Intelligent plugging safety control method, device and equipment for mobile energy storage equipment and storage medium

Abstract

The invention relates to the technical field of plugging safety, and discloses an intelligent plugging safety control method for mobile energy storage equipment, which comprises the following steps: S1, an intelligent card completes non-contact identification through an NFC module, and an intelligent plugging connector is taken down; s2, the intelligent plugging connector is connected with an interface of the mobile energy storage equipment, meanwhile, the sensor recognizes the distance and transmits distance information to the control unit, when the distance information received by the control unit is smaller than a preset threshold value, the control unit controls the second electromagnetic lock to be locked, the intelligent plugging connector is connected with the mobile energy storage equipment, and then the mechanical lock is manually operated; and S3, the control unit dynamically adjusts the pre-charging current, the mobile energy storage device pre-charges the bus through a bus pre-charging loop, and when the control unit receives that the difference value between the bus and the load voltage is smaller than a preset threshold value, the control unit controls the main relay to be closed, the pre-charging relay to be disconnected, and the intelligent plug connector formally works in a live-line mode. According to the invention, the safety of plugging operation can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of plug safety, in particular to an intelligent plug safety control method and device for mobile energy storage equipment, equipment and storage medium. BACKGROUND

[0002] The mobile energy storage equipment supplies power to the load, and the mobile energy storage equipment is connected with the load through a plug connector. At present, the plug connector is often directly connected with the mobile energy storage equipment through a mechanical structure, and it is impossible to objectively record the log of special person management (that is, there is no fixed person responsible, and anyone can operate), and it is difficult to trace the plug operator and specific behavior, thereby weakening the safety control.

[0003] Moreover, after the plug connector is connected with the mobile energy storage equipment, a direct pre-charging (fixed current or resistance) mode is often used to pre-charge the bus, which may cause the current through the bus to be too large instantaneously, resulting in capacitor overvoltage breakdown, relay contact welding adhesion, shortened capacitor life, increased equipment failure rate, abnormal load start or system protection misoperation (unscheduled shutdown) due to voltage fluctuation, shortened load service life, data loss or production process interruption. SUMMARY

[0004] In order to overcome the shortcomings of the prior art, one of the purposes of the present application is to provide an intelligent plug safety control method for mobile energy storage equipment, which can leave marks for operation, improve plug operation safety, improve the service life of the connector, reduce the equipment failure rate, improve the service life of the load, and make the load end work normally.

[0005] The technical solution adopted by the present application is as follows: an intelligent plug safety control method for mobile energy storage equipment, comprising the following steps:

[0006] S1: the smart card is close to the intelligent plug connector to complete non-contact identification through the NFC module, the control unit receives the information in the smart card, the control unit controls the unlocking of the limiting structure for limiting the intelligent plug connector, and the intelligent plug connector is taken off from the limiting structure;

[0007] S2: the intelligent plug connector is connected with the mobile energy storage equipment interface, at the same time, the sensor on the intelligent plug connector identifies the distance between the intelligent plug connector contact point and the mobile energy storage equipment interface contact point, and transmits the distance information to the control unit on the intelligent plug connector, when the control unit receives the distance information detected by the sensor is less than the preset threshold, the control unit controls the second electromagnetic lock to be locked, the intelligent plug connector is connected with the mobile energy storage equipment, and the mechanical lock is manually operated again to connect the intelligent plug connector with the mobile energy storage equipment again;

[0008] S3: The control unit dynamically adjusts the pre-charging current flowing through the bus pre-charging circuit, and the mobile energy storage device pre-charges the bus through the bus pre-charging circuit. When the control unit receives that the voltage difference between the bus and the load is less than the preset threshold, the control unit controls the main relay to close and the pre-charging relay to open, and the smart plug-in connector formally works under the voltage.

[0009] As a preferred embodiment of the present application, S2 further comprises the following steps:

[0010] S21: The smart plug-in connector completes non-contact identification through the NFC module close to the mobile energy storage device interface protection shell, the mobile energy storage device interface protection shell is opened, the smart plug-in connector is connected with the mobile energy storage device interface, and the display module on the smart plug-in connector for displaying the opening and closing state of the second electromagnetic lock displays a red light;

[0011] S22: The Hall displacement sensor on the smart plug-in connector collects the distance between the contact point of the smart plug-in connector and the contact point of the mobile energy storage device interface at a sampling frequency of 1 kHz per second, and transmits the distance information to the control unit on the smart plug-in connector;

[0012] S23: When the control unit receives the distance information detected by the Hall displacement sensor and the distance information is less than the preset threshold, the control unit controls the second electromagnetic lock to lock, and at the same time, the control unit controls the display module on the smart plug-in connector to display a green light, and the smart plug-in connector is connected with the mobile energy storage device;

[0013] S24: The smart plug-in connector is connected with the mobile energy storage device again by manually operating the mechanical lock.

[0014] As a preferred embodiment of the present application, S3 further comprises the following steps:

[0015] S31: The storage module on the smart plug-in connector transmits the plug-in life information and the historical plug-in over-temperature / over-current alarm information to the control unit, the NTC thermistor on the bus pre-charging circuit transmits the collected temperature information to the control unit, the bus voltage sensor transmits the collected bus voltage value to the control unit, and the load input end voltage sensor transmits the collected load voltage value to the control unit;

[0016] S32: When the control unit receives the plug-in life information of the storage module and the historical plug-in over-temperature / over-current alarm information, the control unit controls the pre-charging relay on the branch pre-charging circuit with a large resistance value to close, so as to forcibly adopt low-current long-time pre-charging;

[0017] When the control unit receives the temperature information collected by the NTC thermistor and the temperature information is greater than the preset threshold, the control unit controls the pre-charging relay on the branch pre-charging circuit with a large resistance value to close, so as to reduce the pre-charging current flowing through the bus and realize automatic de-rating pre-charging;

[0018] When the control unit receives that the voltage difference between the bus voltage sensor and the load input end voltage sensor is greater than the preset threshold value, the control unit controls the pre-charging relay on the branch pre-charging circuit with large resistance to be closed, and the control unit controls the pre-charging relay on the branch pre-charging circuit to be closed and opened according to the voltage difference every 50-100 ms, so as to realize the pre-charging and slow start by gradually switching and gradually increasing the current;

[0019] S33: The mobile energy storage device pre-charges the bus through the bus pre-charging circuit;

[0020] S34: When the control unit receives that the voltage difference between the bus voltage sensor and the load input end voltage sensor is less than the preset threshold value, the control unit controls the main relay to be closed and the pre-charging relay to be opened, and the intelligent plug-in connection is formally electrified.

[0021] As a preferred embodiment of the application, the plug-in life in S31 is evaluated by the contact temperature and the pre-charging current, as shown in formulas (1), (2) and (3),

[0022]

[0023] In formula (1), L used is the life consumption integral value of this time plug-in, N is the total sampling number in the pre-charging stage, ΔT i is the temperature rise value of the i-th sampling, I i is the pre-charging current of the i-th sampling, and Δt is the time interval of each sampling.

[0024] In formula (2), L std is the design standard single consumption integral value.

[0025] In formula (3), N o is the design service life number.

[0026] The second object of the application is to provide an intelligent plug-in safety device for a mobile energy storage device, which comprises an intelligent card and an intelligent plug-in connector, a first NFC tag module arranged in the intelligent card, a limiting structure arranged on the mobile energy storage device, a second NFC tag module arranged on the interface protection shell of the mobile energy storage device, and an NFC read-write module arranged in the intelligent plug-in connector.

[0027] The intelligent card and the intelligent plug-in connector complete non-contact identification through the first NFC tag module and the NFC read-write module, and are used to take the intelligent plug-in connector off the limiting structure.

[0028] The intelligent plug-in connector and the interface protection shell of the mobile energy storage device complete non-contact identification through the NFC read-write module and the second NFC tag module, and are used to insert the intelligent plug-in connector into the interface of the mobile energy storage device.

[0029] The third object of the present application is to provide an electronic device comprising a memory for storing a computer program and a processor for executing the computer program to implement the smart plug-in safety control method for mobile energy storage device as described above.

[0030] The fourth object of the present application is to provide a computer readable storage medium for storing a computer program, which, when executed by a processor, implements the smart plug-in safety control method for mobile energy storage device as described above.

[0031] Compared with the prior art, the present application has the following advantages:

[0032] 1) The present application sets up double use safety barriers through non-contact identification of the smart card and the limiting structure, non-contact identification of the smart plug-in connector and the interface protection shell of the mobile energy storage device, before the mobile energy storage device formally supplies power to the load through the smart plug-in connector, so that only the operator with the smart card can take down the smart plug-in connector, and only the smart plug-in connector matching the interface of the mobile energy storage device can be inserted, preventing misplug, and the non-contact identification can be completed only by approaching each other, which is easy to operate.

[0033] 2) The present application controls the opening and closing of the second electromagnetic lock through the Hall displacement sensor and the control unit, and informs the operator of the current state (locked or unlocked) of the second electromagnetic lock through the display module, so that the operator can directly know the connection status of the smart plug-in connector and the interface of the mobile energy storage device, and at the same time, the smart plug-in connector and the mobile energy storage device are stably connected, and the mechanical lock is added, which further improves the connection stability of the smart plug-in connector and the mobile energy storage device.

[0034] 3) The present application dynamically adjusts the current flowing through the bus pre-charging circuit through the control unit, so that the core components such as the device, the interface and the bus are always in the most safe and most suitable working interval, avoiding the occurrence of extreme working conditions such as electric arc, current shock and over-temperature, making the bus capacitor charging process conform to the exponential curve, avoiding voltage mutation, preventing the generation of electric arc, preventing the welding of relay contact, prolonging the service life of the smart plug-in connector, reducing the equipment failure rate, adapting to different load requirements, improving the service life of the load, and allowing the load end to operate normally. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 is a smart plug-in safety control method flowchart for mobile energy storage device of the present application;

[0036] Figure 2 is a bus pre-charging circuit schematic diagram of the smart plug-in safety control method for mobile energy storage device of the present application. DETAILED DESCRIPTION

[0037] The features and advantages of the present application will be more apparent from the following detailed description, taken in conjunction with the accompanying drawings. It is understood that the present application can be embodied in many different forms and that the description and drawings are to be regarded as illustrative rather than restrictive.

[0038] The present application will be described in detail below with reference to the accompanying drawings and embodiments.

[0039] The intelligent plug-in safety device includes an intelligent card, an intelligent plug-in connector, a limiting structure arranged on the mobile energy storage device, a control unit, a Hall displacement sensor, a storage module, a plurality of pre-charging relays, a main relay, a plurality of pre-charging resistors with different resistances, a capacitor, a bus voltage sensor, a load input voltage sensor, an NTC thermistor, a display module, and a second electromagnetic lock and a mechanical lock arranged on the intelligent plug-in connector.

[0040] The control unit is used to control the pre-charging relays and the main relay to open and close, respectively, and control the display module to light green or red, and control the second electromagnetic lock to lock and unlock. The Hall displacement sensor is used to detect the distance between the contact points of the intelligent plug-in connector and the interface contact points of the mobile energy storage device, and transmit the distance information to the control unit. The storage module is used to store the plug-in life information of the intelligent plug-in connector, and transmit the plug-in life information to the control unit. The bus voltage sensor and the load input voltage sensor are used to detect the voltage, respectively, and transmit the detected voltage value to the control unit. The NTC thermistor is used to detect the temperature of the bus pre-charging loop, and transmit the detected temperature information value to the control unit. The NTC thermistor is attached to the surface of the pre-charging resistor or embedded in the insulation layer of the bus capacitor.

[0041] The intelligent plug-in safety control method for the mobile energy storage device, as shown in Figure 1 includes the following steps:

[0042] S1: The intelligent card approaches the intelligent plug-in connector to complete non-contact identification through the NFC module. The control unit receives the information in the intelligent card. The control unit controls the limiting structure for limiting the intelligent plug-in connector to unlock, and removes the intelligent plug-in connector from the limiting structure.

[0043] In this embodiment, the limiting structure can be a first electromagnetic lock or an electronic lock. The limiting structure is arranged on the mobile energy storage device. When the intelligent plug-in connector is not in use, the intelligent plug-in connector is fixed on the mobile energy storage device by the first electromagnetic lock to prevent the intelligent plug-in connector from being moved at will. The intelligent card approaches the intelligent plug-in connector to complete non-contact identification through the NFC module. The control unit controls the first electromagnetic lock to unlock, and removes the intelligent plug-in connector from the limiting structure.

[0044] S2: The smart plug-in connector is connected to the interface of the mobile energy storage device. At the same time, the sensor on the smart plug-in connector identifies the distance between the contact point of the smart plug-in connector and the contact point of the interface of the mobile energy storage device, and transmits the distance information to the control unit on the smart plug-in connector. When the control unit receives the distance information detected by the sensor and it is less than a preset threshold, the control unit controls the second electromagnetic lock to lock, and the smart plug-in connector is connected to the mobile energy storage device. Then, the mechanical lock is manually operated to connect the smart plug-in connector to the mobile energy storage device again.

[0045] Specifically, S2 also includes the following steps:

[0046] S21: When the smart plug-in connector approaches the protective shell of the mobile energy storage device interface, it completes contactless identification via the NFC module. The protective shell of the mobile energy storage device interface opens, and the smart plug-in connector connects to the interface of the mobile energy storage device. The display module on the smart plug-in connector, which is used to display the open and closed status of the second electromagnetic lock, displays a red light.

[0047] S22: The Hall displacement sensor on the smart plug-in connector collects the distance between the smart plug-in connector contact point and the mobile energy storage device interface contact point at a sampling frequency of 1kHz per second, and transmits the distance information to the control unit on the smart plug-in connector.

[0048] S23: When the control unit receives the distance information detected by the Hall displacement sensor, which is less than the preset threshold, the control unit controls the second electromagnetic lock to lock. At the same time, the control unit controls the display module on the smart plug-in connector to display a green light, and the smart plug-in connector is connected to the mobile energy storage device.

[0049] S24: Manually operate the mechanical lock again to reconnect the smart plug-in connector to the mobile energy storage device.

[0050] S3: The control unit dynamically adjusts the pre-charge current flowing through the bus pre-charge circuit. The mobile energy storage device pre-charges the bus through the bus pre-charge circuit. When the control unit receives a voltage difference between the bus and the load that is less than a preset threshold, the control unit controls the main relay to close and the pre-charge relay to open, and the intelligent plug-in connector is officially energized and put into operation.

[0051] In this embodiment, as Figure 2 As shown, multiple precharge relays are connected in series with corresponding precharge resistors to form multiple branch precharge circuits. The multiple branch precharge circuits and the main circuit are connected in parallel. The main circuit is equipped with a main relay. One end of the parallel circuit of the multiple branch precharge circuits and the main circuit is connected to the interface of the mobile energy storage device, and the other end is connected to the fuse. The fuse is connected to the load end.

[0052] Specifically, S3 also includes the following steps:

[0053] S31: The storage module on the smart pluggable connector transmits pluggable life information and historical pluggable over-temperature / over-current alarm information to the control unit; the NTC thermistor on the bus pre-charge circuit transmits the collected temperature information to the control unit; the bus voltage sensor transmits the collected bus voltage value to the control unit; and the load input voltage sensor transmits the collected load voltage value to the control unit.

[0054] In S31, the insertion and removal life is evaluated by contact temperature and pre-charge current, as shown in formulas (1), (2), and (3).

[0055]

[0056] In formula (1), L used The lifetime consumption integral value for this insertion / removal is given, where N is the total number of samplings during the pre-charge phase, and ΔT is the value of the insertion / removal. i Let I be the temperature rise value of the i-th sample. i Let be the pre-charge current for the i-th sample, and Δt be the time interval between each sample.

[0057] In formula (2), L std The standard single-use consumption points are designed to be known values ​​set at the factory.

[0058] In formula (3), N o The number of times the design service life is used.

[0059] In this embodiment, ΔT i This refers to continuously collecting the load input temperature T(t) (every 10-20 ms) and the ambient reference temperature T during the insertion / removal cycle. o Difference, I i Δt is obtained by real-time current acquisition and refers to the time from the start of pre-charging to the completion of pre-charging.

[0060] In this embodiment, the plug-in lifespan is the remaining lifespan of the smart plug-in connector.

[0061] S32: When the control unit receives the insertion and removal life information of the storage module which is greater than the preset threshold and / or the historical insertion and removal over-temperature / over-current alarm information, the control unit closes the pre-charge relay on the branch pre-charge circuit with a large control resistor value, and forces the use of low current long-term pre-charge.

[0062] When the temperature information received by the control unit from the NTC thermistor is greater than the preset threshold, the control unit controls the precharge relay on the precharge circuit with a large resistance value to close, thereby reducing the precharge current flowing through the bus and realizing automatic derating precharge.

[0063] When the control unit receives the bus voltage sensor and the load input voltage sensor voltage difference greater than the preset threshold (the measured value of the bus voltage sensor minus the measured value of the load input voltage sensor), the control unit controls the pre-charging relay on the branch pre-charging circuit with large resistance to close, and the control unit controls the pre-charging relay on the branch pre-charging circuit with different resistance to close and open every 50-100 ms, so as to gradually increase the current and realize pre-charging slow start.

[0064] In this embodiment, only the pre-charging relay on one branch of the bus pre-charging circuit is closed, and the pre-charging relays on the other branches are opened.

[0065] In this embodiment, low-current long-time pre-charging is forced to be used, which can prevent the current from being too large and avoid local overheating and secondary failure.

[0066] In this embodiment, the adjustment according to the voltage difference is, for example, stage 1: high voltage difference stage, when the bus voltage difference is large (such as > 70% of the target voltage), only the pre-charging relay on the branch with the largest resistance is closed, and the current is small and the charging is slow.

[0067] Stage 2: medium voltage difference stage, when the bus voltage difference decreases to 30%-70% of the target voltage, the pre-charging relay on the branch with medium resistance is closed, the current increases slightly, and the charging is accelerated.

[0068] Stage 3: low voltage difference stage, when the bus voltage difference is less than 10%-30% of the target voltage, the pre-charging relay on the branch with the smallest resistance is closed, the current is maximum, and the charging is completed quickly.

[0069] Finally: the voltage difference is very small, and the voltage difference is less than 5%-10% of the target voltage, the pre-charging relays are all opened, the main circuit relay is closed, and the system is formally put into operation.

[0070] In this embodiment, when the control unit receives the plug-in life information of the storage module greater than 90%, the control unit controls the pre-charging relay on the branch pre-charging circuit with large resistance to close, and forces to use low-current long-time pre-charging, 90% as the "aging acceleration-risk intervention point", which can not only ensure that most of the life can be fully utilized, but also can actively "mildly" protect in the last stage and reduce the failure rate of the last 10%.

[0071] When the control unit receives the temperature information collected by the NTC thermistor greater than 60℃, the control unit controls the pre-charging relay on the branch pre-charging circuit with large resistance to close, so as to reduce the pre-charging current flowing through the bus and realize automatic de-rating pre-charging. The 60℃ threshold setting can ensure that even if there is an occasional impact for a short time, the device still has sufficient safety margin and will not be further deteriorated due to pre-charging.

[0072] When the control unit receives the plug-in life information of the storage module is less than 20%, the control unit controls all relays to be opened, and controls the alarm to alarm.

[0073] S33: The mobile energy storage device precharges the bus through the bus precharge circuit.

[0074] S34: When the control unit receives the voltage difference between the bus voltage sensor and the load input end voltage sensor is less than the preset threshold, the control unit controls the main relay to be closed and the precharge relay to be opened, and the smart plug-in connector is formally powered on.

[0075] The second purpose of the application is to provide a smart plug-in safety device for a mobile energy storage device, which comprises a smart card and a smart plug-in connector, a first NFC tag module arranged in the smart card, a limiting structure arranged on the mobile energy storage device, a second NFC tag module arranged on the interface protection shell of the mobile energy storage device, a control unit, a Hall displacement sensor, a storage module, a plurality of precharge relays, a main relay, a plurality of precharge resistors with different resistances, a capacitor, a bus voltage sensor, a load input end voltage sensor, an NFC read-write module, an NTC thermistor, a display module, and a second electromagnetic lock and a mechanical lock arranged on the smart plug-in connector.

[0076] The smart card and the smart plug-in connector complete non-contact identification through the first NFC tag module and the NFC read-write module, which is used to remove the smart plug-in connector from the limiting structure.

[0077] The smart plug-in connector and the interface protection shell of the mobile energy storage device complete non-contact identification through the NFC read-write module and the second NFC tag module, which is used to insert the smart plug-in connector into the interface of the mobile energy storage device.

[0078] The control unit is used to control the precharge relays and the main relay to be opened and closed respectively, and control the display module to be green or red, and the second electromagnetic lock to be locked and unlocked.

[0079] In this embodiment, the smart plug-in connector can respectively open the limiting structure and the interface protection shell of the mobile energy storage device through non-contact identification with the smart card and the interface protection shell of the mobile energy storage device, only one read-write module is needed, the hardware cost can be reduced, the installation and debugging cost is low, and the data can be centrally managed, the smart plug-in connector can be directly connected to the cloud through the control unit of the smart plug-in connector, the smart plug-in connector can be removed from the limiting structure, the smart plug-in connector can be connected to the interface of the mobile energy storage device to transmit data to the cloud, and the subsequent use data can be traced.

[0080] The Hall displacement sensor is used to detect the distance between the contact point of the smart plug-in connector and the contact point of the interface of the mobile energy storage device, and transmit the distance information to the control unit.

[0081] The storage module is used for storing the smart plug-in connector plug-in life information and transmitting the plug-in life information to the control unit.

[0082] The bus voltage sensor and the load input voltage sensor are respectively used for detecting voltage and transmitting the detected voltage value to the control unit.

[0083] The NTC thermistor is used for detecting the bus pre-charging loop temperature and transmitting the detected temperature information value to the control unit, and the NTC thermistor is attached to the surface of the pre-charging resistor or embedded in the bus capacitor insulation layer.

[0084] In the embodiment, the main relay and the pre-charging relay are contactors.

[0085] The third object of the present application is to provide an electronic device, comprising a memory and a processor, the memory is used for saving a computer program, and the processor is used for executing the computer program to realize the smart plug-in safety control method for mobile energy storage device.

[0086] The fourth object of the present application is to provide a computer readable storage medium, used for saving a computer program, and the computer program is executed by a processor to realize the smart plug-in safety control method for mobile energy storage device.

[0087] The above-mentioned embodiments are only the preferred embodiments of the present application, and cannot be used to limit the protection scope of the present application, and any non-essential changes and replacements made by the person skilled in the art on the basis of the present application shall fall within the protection scope of the present application.

Claims

1. A method for intelligent plug-in / plug-out safety control of mobile energy storage devices, characterized in that: Includes the following steps: S1: When the smart card is brought close to the smart plug-in connector, contactless identification is completed through the NFC module. The control unit receives the information from the smart card and controls the limit structure used to limit the smart plug-in connector to unlock, and removes the smart plug-in connector from the limit structure. S2: The smart plug-in connector is connected to the interface of the mobile energy storage device. At the same time, the sensor on the smart plug-in connector identifies the distance between the contact point of the smart plug-in connector and the contact point of the interface of the mobile energy storage device, and transmits the distance information to the control unit on the smart plug-in connector. When the control unit receives the distance information detected by the sensor and it is less than a preset threshold, the control unit controls the second electromagnetic lock to lock, and the smart plug-in connector is connected to the mobile energy storage device. Then, the mechanical lock is manually operated to connect the smart plug-in connector to the mobile energy storage device again. S3: The control unit dynamically adjusts the pre-charge current flowing through the bus pre-charge circuit. The mobile energy storage device pre-charges the bus through the bus pre-charge circuit. When the control unit receives a voltage difference between the bus and the load that is less than a preset threshold, the control unit controls the main relay to close and the pre-charge relay to open, and the intelligent plug-in connector is officially energized and put into operation.

2. The intelligent plug-in safety control method for mobile energy storage devices according to claim 1, characterized in that: S2 also includes the following steps: S21: When the smart plug-in connector approaches the protective shell of the mobile energy storage device interface, it completes contactless identification via the NFC module. The protective shell of the mobile energy storage device interface opens, and the smart plug-in connector connects to the interface of the mobile energy storage device. The display module on the smart plug-in connector, which is used to display the open and closed status of the second electromagnetic lock, displays a red light. S22: The Hall displacement sensor on the smart plug-in connector collects the distance between the smart plug-in connector contact point and the mobile energy storage device interface contact point at a sampling frequency of 1kHz per second, and transmits the distance information to the control unit on the smart plug-in connector. S23: When the control unit receives the distance information detected by the Hall displacement sensor, which is less than the preset threshold, the control unit controls the second electromagnetic lock to lock. At the same time, the control unit controls the display module on the smart plug-in connector to display a green light, and the smart plug-in connector is connected to the mobile energy storage device. S24: Manually operate the mechanical lock again to reconnect the smart plug-in connector to the mobile energy storage device.

3. The intelligent plug-in safety control method for mobile energy storage devices according to claim 1, characterized in that: S3 also includes the following steps: S31: The storage module on the smart pluggable connector transmits pluggable life information and historical pluggable over-temperature / over-current alarm information to the control unit; the NTC thermistor on the bus pre-charge circuit transmits the collected temperature information to the control unit; the bus voltage sensor transmits the collected bus voltage value to the control unit; and the load input voltage sensor transmits the collected load voltage value to the control unit. S32: When the control unit receives the insertion and removal life information of the storage module which is greater than the preset threshold and / or the historical insertion and removal over-temperature / over-current alarm information, the control unit closes the pre-charge relay on the branch pre-charge circuit with a large control resistor value, and forces the use of low current long-term pre-charge. When the temperature information received by the control unit from the NTC thermistor is greater than the preset threshold, the control unit controls the precharge relay on the precharge circuit with a large resistance value to close, thereby reducing the precharge current flowing through the bus and realizing automatic derating precharge. When the control unit receives a voltage difference between the bus voltage sensor and the load input voltage sensor that is greater than a preset threshold, the control unit controls the precharge relay on the precharge circuit of the branch with a large resistance value to close. Every 50 to 100 ms, the control unit adjusts the closing and opening of the precharge relay on different branch precharge circuits according to the voltage difference, switching step by step and gradually increasing the current to achieve precharge soft start. S33: Mobile energy storage devices precharge the bus via the bus precharge circuit; S34: When the control unit receives a voltage difference between the bus voltage sensor and the load input voltage sensor that is less than a preset threshold, the control unit controls the main relay to close and the pre-charge relay to open, and the intelligent plug-in connection is officially energized for operation.

4. The intelligent plug-in safety control method for mobile energy storage devices according to claim 3, characterized in that: The insertion and removal life of S31 is evaluated by contact temperature and pre-charge current, as shown in formulas (1), (2), and (3). In formula (1), L used The lifetime consumption integral value for this insertion / removal is given, where N is the total number of samplings during the pre-charge phase, and ΔT is the value of the insertion / removal. i Let I be the temperature rise value of the i-th sample. i Let be the pre-charge current for the i-th sample, and Δt be the time interval between each sample. In formula (2), L std The standard is the single-use point value. In formula (3), N o The number of times the design service life is used.

5. An intelligent plug-in safety device for mobile energy storage devices, characterized in that: The device includes a smart card and a smart plug-in connector, a first NFC tag module set in the smart card, a limiting structure set in the mobile energy storage device, a second NFC tag module set on the interface protective shell of the mobile energy storage device, and an NFC read / write module set in the smart plug-in connector. The smart card and smart plug-in connector complete contactless identification through the first NFC tag module and NFC read / write module, which is used to remove the smart plug-in connector from the limiting structure. The smart plug-in connector and the protective shell for the mobile energy storage device interface complete contactless identification through an NFC read / write module and a second NFC tag module, which allows the smart plug-in connector to be inserted into the interface of the mobile energy storage device.

6. An electronic device, characterized in that: It includes a memory and a processor, the memory being used to store computer programs and the processor being used to execute computer programs to implement the intelligent plug-in safety control method for mobile energy storage devices as described in any one of claims 1-4.

7. A computer-readable storage medium, characterized in that: Used to store a computer program, which, when executed by a processor, implements the intelligent plug-in safety control method for mobile energy storage devices as described in any one of claims 1-4.

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