A control method for a split DC charging pile

Abstract

The present invention discloses a control method for a split-type DC charging pile, which relates to the field of DC charging technology and solves the technical problem that an idle charging pile is not reasonably adjusted, which further increases the overall load and affects the overall working state. The present invention monitors the electric quantity during the battery charging process to judge the real-time charging process of the battery, and performs different analyses for different charging processes. The working state of the corresponding charging pile is judged according to the electric quantity in the constant current charging stage, and the reasons for the abnormality are analyzed. The specific reasons obtained through the analysis can facilitate the subsequent adjustment of the charging pile on the one hand, and can determine the monitoring of the battery charging process on the other hand, so as to ensure the safety of the overall charging. Finally, the charging pile is adjusted according to the specific reasons, which can improve the overall charging efficiency and reasonably plan the charging time.

Description

Technical Field

[0001] The present invention relates to the technical field of direct current charging, and in particular to a control method for a split type direct current charging pile. Background Art

[0002] New energy vehicles refer to vehicles that use unconventional vehicle fuels as their power source. At present, the country's new energy vehicles are developing rapidly, and charging piles, as the pioneers of the development of new energy vehicles, need to be vigorously standardized.

[0003] According to the patent application number CN201711032907.6, the patent system includes: a charging pile, a charging cabinet and two or more charging guns; wherein the charging pile is connected to the charging cabinet through a first first communication line, and is respectively connected to the two or more charging guns through corresponding first communication lines, so as to realize simultaneous charging of two or more vehicles to be charged through the two or more charging guns, and / or single-vehicle parallel charging of at least one vehicle to be charged; the charging cabinet is respectively connected to the two or more charging guns through a power line (17), so as to control the output power distribution of at least one of the two or more charging guns.

[0004] The above patent can overcome the defects of low charging pile utilization, single charging method, low charging efficiency and other defects in the prior art, and achieve the beneficial effects of high charging pile utilization, diverse charging methods and high charging efficiency. Overcoming the defects in the prior art and achieving beneficial effects. However, the above patent does not make reasonable adjustments for the excess charging time that occurs during the charging process of the battery. Further, the charging piles that are idle but in working state will increase the overall load, thereby affecting the work of other charging piles. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a control method for a split DC charging pile, which solves the problem that no reasonable adjustment is performed on idle charging piles, which further increases the overall load and affects the overall working state.

[0006] To achieve the above objectives, the present invention is implemented by the following technical solutions: a control method for a split DC charging pile, the method specifically comprising the following steps:

[0007] Step 1: Get the basic data of the charging pile and the battery, where the basic data of the charging pile includes: number, charging time and charging power, and the basic data of the battery includes: remaining power, charging number and charging status. Specifically, get all the charging piles in the area, label them and record them as i, i=1, 2, ..., j, then get the charging power corresponding to the charging pile as Gi and the charging time as Ti, and the charging number in the basic battery data is represented as the number corresponding to the charging pile. For example, if the battery is charged at the No. 5 charging pile, the corresponding battery number is 5. The charging status can be understood as the state of the battery charging process: constant current charging stage, constant voltage charging stage and trickle charging stage.

[0008] Step 2: Monitor the remaining battery power, obtain the changes in voltage and current, and obtain the battery charging status information. The specific method of obtaining the battery charging status information is as follows:

[0009] The remaining battery power is obtained and recorded as D. The corresponding voltage and current of the battery are obtained and recorded as U and I respectively. The changes of voltage and current within the time period t are obtained. Specifically, the voltage and current within the time period t are displayed in a graphical manner, and the difference in the change of voltage and current in adjacent unit times is calculated. The corresponding charging state is generated according to the change. The specific changes are: when the battery voltage is rising, it is represented as a constant current charging stage. When the battery voltage reaches the charging cut-off voltage, the corresponding current is reduced, which represents a constant voltage charging stage.

[0010] Step 3: Then analyze the battery charging status separately, and obtain analysis information by analyzing the changes in battery power and charging pile voltage. The specific analysis method is as follows:

[0011] The method of analyzing the charging pile corresponding to the constant current charging stage is:

[0012] S1: When the charging state is constant current charging, constant current charging can be understood as: the charger delivers energy to the battery at a constant current (usually in amperes) until the battery reaches a certain charging level. During the constant current charging stage, the battery voltage will gradually rise until it reaches the voltage limit set by the charger (also called the charging cut-off voltage), and the remaining battery power D is obtained, and the corresponding rated power is obtained as Dy, and then the two are substituted into the formula The charging time T1 corresponding to the constant current charging is calculated, and V1 represents the charging speed corresponding to the constant current charging, a is the loss factor, the specific value is set by the operator according to the actual situation, and Dy-D represents the required charging amount, and the charging time T1 is analyzed at the same time;

[0013] S2: Taking the current time as the starting point, obtain the time point corresponding to the time value T1 after the time starting point, and use it as the constant current cut-off point, then obtain the battery power corresponding to the constant current cut-off point and record it as D1, and the battery power D1 can be understood as the actual power corresponding to the battery when the time value T1 is reached and recorded as D1, and compare D1 with Dy. When D1=Dy, it means that the charging pile is normal, and a normal charging pile signal is generated, and the charging pile is continuously monitored. On the contrary, when D1≠Dy, it means that the charging pile is abnormal, and a charging pile abnormal signal is generated;

[0014] S3: The output current of the charging pile is obtained, and the output current can be understood as the current input from the charging pile to the battery during the time value T1 stage. At the same time, the charging pile corresponding to the rechargeable battery here then analyzes the output current. When the output current is a constant current, it indicates that the loss is too large. On the contrary, when the output current is not a constant current, it indicates that the output current is abnormal, and constant current charging information is generated at the same time.

[0015] The analysis method of the charging pile corresponding to the constant voltage charging stage is as follows:

[0016] A1: When the charging state is constant voltage charging, constant voltage charging can be understood as keeping the output voltage of the charger at a constant voltage value after the battery reaches the charging cut-off voltage. In the constant voltage charging stage, the battery current gradually decreases until it is close to zero. The battery change per unit time is obtained and recorded as Db. Then, the change of the battery change value Db per unit time is analyzed. When Db is a stable value, it means that the charging pile is normal, and a normal charging pile signal is generated. At the same time, the charging pile is continuously monitored. On the contrary, when Db is an unstable value, it means that the charging pile is abnormal, and a charging pile abnormal signal is generated. The stable value can be understood as the Db change difference per unit time is within an acceptable range. The specific acceptable range of values ​​is set by the operator. When the change difference exceeds the acceptable range, it is represented as an unstable value.

[0017] A2: The abnormal signal of the charging pile is obtained, and the real-time temperature of the battery is obtained as Ws, and compared with the normal temperature Wz. The normal temperature can be understood as the normal temperature range of the battery during the charging process, and the analysis here is based on the maximum value in the normal temperature range. When the real-time temperature Ws>Wz, it means that the battery temperature is abnormal, and the output current of the charging pile is too large and needs to be adjusted, and a current adjustment signal is generated. On the contrary, when the real-time temperature Ws≤Wz, it means that the battery temperature is normal and the output current abnormality signal is generated.

[0018] Step 4: Analyze the generated output current abnormal signal, and reasonably adjust the charging pile in combination with the working state of the charging pile to obtain adjustment information. The method of generating the adjustment information is as follows:

[0019] R1: Classify all charging piles i according to their working status, and the working status can be understood as the current charging status of the battery, and the battery charging status here corresponds to the battery charging process status in the previous text. The charging piles corresponding to the trickle charging stage are classified as charging piles to be analyzed, and the remaining ones are classified as working charging piles;

[0020] R2: Obtain all the charging piles to be analyzed and label them as n, where n=1, 2, ..., m. Then obtain the working charging piles with abnormal output current signals and record them as charging piles to be adjusted. Label them as o, where o=1, 2, ..., u. Combined with actual analysis, the charging piles to be adjusted here indicate that the charging time has not reached the initial preset time. When the charging time reaches the preset time, the system will automatically power off the piles.

[0021] R3: Then adjust the charging pile m to be analyzed and generate corresponding adjustment information, and the generation method is as follows:

[0022] The charging time Tm of the charging pile m to be analyzed is obtained, and its preset time is obtained and recorded as Tm1. The preset time can be understood as the charging time set by the charging personnel before charging begins. The charging piles to be analyzed corresponding to Tm<TM1 are screened out and marked as pre-shutdown charging piles, and the corresponding adjustment information is generated at the same time.

[0023] Finally, the obtained adjustment information is transmitted to the main control console, which receives the adjustment information and controls the charging pile to perform corresponding adjustment operations.

[0024] The present invention provides a control method for a split DC charging pile. Compared with the prior art, it has the following beneficial effects:

[0025] The present invention monitors the amount of electricity during the battery charging process to judge the real-time charging process of the battery, and performs different analyses for different charging processes. The working state of the corresponding charging pile is judged according to the amount of electricity in the constant current charging stage, and the causes of the abnormalities are analyzed. Similarly, the same analysis is performed for the constant voltage charging stage. The specific causes obtained through analysis can facilitate subsequent adjustment of the charging pile on the one hand, and can determine and monitor the battery charging process on the other hand, so as to ensure the safety of the overall charging. Finally, the charging pile is adjusted according to the specific causes, which can improve the overall charging efficiency and reasonably plan the charging time. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 The figure is a flow chart of the method of the present invention. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions 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.

[0028] See also Figure 1 The present application provides a control method for a split DC charging pile, which specifically includes the following steps:

[0029] Step 1: Get the basic data of the charging pile and the battery, where the basic data of the charging pile includes: number, charging time and charging power, and the basic data of the battery includes: remaining power, charging number and charging status. Specifically, get all the charging piles in the area, label them and record them as i, i=1, 2, ..., j, then get the charging power corresponding to the charging pile as Gi and the charging time as Ti, and the charging number in the basic battery data is represented as the number corresponding to the charging pile. For example, if the battery is charged at the No. 5 charging pile, the corresponding battery number is 5. The charging status can be understood as the state of the battery charging process: constant current charging stage, constant voltage charging stage and trickle charging stage.

[0030] Step 2: Monitor the remaining battery power, obtain the changes in voltage and current, and obtain the battery charging status information. The specific method of obtaining the battery charging status information is as follows:

[0031] The remaining battery power is obtained and recorded as D. The corresponding voltage and current of the battery are obtained and recorded as U and I respectively. The changes of voltage and current within the time period t are obtained. Specifically, the voltage and current within the time period t are displayed in a graphical manner, and the difference in the change of voltage and current in adjacent unit times is calculated. The corresponding charging state is generated according to the change. The specific changes are: when the battery voltage is rising, it is represented as a constant current charging stage. When the battery voltage reaches the charging cut-off voltage, the corresponding current is reduced, which represents a constant voltage charging stage.

[0032] Step 3: Then analyze the battery charging status separately, and obtain analysis information by analyzing the changes in battery power and charging pile voltage. The specific analysis method is as follows:

[0033] The method of analyzing the charging pile corresponding to the constant current charging stage is:

[0034] S1: When the charging state is constant current charging, constant current charging can be understood as: the charger delivers energy to the battery at a constant current (usually in amperes) until the battery reaches a certain charging level. During the constant current charging stage, the battery voltage will gradually rise until it reaches the voltage limit set by the charger (also called the charging cut-off voltage), and the remaining battery power D is obtained, and the corresponding rated power is obtained as Dy, and then the two are substituted into the formula The charging time T1 corresponding to the constant current charging is calculated, and V1 represents the charging speed corresponding to the constant current charging, a is the loss factor, the specific value is set by the operator according to the actual situation, and Dy-D represents the required charging amount, and the charging time T1 is analyzed at the same time;

[0035] S2: Taking the current time as the starting point, obtain the time point corresponding to the time value T1 after the time starting point, and use it as the constant current cut-off point, then obtain the battery power corresponding to the constant current cut-off point and record it as D1, and the battery power D1 can be understood as the actual power corresponding to the battery when the time value T1 is reached and recorded as D1, and compare D1 with Dy. When D1=Dy, it means that the charging pile is normal, and a normal charging pile signal is generated, and the charging pile is continuously monitored. On the contrary, when D1≠Dy, it means that the charging pile is abnormal, and a charging pile abnormal signal is generated;

[0036] S3: The output current of the charging pile is obtained, and the output current can be understood as the current input from the charging pile to the battery during the time value T1 stage. At the same time, the charging pile corresponding to the rechargeable battery here then analyzes the output current. When the output current is a constant current, it indicates that the loss is too large. On the contrary, when the output current is not a constant current, it indicates that the output current is abnormal, and constant current charging information is generated at the same time.

[0037] The analysis method of the charging pile corresponding to the constant voltage charging stage is as follows:

[0038] A1: When the charging state is constant voltage charging, constant voltage charging can be understood as keeping the output voltage of the charger at a constant voltage value after the battery reaches the charging cut-off voltage. In the constant voltage charging stage, the battery current gradually decreases until it is close to zero. The battery change per unit time is obtained and recorded as Db. Then, the change of the battery change value Db per unit time is analyzed. When Db is a stable value, it means that the charging pile is normal, and a normal charging pile signal is generated. At the same time, the charging pile is continuously monitored. On the contrary, when Db is an unstable value, it means that the charging pile is abnormal, and a charging pile abnormal signal is generated. The stable value can be understood as the Db change difference per unit time is within an acceptable range. The specific acceptable range of values ​​is set by the operator. When the change difference exceeds the acceptable range, it is represented as an unstable value.

[0039] A2: The abnormal signal of the charging pile is obtained, and the real-time temperature of the battery is obtained as Ws, and compared with the normal temperature Wz. The normal temperature can be understood as the normal temperature range of the battery during the charging process, and the analysis here is based on the maximum value in the normal temperature range. When the real-time temperature Ws>Wz, it means that the battery temperature is abnormal, and the output current of the charging pile is too large and needs to be adjusted, and a current adjustment signal is generated. On the contrary, when the real-time temperature Ws≤Wz, it means that the battery temperature is normal and the output current abnormality signal is generated.

[0040] Combined with actual analysis, the possible reasons for abnormal conditions in charging piles include: unstable power supply voltage, aging of internal components of the charging pile, poor connection of the charging pile lines and external interference, etc. In this application, the main reason for the unstable power supply voltage is analyzed. The reason for the unstable power supply voltage may be that when the grid load is large, the voltage may drop, and when the load is small, the voltage may increase. In this case, the output current of the charging pile will change accordingly, resulting in unstable charging.

[0041] Step 4: Analyze the generated output current abnormal signal, and reasonably adjust the charging pile in combination with the working state of the charging pile to obtain adjustment information. The method of generating the adjustment information is as follows:

[0042] R1: Classify all charging piles i according to their working status, and the working status can be understood as the current charging status of the battery, and the battery charging status here corresponds to the battery charging process status in the previous text. The charging piles corresponding to the trickle charging stage are classified as charging piles to be analyzed, and the remaining ones are classified as working charging piles;

[0043] R2: Obtain all the charging piles to be analyzed and label them as n, where n=1, 2, ..., m. Then obtain the working charging piles with abnormal output current signals and record them as charging piles to be adjusted. Label them as o, where o=1, 2, ..., u. Combined with actual analysis, the charging piles to be adjusted here indicate that the charging time has not reached the initial preset time. When the charging time reaches the preset time, the system will automatically power off the piles.

[0044] R3: Then adjust the charging pile m to be analyzed and generate corresponding adjustment information, and the generation method is as follows:

[0045] The charging time Tm of the charging pile m to be analyzed is obtained, and its preset time is obtained and recorded as Tm1. The preset time can be understood as the charging time set by the charging personnel before charging begins. The charging piles to be analyzed corresponding to Tm<TM1 are screened out and marked as pre-shutdown charging piles, and the corresponding adjustment information is generated at the same time.

[0046] Finally, the obtained adjustment information is transmitted to the main control console, which receives the adjustment information and controls the charging pile to perform corresponding adjustment operations.

[0047] Combined with actual analysis, in the actual charging process, the charging personnel will charge for a certain period of time according to the prompts of the system, but in most cases the preset time is longer than the standard charging time of the battery. Therefore, the charging pile of this type will be stopped for charging. For example, the current charging time is 2 hours, and the charging personnel chooses a charging time of 3 hours when choosing to charge. It can be fully charged in 2 hours, and the extra hour will be wasted. Therefore, it is chosen to be closed, and a closing message is generated, which is sent to the corresponding personnel via SMS or official account.

[0048] Some of the data in the above formulas are dimensionless and numerically calculated. Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0049] The above embodiments are only used to illustrate the technical method of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical method of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical method of the present invention.

Claims

1. A control method for a split DC charging pile, characterized in that: The following steps are involved: Step 1: Obtain basic information corresponding to the charging pile and battery; Step 2: Monitor the remaining battery power, obtain the changes in voltage and current, and obtain the battery charging status information; Step 3: Then analyze the battery charging status separately, and obtain analysis information by analyzing the change of battery power and charging pile voltage; Step 4: Obtain the analysis information, and adjust the charging pile in combination with the working status of the charging pile to obtain adjustment information; The analysis information in step 3 includes the battery constant current charging stage and the battery constant voltage charging stage, and the method of analyzing the battery constant current charging stage to obtain the analysis information is: S1: When the charging state is constant current charging, the remaining battery power D is obtained, and the corresponding rated power is obtained and recorded as Dy. Then substitute the two into the formula The charging time T1 corresponding to the constant current charging is calculated, and VI represents the charging speed corresponding to the constant current charging, a is the loss factor, the specific value is set by the operator according to the actual situation, and Dy-D represents the required charging amount, and the charging time T1 is analyzed at the same time; S2: Taking the current time as the starting point, obtain the time point corresponding to T1 after the time starting point, and use it as the constant current cut-off point, then obtain the battery power corresponding to the constant current cut-off point as D1, and compare D1 with Dy. When D1=Dy, it means that the charging pile is normal, and a normal charging pile signal is generated. At the same time, the charging pile is continuously monitored. On the contrary, when D1≠Dy, it means that the charging pile is abnormal, and a charging pile abnormal signal is generated. S3: Obtain the output current of the charging pile, and then analyze the output current. When the output current is a constant current, it means that the loss is too large. On the contrary, when the output current is not a constant current, it means that the output current is abnormal, and constant current charging information is generated at the same time; The specific method of obtaining the analysis information during the constant voltage charging phase of the battery is as follows: A1: When the charging state is constant voltage charging, the battery change per unit time is obtained and recorded as Db. Then the change of the battery change value per unit time Db is analyzed. When Db is a stable value, it means that the charging pile is normal, and a normal charging pile signal is generated. At the same time, the charging pile is continuously monitored. On the contrary, when Db is an unstable value, it means that the charging pile is abnormal, and a charging pile abnormal signal is generated. A2: The abnormal signal of the charging pile is obtained, and the real-time temperature of the battery is obtained as Ws, and compared with the normal temperature Wz. When the real-time temperature Ws>Wz, it means that the battery temperature is abnormal. At the same time, the output current of the charging pile is too large and needs to be adjusted, and a current adjustment signal is generated. On the contrary, when the real-time temperature Ws≤Wz, it means that the battery temperature is normal and the output current is abnormal.

2. The control method of a split type DC charging pile according to claim 1, characterized in that: The basic information of the charging pile in step 1 includes: charging pile number, charging time, voltage and current, the basic data of the battery includes: remaining power, charging number, charging status and preset time, and the battery charging status includes: constant current charging stage, constant voltage charging stage and trickle charging stage.

3. The control method of a split type DC charging pile according to claim 1, characterized in that: The method of obtaining the battery charging status information in step 2 is: The remaining battery power is obtained and recorded as D. The corresponding voltage and current of the battery are obtained and recorded as U and I respectively. The changes of voltage and current within the time period t are obtained, and the corresponding charging state is generated according to the changes. The specific changes are: when the battery voltage rises, it indicates the constant current charging stage. When the battery voltage reaches the charging cut-off voltage, the corresponding current decreases, which indicates the constant voltage charging stage.

4. The control method of a split type DC charging pile according to claim 1, characterized in that: The specific method of analyzing the analysis information according to the working state of the charging pile in step 4 to obtain the adjustment information is: R1: Classify all charging piles i according to their working status, classify the charging piles corresponding to the trickle charging stage as charging piles to be analyzed, and the remaining ones are classified as working charging piles; R2: Obtain all the charging piles to be analyzed and label them as n, where n=1, 2, ..., m. Then obtain the working charging piles with abnormal output current signals and record them as charging piles to be adjusted. At the same time, label them as o, where o=1, 2, ..., u. R3: Then adjust the charging pile m to be analyzed and generate corresponding adjustment information, and the generation method is as follows: The charging time Tm of the charging pile m to be analyzed is obtained, and its preset time is obtained and recorded as Tm1, and the charging piles to be analyzed corresponding to Tm<TM1 are screened out and marked as pre-shutdown charging piles, and corresponding adjustment information is generated at the same time.

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