Charging system and electric engineering machinery

Abstract

The present invention provides a charging system and electric engineering machinery, relating to the technical field of engineering machinery. The charging system includes a control device, a charging switch, a power supply device, a prompting device, and an onboard charger. The control device includes a constant power supply module. The charging switch has a first end and a second end, the first end being electrically connected to the constant power supply module, and the second end being electrically connected to the control device and / or the power supply device. The control device is electrically connected to the power supply device, and the power supply device is electrically connected to the prompting device and the onboard charger, respectively. The control device is configured to trigger the power supply device to supply power to the prompting device and the onboard charger, thereby activating the prompting device and the onboard charger. The onboard charger is configured to charge the electric engineering machinery. This improves charging efficiency and user experience.

Description

Technical Field

[0001] The present invention relates to the technical field of engineering machinery, and in particular to a charging system and an electric engineering machinery. Background Art

[0002] Currently, the use of new energy as a power source for construction machinery is becoming a growing trend in the industry. For example, cranes, as part of the construction machinery sector, are also moving towards electrification.

[0003] Existing electric engineering machinery generally uses power batteries as power sources during driving and operating conditions. When charging electric engineering machinery, non-national standard charging guns are generally used to charge the power batteries. However, non-national standard charging guns cannot directly interact with the on-board charger, which is inconvenient when charging. In addition, existing electric engineering machinery does not have a device to indicate the charging status, and operators cannot judge whether the engineering machinery is charging from the appearance. The above is due to the unreasonable structural layout of the charging system of existing electric engineering machinery, which reduces the user experience and charging efficiency. Summary of the Invention

[0004] The technical problem solved by the present invention is: how to optimize the structural layout design of the electric engineering machinery charging system to enhance the user experience.

[0005] The present invention provides a charging system for electric engineering machinery, the charging system including a control device, a charging switch, a power supply device, a prompting device and an on-board charger, the control device including a normal power supply module, the two ends of the charging switch are respectively a first end and a second end, the first end is electrically connected to the normal power supply module, the second end is electrically connected to the control device and / or the power supply device, the control device is electrically connected to the power supply device, the power supply device is respectively electrically connected to the prompting device and the on-board charger, the control device is used to trigger the power supply device to supply power to the prompting device and the on-board charger, so as to wake up the prompting device and the on-board charger, and the on-board charger is used to charge the electric engineering machinery.

[0006] Optionally, the power supply device includes a battery, a first relay and a power adapter electrically connected in sequence, the power adapter is electrically connected to the prompt device and the vehicle-mounted charger respectively, and the first relay is also electrically connected to the control device and / or the second end.

[0007] Optionally, the prompt device includes a meter, which is electrically connected to the power adapter and is used to be set in the cab of the electric engineering machinery.

[0008] Optionally, the prompt device includes an indicator light, and the power supply device further includes a second relay, the second relay is electrically connected to the indicator light and the power adapter, respectively, and the indicator light is used to be set on the side of the electric engineering machinery.

[0009] Optionally, the charging system further includes a first diode, which is electrically connected to the line between the indicator light and the second relay, and the anode of the first diode is electrically connected to the second relay, and the cathode of the first diode is electrically connected to the indicator light.

[0010] Optionally, the charging system further includes a fuse, which is electrically connected to the line between the battery and the first relay, the line between the power adapter and the prompt device, and the line between the power adapter and the on-board charger.

[0011] Optionally, the electric engineering machinery includes an ignition lock, and the control device also includes an ON gear port and a power control module. The normal power supply module and the ON gear port are respectively used to be electrically connected to the ignition lock, and the ignition lock is used to be connected to the line between the first end and the normal power supply module. The second end is electrically connected to the ON gear port for energizing the control device, and the power control module is electrically connected to the power supply device.

[0012] Optionally, the charging system further includes a second diode, which is electrically connected to the line between the second end and the ON port, and the anode of the second diode is electrically connected to the second end, and the cathode of the second diode is electrically connected to the ON port.

[0013] Optionally, the charging system further includes a third diode, which is electrically connected to the line between the second end and the power supply device, and the anode of the third diode is electrically connected to the second end, and the cathode of the third diode is electrically connected to the power supply device.

[0014] Compared with the prior art, the charging system provided by the present invention has the following technical effects:

[0015] The charging system provided by the present invention is provided with a control device, a charging switch, a power supply device, a prompting device and an on-board charger, and the first end of the charging switch is electrically connected to the normal power supply module of the control device, the second end of the charging switch is electrically connected to the control device and / or the power supply device, and is electrically connected to the prompting device and the on-board charger respectively through the power supply device. During use, when charging the power battery of an electric engineering machine, such as an electric crane, a non-national standard charging gun is inserted and the charging switch is pressed, that is, the charging switch is closed. At this time, the normal power supply module of the control device can provide a normal power signal in the control circuit at any time. In this way, the electrical signal from the normal power supply module passes through the charging switch, the control device and the power supply device in sequence, or passes through the charging switch and the power supply device in sequence, thereby forming a control loop that triggers the power supply device to supply power to the prompting device and the on-board charger, waking up the prompting device and the on-board charger to work, that is, the prompting device can prompt the operator of the charging status and wake up the on-board charger to charge the power battery. When charging is completed, the charging switch is pressed again, that is, the charging switch is disconnected, and the above-mentioned control loop is also disconnected. Through the structural layout design of the above-mentioned charging system, not only can electric construction machinery be quickly charged through non-national standard charging guns, but as charging progresses, the charging status can also be prompted to operators through a reminder device, thereby improving charging efficiency and user experience.

[0016] In addition, in order to solve the above problems, the present invention also provides an electric engineering machine, including the above charging system.

[0017] Compared with the prior art, the technical effects of the electric engineering machinery provided by the present invention are substantially the same as those of the above-mentioned charging system, and are not described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the circuit structure of the charging system according to an embodiment of the present invention Figure 1 ;

[0019] Figure 2 Schematic diagram of the circuit structure of the charging system according to an embodiment of the present invention Figure 2 .

[0020] Description of reference numerals:

[0021] 1-Control device, 11-Normal power supply module, 12-ON gear port, 13-Power control module, 14-Indicator light control module, 2-Charging switch, 3-Power supply device, 31-Battery, 32-First relay, 33-Power adapter, 34-Second relay, 4-Onboard charger, 41-Charger wake-up module, 51-Instrument, 511-Instrument wake-up module, 52-Indicator light, 6-First diode, 7-Second diode, 8-Third diode, 9-Fuse, 10-Ignition lock. DETAILED DESCRIPTION

[0022] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0023] It should be noted that in the description of the present disclosure, the directions or positional relationships indicated by terms such as "upper", "lower", "left", "right", "top", "bottom", "front", "back", "inside" and "outside" are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present disclosure. They do not indicate or imply that the device referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the scope of protection of the present disclosure. In addition, a coordinate system XYZ is set herein, wherein the positive direction of the X-axis represents the right direction, the reverse direction of the X-axis represents the left direction, the positive direction of the Y-axis represents the front direction, the reverse direction of the Y-axis represents the back direction, the positive direction of the Z-axis represents the upper direction, and the reverse direction of the Z-axis represents the lower direction.

[0024] Furthermore, although the present invention has been described in this disclosure with reference to specific embodiments, it should be understood that these embodiments are merely illustrative of the principles and applications of the present invention. It should be understood that many modifications may be made to the illustrative embodiments, and that other arrangements may be devised, without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that the various dependent claims and features described herein may be combined in ways other than those described in the original claims. It should also be understood that features described in conjunction with individual embodiments may be employed in conjunction with other described embodiments.

[0025] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0026] like Figure 1 and Figure 2 As shown, an embodiment of the present invention provides a charging system for electric engineering machinery, the charging system including a control device 1, a charging switch 2, a power supply device 3, a prompt device and an on-board charger 4, the control device 1 including a normal power supply module 11, the two ends of the charging switch 2 are respectively a first end and a second end, the first end is electrically connected to the normal power supply module 11, the second end is electrically connected to the control device 1 or the power supply device 3, the control device 1 is electrically connected to the power supply device 3, the power supply device 3 is respectively electrically connected to the prompt device and the on-board charger 4, the control device 1 is used to trigger the power supply device 3 to power the prompt device and the on-board charger 4 to wake up the prompt device and the on-board charger 4 to work, and the on-board charger 4 is used to charge the electric engineering machinery.

[0027] Specifically, the control device 1 can be an electric engineering machine, such as an electric crane's own BCM module, i.e., the crane's own controller, or the control device 1 provided in this embodiment can be integrated into the aforementioned controller. The constant power supply module 11 can be an ignition lock power supply. The constant power supply module 11 can provide an electrical signal to the charging switch 2 via the electric engineering machine's own ignition lock 10. This saves the structural design of circuit re-layout, saves costs, and improves efficiency. Furthermore, the prompt device can be, for example, an instrument 51, which can be an instrument in the cab of the electric engineering machine itself or integrated into the aforementioned instrument to provide a prompt. Of course, the prompt device can also be other devices, such as an indicator light 52, and the control device 1 can include an indicator light control module that controls the logic of turning the indicator light on and off, or controlling the brightness of the indicator light 52, to control the indicator light 52. The electrical signal output by the constant power supply module 11 passes through the charging switch 2 and then the control device 1, triggering the power supply device 3 to power the prompting device and the onboard charger 4. Alternatively, the charging switch 2 can be directly connected to the power supply device 3 to trigger the power supply device 3 to operate. It should be noted that the power supply device 3 can be triggered by the electrical signal to power the power supply device 3, and the control can be achieved by providing electrical components such as relays in the power supply device 3. The charging status is then indicated by the prompting device, and the onboard charger 4 is awakened to charge the power battery of the electric construction machinery.

[0028] In this embodiment, a control device 1, a charging switch 2, a power supply device 3, a prompting device and an on-board charger 4 are provided, and the first end of the charging switch 2 is electrically connected to the permanent power supply module 11 of the control device 1, the second end of the charging switch 2 is electrically connected to the control device 1 and / or the power supply device 3, and the power supply device 3 is electrically connected to the prompting device and the on-board charger 4 respectively. When in use, when charging the power battery of an electric engineering machine, such as an electric crane, a non-national standard charging gun is inserted and the charging switch 2 is pressed, that is, the charging switch 2 is closed. At this time, the permanent power supply module of the control device 1 is electrically connected to the power supply module 11 of the control device 1, and the second end of the charging switch 2 is electrically connected to the control device 1 and / or the power supply device 3. 11 can provide the normal power signal in the control circuit at any time. In this way, the electrical signal from the normal power supply module 11 passes through the charging switch 2, the control device 1 and the power supply device 3 in sequence, or passes through the charging switch 2 and the power supply device 3 in sequence, thereby forming a control loop that triggers the power supply device 3 to supply power to the prompt device and the on-board charger 4, waking up the prompt device and the on-board charger 4 to work, that is, the prompt device can prompt the operator of the charging status and wake up the on-board charger 4 to charge the power battery. When charging is completed, press the charging switch 2 again, that is, disconnect the charging switch 2, and the above control loop is also disconnected. Through the structural layout design of the above charging system, not only can electric engineering machinery be quickly charged through non-national standard charging guns, but also the charging status can be prompted to the operator through the prompt device during charging, thereby improving the charging efficiency and user experience.

[0029] It should be noted that the charging switch 2 is a non-self-resetting slow charging enable switch, for example, a rocker switch, which is turned on and off by pressing the charging switch. Of course, the charging switch 2 can also be a switch with other structural forms.

[0030] Alternatively, as Figure 1 and Figure 2 As shown, the power supply device 3 includes a battery 31, a first relay 32 and a power adapter 33 electrically connected in sequence, the power adapter 33 is electrically connected to the prompt device and the vehicle charger 4 respectively, and the first relay 32 is also electrically connected to the control device 1 and / or the second end.

[0031] Specifically, the battery 31 can be the power source of the electric engineering machinery itself. Of course, it can also be set up separately. The power adapter 33 is a terminal block for power conversion and can be connected to multiple electrical components. The first relay 32 can be electrically connected to the second end of the control device 1 or the charging switch 2, or to both at the same time, that is, the electrical signal of the control circuit can be transmitted to the first relay 32 through the charging switch 2 or the control device 1, or both at the same time, to close or open it, so as to control the battery 31 to power the power adapter 33, and then control the power supply to the prompt device and the on-board charger 4, so as to wake up the prompt device to give a prompt during charging, and the on-board charger to perform charging.

[0032] In this embodiment, the power supply device 3 is configured to include a battery 31, a first relay 32, and a power adapter 33 electrically connected in sequence, and the first relay 32 is electrically connected to the second end of the control device 1 and / or the charging switch 2, thereby achieving control of the switch of the first relay 32 by an electrical signal, that is, controlling the battery 31 to supply power to the power adapter 33, the prompt device, and the on-board charger 4, thereby facilitating power supply control, and the circuit layout structure is reasonably designed, easy to implement, and precise control.

[0033] Alternatively, as Figure 1 and Figure 2 As shown, the prompt device includes a meter 51, which is electrically connected to the power adapter 33, and the meter 51 is used to be set in the cab of the electric engineering machine.

[0034] Specifically, the instrument 51 can be the instrument display screen of the electric engineering machinery itself, or the instrument 51 can be set separately, and the instrument 51 can be integrated into the instrument of the electric engineering machinery itself. In addition, an instrument wake-up module 511 is set in the instrument 51, and the instrument wake-up module 511 is electrically connected to the power adapter 33. The instrument 51 is awakened by the instrument wake-up module 511 and prompts are given. Specifically, the charging status can be prompted and displayed in the form of text, pattern, color, light, etc. or a combination thereof.

[0035] In this embodiment, by setting the prompt device as an instrument 51 and setting the instrument 51 in the cab of the electric engineering machinery, it is more convenient to prompt the operator, and the charging status is intuitively prompted and displayed, which is convenient to use and improves the user experience.

[0036] Alternatively, as Figure 1 and Figure 2 As shown, the prompt device includes an indicator light 52, and the power supply device 3 also includes a second relay 34, which is electrically connected to the indicator light 52 and the power adapter 33 respectively, and the indicator light 52 is used to be set on the side of the electric engineering machinery.

[0037] Specifically, the prompt device includes two groups of indicator lights 52, which are respectively used to be set on the left and right sides of the electric engineering machinery, and can simultaneously prompt the charging status, which is more intuitive and convenient. After the electrical signal passes through the power adapter 33, the second relay 34 is closed, the current is conducted, and the indicator light 52 is lit, thereby prompting the charging status. In addition, the indicator light control module 14 can be set in the control device 1 to control the logic such as the on and off and color of the indicator light group, so as to enrich the prompt scheme of the charging status through the indicator light 52, thereby further improving the user experience.

[0038] In this embodiment, by setting the prompt device as an indicator light 52 and setting it on the side of the electric engineering machinery, it is more convenient for the workers under the vehicle to observe the charging status, and by setting the second relay 34 to control the indicator light 52, it is more reasonable and reliable.

[0039] It should be noted that the instrument 51 and the indicator light 52 that can serve as prompting devices can be provided simultaneously or separately, and both can provide prompts on the charging status of the electric engineering machinery.

[0040] Alternatively, as Figure 1 and Figure 2As shown, the charging system also includes a first diode 6, which is electrically connected to the line between the indicator light 52 and the second relay 34, and the positive electrode of the first diode 6 is electrically connected to the second relay 34, and the negative electrode of the first diode 6 is electrically connected to the indicator light 52.

[0041] Specifically, there are two groups of indicator lights 52, or two in number, and the first diode 6 is electrically connected to the line between the two groups or two indicator lights 52 and the second relay 34 to achieve unidirectional conduction of the circuit and control the on and off of the indicator lights 52, making the circuit structure safer and more reliable.

[0042] In this embodiment, a first diode 6 is provided on the line between the indicator light 52 and the second relay 34, and the positive pole of the first diode 6 is electrically connected to the second relay 34, and the negative pole is electrically connected to the indicator light 52, so as to realize unidirectional conduction of the electrical signal from the second relay 34 to the indicator light 52, thereby ensuring the overall safety and reliability.

[0043] Alternatively, as Figure 1 and Figure 2 As shown, the charging system also includes a fuse 9, which is electrically connected to the line between the battery 31 and the first relay 32, the line between the power adapter 33 and the prompt device, and the line between the power adapter 33 and the on-board charger 4.

[0044] Specifically, multiple fuses 9 are provided, one each in the circuit between the battery 31 and the first relay 32, the other in the circuit between the power adapter 33 and the meter 51, the other in the circuit between the power adapter 33 and the indicator light 52, and the other in the circuit between the power adapter 33 and the onboard charger 4. These fuses protect the aforementioned electrical components, preventing damage to the components caused by transient overcurrent in the circuit, further enhancing overall safety. The type of fuse 9 can be selected based on the power requirements of the electrical components in the circuit, as well as other operational requirements. For example, the fuse in the circuit between the battery 31 and the first relay 32 can be a 400A fuse. Other fuses can be selected based on the actual application environment.

[0045] In this embodiment, by providing a fuse 9 and arranging it on the above-mentioned circuit line, it plays a role in protecting the circuit and electrical components, thereby further improving the overall safety and reliability, and reducing the risk of damage to electrical components, thereby extending the overall service life.

[0046] Alternatively, as Figure 1As shown, the electric engineering machinery includes an ignition lock 10, and the control device 1 also includes an ON gear port 12 and a power control module 13. The normal power supply module 11 and the ON gear port 12 are respectively used to be electrically connected to the ignition lock 10, and the ignition lock 10 is used to be connected to the line between the first end and the normal power supply module 11, and the second end is electrically connected to the ON gear port 12 for energizing the control device 1, and the power control module 13 is electrically connected to the power supply device 3.

[0047] Specifically, the control device 1 is the controller of the electric engineering machinery itself, and the normal power supply module 11 is the ignition lock power supply. During normal operation of the electric engineering machinery, the ignition lock power supply provides normal power to its ignition lock 10. The control device 1 also includes an ACC gear port and a START gear port, which are electrically connected to the ignition lock 10 respectively. When the key is inserted into the ignition lock 10, the control device 1 can obtain ACC gear, ON gear and START gear signals. When in the ON gear, the control device 1 and the entire vehicle electrical components can be powered. In this embodiment, by providing an ON gear port 12 on the control device 1 and electrically connecting it to the charging switch 2, when the charging switch 2 is pressed to close it, the control device 1 is powered through the ON gear port, and then the power control module 13 is powered, thereby powering the power supply device 3 and triggering the power supply device 3 to power the prompt device and the on-board charger 4, thereby realizing the charging and prompt functions of this charging system.

[0048] In this embodiment, by combining the ignition lock 10 of the electric engineering machinery itself and its original circuit structure, the charging switch 2 is electrically connected to the ignition lock 10, and a normal power signal is obtained through the ignition lock 10. The ON port 12 of the control device 1 provides an electrical signal to the control device 1 and its power control module 13, thereby triggering the power supply device 3 to supply power to the prompt device and the on-board charger 4, so that the prompt device and the on-board charger 4 perform prompting and charging operations. Through the effective structure with the original circuit structure of the electric engineering machinery, not only the purpose of prompting and effective charging of the charging system is achieved, but also the cost of additional circuit layout design is saved. The design is reasonable and saves costs.

[0049] Alternatively, as Figure 1 As shown, the charging system also includes a second diode 7, which is electrically connected to the line between the second end and the ON port 12, and the anode of the second diode 7 is electrically connected to the second end, and the cathode of the second diode 7 is electrically connected to the ON port 12.

[0050] Specifically, the control device 1 also includes an ACC gear port, and is electrically connected to the second end of the charging switch 2. A fourth diode is also provided on the circuit connected thereto. The anode of the fourth diode is electrically connected to the second end of the charging switch 2, and the cathode is electrically connected to the ACC gear port. By providing the second diode 7 and the fourth diode, unidirectional conduction of the circuit is achieved, so that the control device 1 is powered on according to the control logic, thereby ensuring the rationality of the control circuit.

[0051] In this embodiment, by providing a second diode 7 on the line between the second end of the charging switch 2 and the ON gear port 12, with the positive electrode of the second diode 7 electrically connected to the second end and the negative electrode electrically connected to the ON gear port 12, a unidirectional conduction of the line from the charging switch 2 to the control device 1 is achieved, thereby ensuring the reliability and rationality of the circuit.

[0052] Alternatively, as Figure 2 As shown, the charging system also includes a third diode 8, which is electrically connected to the line between the second end and the power supply device 3, and the positive electrode of the third diode 8 is electrically connected to the second end, and the negative electrode of the third diode 8 is electrically connected to the power supply device 3.

[0053] Specifically, the positive electrode of the third diode 8 is electrically connected to the second end of the charging switch 2, and the negative electrode is connected to the line between the power control module 13 of the control device 1 and the first relay 32 of the power supply device 3. That is, by setting the third diode 8, a one-way conduction from the charging switch to the power control module 13 of the power supply device 3 and / or the first relay 32 of the power supply device 3 is realized, and the opening and closing of the first relay 32 is controlled by an electrical signal. That is, the power control module 13 is not given an electrical signal through the ON port 12 of the control device 1 mentioned above, and the electrical signal can be directly transmitted to the power control module 13 through the charging switch 2, or directly transmitted to the first relay 32 and opened and closed, thereby controlling the power supply of the power supply device 3 to the prompt device and the on-board charger 4, and also realizing the effective charging and prompt functions of the charging system.

[0054] In this embodiment, by providing the third diode 8, unidirectional conduction from the charging switch 2 to the power supply device 3 is achieved, thereby realizing the control of whether the power supply device 3 supplies power to the prompt device and the on-board charger 4 by the electrical signal, and the circuit structure is more reasonable and reliable.

[0055] In addition, another embodiment of the present invention provides an electric engineering machine including the above-mentioned charging system.

[0056] In this embodiment, by providing the charging system in the electric engineering machinery, the technical effects achieved are substantially the same as those of the charging system in the above-mentioned embodiment, and details thereof will not be repeated here.

[0057] Exemplarily, the electric construction machinery is an electric crane, which includes a charging socket and a power battery. The non-national standard charging gun is inserted into the charging socket, and the charging switch 2 of the above-mentioned charging system is pressed. After the charging switch 2 is closed, the power battery is charged through the above-mentioned charging system, and a prompt is given through the prompt device of the charging system.

[0058] It should be noted that the above-mentioned electric engineering machinery may be pure electric engineering machinery, or hybrid engineering machinery, etc., that is, as long as the engineering machinery includes a power battery and requires a non-national standard charging gun to charge it, it is within the scope of protection of the present invention.

[0059] Although the present disclosure is disclosed as above, the protection scope of the present disclosure is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present disclosure, and these changes and modifications will fall within the protection scope of the present invention.

Claims

1. A charging system for electric engineering machinery, characterized in that: The charging system comprises a control device (1), a charging switch (2), a power supply device (3), a prompting device and an on-board charger (4), wherein the control device (1) comprises a normal power supply module (11), and the two ends of the charging switch (2) are respectively a first end and a second end, wherein the first end is electrically connected to the normal power supply module (11), and the second end is electrically connected to the control device (1) and / or the power supply device (3), wherein the control device (1) is electrically connected to the power supply device (3), and the power supply device (3) is electrically connected to the prompting device and the on-board charger (4), respectively. The control device (1) is used to trigger the power supply device (3) to supply power to the prompting device and the on-board charger (4), so as to wake up the prompting device and the on-board charger (4) to work, and the on-board charger (4) is used to charge the electric engineering machinery; The electric engineering machinery includes an ignition lock (10), and the control device (1) further includes an ON gear port (12) and a power control module (13), the normal power supply module (11) and the ON gear port (12) are respectively used to be electrically connected to the ignition lock (10), and the ignition lock (10) is used to be connected to the line between the first end and the normal power supply module (11), the second end is electrically connected to the ON gear port (12) for energizing the control device (1), and the power control module (13) is electrically connected to the power supply device (3).

2. The charging system according to claim 1, wherein: The power supply device (3) includes a battery (31), a first relay (32), and a power adapter (33) electrically connected in sequence. The power adapter (33) is electrically connected to the prompt device and the on-board charger (4), respectively, and the first relay (32) is also electrically connected to the control device (1) and / or the second end.

3. The charging system according to claim 2, wherein: The prompting device comprises a meter (51), the meter (51) is electrically connected to the power adapter (33), and the meter (51) is used to be arranged in the cab of the electric engineering machine.

4. The charging system according to claim 2, wherein: The prompt device includes an indicator light (52), and the power supply device (3) also includes a second relay (34). The second relay (34) is electrically connected to the indicator light (52) and the power adapter (33), respectively, and the indicator light (52) is used to be arranged on the side of the electric engineering machine.

5. The charging system according to claim 4, wherein: The device further comprises a first diode (6), wherein the first diode (6) is electrically connected to a circuit between the indicator light (52) and the second relay (34), wherein the positive electrode of the first diode (6) is electrically connected to the second relay (34), and the negative electrode of the first diode (6) is electrically connected to the indicator light (52).

6. The charging system according to claim 2, wherein: It also includes a fuse (9), which is electrically connected to the line between the battery (31) and the first relay (32), the line between the power adapter (33) and the prompt device, and the line between the power adapter (33) and the on-board charger (4).

7. The charging system according to claim 1, wherein: It also includes a second diode (7), which is electrically connected to the line between the second end and the ON gear port (12), and the anode of the second diode (7) is electrically connected to the second end, and the cathode of the second diode (7) is electrically connected to the ON gear port (12).

8. The charging system according to any one of claims 1 to 6, characterized in that: The device further comprises a third diode (8), wherein the third diode (8) is electrically connected to the line between the second end and the power supply device (3), and the anode of the third diode (8) is electrically connected to the second end, and the cathode of the third diode (8) is electrically connected to the power supply device (3).

9. An electric engineering machine, characterized in that: Comprising a charging system according to any one of claims 1 to 8.

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