Intelligent overcurrent protection method and charging pile

Abstract

The application discloses a kind of intelligent overcurrent protection method and charging pile, when detecting that charging gun is connected with electric vehicle, obtain the charging information of electric vehicle including demand upper limit current and demand current;According to the demand upper limit current and the maximum current upper limit of charging pile, the overcurrent protection threshold of intelligent circuit breaker is set, and the starting process of charging pile charging is entered;Combined with the intelligent circuit breaker, based on the demand current and the overcurrent protection threshold, the overcurrent protection of the charging of electric vehicle is carried out;The internal of charging pile is additionally provided with intelligent circuit breaker, and according to the charging specification of electric vehicle, the overcurrent protection threshold of intelligent circuit breaker is set, and the demand current of electric vehicle is combined, to realize the overcurrent protection of the charging process of different specifications electric vehicle, greatly avoid overcurrent caused by short-circuit fault of charging pile, so as to cause the replacement and maintenance of electric vehicle charging loop device.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of overcurrent protection, in particular to a method for intelligent overcurrent protection and a charging pile. BACKGROUND

[0002] With the development of electric vehicles, vehicle product models are various, and their charging demand currents and voltages are also different. Different models of electric vehicles select protection devices (fuses) according to the size of the battery capacity in the electric vehicle or the size of the charging loop demand current. However, the selection on the main loop of the charging pile is based on the principle of compatibility with large currents, and cannot take into account the matching with the electric vehicle fuses. There are differences between the two in overcurrent or short circuit protection time. The smaller the current of the device specification, the faster the time of fusing, which will cause the main loop protection device of the small current charging electric vehicle to be protected first, and the device will be damaged.

[0003] Therefore, how to protect the fuses and other devices on the charging loop of the electric vehicle from being damaged due to overcurrent or short circuit caused by the failure of the charging pile and reduce the replacement of the devices has become an urgent problem to be solved. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a method for intelligent overcurrent protection and a charging pile, which can protect the protection devices on the electric vehicle and reduce the damage and replacement of the protection devices on the charging loop of the electric vehicle.

[0005] In order to solve the above technical problems, the technical scheme adopted by the present application is as follows:

[0006] A method for intelligent overcurrent protection, comprising the steps of:

[0007] S1, when it is detected that a charging gun is connected with an electric vehicle, obtaining charging information of the electric vehicle including a demand upper limit current and a demand current;

[0008] S2, setting an overcurrent protection threshold for an intelligent circuit breaker according to the demand upper limit current and a maximum current upper limit of the charging pile, and entering a starting process of charging of the charging pile;

[0009] S3, combining the intelligent circuit breaker, and based on the demand current and the overcurrent protection threshold, performing overcurrent protection on charging of the electric vehicle;

[0010] The intelligent circuit breaker is located between the charging gun and a power module for supplying power to the charging gun.

[0011] In order to solve the above technical problems, another technical scheme adopted by the present application is as follows:

[0012] A charging pile for intelligent overcurrent protection, comprising a power module, an intelligent circuit breaker, a charging pile controller and a charging gun;

[0013] The intelligent circuit breaker is electrically connected with the charging gun at one end and electrically connected with the power module at the other end.

[0014] The charging pile controller is in communication connection with the power module and the intelligent circuit breaker, and realizes the steps in the intelligent overcurrent protection method.

[0015] The beneficial effects of the present application are that the intelligent overcurrent protection method and the charging pile of the present application are internally provided with an intelligent circuit breaker, and the overcurrent protection threshold of the intelligent circuit breaker is set according to the charging specifications of the electric vehicle, and the overcurrent protection threshold is set in combination with the demand current of the electric vehicle, so that the overcurrent protection of the charging process of electric vehicles of different specifications is realized, and the overcurrent caused by short circuit failure of the charging pile is greatly avoided, so that the replacement and maintenance of the charging loop device of the electric vehicle are avoided. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 The flowchart of the intelligent overcurrent protection method of the embodiment of the present application is shown.

[0017] Figure 2 The structural example diagram of the intelligent overcurrent protection charging pile of the embodiment of the present application is shown. DETAILED DESCRIPTION

[0018] To explain the technical content, the achieved purposes and effects of the present application in detail, the following will be explained in combination with the embodiments and the drawings.

[0019] Please refer to Figure 1 An intelligent overcurrent protection method, comprising the steps of:

[0020] S1, when it is detected that the charging gun is connected with the electric vehicle, obtaining the charging information of the electric vehicle including the demand upper limit current and the demand current;

[0021] S2, setting the overcurrent protection threshold of the intelligent circuit breaker according to the demand upper limit current and the maximum current upper limit of the charging pile, and entering the starting process of the charging pile charging;

[0022] S3, in combination with the intelligent circuit breaker, overcurrent protection is performed on the charging of the electric vehicle based on the demand current and the overcurrent protection threshold;

[0023] The intelligent circuit breaker is located between the charging gun and the power module for supplying power to the charging gun.

[0024] From the above description, the beneficial effects of the present application are that the intelligent overcurrent protection method and charging pile of the present application are internally installed with an intelligent circuit breaker, and the overcurrent protection threshold value of the intelligent circuit breaker is set according to the charging specifications of the electric vehicle, and the demand current of the electric vehicle is combined, so that the overcurrent protection of the charging process of electric vehicles of different specifications is realized, and the overcurrent caused by the short circuit fault of the charging pile is greatly avoided, thereby causing the replacement and maintenance of the charging loop device of the electric vehicle.

[0025] Further, the determination of the overcurrent protection threshold value is specifically:

[0026] If the demand upper limit current is greater than the maximum current upper limit of the charging pile, a preset first multiple of the maximum current upper limit of the charging pile is taken as the overcurrent protection threshold value, otherwise, a preset second multiple of the demand upper limit current is taken as the overcurrent protection threshold value.

[0027] From the above description, by comparing the maximum current upper limit of the charging pile and the demand upper limit current of the electric vehicle, the value of the overcurrent protection threshold value is determined, which ensures that the value of the overcurrent protection threshold value can form effective overcurrent protection.

[0028] Further, step S3 includes the steps of:

[0029] According to the demand current, a current control command is issued to the power module, and the charging current size is monitored in real time, if the current size is greater than the demand current and has not reached the overcurrent protection threshold value, an instruction of active disconnection is sent to the intelligent circuit breaker.

[0030] From the above description, according to the demand current control current size, when the current size exceeds the demand current, that is, the power module may fail, although the overcurrent protection threshold value has not been reached, that is, the intelligent circuit breaker has not reacted, the intelligent circuit breaker can still be controlled to actively disconnect to perform the first level of overcurrent protection.

[0031] Further, step S3 includes the steps of:

[0032] Receiving the overcurrent information reported by the intelligent circuit breaker, and issuing a stop power supply instruction to the power module;

[0033] The overcurrent information is monitored in real time by the intelligent circuit breaker, and when the charging current is greater than the overcurrent protection threshold value, the intelligent circuit breaker actively disconnects and reports.

[0034] From the above description, the intelligent circuit breaker itself also monitors the size of the charging current, and if the current is greater than the overcurrent protection threshold value, the intelligent circuit breaker actively disconnects and reports the overcurrent, and the power module is controlled by the charging pile controller to stop power supply.

[0035] Further, step S2 further comprises the steps of:

[0036] S21, set the action time of the overcurrent protection, the vehicle fuse melting time > the action time of the overcurrent protection > the time of the short circuit protection.

[0037] From the above description, it can be seen that the action time of the overcurrent protection is also set to adapt to the protection of the charging process of different specifications of electric vehicles.

[0038] Please refer to Figure 2 A smart overcurrent protection charging pile, comprising a power module, a smart circuit breaker, a charging pile controller and a charging gun;

[0039] One end of the smart circuit breaker is electrically connected with the charging gun, and one end is electrically connected with the power module;

[0040] The charging pile controller is in communication connection with the power module and the smart circuit breaker, and realizes the steps in the above-mentioned method of smart overcurrent protection.

[0041] From the above description, it can be seen that the beneficial effects of the present application are that the method of smart overcurrent protection of the present application and the charging pile, the smart circuit breaker is installed in the internal of the charging pile, and the overcurrent protection threshold of the smart circuit breaker is set according to the charging specification of the electric vehicle, and the demand current of the electric vehicle is combined, so as to realize the overcurrent protection of the charging process of different specifications of electric vehicles, greatly avoid the overcurrent caused by the short circuit fault of the charging pile, and thus cause the replacement and maintenance of the charging loop device of the electric vehicle.

[0042] Further, the power module comprises a power module controller and a DCDC power module;

[0043] The charging pile controller is in communication connection with the power module controller, and is in communication connection with the DCDC power module by the power module controller.

[0044] From the above description, it can be seen that the power module specifically comprises a power module controller and a DCDC power module, and the charging pile controller specifically controls the output of the DCDC power module by issuing commands to the power module controller.

[0045] Further, the charging pile controller and the power module controller are in LAN communication, and the power module controller and the DCDC power module are in CAN communication.

[0046] From the above description, it can be seen that the communication between the charging pile controller, the power module controller and the DCDC power module is as shown above, which is a specific embodiment of the present application.

[0047] Further, a direct current meter is connected between the intelligent circuit breaker and the charging gun, and the charging pile controller is connected with the direct current meter.

[0048] As described above, the charging pile controller obtains the information of the charging current by connecting with the direct current meter between the intelligent circuit breaker and the charging gun.

[0049] Further, the communication between the charging pile controller and the intelligent circuit breaker and the communication between the charging pile controller and the direct current meter are RS485 communication, and the communication between the charging pile controller and the electric vehicle through the charging gun is CAN communication.

[0050] As described above, the communication between the charging pile controller and the intelligent circuit breaker and the communication between the charging pile controller and the direct current meter are as shown above, which is a specific embodiment of the present application.

[0051] The intelligent overcurrent protection method and the charging pile are suitable for the scenario that the charging pile needs to adapt to different models of electric vehicles for charging, such as charging piles in charging stations.

[0052] Please refer to Figure 1 The embodiment one of the present application is:

[0053] The intelligent overcurrent protection method comprises the steps of:

[0054] S1, when it is detected that the charging gun is connected with the electric vehicle, obtaining the charging information of the electric vehicle including the demand upper limit current and the demand current.

[0055] In this embodiment, after the charging gun is connected with the electric vehicle, the charging pile controller receives the information of the electric vehicle including the demand upper limit current, SOC, upper limit voltage and demand current through CAN communication. Among them:

[0056] The demand upper limit current: this current is the maximum current that the electric vehicle may need during the entire charging process.

[0057] The demand current: this current is the real-time current of the electric vehicle during charging, and the charging current is not allowed to exceed this current. The charging module can be controlled by the charging pile controller to charge without exceeding this current.

[0058] S2, setting an overcurrent protection threshold for the intelligent circuit breaker according to the demand upper limit current and the maximum current upper limit of the charging pile, and entering the starting process of the charging pile charging;

[0059] The determination of the overcurrent protection threshold is specifically:

[0060] determining whether the demand upper limit current is greater than the maximum current upper limit of the charging pile, if yes, taking a preset first multiple of the maximum current upper limit of the charging pile as the overcurrent protection threshold, otherwise taking a preset second multiple of the demand upper limit current as the overcurrent protection threshold.

[0061] In the embodiment, the first preset multiple and the second preset multiple are both 1.2 times, and in other equivalent embodiments, they can be set according to actual needs.

[0062] The charging pile controller determines whether the demand upper limit current exceeds the maximum current upper limit of the charging pile according to the collected electric vehicle information, if yes, takes 1.2 times of the maximum current of the charging pile as the overcurrent protection value, otherwise takes 1.2 times of the demand upper limit current of the electric vehicle as the overcurrent protection value. Through RS485 communication, the intelligent circuit breaker is set as the overcurrent protection threshold of this charging process.

[0063] Step S2 further includes the steps of:

[0064] S21, set the action time for overcurrent protection, the vehicle fuse blowing time > the action time of overcurrent protection > the time of short circuit protection.

[0065] The charging pile controller sets the overcurrent protection action time through RS485, which can be set according to actual conditions, such as 1-5ms. The vehicle fuse blowing time > the action time of overcurrent protection > the time of short circuit protection, and the vehicle fuse blowing time is generally more than 10ms.

[0066] After the charging pile controller completes the setting of the overcurrent protection threshold, it enters the normal starting process of the charging pile.

[0067] S3, in combination with the intelligent circuit breaker, overcurrent protection is performed on the charging of the electric vehicle based on the demand current and the overcurrent protection threshold;

[0068] The intelligent circuit breaker is located between the charging gun and the power module that supplies power to the charging gun.

[0069] Step S3 includes the steps of:

[0070] According to the demand current, the current control command is issued to the power module, and the charging current size is monitored in real time, if the current size is greater than the demand current and has not reached the overcurrent protection threshold, the command of active disconnection is sent to the intelligent circuit breaker.

[0071] Step S3 includes the steps of:

[0072] Receive the overcurrent information reported by the intelligent circuit breaker, and issue the command of stopping power supply to the power module;

[0073] The overcurrent information is monitored by the intelligent circuit breaker in real time, and when the charging current is greater than the overcurrent protection threshold, the intelligent circuit breaker is actively disconnected and the state is reported to the charging pile controller.

[0074] In this embodiment, when the intelligent circuit breaker detects overcurrent (charging current greater than overcurrent protection threshold), it is actively disconnected, and the state is reported to the charging pile controller, which issues instructions to stop the power module from outputting according to the state.

[0075] At the same time, if the charging pile controller detects overcurrent (charging current greater than required current), but does not reach the overcurrent protection threshold set by the circuit breaker in advance, the intelligent circuit breaker is controlled to be disconnected, serving as a priority first protection.

[0076] Please refer to Figure 2 , the second embodiment of the present application is:

[0077] A charging pile with intelligent overcurrent protection includes a power module, an intelligent circuit breaker, a charging pile controller, a DC ammeter, and a charging gun.

[0078] In this embodiment, a charging pile with intelligent overcurrent protection mainly consists of a DCDC power module, an intelligent circuit breaker, a DC ammeter, a charging gun, a charging pile controller, and a power module controller.

[0079] One end of the intelligent circuit breaker is electrically connected to the charging gun, and the other end is electrically connected to the power module.

[0080] The charging pile controller is in communication with the power module controller, and the power module controller is in communication with the DCDC power module.

[0081] A DC ammeter is connected between the intelligent circuit breaker and the charging gun, and the charging pile controller is connected to the DC ammeter.

[0082] The charging pile controller is in communication with the power module and the intelligent circuit breaker.

[0083] The charging pile controller and the power module controller are in LAN communication, and the power module controller and the DCDC power module are in CAN communication.

[0084] The charging pile controller and the intelligent circuit breaker are in RS485 communication, and the charging pile controller and the DC ammeter are in RS485 communication.

[0085] In this embodiment:

[0086] The charging pile controller is a core component of the charging pile, has a CAN interface, receives and sends messages between the electric vehicle BMS and the charging pile, collects electric vehicle battery information including required upper limit current, SOC, upper limit voltage and required current, has an RS485 communication interface before the intelligent circuit breaker, sets the protection threshold and protection design of the intelligent circuit breaker, feeds back the running state of the intelligent circuit breaker, and can also control the opening and closing of the intelligent circuit breaker in real time.

[0087] The DCDC power module provides the output power and output voltage required by the electric vehicle, and can be composed of one module or multiple modules.

[0088] The intelligent circuit breaker has a rapid short-circuit protection function below 1ms; has a rapid sampling function to collect current, can quickly disconnect the main circuit function when overcurrent, and the current value and time of the rapid disconnection overcurrent protection can be default values or can be set through the RS485 communication interface; the intelligent circuit breaker can also accept on-off control through the RS485 communication interface; the intelligent circuit breaker has a one-time short-circuit protection function in the case of main device damage.

[0089] The split charging pile is a device for connecting the charging pile and the electric vehicle.

[0090] The DC ammeter is a metering device for the charging power of the electric vehicle, connected to the charging pile controller through RS485.

[0091] The power module controller communicates with the DCDC power module through CAN, controls the start and stop of the DCDC power module and the running power, has an Ethernet communication interface and communicates with the charging pile controller, forwards the running instructions executed by the charging pile, and feeds back the DCDC state and the like.

[0092] In the embodiment, the charging pile controller is in communication connection with the power module and the intelligent circuit breaker, and realizes the steps in the above-mentioned intelligent overcurrent protection method.

[0093] In summary, the intelligent overcurrent protection method and the charging pile provided by the application install an intelligent circuit breaker in the charging pile, set the overcurrent protection threshold of the intelligent circuit breaker according to the charging specifications of the electric vehicle, and combine the required current of the electric vehicle, so as to realize the overcurrent protection of the charging process of electric vehicles of different specifications, greatly avoid overcurrent caused by short-circuit failure of the charging pile, and thus avoid replacement and maintenance of the electric vehicle charging circuit device.

[0094] The conventional charging pile cannot give priority to disconnecting the fuse of the charging pile when different electric vehicles are overcurrent or short-circuit protected, and cannot achieve the purpose of protecting the electric vehicle devices. The application provides a kind of intelligent overcurrent protection method and charging pile, which is used for different models of electric vehicles after short-circuit fault, and can still give priority to the fuse protection in the electric vehicle. The overcurrent threshold setting and overcurrent time setting can be realized to adapt to the protection of different specifications of electric vehicle charging process, greatly reducing the replacement and maintenance of electric vehicle charging loop devices due to charging pile failure.

[0095] The above-mentioned is only the embodiment of the application, and does not limit the patent scope of the application. Any equivalent transformation, direct or indirect application in related technical fields based on the content of the specification and drawings is also included in the patent protection scope of the application.

Claims

1. A method of intelligent overcurrent protection, characterized by, The method comprises the steps of: S1, when detecting that the charging gun establishes a connection with the electric vehicle, acquiring charging information of the electric vehicle including a demand upper limit current and a demand current; S2, setting an overcurrent protection threshold for the intelligent circuit breaker according to the demand upper limit current and a maximum current upper limit of the charging pile, and entering a starting process of charging of the charging pile; The determination of the overcurrent protection threshold is specifically: judging whether the demand upper limit current is greater than the maximum current upper limit of the charging pile, if yes, taking a preset first multiple of the maximum current upper limit of the charging pile as the overcurrent protection threshold, otherwise, taking a preset second multiple of the demand upper limit current as the overcurrent protection threshold; S3, in combination with the intelligent circuit breaker, performing overcurrent protection on charging of the electric vehicle based on the demand current and the overcurrent protection threshold; The intelligent circuit breaker is located between the charging gun and a power module that supplies power for the charging gun; Step S3 comprises the steps of: issuing a current control command to the power module according to the demand current, and monitoring the size of the charging current in real time, if the size of the current is greater than the demand current and has not reached the overcurrent protection threshold, sending an instruction of active disconnection to the intelligent circuit breaker.

2. The method of intelligent overcurrent protection according to claim 1, wherein, Step S3 comprises the steps of: Receiving overcurrent information reported by the intelligent circuit breaker, and issuing an instruction of stopping power supply to the power module; The overcurrent information is monitored in real time by the intelligent circuit breaker on the size of the charging current, and is reported after active disconnection when it is detected that the charging current is greater than the overcurrent protection threshold.

3. The method of intelligent overcurrent protection of claim 1, wherein, Step S2 further comprises the step of: S21, setting an action time for overcurrent protection, the vehicle fuse blowing time > the action time of overcurrent protection > the time of short circuit protection.

4. A smart over-current protection charging pile, characterized in that, The power module, the intelligent circuit breaker, the charging pile controller and the charging gun are included; One end of the intelligent circuit breaker is electrically connected with the charging gun, and the other end is electrically connected with the power module; The charging pile controller is in communication connection with the power module and the intelligent circuit breaker, and realizes the steps in the method of intelligent overcurrent protection according to any one of claims 1-3.

5. The intelligent overcurrent protection charging pile according to claim 4, characterized in that, The power module comprises a power module controller and a DCDC power module; The charging pile controller is in communication connection with the power module controller, and is in communication connection with the DCDC power module by the power module controller.

6. The intelligent overcurrent protection charging pile according to claim 5, characterized in that, The charging pile controller and the power module controller are in LAN communication, and the power module controller and the DCDC power module are in CAN communication.

7. The intelligent overcurrent protection charging pile according to claim 4, characterized in that, A DC ammeter is connected between the intelligent circuit breaker and the charging gun, and the charging pile controller is connected with the DC ammeter.

8. The intelligent overcurrent protection charging pile according to claim 7, characterized in that, The charging pile controller and the intelligent circuit breaker are in RS485 communication, and the charging pile controller and the DC ammeter are in CAN communication between the charging gun and the electric vehicle.

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