Power receiving system and operating machinery

Abstract

The present invention provides a power receiving system and an operating machine, wherein the power receiving system comprises: a control module, a power battery module, a positive power receiving interface, a negative power receiving interface, a communication module and a charging port cover assembly; the control module is respectively connected to the power battery module, the communication module and the charging cover assembly, the positive power receiving interface and the negative power receiving interface are both connected to the power battery module, and the positive power receiving interface and the negative power receiving interface are also connected to the charging system; the communication module is used to communicate with the charging system, when the power receiving system receives charging from the charging system, the controller controls the charging port cover assembly to open, the positive power receiving interface and the negative power receiving interface are connected to the charging system, the power battery module is charged through the charging system, the charging time is effectively shortened, and the positive power receiving interface and the negative power receiving interface can be better protected through the charging port cover assembly, the power battery is better charged, and the working efficiency of the operating machine is improved.

Description

Technical Field

[0001] The present invention relates to the field of power receiving technology, and in particular to a power receiving system and an operating machine. Background Art

[0002] With the continuous upgrading of environmental protection requirements and emissions, the purchase cost of fuel-powered operating machinery, such as fuel trucks, is increasing, and the user's use and maintenance costs are also increasing. Therefore, electric operating machinery that can meet environmental protection and emission requirements and is economical and efficient is gradually being accepted by people. At present, the current of the larger international charging pile (1000V / 400A) results in a maximum charging power of 400KW.

[0003] However, since the power batteries of electric working machinery carry a large amount of electricity, the current power receiving current is difficult to meet, and there is a problem of slow charging. The long wait for charging will seriously affect the working efficiency of the working machinery. Summary of the invention

[0004] The present invention provides a power receiving system and an operating machine, which are used to solve the defect in the prior art that the power receiving current is difficult to meet the needs of fast charging. Through independent positive power receiving interfaces and negative power receiving interfaces, it is possible to safely receive large current charging, effectively shorten the charging time, and improve the working efficiency of the operating machine.

[0005] The present invention provides a power receiving system, comprising: a control module, a power battery module, a positive power receiving interface, a negative power receiving interface, a communication module and a charging port cover assembly;

[0006] The control module is connected to the power battery module, the communication module and the charging cover assembly respectively, the positive power receiving interface and the negative power receiving interface are both connected to the power battery module, and the positive power receiving interface and the negative power receiving interface are also connected to the charging system;

[0007] The communication module is used to communicate with the charging system. When the power receiving system receives charge from the charging system, the controller controls the charging port cover assembly to open, the positive power receiving interface and the negative power receiving interface establish connection with the charging system, and the power battery module is charged through the charging system.

[0008] According to a power receiving system provided by the present invention, the power battery module comprises: a power battery and a high-voltage box;

[0009] The power battery is connected to the positive power receiving interface and the negative power receiving interface respectively through the high-voltage box, and the high-voltage box is connected to the control module;

[0010] The high-voltage box is used to control the connection or disconnection between the power battery and the positive power receiving interface and the negative power receiving interface.

[0011] According to a power receiving system provided by the present invention, the high-voltage box comprises: a box body and a contactor;

[0012] The contactor is disposed in the box, the positive power receiving interface and the negative power receiving interface are connected to the power battery through the contactor, and the contactor is also connected to the control module;

[0013] The contactor is used to control the connection or disconnection between the power battery and the positive power receiving interface and the negative power receiving interface.

[0014] A power receiving system provided according to the present invention further includes an insulation detection mechanism;

[0015] The insulation detection mechanism is connected to the control module, and is used to detect insulation faults of the power receiving system. When an insulation fault occurs in the insulation detection mechanism, the control module controls the contactor to disconnect.

[0016] A power receiving system according to the present invention further includes: a temperature detection device and a cooling device;

[0017] The temperature detection device and the cooling device are both connected to the control component, and the temperature detection device is used to detect the temperature values ​​of the power battery module, the positive electrode power receiving interface and the negative electrode power receiving interface;

[0018] When the temperature value is greater than a preset temperature value, the cooling device is controlled to reduce the temperatures of the power battery module, the positive power receiving interface, and the negative power receiving interface.

[0019] According to a power receiving system provided by the present invention, the cooling device comprises: a liquid cooling unit and a cooling circuit;

[0020] The liquid cooling unit is used to cool the power battery module, and the cooling circuit is used to cool the positive power receiving interface and the negative power receiving interface.

[0021] According to a power receiving system provided by the present invention, the charging port cover assembly comprises: a cover body, a switch mechanism and a locking mechanism;

[0022] The switch mechanism and the locking mechanism are both mechanically connected to the cover body, and the switch mechanism and the locking mechanism are also connected to the control module;

[0023] The switch mechanism is used to control the closing or opening of the cover body, and the locking mechanism is used to lock the state of the cover body.

[0024] According to a power receiving system provided by the present invention, the charging port cover assembly further includes: a position detection assembly;

[0025] The position detection component is connected to the control module, and the position detection component is used to detect the open or closed position of the cover body.

[0026] According to the present invention, a power receiving system further includes: a guide limiting mechanism and a connection in place detection mechanism;

[0027] The guide limit mechanism is used to control the docking of the charging system with the positive power receiving interface and the negative power receiving interface;

[0028] The connection in place detection mechanism is used to check whether the charging system is properly plugged into the positive power receiving interface and the negative power receiving interface.

[0029] The present invention also provides a working machine, comprising a power receiving system as described in any one of the above items.

[0030] The present invention provides a power receiving system and an operating machine, wherein the power receiving system comprises: a control module, a power battery module, a positive power receiving interface, a negative power receiving interface, a communication module and a charging port cover assembly; the control module is respectively connected to the power battery module, the communication module and the charging cover assembly, the positive power receiving interface and the negative power receiving interface are both connected to the power battery module, and the positive power receiving interface and the negative power receiving interface are also connected to the charging system; the communication module is used to communicate with the charging system, and when the power receiving system receives charging from the charging system, the controller controls the charging port cover assembly to open, the positive power receiving interface and the negative power receiving interface establish connection with the charging system, the power battery module is charged through the charging system, and independent positive power receiving interfaces and negative power receiving interfaces are used to complete the power receiving of the high-power power receiving system, thereby effectively shortening the charging time, and the positive power receiving interface and the negative power receiving interface can be better protected through the charging port cover assembly, so as to better complete the charging of the power battery and improve the working efficiency of the operating machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 It is one of the structural schematic diagrams of the power receiving system provided by the present invention;

[0033] Figure 2This is the second structural schematic diagram of the power receiving system provided by the present invention. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] Combine the following Figure 1 and Figure 2 A power receiving system and a working machine of the present invention are described.

[0036] Figure 1 This is one of the structural schematic diagrams of the power receiving system provided by the present invention.

[0037] like Figure 1 As shown, an embodiment of the present invention provides a power receiving system, including: a control module, a power battery module, a positive power receiving interface, a negative power receiving interface, a communication module and a charging port cover assembly; the control module is connected to the power battery module, the communication module and the charging cover assembly respectively, the positive power receiving interface and the negative power receiving interface are both connected to the power battery module, and the positive power receiving interface and the negative power receiving interface are also connected to the charging system; the communication module is used to communicate with the charging system, when the power receiving system receives the charge from the charging system, the controller controls the charging port cover assembly to open, the positive power receiving interface and the negative power receiving interface establish a connection with the charging system, and the power battery module is charged through the charging system. Among them, the control module can be a control module separately set in the power receiving system, can communicate with the vehicle-mounted controller, can also be a branch of the vehicle-mounted controller, or can be a vehicle-mounted controller.

[0038] In a specific implementation process, large-scale operating machinery, such as excavators, trucks, etc., are used as examples for explanation, and the power receiving system is part of the operating machinery. The communication module can adopt network communication or other communication methods, such as Bluetooth, etc. In this embodiment, the network communication method is preferred, such as 5G network communication, that is, the wireless communication between the charging system and the power receiving system is realized through the 5G communication module. The power battery module is the power module of the operating machinery, which provides a power source for the operation of the operating machinery. The positive power receiving interface and the negative power receiving interface are mainly connected to the charging system, and the electric energy in the power grid is stored in the power battery module through the charging system. The charging port cover plate assembly is mainly to ensure the safety of the positive power receiving interface and the negative power receiving interface. When the power battery module does not need to be charged, the positive power receiving interface and the negative power receiving interface can be closed in time to prevent dust from entering the interface, resulting in problems such as poor contact.

[0039] In order to ensure the safety during the charging process, a grounding interface is usually provided to prevent safety accidents such as leakage during the charging process. Among them, the positive power receiving interface, the negative power receiving interface and the grounding interface all adopt a single-ended plug method to meet the maximum voltage requirement of 1500V (including but not limited to insulation withstand voltage and creepage distance); the positive power receiving interface and the negative power receiving interface adopt a terminal inlet cooling method to meet the maximum charging current of 3000A and meet the effective plug-in times of more than 10,000 times.

[0040] When the operating machinery needs to be charged, the driver drives the operating machinery to the corresponding charging position. One-touch parking is also possible. For example, after driving the operating machinery to the designated position, the one-touch parking button is activated to control the operating machinery to automatically park and charge, effectively helping the driver to better complete parking. After the operating machinery is parked stably, a self-inspection of the operating machinery is required, that is, it is necessary to ensure that there are no faults in the current power receiving system of the operating machinery and the operating machinery itself. After self-inspection to determine that there is no insulation fault in the power receiving system of the operating machinery and that there are no other faults in the entire vehicle, a charging request can be sent by operating the charging button of the operating machinery or through a bound mobile phone. The charging request is sent to the charging system through the 5G communication module to establish a handshake and then perform charging preparation actions.

[0041] For the power receiving system, the action that the power receiving system needs to perform is to accept the connection with the charging system. After completing the connection with the charging system, the charging with the power battery module can be completed. Before accepting the connection with the charging system, it is necessary to control the opening of the charging port cover assembly to automatically complete the docking of the charging system and the power receiving system. Among them, the charging system and the power receiving system are matched, that is, the charging system includes a positive charging interface and a negative charging interface, and both are independent interfaces. The charging interface matches the power receiving interface, that is, if the charging interface is a male head, the power receiving interface is a female head.

[0042] The process of matching the power receiving system with the charging system for charging is mainly as follows: the power receiving system sends a charging request to the charging system, and after the charging system establishes a communication connection with the power receiving system, the charging system controls the positive charging interface to match and plug with the positive power receiving interface of the power receiving system, and controls the negative charging interface to match and plug with the negative power receiving interface of the power receiving system. Before matching and plugging, the charging system first uses the dust removal structure to remove dust from the charging port cover assembly of the power receiving system. After the dust is removed, the power receiving system controls the charging port cover assembly to open, and the matching and plugging of the charging interface of the charging system and the power receiving interface of the power receiving system are completed. The charging system and the power receiving system control the corresponding circuits to be turned on, so that the charging system can be used to start charging the power receiving system.

[0043] A power receiving system provided in this embodiment includes: a control module, a power battery module, a positive power receiving interface, a negative power receiving interface, a communication module and a charging port cover assembly; the control module is connected to the power battery module, the communication module and the charging cover assembly respectively, the positive power receiving interface and the negative power receiving interface are both connected to the power battery module, and the positive power receiving interface and the negative power receiving interface are also connected to the charging system; the communication module is used to communicate with the charging system, when the power receiving system receives charging from the charging system, the controller controls the charging port cover assembly to open, the positive power receiving interface and the negative power receiving interface establish connection with the charging system, the power battery module is charged through the charging system, and the power receiving system of the high-power power receiving system is completed by using independent positive power receiving interface and negative power receiving interface, which effectively shortens the charging time, and the positive power receiving interface and the negative power receiving interface can be better protected through the charging port cover assembly, so as to better complete the charging of the power battery and improve the working efficiency of the operating machinery.

[0044] Figure 2 This is the second structural schematic diagram of the power receiving system provided by the present invention.

[0045] Further, such as Figure 2 As shown, on the basis of the above embodiment, the power battery module in this embodiment includes: a power battery and a high-voltage box; the power battery is connected to the positive power receiving interface and the negative power receiving interface respectively through the high-voltage box, and the high-voltage box is connected to the control module; the high-voltage box is used to control the connection or disconnection of the power battery with the positive power receiving interface and the negative power receiving interface.

[0046] Among them, the high-voltage box includes: a box body and a contactor; the contactor is arranged in the box body, the positive power receiving interface and the negative power receiving interface are connected to the power battery through the contactor, and the contactor is also connected to the control module; the contactor is used to control the connection or disconnection of the power battery with the positive power receiving interface and the negative power receiving interface.

[0047] Specifically, the main function of the power battery is to provide power for the operating machinery, and it is the power source of the operating machinery. The high-voltage box mainly controls the connection and disconnection between the power battery and the positive power receiving interface and the negative power receiving interface. The contactor in the high-voltage box controls the connection and disconnection between the power battery and the positive power receiving interface and the negative power receiving interface. Only after ensuring that the charging conditions are met will the contactor in the high-voltage box be closed, and the power battery will be effectively connected to the charging system to complete the charging preparation. Moreover, the box can also ensure the safety of the contactor and the charging circuit.

[0048] Further, such as Figure 2 As shown, based on the above embodiment, the power receiving system in this embodiment also includes an insulation detection mechanism; the insulation detection mechanism is connected to the control module, and the insulation detection mechanism is used to detect insulation faults in the power receiving system. When an insulation fault occurs in the insulation detection mechanism, the control module controls the contactor to disconnect.

[0049] Specifically, insulation failure refers to line leakage, etc. The cause of insulation failure is usually due to leakage of electrolyte inside the battery, which causes liquid to seep out. When the liquid seeps to a certain extent, the insulation layer will be destroyed. At this time, a conductive loop will appear between the battery module and the monomer, and the fault prompt will automatically turn on. If there is only one point of insulation failure in the system, it will not have a significant impact on the system for the time being, but if there are multiple points of insulation failure, leakage current will flow between the two points, which may cause a fire. Therefore, in order to ensure the safety of the power receiving system and operating machinery, it is necessary to use an insulation detection mechanism to detect whether an insulation failure has occurred in the power receiving system. For example, an insulation tester can be used to detect whether an insulation failure has occurred. When an insulation failure occurs, the contactor in the box is promptly controlled to disconnect, thereby protecting the safety of the power receiving system and related personnel.

[0050] Further, such as Figure 2 As shown, based on the above embodiment, this embodiment also includes a temperature detection device and a cooling device; the temperature detection device and the cooling device are both connected to the control component, and the temperature detection device is used to detect the temperature value of the power battery module, the positive power receiving interface and the negative power receiving interface; when the temperature value is greater than the preset temperature value, the cooling device is controlled to lower the temperature of the power battery module, the positive power receiving interface and the negative power receiving interface.

[0051] Among them, the cooling device includes: a liquid cooling unit and a cooling circuit; the liquid cooling unit is used to cool the power battery module, and the cooling circuit is used to cool the positive power receiving interface and the negative power receiving interface.

[0052] Specifically, in order to achieve fast charging, the current of the positive power receiving interface and the negative power receiving interface are very large. Therefore, the temperature during charging will be high. In order to avoid the high temperature from affecting the power receiving system, it is necessary to detect the temperature values ​​of the positive power receiving interface, the negative power receiving interface and the power battery module in real time during the charging process, including the temperature value of the high-voltage cable. When the temperature value is greater than the preset temperature value, it indicates that cooling is required, so the cooling device is started to cool down. When the temperature value reaches the critical temperature value, the control module will control the charging power of the power battery module, and ensure the safety of the power receiving system by reducing the charging power.

[0053] The liquid cooling unit and cooling circuit can be cooled by the air conditioning system. The flow of the liquid circuit can be controlled by the opening of the liquid cooling two-way valve, and the power receiving system can be cooled better by the flow of the liquid circuit. The flow of the liquid circuit can be controlled to match the heat dissipation power of the power receiving system, so that the current liquid circuit flow can be guaranteed to effectively achieve heat dissipation of the power receiving system.

[0054] Moreover, the liquid circuit of the power receiving system and the liquid circuit of the charging system can be connected. The connection or disconnection of the liquid circuits of the power receiving system and the charging system can be controlled by controlling the electronically controlled liquid valve. When the two are connected, a unified liquid cooling circuit can be used to achieve simultaneous cooling of the charging system and the power receiving system, thereby ensuring charging safety during the charging process, effectively solving the problem of low charging efficiency caused by high temperature, and also solving the safety hazard problem caused by high charging temperature.

[0055] Further, such as Figure 2 As shown, based on the above embodiment, the charging port cover assembly in this embodiment includes: a cover body, a switch mechanism and a locking mechanism; the switch mechanism and the locking mechanism are both mechanically connected to the cover body, and the switch mechanism and the locking mechanism are also connected to the control module; the switch mechanism is used to control the closing or opening of the cover body, and the locking mechanism is used to lock the state of the cover body.

[0056] Specifically, the cover body is a component that blocks and protects the positive power receiving interface and the negative power receiving interface, the switch mechanism is an automatic control structure that controls the closing or opening of the cover body, and the locking structure is a structure that controls the cover body to remain locked. For example, when the cover is closed, the locking structure locks the cover body to always be in a closed state and will not open. When the cover body is controlled to open, the locking structure will lock the structure of the cover body to an open state, and it will not close even if it receives other interference, thereby better ensuring the charging safety of the power receiving system. When the locking mechanism locks the cover body in a closed state with the positive power receiving interface and the negative power receiving interface, the protection level can reach IP67 or above, which can effectively prevent dust, rain, etc. from damaging the power battery module.

[0057] In the process of docking the positive charging interface and negative charging interface of the charging system with the positive receiving interface and negative receiving interface of the receiving system, the action flow of the cover body, the switch mechanism and the locking mechanism is as follows: when the positive charging interface and the negative charging interface are aligned with the positive receiving interface and the negative receiving interface respectively, the charging system will control the positive charging interface and the negative charging interface to continue to move toward the positive receiving interface and the negative receiving interface. Before docking, the locking mechanism locks the cover body in a closed state. When the distance between the charging interface and the receiving interface is a first preset distance, the dust removal structure of the charging system works to remove dust and other impurities on the cover body. After the removal is completed, the charging interface continues to be controlled to move toward the receiving interface. When the distance between the two is a second preset distance, the locking mechanism is controlled to unlock, and the cover body is controlled to open through the switch structure. The cover body automatically opens, and then the positive charging interface and the negative charging interface can be further moved, so that the positive charging interface matches the positive receiving interface, and the negative charging interface matches the negative receiving interface. After charging is completed, the positive charging interface and the negative charging interface are controlled to be unplugged. When the positive charging interface and the negative charging interface are at a second preset distance from the positive power receiving interface and the negative power receiving interface, the locking mechanism is unlocked, and the cover body is closed by controlling the switch mechanism, and the locking mechanism locks the cover body in a closed state.

[0058] Further, such as Figure 2 As shown, based on the above embodiment, the charging port cover assembly in this embodiment also includes: a position detection assembly; the position detection assembly is connected to the control module, and the position detection assembly is used to detect the open or closed position of the cover body.

[0059] Specifically, in order to ensure safety during the charging process, the matching and plugging of the positive charging interface, the negative charging interface, the positive power receiving interface and the negative power receiving interface can only be controlled when the cover body is in a fully open state. Therefore, it is necessary to accurately determine the opening and closing angles of the cover body, so a position detection component is provided, through which the specific opening or closing position of the cover body can be detected in real time. For example, it can be an angle sensor, or a distance sensor, etc. As long as it can effectively detect the opening or closing angle of the cover body.

[0060] Among them, a connection detection mechanism can also be provided. The main function of the connection detection mechanism is to detect whether the positive charging interface and the negative charging interface of the charging system are connected to the positive power receiving interface and the negative power receiving interface of the power receiving system. Only after ensuring that the connection is in place will the circuit be turned on and the power battery of the power receiving system will be charged through the charging system.

[0061] Further, such as Figure 2As shown, on the basis of the above embodiment, the power receiving system in this embodiment further includes: a guide limiting mechanism and a connection in place detection mechanism; the guide limiting mechanism is used to control the docking of the charging system with the positive power receiving interface and the negative power receiving interface; the connection in place detection mechanism is used to check whether the charging system is properly plugged into the positive power receiving interface and the negative power receiving interface.

[0062] Specifically, when receiving charge from the charging system, the guiding mechanism of the charging system will guide the positive charging interface and the negative charging interface of the charging system to move toward the positive power receiving interface and the negative power receiving interface. In order to ensure that the positive charging interface is matched with the positive power receiving interface, and the negative charging interface is matched with the negative power receiving interface, a guiding limiting mechanism is also provided in the power receiving system to ensure that the charging system and the power receiving system are quickly matched and plugged into place.

[0063] The connection in place detection mechanism interacts with the guide limit mechanism, the guide limit mechanism ensures the accuracy of the matching plug-in, and the connection in place detection mechanism structure ensures that the positive charging interface and the positive power receiving interface, the negative charging interface and the negative power receiving interface are plugged in place, which can effectively avoid the potential safety hazards caused by poor contact. For example, the connection in place detection mechanism can be a pressure sensor, a distance sensor, etc. The distance sensor detects the distance value between the interfaces, and the pressure sensor detects the pressure value between the interfaces.

[0064] In order to ensure the safety of the operating machinery, after charging is completed, the charging system will control the positive charging interface and the negative charging interface to retract. After retracting, the control module will control the switch mechanism and the locking mechanism to adjust the state of the cover to the closed state. Therefore, if the connection detection mechanism detects that the positive charging interface and the positive power receiving interface, the negative charging interface and the negative power receiving interface are in a connected state, or detects that the cover body is in an open state, it indicates that it is in a charging state or is not charging but the charging system and the power receiving system are in a connected state. Therefore, the power receiving system needs to send a prohibition driving instruction to the on-board controller to ensure that the vehicle does not move during the charging process, thereby ensuring the charging safety of the power receiving system.

[0065] Based on the same general inventive concept, the present invention also protects an operating machine, which includes a power receiving system as described in any of the above embodiments, and the operating machine includes a truck, an excavator, a crane, and the like.

[0066] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0067] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A power receiving system, characterized in that: include: Control module, power battery module, positive power receiving interface, negative power receiving interface, communication module and charging port cover assembly; The control module is connected to the power battery module, the communication module and the charging port cover assembly respectively, the positive power receiving interface and the negative power receiving interface are both connected to the power battery module, and the positive power receiving interface and the negative power receiving interface are also connected to the charging system; the charging system includes a positive charging interface and a negative charging interface, and the positive charging interface and the negative charging interface are both independent interfaces, and the charging interface matches the power receiving interface; The communication module is used to communicate with the charging system. When the power receiving system receives the charge from the charging system, the control module controls the charging port cover assembly to open, the positive power receiving interface and the negative power receiving interface establish a connection with the charging system, and the power battery module is charged through the charging system; The charging port cover assembly includes: a cover body, a switch mechanism, a locking mechanism and a dust removal mechanism; The switch mechanism and the locking mechanism are both mechanically connected to the cover body, and the switch mechanism and the locking mechanism are also connected to the control module; The switch mechanism is used to control the closing or opening of the cover body, and the locking mechanism is used to lock the state of the cover body; Before the charging interface and the power receiving interface are connected, the locking mechanism is used to lock the cover body in a closed state; When the distance between the charging interface and the power receiving interface is a first preset distance, using the dust removal mechanism to remove dust on the cover body; After the dust on the cover body is removed, the charging interface is controlled to move toward the power receiving interface, and when the distance between the charging interface and the power receiving interface is a second preset distance, the locking mechanism controls the cover body to be unlocked, and the switch mechanism controls the cover body to be opened, so that the charging interface moves to match the corresponding positive power receiving interface; The charging port cover assembly further includes: a position detection assembly; The position detection component is connected to the control module, and is used to detect the open or closed position of the cover body. The open or closed position of the cover body is the opening and closing angle of the cover body. The position detection component is an angle sensor or a distance sensor.

2. The power receiving system according to claim 1, characterized in that: The power battery module comprises: a power battery and a high-voltage box; The power battery is connected to the positive power receiving interface and the negative power receiving interface respectively through the high-voltage box, and the high-voltage box is connected to the control module; The high-voltage box is used to control the connection or disconnection between the power battery and the positive power receiving interface and the negative power receiving interface.

3. The power receiving system according to claim 2, characterized in that: The high voltage box comprises: a box body and a contactor; The contactor is disposed in the box, the positive power receiving interface and the negative power receiving interface are connected to the power battery through the contactor, and the contactor is also connected to the control module; The contactor is used to control the connection or disconnection between the power battery and the positive power receiving interface and the negative power receiving interface.

4. The power receiving system according to claim 3, characterized in that: It also includes insulation testing agencies; The insulation detection mechanism is connected to the control module, and is used to detect insulation faults of the power receiving system. When an insulation fault occurs in the insulation detection mechanism, the control module controls the contactor to disconnect.

5. The power receiving system according to claim 1, characterized in that: Also includes: Temperature detection device and cooling device; The temperature detection device and the cooling device are both connected to the control component, and the temperature detection device is used to detect the temperature values ​​of the power battery module, the positive electrode power receiving interface and the negative electrode power receiving interface; When the temperature value is greater than a preset temperature value, the cooling device is controlled to reduce the temperatures of the power battery module, the positive power receiving interface, and the negative power receiving interface.

6. The power receiving system according to claim 5, characterized in that: The cooling device comprises: a liquid cooling unit and a cooling circuit; The liquid cooling unit is used to cool the power battery module, and the cooling circuit is used to cool the positive power receiving interface and the negative power receiving interface.

7. The power receiving system according to any one of claims 1 to 6, characterized in that: Also includes: Guide limit mechanism and connection position detection mechanism; The guide limit mechanism is used to control the docking of the charging system with the positive power receiving interface and the negative power receiving interface; The connection in place detection mechanism is used to check whether the charging system is properly plugged into the positive power receiving interface and the negative power receiving interface.

8. A working machine, characterized in that: The working machine includes the power receiving system according to any one of claims 1 to 7.

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