A charging pile control system and method

Abstract

This invention provides a charging pile control system and method. The system includes: a controller, a sensor module, an AC-DC module, an energy meter, a contactor, and an IC card identification module connected to the controller; a 380V AC power supply provides initial power to the AC-DC module via the contactor and energy meter; the AC-DC module outputs DC voltage to charge the battery of the electric vehicle; the sensor module measures the charging voltage, charging current, and charging gun temperature; the energy meter measures the charging amount data required for pricing; the controller outputs a pulse signal with an adjustable duty cycle to the AC-DC module based on the real-time obtained charging voltage, charging current, charging gun temperature, and the real-time battery voltage and temperature obtained from the BMS unit on the electric vehicle, to rapidly charge the battery. This invention achieves safe and rapid charging of electric vehicle batteries by controlling charging based on real-time obtained charging parameters and battery parameters.

Description

Technical Field

[0001] This invention belongs to the field of charging pile control technology, specifically relating to a charging pile control system and method. Background Technology

[0002] Electric vehicles, as a promising green transportation tool, have a huge future market potential. Developing electric vehicles has been widely recognized by major producing countries worldwide as a crucial way to enhance the competitiveness of the automotive industry, ensure energy security, and transition to a low-carbon economy. Therefore, the Chinese government has also vigorously promoted and supported new energy vehicles, actively advancing their application and development. As an indispensable supporting infrastructure for the development of electric vehicles, charging stations have significant social and economic benefits.

[0003] Charging stations act as a bridge between the power supply and the vehicle's battery, transferring energy from the power supply to the electric vehicle's battery according to a specific charging mode. There are two charging methods: AC charging and DC charging. AC charging, also known as "slow charging," uses the charging station to charge the vehicle's onboard charger. It doesn't provide any electrical output itself, but rather acts as a charging control switch. DC charging, also known as "fast charging," uses a non-onboard charger to directly charge the electric vehicle's battery pack. Its input is a three-phase four-wire 380V AC power, and its output is adjustable DC power. The charging process of a DC charging station must comply with the national standard GB / T 27930, "Communication Protocol between Non-Onboard Conductive Chargers and Battery Management Systems for Electric Vehicles." Onboard chargers generally have lower power output, while DC charging stations can output higher voltage and current, resulting in significantly higher output power. Therefore, DC charging stations can quickly charge electric vehicle battery packs.

[0004] Existing DC charging stations suffer from problems such as low charging efficiency and insufficient charging speed when charging electric vehicle battery packs. Summary of the Invention

[0005] To address the aforementioned problems in the prior art, this invention provides a charging pile control system and method.

[0006] To achieve the above objectives, the present invention adopts the following technical solution.

[0007] In a first aspect, the present invention provides a charging pile control system, comprising: a controller, a sensor module, an AC-DC module, an energy meter, a contactor, and an IC card identification module connected to the controller; a 380V AC power supply provides initial power to the AC-DC module via the contactor and the energy meter; the AC-DC module is used to output DC voltage to charge the battery on the electric vehicle; the sensor module is used to measure the charging voltage, charging current, and charging gun temperature; the energy meter is used to measure the charging amount data required for pricing; the IC card identification module is used for identity recognition, and after successful recognition, the controller outputs a control signal to connect the contactor; the controller is used to output a pulse signal with an adjustable duty cycle to the AC-DC module based on the real-time obtained charging voltage, charging current, charging gun temperature, and the real-time battery voltage and battery temperature obtained from the BMS unit on the electric vehicle, to quickly charge the battery.

[0008] Furthermore, the method for rapidly charging the battery includes:

[0009] At the start of charging, the controller outputs a pulse signal with a gradually increasing duty cycle to the AC-DC module. The charging module then performs trickle charging on the battery until the battery voltage reaches k1*E, where E is the fully charged voltage of the battery. <k1<1;

[0010] The controller outputs a pulse signal with a gradually increasing duty cycle to the AC-DC module. Based on the charging current obtained from the sensor module, the duty cycle is adjusted in real time to achieve constant current charging of the battery until the battery voltage reaches k2*E, k1 <k2<1;

[0011] The controller adjusts the duty cycle in real time based on the charging voltage output by the sensor module to achieve constant voltage charging of the battery until the battery voltage reaches E.

[0012] Furthermore, the method for fast charging the battery also includes:

[0013] The charging gun temperature and battery temperature are acquired in real time. If the charging gun temperature and / or battery temperature exceed the set threshold, charging is stopped.

[0014] Furthermore, the method for rapidly charging the battery includes:

[0015] S1. First, trickle charge the battery for a period of time, then switch to S2 for constant current charging;

[0016] S2. Real-time acquisition of charging current, charging gun temperature, battery voltage, and battery temperature with a period of T;

[0017] S3. Before the end of the current cycle, determine whether the charging current needs to be increased or decreased based on the set charging gun temperature threshold and battery temperature threshold.

[0018] S4. If necessary, increase or decrease the charging current by one step at the beginning of the next cycle; if not, keep the charging current of the current cycle unchanged in the next cycle.

[0019] S5. If the battery voltage is less than the full charge voltage E, proceed to S2; otherwise, charging ends.

[0020] Furthermore, the initial charging current when switching from trickle charging to constant current charging is k*I. M I M The maximum allowable charging current is given by k, where k is the safety factor and 0 is the maximum allowable charging current. <k<1。

[0021] Furthermore, methods for determining whether to increase or decrease the charging current include:

[0022] The formula for predicting the time required for full charging from the current moment is as follows:

[0023]

[0024]

[0025] In the formula, t is the time required for charging to be completed from the current moment, and V is the value of V. n For the current cycle charging speed, E n E n-1 These are the battery voltages for the current cycle and the cycle preceding the current cycle, respectively.

[0026] The formula for predicting the charging gun temperature when charging is complete is as follows:

[0027] T 1-end =T 1-n +tV 1-n

[0028]

[0029] In the formula, T 1-end V represents the temperature of the charging gun when charging is complete. 1-n V represents the rate of temperature rise of the charging gun during the current cycle. 1-n V 1-(n-1) These are the charging gun temperatures for the current cycle and the previous cycle, respectively.

[0030] The formula for predicting the battery temperature when charging is complete is as follows:

[0031] T 2-end =T 2-n +tV 2-n

[0032]

[0033] In the formula, T 2-endV represents the battery temperature when charging is complete. 2-n V represents the rate of temperature rise of the battery in the current cycle. 2-n V 2-(n-1) These are the battery temperatures for the current cycle and the cycle preceding the current cycle, respectively.

[0034] If T 1-end / T 1-0 >1 or T 2-end / T 2-0 If T > 1, the charging current in the next cycle will decrease by one step, where T 1-0 T 2-0 These are the charging gun temperature threshold and the battery temperature threshold, respectively.

[0035] If 0.8 <T 1-end / T 1-0 ≤1 and T 2-end / T 2-0 ≤1, or T 1-end / T 1-0 ≤1 and 0.8 <T 2-end / T 2-0 If the value is ≤1, the charging current in the next cycle remains unchanged;

[0036] If T 1-end / T 1-0 ≤0.8 and T 2-end / T 2-0 If the value is ≤0.8, the charging current in the next cycle will increase by one step.

[0037] Furthermore, if the charging current in the next cycle increases by one step and exceeds k*I M Then the charging current for the next cycle is set to k*I. M .

[0038] Furthermore, the system also includes an alarm module connected to the controller, which issues an alarm signal when the charging gun temperature and / or battery temperature exceeds a set threshold.

[0039] Furthermore, the system also includes a human-machine interaction module connected to the controller.

[0040] Secondly, the present invention provides a method for charging control using the system, comprising the following steps performed in a controller:

[0041] The user's identity is identified through the IC card identification module;

[0042] After successful identification, a control signal is output to connect the contactor to 380V AC power.

[0043] It can obtain charging voltage, charging current, and charging gun temperature in real time, as well as battery voltage and battery temperature from the BMS unit on the electric vehicle, and output pulse signals with adjustable duty cycle to the AC-DC module to quickly charge the battery.

[0044] After charging is completed, charging pricing is calculated based on the output data of the electricity meter.

[0045] Compared with the prior art, the present invention has the following beneficial effects.

[0046] This invention utilizes a controller, sensor module, AC-DC module, energy meter, contactor, and IC card identification module. The sensor module measures charging voltage, charging current, and charging gun temperature. The IC card identification module is used for identification. Upon successful identification, the controller outputs a control signal to activate the contactor. Based on real-time data of the charging voltage, charging current, charging gun temperature, and battery voltage and temperature obtained from the BMS unit on the electric vehicle, the controller outputs a pulse signal with an adjustable duty cycle to the AC-DC module for rapid battery charging. This invention achieves safe and rapid charging of electric vehicle batteries through charging control based on real-time charging and battery parameters. Attached Figure Description

[0047] Figure 1 This is a block diagram of a charging pile control system according to an embodiment of the present invention. In the figure, 1-controller, 2-sensor module, 3-AC-DC module, 4-energy meter, 5-contactor, 6-IC card identification module, 7-BMS unit, and 8-battery.

[0048] Figure 2 This is a flowchart illustrating a method for charging control using the system according to an embodiment of the present invention. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of this invention clearer and more understandable, the invention will be further described below in conjunction with the accompanying drawings and specific embodiments. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0050] Figure 1This is a block diagram of a charging pile control system according to an embodiment of the present invention, including: a controller 1, a sensor module 2, an AC-DC module 3, an energy meter 4, a contactor 5, and an IC card identification module 6 connected to the controller 1; a 380V AC power supply provides initial power to the AC-DC module 3 via the contactor 5 and the energy meter 4; the AC-DC module 3 is used to output DC voltage to charge the battery 8 on the electric vehicle; the sensor module 2 is used to measure the charging voltage, charging current, and charging gun temperature; the energy meter 4 is used to measure the charging amount data required for pricing; the IC card identification module 6 is used for identity recognition, and after successful recognition, the controller 1 outputs a control signal to connect the contactor 5; the controller 1 outputs a pulse signal with an adjustable duty cycle to the AC-DC module 3 to quickly charge the battery 8 based on the real-time obtained charging voltage, charging current, charging gun temperature, and the real-time battery voltage and battery temperature obtained from the BMS unit 7 on the electric vehicle.

[0051] In this embodiment, the system mainly consists of a controller 1, a sensor module 2, an AC-DC module 3, an energy meter 4, a contactor 5, and an IC card identification module 6. The functions of each module are described below.

[0052] AC-DC module 3 is primarily used to output DC voltage to charge battery 8. It mainly consists of a rectifier circuit, a high-frequency oscillation circuit, and a step-down rectifier circuit. The 380V AC power, after rectification, outputs a DC voltage to power the high-frequency oscillation circuit. The high-frequency oscillation circuit then outputs a high-frequency voltage signal, which, after step-down rectification, outputs the DC voltage to charge battery 8. Because the oscillation circuit operates at a high frequency, the transformer can be easily miniaturized. The oscillation circuit uses a high-power switching transistor, whose control gate is connected to controller 1. Controller 1 outputs a pulse signal (PWM) with an adjustable duty cycle to the control gate, allowing for convenient adjustment of the output voltage and current of AC-DC module 3.

[0053] Sensor module 2 is mainly used to measure charging voltage, charging current, and charging gun temperature. Sensor module 2 is installed inside the charging gun and mainly consists of a temperature sensor, voltage and current sampling circuits, etc.

[0054] Electricity meter 4 is mainly used to measure the power consumption during the charging process, providing a basis for charging pricing. Electricity meter 4 is installed between contactor 5 and AC-DC module 3. Electricity meter 4 can be a smart meter, or a dedicated power chip can be used instead of electricity meter 4.

[0055] Contactor 5 is used to control the switching on and off of 380V AC power. The control terminal of contactor 5 is connected to controller 1. When charging begins, controller 1 outputs a control signal to connect contactor 5 to the 380V AC power; after charging is complete, controller 1 outputs a control signal to disconnect contactor 5 from the 380V AC power. Of course, since the pull-in current required to connect contactor 5 is relatively large, the output of controller 1 is generally connected to the control terminal of contactor 5 through a first-stage drive circuit.

[0056] The IC card identification module 6 is used for identity verification. Users need to swipe their cards to authenticate their identity before charging. Alternatively, WeChat QR code scanning can also be used.

[0057] Controller 1 is the control and data processing center of the system. It primarily coordinates the operation of various modules by outputting various control signals and completes necessary data processing tasks. For example, it outputs a pulse signal (PWM) with an adjustable duty cycle to the AC-DC module 3 to adjust the charging voltage and current; it also outputs control signals to the contactor 5 to connect or disconnect the 380V AC power. Controller 1 is also connected to the BMS unit 7 on the electric vehicle for information exchange. For instance, it receives charging request signals from the BMS unit 7, sends charging permission signals to the BMS unit 7, and receives battery parameters (battery voltage, battery temperature) from the BMS unit 7. The data processing tasks that controller 1 needs to complete mainly involve outputting a pulse signal (PWM) with an adjustable duty cycle to the AC-DC module 3 according to a pre-set charging strategy, based on the acquired charging voltage, current, charging gun temperature, and battery voltage and temperature parameters, to achieve fast and safe charging of the battery 8. Safe charging mainly refers to the safety of the charging equipment (charging gun) and the charged device (battery 8), such as ensuring that equipment temperature and charging current do not exceed safety thresholds.

[0058] As an optional embodiment, the method for fast charging the battery 8 includes:

[0059] At the start of charging, controller 1 outputs a pulse signal with a duty cycle gradually increasing from 0 to AC-DC module 3. The charging module then performs trickle charging on battery 8 until the battery voltage reaches k1*E, where E is the fully charged voltage of battery 8. <k1<1;

[0060] Controller 1 outputs a pulse signal with a gradually increasing duty cycle to AC-DC module 3. Based on the charging current obtained from sensor module 2, the duty cycle is adjusted in real time to achieve constant current charging of battery 8 until the battery voltage is k2*E, k1 <k2<1;

[0061] The controller 1 adjusts the duty cycle in real time based on the charging voltage output by the sensor module 2 to achieve constant voltage charging of the battery 8 until the battery voltage is E.

[0062] This embodiment provides a technical solution for quickly charging the battery 8. The charging process of this embodiment includes three stages, which are trickle charging, constant current charging, and constant voltage charging in chronological order. The first charging stage is trickle charging. At the beginning of charging, trickle charging is adopted. The AC-DC module 3 activates the battery 8 by outputting a tiny current, and its output voltage slowly increases from 0 until the battery voltage rises to k1*E, where E is the full voltage of the battery 8 and 0 < k1 < 1. The second charging stage is constant current charging, that is, the charging current remains unchanged and the battery voltage gradually increases. When the battery voltage rises to k2*E, the constant current charging ends. The third charging stage is constant voltage charging, that is, the output voltage of the AC-DC module 3 remains unchanged until the battery 8 is fully charged. The quick charging of this embodiment is mainly achieved in the constant current charging stage. As long as the constant current charging current is large enough, the purpose of quick charging can be achieved.

[0063] As an optional embodiment, the method for quickly charging the battery 8 further includes:

[0064] Obtain the charging gun temperature and the battery temperature in real time. If the charging gun temperature and / or the battery temperature exceeds the set threshold, stop charging.

[0065] This embodiment provides a technical solution for ensuring charging safety. In the three charging stages of the previous embodiment, the temperatures of the charging device and the charged device are not monitored. Once the temperature is too high, if charging continues, it may cause damage to the charging device and the charged device. Therefore, in the charging process of this embodiment, the charging gun temperature and the battery temperature are obtained in real time and compared with the set thresholds respectively. If any one of them exceeds the set threshold, immediately stop charging to prevent the charging gun temperature and / or the battery temperature from rising further.

[0066] As an optional embodiment, the method for quickly charging the battery 8 includes:

[0067] S1. First, perform trickle charging on the battery 8 for a period of time, and then turn to S2 for constant current charging;

[0068] S2. Obtain the charging current, the charging gun temperature, the battery voltage, and the battery temperature in real time with a period of T;

[0069] S3. Before the end of the current period, judge whether it is necessary to increase or decrease the charging current based on the set charging gun temperature threshold and battery temperature threshold;

[0070] S4. If necessary, increase or decrease the charging current by one step at the beginning of the next period; if not, keep the charging current of the current period unchanged in the next period;

[0071] S5. If the battery voltage is less than the full voltage E, turn to S2; otherwise, the charging ends.

[0072] This embodiment provides another technical solution for fast charging battery 8. In this fast charging scheme, trickle charging is used at the beginning of charging (see step S1). After trickle charging for a period of time, the process proceeds to step S2 for constant current charging. To achieve fast charging, a higher constant current charging current is better; however, to ensure safe charging, it is necessary to monitor the charging current, charging gun temperature, battery voltage, and battery temperature. In step S3, before the end of the current cycle, it is determined whether to increase or decrease the charging current based on the set charging gun temperature threshold and battery temperature threshold. The principle is to maximize the charging current (fastest charging speed) while ensuring that the charging gun temperature and battery temperature do not exceed the set thresholds. Step S4 adjusts the charging current based on the judgment result of step S3. Step S5 determines whether the battery is fully charged. If not, the process returns to step S2, and S2 to S4 are repeated until the battery is fully charged. This charging scheme can achieve the fastest battery charging speed while ensuring the safety of the charging gun and battery.

[0073] As an optional embodiment, the initial charging current when switching from trickle charging to constant current charging is k*I. M I M The maximum allowable charging current is given by k, where k is the safety factor and 0 is the maximum allowable charging current. <k<1。

[0074] This embodiment is an improvement on the previous embodiment. This embodiment limits the initial charging current when switching from trickle charging to constant current charging. Since the temperature of the charging gun and battery 8 is low at the beginning of constant current charging, overheating can be disregarded initially, and only the charging speed needs to be considered. To maximize the charging speed, the charging current can be set to its maximum, i.e., not exceeding the battery's maximum allowable current I. M (Obtained from BMS unit 7). To ensure battery safety, this embodiment sets the initial charging current to k*I. M k is a value very close to 1, such as 0.9.

[0075] As an optional embodiment, the method for determining whether the charging current needs to be increased or decreased includes:

[0076] The formula for predicting the time required for full charging from the current moment is as follows:

[0077]

[0078]

[0079] In the formula, t is the time required for charging to be completed from the current moment, and V is the value of V. n For the current cycle charging speed, E n E n-1These are the battery voltages for the current cycle and the cycle preceding the current cycle, respectively.

[0080] The formula for predicting the charging gun temperature when charging is complete is as follows:

[0081] T 1-end =T 1-n +tV 1-n

[0082]

[0083] In the formula, T 1-end V represents the temperature of the charging gun when charging is complete. 1-n V represents the rate of temperature rise of the charging gun during the current cycle. 1-n V 1-(n-1) These are the charging gun temperatures for the current cycle and the previous cycle, respectively.

[0084] The formula for predicting the battery temperature when charging is complete is as follows:

[0085] T 2-end =T 2-n +tV 2-n

[0086]

[0087] In the formula, T 2-end V represents the battery temperature when charging is complete. 2-n V represents the rate of temperature rise of the battery in the current cycle. 2-n V 2-(n-1) These are the battery temperatures for the current cycle and the cycle preceding the current cycle, respectively.

[0088] If T 1-end / T 1-0 >1 or T 2-end / T 2-0 If T > 1, the charging current in the next cycle will decrease by one step, where T 1-0 T 2-0 These are the charging gun temperature threshold and the battery temperature threshold, respectively.

[0089] If 0.8 <T 1-end / T 1-0 ≤1 and T 2-end / T 2-0 ≤1, or T 1-end / T 1-0 ≤1 and 0.8 <T 2-end / T 2-0 If the value is ≤1, the charging current in the next cycle remains unchanged;

[0090] If T 1-end / T 1-0 ≤0.8 and T2-end / T 2-0 If the value is ≤0.8, the charging current in the next cycle will increase by one step.

[0091] This embodiment provides a technical solution for determining whether to increase or decrease the charging current. The technical principle of this embodiment is as follows: since the longer the constant current charging time, the higher the temperature rise of the battery and charging gun, the method for correcting the charging current for the next cycle is determined by examining the relative magnitudes of the battery temperature and charging gun temperature at the end of charging and a set threshold: remain unchanged, increase by one step, or decrease by one step. Existing technologies generally determine the charging current correction method based on the current device temperature. Since the change in temperature with current has a certain lag, judging based on the current device temperature may fail to guarantee device safety (temperature exceeding the threshold) due to the sluggish temperature change. Therefore, this embodiment judges based on the moment when the device temperature is highest during the charging process, thereby determining the charging current correction method, which can prevent problems before they occur and has high reliability. Of course, the processing scheme of this embodiment needs to predict the device temperature at the end of charging. Since the prediction is only used to ensure device safety, high prediction accuracy is not required. For example, when making the prediction, the battery charging speed, the charging gun temperature rise rate, and the battery temperature rise rate after the current cycle can all be considered to remain unchanged in the current cycle. After obtaining the predicted battery temperature and the predicted charging gun temperature at the end of charging, they are compared with the set temperature thresholds respectively. Based on their relative magnitudes, it is determined whether the charging current for the next cycle should increase by one step, decrease by one step, or remain unchanged.

[0092] As an optional embodiment, if the charging current in the next cycle increases by one step and exceeds k*I M Then the charging current for the next cycle is set to k*I. M .

[0093] This embodiment limits the increase in charging current for the next cycle. In the previous embodiment, there were three methods for correcting the charging current in the next cycle: increasing by a step size, decreasing by a step size, and keeping it unchanged. According to the charging current setting scheme of the previous embodiment, to obtain the fastest charging speed, the charging current is always set close to the maximum allowable charging current. The latter two methods do not pose a safety hazard, but the first method, by increasing the charging current by a step size, may exceed the maximum allowable charging current I. M Therefore, in this embodiment, the value of the charging current increased by one step is compared with k*I. M Comparison, if it exceeds k*I M Set the charging current for the next cycle to k*I M .

[0094] As an optional embodiment, the system further includes an alarm module connected to the controller 1, which issues an alarm signal when the charging gun temperature and / or battery temperature exceeds a set threshold.

[0095] In this embodiment, the system is also equipped with an alarm module connected to the controller 1. Figure 1 (Not shown) This alarm module is used to issue an alarm signal when the temperature of the charging gun and / or the battery exceeds a set threshold, prompting staff to take appropriate measures. The alarm module can use audible alarms, such as buzzers or voice chips, or it can be an audible and visual alarm.

[0096] As an optional embodiment, the system further includes a human-machine interaction module connected to the controller 1.

[0097] In this embodiment, the system also includes a human-computer interaction module connected to the controller 1. Figure 1 (Not shown). The human-computer interaction module mainly consists of a display screen, keyboard or mouse, which facilitates information display and manual intervention.

[0098] Figure 2 This is a flowchart illustrating a method for charging control using the system according to an embodiment of the present invention. The method includes the following steps:

[0099] Step 101: The user's identity is identified through the IC card identification module 6;

[0100] Step 102: After successful identity recognition, output a control signal to connect contactor 5 to 380V AC power.

[0101] Step 103: Real-time acquisition of charging voltage, charging current, charging gun temperature, and real-time acquisition of battery voltage and battery temperature from BMS unit 7 on the electric vehicle, outputting a pulse signal with adjustable duty cycle to AC-DC module 3 for fast charging of the battery.

[0102] Step 104: After charging is completed, charging pricing is calculated based on the output data of electricity meter 4.

[0103] The method in this embodiment is similar to... Figure 1 The implementation principle and technical effect of the system embodiment shown are similar to those of the system, and will not be repeated here.

[0104] 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 charging pile control system, characterized in that, include: The controller, connected to the controller are sensor modules, AC-DC modules, energy meters, contactors, and IC card identification modules; 380V AC power provides initial power to the AC-DC modules via contactors and energy meters; the AC-DC modules are used to output DC voltage to charge the batteries in electric vehicles; the sensor modules are used to measure charging voltage, charging current, and charging gun temperature; the energy meters are used to measure the charging amount data required for pricing. The IC card identification module is used for identity recognition. After successful recognition, the controller outputs a control signal to connect the contactor. The controller outputs a pulse signal with an adjustable duty cycle to the AC-DC module to quickly charge the battery based on the real-time obtained charging voltage, charging current, charging gun temperature, and battery voltage and temperature obtained from the BMS unit on the electric vehicle. The method for fast charging the battery includes: At the start of charging, the controller outputs a pulse signal with a gradually increasing duty cycle to the AC-DC module. The charging module then performs trickle charging on the battery until the battery voltage reaches k1*E, where E is the fully charged voltage of the battery. <k1<1; The controller outputs a pulse signal with a gradually increasing duty cycle to the AC-DC module. Based on the charging current obtained from the sensor module, the duty cycle is adjusted in real time to achieve constant current charging of the battery until the battery voltage reaches k2*E, k1 <k2<1; The controller adjusts the duty cycle in real time based on the charging voltage output by the sensor module to achieve constant voltage charging of the battery until the battery voltage is E; The method for fast charging the battery includes: S1. First, trickle charge the battery for a period of time, then switch to S2 for constant current charging; S2. Real-time acquisition of charging current, charging gun temperature, battery voltage, and battery temperature with a period of T; S3. Before the end of the current cycle, determine whether the charging current needs to be increased or decreased based on the set charging gun temperature threshold and battery temperature threshold. S4. If necessary, increase or decrease the charging current by one step at the beginning of the next cycle; if not, keep the charging current of the current cycle unchanged in the next cycle. S5. If the battery voltage is less than the full charge voltage E, proceed to S2; otherwise, charging is complete. The initial charging current when switching from trickle charging to constant current charging is k*I M I M The maximum allowable charging current is given by k, where k is the safety factor and 0 is the maximum allowable charging current. <k<1; Methods for determining whether the charging current needs to be increased or decreased include: The formula for predicting the time required for full charging from the current moment is as follows: In the formula, t is the time required for charging to be completed from the current moment, and V is the value of V. n For the current cycle charging speed, E n E n-1 These are the battery voltages for the current cycle and the cycle preceding the current cycle, respectively. The formula for predicting the charging gun temperature when charging is complete is as follows: T 1-end =T 1-n +tV 1-n In the formula, T 1-end V represents the temperature of the charging gun when charging is complete. 1-n V represents the rate of temperature rise of the charging gun during the current cycle. 1-n V 1-(n-1) These are the charging gun temperatures for the current cycle and the previous cycle, respectively. The formula for predicting the battery temperature when charging is complete is as follows: T 2-end =T 2-n +tV 2-n In the formula, T 2-end V represents the battery temperature when charging is complete. 2-n V represents the rate of temperature rise of the battery in the current cycle. 2-n V 2-(n-1) These are the battery temperatures for the current cycle and the cycle preceding the current cycle, respectively. If T 1-end / T 1-0 >1 or T 2-end / T 2-0 If T > 1, the charging current in the next cycle will decrease by one step, where T 1-0 T 2-0 These are the charging gun temperature threshold and the battery temperature threshold, respectively. If 0.8 <T 1-end / T 1-0 ≤1 and T 2-end / T 2-0 ≤1, or T 1-end / T 1-0 ≤1 and 0.8 <T 2-end / T 2-0 If the value is ≤1, the charging current in the next cycle remains unchanged; If T 1-end / T 1-0 ≤0.8 and T 2-end / T 2-0 If the value is ≤0.8, the charging current in the next cycle will increase by one step.

2. The charging pile control system according to claim 1, characterized in that, The method for fast charging the battery further includes: The charging gun temperature and battery temperature are acquired in real time. If the charging gun temperature and / or battery temperature exceed the set threshold, charging is stopped.

3. The charging pile control system according to claim 2, characterized in that, If the charging current in the next cycle increases by one step and exceeds k*I M Then the charging current for the next cycle is set to k*I. M .

4. The charging pile control system according to claim 1, characterized in that, The system also includes an alarm module connected to the controller, which issues an alarm signal when the charging gun temperature and / or battery temperature exceeds a set threshold.

5. The charging pile control system according to claim 1, characterized in that, The system also includes a human-computer interaction module connected to the controller.

6. A method for charging control using the system described in claim 1, characterized in that, Includes the following steps performed in the controller: The user's identity is identified through the IC card identification module; After successful identification, a control signal is output to connect the contactor to 380V AC power. It can obtain charging voltage, charging current, and charging gun temperature in real time, as well as battery voltage and battery temperature from the BMS unit on the electric vehicle, and output pulse signals with adjustable duty cycle to the AC-DC module to quickly charge the battery. After charging is completed, charging pricing is calculated based on the output data of the electricity meter.

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