging pile, characterized in that: The DC charging pile comprises the DC charging pile filter clogging detection device according to any one of claims 1 to 3.

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