A power supplementing system, an electric crane and a control method

Abstract

The application discloses a power supplementing system, an electric hoist and a control method, and relates to the technical field of electric hoists.

Description

Technical Field

[0001] This invention relates to the field of new energy technology, and in particular discloses a power supply system, an electric crane, and a control method. Background Technology

[0002] Currently, common electric crane power supply systems include Figure 1 As shown, it mainly consists of battery modules, a battery management system (BMS), an on-board charger (OBC), a vehicle control unit (VCU), and a motor. Its working principle is as follows: After the charger is powered on, it supplies power to the battery modules under the control of the battery management system. When the battery modules reach the set charge level, the battery management system cuts off the power supply, completing the recharging process. When the motor or the vehicle's low-voltage power supply requires power, the battery modules, under the control of the battery management system, supply power to the vehicle controller, which then supplies power to the motor and other low-voltage components of the vehicle.

[0003] Existing electric crane power replenishment systems have the following technical drawbacks: Current electric cranes generally only use plug-in charging, resulting in a limited power replenishment method. In field operations, it is often difficult to obtain additional power sources, and the equipment faces a high risk of breakdown when the battery module is low on power or depleted.

[0004] Therefore, the limited range of existing electric cranes due to their single power replenishment method is a technical problem that urgently needs to be solved. Summary of the Invention

[0005] This invention provides a power replenishment system, an electric crane, and a control method, aiming to solve the technical problem of limited driving range caused by the current single power replenishment method for electric cranes.

[0006] One aspect of the present invention relates to a charging system, including a battery management system, a vehicle controller, a motor module, and a battery module. The charging system further includes a charging module. The battery management system includes a first controller and a first relay switch, a second relay switch, a third relay switch, a current sensor, a low-voltage I / O port, and a BMS wake-up switch connected to the first controller. The charging module includes a charger and a fourth relay switch, a fifth relay switch, a cable reel, a diesel generator set, a sixth relay switch, and a mains connector connected to the charger. The vehicle controller includes a second controller and a seventh relay switch, an eighth relay switch, and a battery pack connected to the second controller. The first controller is connected to the second controller, the charger, and the battery module. The second controller is connected to the first controller and the motor module.

[0007] Furthermore, the battery module is connected to the first, second, third, and fourth pins of the first controller, the fifth pin of the first controller is connected to the first pin of the second controller, the sixth pin of the first controller is connected to port a of the charger, the seventh pin of the first controller is connected to port b of the charger, the eighth pin of the first controller is connected to the second pin of the second controller, and the ninth pin of the first controller is connected to the BMS wake-up switch. When the BMS wake-up switch is powered on, the first controller is woken up, and the battery management system is in a pre-charging state. When the fourth relay switch is powered on and closed, the charger is in a wake-up state.

[0008] Furthermore, when using mains power for supplementary power, the mains power connector is connected to the mains power, the first relay switch, the second relay switch, and the fifth relay switch are energized and closed, the third relay switch is opened, and the mains power current flows through the cable reel, the charger's port A, the first pin of the first controller, and the battery module to charge the battery module. The mains power current continues to flow through the battery module, the first controller's fourth pin, the current sensor, the charger's port B, and the cable reel to form a charging circuit.

[0009] Furthermore, when a diesel generator set is used for supplemental power, the first, second, and fifth relay switches are energized and closed, the third relay switch is opened, and the sixth relay switch is energized to start the diesel generator set. The current flows through port a of the charger, the first pin of the first controller, and the battery module to charge the battery module. The current continues to flow through the battery module, the fourth pin of the first controller, the current sensor, port b of the charger, and the diesel generator set to form a charging circuit.

[0010] Furthermore, when the battery pack needs to be recharged, the first and second relay switches are de-energized and disconnected, the third relay switch is closed, and the power supply and distribution function is activated through the vehicle controller. The seventh relay switch is energized and closed, and the eighth relay switch is de-energized and disconnected, and the battery pack is charged through the vehicle controller.

[0011] Furthermore, when the motor module is in operation, the first relay switch and the second relay switch are de-energized and disconnected, and the third relay switch is closed. The drive current flows through the battery module, the first pin of the first controller, the fifth pin of the first controller, and the first pin of the first controller, and then connects to the motor module to drive the motor module to drive the load. At the same time, the current flows through the second pin of the second controller, the eighth pin of the first controller, and the fourth pin of the second controller to the battery module, forming a drive circuit.

[0012] Another aspect of the present invention relates to an electric crane, including the aforementioned power supply system, the electric crane also including a crane body, the power supply system being installed at the front end of the crane body.

[0013] Another aspect of the present invention relates to a control method for an electric crane, applied to the aforementioned power supply system. The control method for the electric crane includes the following steps: Get the current battery module's power level; Determine whether the current battery level of the battery module is less than the first lower limit set charging threshold α1; If the current battery module charge is detected to be less than the first lower limit set charging threshold α1, the battery module charging process will be initiated. Determine whether to use the mains power supplement mode; If the mains power replenishment mode is detected, the BMS wake-up switch is energized, the first controller is awakened, and the battery management system is in a pre-charging state; the fourth relay switch is energized and closed, and the charger is awakened. The first, second, and fifth relay switches are energized and closed, while the third relay switch is open. The mains current flows through the cable reel, port A of the charger, the first pin of the first controller, and the battery module to charge the battery module. If the battery module is found to be fully charged, the process ends.

[0014] Furthermore, after determining whether the current battery module charge is less than the first lower limit set charging threshold α1, the process also includes: If the current battery module charge is detected to be greater than the first lower limit set charging threshold α1, then no battery module charging is required. Get the current battery level of the battery pack; Determine whether the current battery charge is less than the second lower limit set charging threshold α2; If it is detected that the current battery charge is less than the second lower limit set charging threshold α2, then the BMS and vehicle controller will be woken up. The first and second relay switches are de-energized and open, the third relay switch is closed, and the power supply and distribution function is activated through the vehicle controller. The seventh relay switch is energized and closes, and the eighth relay switch is de-energized and opens, and the battery is charged through the vehicle controller. If the battery pack is found to be fully charged, the process ends.

[0015] Furthermore, after determining whether to adopt the mains power supplementation mode, the following steps are also included: If it is detected that the mains power supply mode is not being used, then the diesel generator set power supply mode will be used. When the BMS wake-up switch is energized, the first controller is awakened and the battery management system is in a pre-charging state; when the fourth relay switch is energized and closed, the charger is awakened. When the first, second, fifth, and sixth relay switches are energized and closed, and the third relay switch is opened, the diesel generator set charges the battery module. If the battery module is found to be fully charged, the process ends.

[0016] The beneficial effects achieved by this invention are as follows: This invention provides a charging system, an electric crane, and a control method. The charging system comprises a battery management system, a vehicle controller, a motor module, a battery module, and a charging module. The battery management system comprises a first controller and a first relay switch, a second relay switch, a third relay switch, a current sensor, a low-voltage I / O port, and a BMS wake-up switch connected to the first controller. The charging module comprises a charger and a fourth relay switch, a fifth relay switch, a cable reel, a diesel generator set, a sixth relay switch, and a mains power connector connected to the charger. The vehicle controller comprises a second controller and a seventh relay switch, an eighth relay switch, and a battery pack connected to the second controller. The first controller is connected to the second controller, the charger, and the battery module. The second controller is connected to the first controller and the motor module. The power replenishment system, electric crane, and control method provided by this invention are compatible with both mains direct charging and diesel power replenishment modes. When a mains power source is available, the electric crane can be directly powered by the mains power. When it is difficult to obtain a mains power source in the field, a diesel generator is used for power replenishment, avoiding the risk of breakdown due to insufficient battery power or depletion. The power replenishment system of this invention automatically controls power replenishment, resulting in high power replenishment efficiency. Attached Figure Description

[0017] Figure 1 Functional block diagram of a supplementary system for existing electric cranes; Figure 2 This is a schematic diagram of the power supply system of the present invention; Figure 3 This is a schematic diagram of the electric crane structure of the present invention; Figure 4 This is a control flowchart of the electric crane power replenishment system of the present invention.

[0018] Explanation of icon numbers: 201. Crane body; 202. Power supply system; 300. Battery management system; 400. Power supply module; 500. Vehicle controller; 600. Motor module; 700. Battery module; 301. First relay switch; 302. Second relay switch; 303. Third relay switch; 304. Current sensor; 305. Low-voltage I / O port; 306. BMS wake-up switch; 401. Fourth relay switch; 402. Fifth relay switch; 403. Cable reel; 404. Charger; 405. Diesel generator set; 406. Sixth relay switch; 407. Mains connector; 501. Seventh relay switch; 502. Eighth relay switch; 503. Battery pack. Detailed Implementation

[0019] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0020] like Figure 2 As shown, the first embodiment of the present invention proposes a charging system, including a battery management system 300, a vehicle controller 500, a motor module 600, and a battery module 700. The charging system also includes a charging module 400. The battery management system 300 includes a first controller and a first relay switch 301, a second relay switch 302, a third relay switch 303, a current sensor 304, a low-voltage I / O port 305, and a BMS wake-up switch 306 connected to the first controller. The charging module 400 includes a charger 404 and a fourth relay switch 401, a fifth relay switch 402, a cable reel 403, a diesel generator set 405, a sixth relay switch 406, and a mains connector 407 connected to the charger 404. The vehicle controller 500 includes a second controller and a seventh relay switch 501, an eighth relay switch 502, and a battery pack 503 connected to the second controller. The first controller is connected to the second controller, the charger 404, and the battery module 700 respectively; the second controller is connected to the first controller and the motor module 600 respectively.

[0021] In the above structure, please see Figure 2 and Figure 3 In this embodiment, the battery module 700 is connected to the first, second, third, and fourth pins of the first controller; the fifth pin of the first controller is connected to the first pin of the second controller; the sixth pin of the first controller is connected to port a of the charger 404; the seventh pin of the first controller is connected to port b of the charger 404; the eighth pin of the first controller is connected to the second pin of the second controller; and the ninth pin of the first controller is connected to the BMS wake-up switch 306. In this embodiment, there are two charging modes: external AC power charging and diesel generator set charging. When the charging system is charging, either external AC power charging or diesel generator set charging can be selected. In this embodiment, when the BMS wake-up switch 306 is energized, the first controller is woken up, and the battery management system 300 is in a pre-charging state; when the fourth relay switch 401 is energized and closed, the charger 404 is in a wake-up state.

[0022] Further, see Figure 2 and Figure 3The power replenishment system provided in this embodiment, when using mains power for replenishment, connects the mains power connector 407 to the mains power supply. The first relay switch 301, the second relay switch 302, and the fifth relay switch 402 are energized and closed, while the third relay switch 303 is open. The mains current flows through the cable reel 403, port a of the charger 404, the first pin of the first controller, and the battery module 700 to charge the battery module 700. The mains current continues to flow through the battery module 700, the fourth pin of the first controller, the current sensor 304, port b of the charger 404, and the cable reel 403 to form a charging circuit. The power replenishment system provided in this embodiment features automatic power replenishment control and high efficiency in power replenishment operations.

[0023] Preferably, please see Figure 2 and Figure 3 In the power replenishment system provided in this embodiment, when a diesel generator set 405 is used for power replenishment, the first relay switch 301, the second relay switch 302, and the fifth relay switch 402 are energized and closed, the third relay switch 303 is opened, and the sixth relay switch 406 is energized to start the diesel generator set 405. Current flows through port a of the charger 404, the first pin of the first controller, and the battery module 700 to charge the battery module 700. The current continues to flow through the battery module 700, the fourth pin of the first controller, the current sensor 304, port b of the charger 404, and the diesel generator set 405 to form a charging circuit. The power replenishment system provided in this embodiment features automatic power replenishment control and high efficiency in power replenishment operations.

[0024] Further, see Figure 2 and Figure 3 In the charging system provided in this embodiment, when the battery pack 503 needs charging, the first relay switch 301 and the second relay switch 302 are de-energized and open, the third relay switch 303 is closed, and the power supply and distribution function is activated through the vehicle controller 500. The seventh relay switch 501 is energized and closes, and the eighth relay switch 502 is de-energized and opens, charging the battery pack 503 through the vehicle controller 500. The charging system provided in this embodiment automatically controls the charging process and has high charging efficiency.

[0025] Preferably, please see Figure 2 and Figure 3The power replenishment system provided in this embodiment operates as follows: when the motor module 600 is in operation, the first relay switch 301 and the second relay switch 302 are de-energized and disconnected, while the third relay switch 303 is closed. The drive current flows through the battery module 700, the first pin of the first controller, the fifth pin of the battery controller, and the first pin of the second controller, then connects to the motor module 600, driving the motor module 600 to move the load. Simultaneously, the current flows through the second pin of the second controller, the eighth pin of the first controller, and the fourth pin of the second controller before returning to the battery module 700, forming a drive circuit. The power replenishment system provided in this embodiment automatically controls power replenishment, resulting in high efficiency.

[0026] Another aspect of the present invention relates to an electric crane, including the aforementioned power supply system 202. The electric crane also includes a crane body 201, and the power supply system 202 is installed at the front end of the crane body 201.

[0027] like Figure 4 As shown. This invention provides a control method for an electric crane, applied to the aforementioned power supply system 202. The control method for the electric crane includes the following steps: Step S100: Obtain the current battery module's power level.

[0028] Step S200: Determine whether the current battery module charge is less than the first lower limit set charging threshold α1.

[0029] Step S300: If it is detected that the current battery module power is less than the first lower limit set charging threshold α1, then the battery module charging process is entered.

[0030] Step S400: Determine whether to use the mains power supplement mode.

[0031] Step S500: If the mains power replenishment mode is detected, the BMS wake-up switch is energized, the first controller is woken up, and the battery management system is in pre-charging state; the fourth relay switch is energized and closed, and the charger is woken up.

[0032] In step S600, the first relay switch, the second relay switch, and the fifth relay switch are energized and closed, and the third relay switch is opened. The mains current flows through the cable reel, the charger's port a, the first pin of the first controller, and the battery module to charge the battery module.

[0033] Step S700: If it is detected that the battery module is fully charged, then the process ends.

[0034] Furthermore, in the control method for the electric crane provided in this embodiment, step S200 further includes: Step S210: If it is detected that the current battery module power is greater than the lower limit set charging threshold α1, then there is no need to charge the battery module.

[0035] Step S220: Obtain the current battery level of the battery pack.

[0036] Step S230: Determine whether the current battery charge is less than the second lower limit set charging threshold α2.

[0037] Step S240: If it is detected that the current battery power is less than the second lower limit set charging threshold α2, then wake up the BMS and the vehicle controller.

[0038] In step S250, the first and second relay switches are de-energized and open, the third relay switch is closed, the power supply and distribution function is activated through the vehicle controller, the seventh relay switch is energized and closes, the eighth relay switch is de-energized and opens, and the battery is charged through the vehicle controller.

[0039] Step S260: If it is detected that the current battery pack is fully charged, then the process ends.

[0040] Preferably, the control method for the electric crane provided in this embodiment further includes the following after step S400: Step S410: If it is detected that the mains power supply mode is not used, then the diesel generator set power supply mode is used.

[0041] In step S420, the BMS wake-up switch is energized, the first controller is awakened, and the battery management system is in pre-charging state; the fourth relay switch is energized and closed, and the charger is awakened.

[0042] In step S430, the first relay switch, the second relay switch, the fifth relay switch, and the sixth relay switch are energized and closed, while the third relay switch is opened, and the diesel generator set charges the battery module.

[0043] Step S440: If it is detected that the battery module is fully charged, then the process ends.

[0044] like Figures 2 to 4 As shown in the figure, the working principle of the power supply system, electric crane and control method provided in this embodiment is as follows: Please see Figure 3 The electric crane includes a crane body 201 and a power supply system 202, with the power supply system 202 installed at the front end of the crane body 201.

[0045] See Figure 2The charging system 202 mainly consists of a battery management system (BMS) 300, a charging module 400, a vehicle controller 500, a motor module 600, and a battery module 700. The BMS 300 includes a first relay switch 301, a second relay switch 302, a third relay switch 303, a current sensor 304, a low-voltage I / O port 305, and a BMS wake-up switch 306. The charging module 400 includes a fourth relay switch 401, a fifth relay switch 402, a cable reel 403, a charger 404, a diesel generator set 405, a sixth relay switch 406, and a mains connector 407. The vehicle controller 500 includes a seventh relay switch 501, an eighth relay switch 502, and a battery pack 503.

[0046] like Figure 2 As shown, the working principle of the electric crane's power replenishment is as follows: After the BMS wake-up switch 306 is energized, the battery management system (BMS) 300 is awakened, and the battery management system 300 is in a pre-charging state. After the fourth relay switch 401 is energized and closed, the charger 404 is in an awakened state. The charging mode can be selected from external mains power or from diesel generator set for power replenishment. ① When using mains power for supplementary power, the mains power connector 407 is connected to the mains power. The first relay switch 301, the second relay switch 302, and the fifth relay switch 402 are energized and closed, while the third relay switch 303 is opened. The mains power current supplements the battery module 700 through the cable reel 403, the a port of the charger 404, the first pin PIN1 of the battery management system (BMS) 300, and the high-voltage pin X1+ of the battery module 700. The current continues to form a charging circuit through the high-voltage pin X3- of the battery module 700, the fourth pin PIN4 of the battery management system (BMS) 300, the current sensor 304, the b port of the charger 404, and the cable reel 403. ② When a diesel generator set is used for power supplementation, the first relay switch 301, the second relay switch 302, and the fifth relay switch 402 are energized and closed, the third relay switch 303 is opened, and the sixth relay switch 406 is energized to start the diesel generator set 405. The current supplements the battery module 700 through the a port of the charger 404, the first pin PIN1 of the battery management system (BMS) 300, and the high-voltage pin X1+ of the battery module 700. The current continues to form a charging circuit through the high-voltage pin X3- of the battery module 700, the PIN4 of the battery management system (BMS) 300, the current sensor 304, the b port of the charger 404, and the diesel generator set 405.

[0047] like Figure 2As shown, ① When the battery pack 503 needs additional power, the first relay switch 301 and the second relay switch 302 are de-energized and open, while the third relay switch 303 closes. The power supply and distribution function is activated through the F2 port of the vehicle controller 500. The seventh relay switch 501 is energized and closes, while the eighth relay switch 502 is de-energized and opens. The battery 503 is charged through the DC+ port of the vehicle controller 500. ② When the motor module 600 is operating, the first relay switch 301 and the second relay switch 302 are de-energized and open, while the third relay switch 303 closes. The drive current flows through the high-voltage pin X1+ of the battery module 700, the first pin PIN1 of the battery management system (BMS) 300, the PIN5 of the battery management system (BMS) 300, and the first pin PIN1 of the vehicle controller 500, and then connects to the motor module 600 to drive the motor and drive the load. At the same time, the current flows through the second pin PIN2 of the vehicle controller 500, the eighth pin PIN8 of the battery management system (BMS) 300, the fourth pin PIN4 of the battery management system (BMS) 300, and the high-voltage pin D3 of the battery module 700 to the battery module 700, forming a drive circuit.

[0048] Compared with the prior art, the charging system, electric crane, and control method provided in this embodiment employ a battery management system, a vehicle controller, a motor module, a battery module, and a charging module. The battery management system includes a first controller and a first relay switch, a second relay switch, a third relay switch, a current sensor, a low-voltage I / O port, and a BMS wake-up switch connected to the first controller. The charging module includes a charger and a fourth relay switch, a fifth relay switch, a cable reel, a diesel generator set, a sixth relay switch, and a mains power connector connected to the charger. The vehicle controller includes a second controller and a seventh relay switch, an eighth relay switch, and a battery pack connected to the second controller. The first controller is connected to the second controller, the charger, and the battery module. The second controller is connected to the first controller and the motor module. The power replenishment system, electric crane, and control method provided in this embodiment are compatible with both mains power direct charging and diesel power replenishment modes. When a mains power source is available, the electric crane can be directly powered by the mains power. When it is difficult to obtain a mains power source in the field, a diesel generator is used for power replenishment to avoid the risk of breakdown due to insufficient battery module power or depletion. The power replenishment is automatically controlled, resulting in high efficiency of power replenishment operations.

[0049] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention. Clearly, those skilled in the art can make various alterations and modifications to the invention without departing from its spirit and scope. Thus, if these modifications and modifications of the invention fall within the scope of the claims and their equivalents, the invention is also intended to include these modifications and modifications.

Claims

1. A charging system, comprising a battery management system (300), a vehicle controller (500), a motor module (600), and a battery module (700), characterized in that, The charging system further includes a charging module (400). The battery management system (300) includes a first controller and a first relay switch (301), a second relay switch (302), a third relay switch (303), a current sensor (304), a low-voltage I / O port (305), and a BMS wake-up switch (306) connected to the first controller. The charging module (400) includes a charger (404) and a fourth relay switch (401) and a fifth relay switch (402) connected to the charger (404). The system includes a cable reel (403), a diesel generator set (405), a sixth relay switch (406), and a mains power connector (407). The vehicle controller (500) includes a second controller and a seventh relay switch (501), an eighth relay switch (502), and a battery pack (503) connected to the second controller. The first controller is connected to the second controller, the charger (404), and the battery module (700) respectively. The second controller is connected to the first controller and the motor module (600) respectively. The battery module (700) is connected to the first, second, third, and fourth pins of the first controller, the fifth pin of the first controller is connected to the first pin of the second controller, the sixth pin of the first controller is connected to port a of the charger (404), the seventh pin of the first controller is connected to port b of the charger (404), the eighth pin of the first controller is connected to the second pin of the second controller, and the ninth pin of the first controller is connected to the BMS wake-up switch (306). When the BMS wake-up switch (306) is powered on, the first controller is woken up, and the battery management system (300) is in a pre-charging state. When the fourth relay switch (401) is powered on and closed, the charger (404) is in a wake-up state. When mains power is used for supplemental power, the mains connector (407) is connected to the mains power, the first relay switch (301), the second relay switch (302), and the fifth relay switch (402) are energized and closed, the third relay switch (303) is opened, and the mains current flows through the cable reel (403), the a port of the charger (404), the first pin of the first controller, and the battery module (700) to charge the battery module (700). The mains current continues to flow through the battery module (700), the fourth pin of the first controller, the current sensor (304), the b port of the charger (404), and the cable reel (403) to form a charging circuit. When the diesel generator set (405) is used for power replenishment, the first relay switch (301), the second relay switch (302) and the fifth relay switch (402) are energized and closed, the third relay switch (303) is opened, and the sixth relay switch (406) is energized to start the diesel generator set (405). The current flows through port a of the charger (404), the first pin of the first controller and the battery module (700) to charge the battery module (700). The current continues to flow through the battery module (700), the fourth pin of the first controller, the current sensor (304), port b of the charger (404) and the diesel generator set (405) to form a charging circuit.

2. The power replenishment system as described in claim 1, characterized in that, When the battery pack (503) needs to be recharged, the first relay switch (301) and the second relay switch (302) are de-energized and disconnected, the third relay switch (303) is closed, the power supply and distribution function is activated through the vehicle controller (500), the seventh relay switch (501) is energized and closed, the eighth relay switch (502) is de-energized and disconnected, and the battery pack (503) is charged through the vehicle controller (500).

3. The power replenishment system as described in claim 2, characterized in that, When the motor module (600) is in operation, the first relay switch (301) and the second relay switch (302) are de-energized and disconnected, and the third relay switch (303) is closed. The driving current flows through the battery module (700), the first pin of the first controller, the fifth pin of the first controller, and the first pin of the first controller, and then connects to the motor module (600) to drive the motor module (600) to drive the load. At the same time, the current flows through the second pin of the second controller, the eighth pin of the first controller, and the fourth pin of the second controller to the battery module (700), forming a drive circuit.

4. An electric crane, comprising a power supply system (202) as described in any one of claims 1 to 3, characterized in that, The electric crane also includes a crane body (201), and the power supply system (202) is installed at the front end of the crane body (201).

5. A control method for an electric crane, applied in the power supply system (202) as described in any one of claims 1 to 4, characterized in that, The control method for the electric crane includes the following steps: Get the current battery module's power level; Determine whether the current battery level of the battery module is less than the first lower limit set charging threshold α1; If the current battery module charge is detected to be less than the first lower limit set charging threshold α1, the battery module charging process will be initiated. Determine whether to use the mains power supplement mode; If the mains power replenishment mode is detected, the BMS wake-up switch is energized, the first controller is awakened, and the battery management system is in a pre-charging state; the fourth relay switch is energized and closed, and the charger is awakened. The first, second, and fifth relay switches are energized and closed, while the third relay switch is open. The mains current flows through the cable reel, port A of the charger, the first pin of the first controller, and the battery module to charge the battery module. If the battery module is found to be fully charged, the process ends.

6. The control method for an electric crane as described in claim 5, characterized in that, After the step of determining whether the current battery module charge is less than the first lower limit set charging threshold α1, the following is also included: If the current battery module charge is detected to be greater than the first lower limit set charging threshold α1, then no battery module charging is required. Get the current battery level of the battery pack; Determine whether the current battery charge is less than the second lower limit set charging threshold α2; If it is detected that the current battery charge is less than the second lower limit set charging threshold α2, then the BMS and vehicle controller will be woken up. The first and second relay switches are de-energized and open, the third relay switch is closed, and the power supply and distribution function is activated through the vehicle controller. The seventh relay switch is energized and closes, and the eighth relay switch is de-energized and opens, and the battery is charged through the vehicle controller. If the battery pack is found to be fully charged, the process ends.

7. The control method for an electric crane as described in claim 6, characterized in that, The step of determining whether to use the mains power supplement mode also includes: If it is detected that the mains power supply mode is not being used, then the diesel generator set power supply mode will be used. When the BMS wake-up switch is energized, the first controller is awakened and the battery management system is in a pre-charging state; when the fourth relay switch is energized and closed, the charger is awakened. When the first, second, fifth, and sixth relay switches are energized and closed, and the third relay switch is opened, the diesel generator set charges the battery module. If the battery module is found to be fully charged, the process ends.

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