Online power supply and charging system and control method

Abstract

The present application provides an online power supply and charging system and a control method, which connects to an external power supply and supplies power to a motor module through an on-board charger module; connects or disconnects the electrical connection between the battery module and the motor module, and connects or disconnects the electrical connection between the on-board charger module and the battery module through a switch module; performs voltage conversion on the output voltage of the battery module through a voltage conversion module to supply power to the motor module, and performs voltage conversion on the input voltage of the voltage conversion module to charge the battery module, thereby controlling the current size of the battery module charge and discharge and reducing the number of charge and discharge times of the battery module; when the motor module suddenly stops, the voltage conversion module can perform voltage conversion on the input current of the battery to protect the battery safety; at the same time, the capacity requirement of the battery module is relatively low, which greatly reduces the cost of the entire system.

Description

Technical Field

[0001] The present application belongs to the field of vehicle power supply technology, and in particular relates to an online power supply and charging system and a control method. Background Art

[0002] At present, pure electric construction machinery vehicles generally use an on-board charger to directly power the motor, or use a built-in battery to power the motor.

[0003] However, the allowable charging current of the built-in battery must be greater than the maximum output current of the on-board charger. Otherwise, when the motor suddenly stops, the on-board charger will not be able to respond in time, which will cause a large current to charge the built-in battery, bringing safety issues to the built-in battery. At the same time, because the allowable charging current of the built-in battery is high, the capacity requirement of the built-in battery is large, and the cost of the built-in battery accounts for nearly 70% of the entire power system, resulting in high system costs. Summary of the Invention

[0004] The purpose of this application is to provide an online power supply and charging system and a control method, aiming to solve the problems of low safety and high cost of traditional online power supply and charging systems.

[0005] To achieve the above objectives, in a first aspect, embodiments of the present application provide an online power supply and charging system for an engineering vehicle, comprising:

[0006] a motor module configured to control the operation process of the engineering machinery vehicle;

[0007] a battery module configured to receive or release electrical energy;

[0008] an on-board charger module, electrically connected to the motor module and configured to access an external power source and supply power to the motor module;

[0009] a switch module electrically connected to the motor module, the battery module, and the on-board charger module, and configured to connect or disconnect the electrical connection between the battery module and the motor module, and connect or disconnect the electrical connection between the on-board charger module and the battery module;

[0010] The voltage conversion module is electrically connected to the switch module, the motor module, the battery module and the on-board charger module, and is configured to perform voltage conversion on the output voltage of the battery module and then supply power to the motor module, and to perform voltage conversion on the input voltage of the voltage conversion module and then charge the battery module.

[0011] In a possible implementation of the first aspect, the online power supply and charging system further includes:

[0012] The vehicle controller is electrically connected to the motor module, the battery module, the on-board charger module and the switch module, and is configured to control the working state of the motor module, control the charging and discharging process of the battery module, control the on-board charger module to access an external power supply, and control the on / off state of the switch module.

[0013] In another possible implementation manner of the first aspect, the battery module includes:

[0014] a power battery, electrically connected to the voltage conversion module and the switch module, and configured to store electrical energy;

[0015] A battery management unit is electrically connected to the power battery and the voltage conversion module, and is configured to control the charge and discharge process of the power battery and control the voltage conversion module to perform voltage conversion on the input voltage or output voltage of the power battery.

[0016] In another possible implementation manner of the first aspect, the motor module includes:

[0017] a motor configured to provide power to the engineering machinery vehicle;

[0018] The motor controller is electrically connected to the motor, the on-board charger module, the voltage conversion module and the switch module, and is configured to control the operation of the motor.

[0019] In another possible implementation of the first aspect, the voltage conversion module includes a bidirectional DC / DC converter.

[0020] In a second aspect, an embodiment of the present application provides a control method for an online power supply and charging system, which is applied to the online power supply and charging system, comprising the following steps:

[0021] Controlling the voltage conversion module to convert the output voltage of the battery module and then supplying power to the motor module;

[0022] Alternatively, the on-board charger module is controlled to supply power to the motor module and the battery module, and the voltage conversion module is controlled to perform voltage conversion on the input voltage of the voltage conversion module or the output voltage of the battery module, so as to charge or discharge the battery module.

[0023] In another possible implementation of the second aspect, controlling the voltage conversion module to convert the output voltage of the battery module and then supplying power to the motor module includes:

[0024] When the electrical connection between the on-board charger module, the motor module and the voltage conversion module is disconnected and when the output voltage of the battery module is lower than the required voltage of the motor module, the switch module is controlled to disconnect the electrical connection between the battery module and the motor module, and the output voltage of the battery module is boosted by the voltage conversion module to supply power to the motor module.

[0025] In another possible implementation of the second aspect, controlling the on-board charger module to supply power to the motor module and the battery module, and controlling the voltage conversion module to convert an input voltage of the voltage conversion module or an output voltage of the battery module to charge or discharge the battery module, includes:

[0026] When the electrical connection between the on-board charger module, the voltage conversion module and the motor module is connected, the switch module is controlled to disconnect the electrical connection between the battery module and the motor module, and power is supplied to the voltage conversion module and the motor module through the on-board charger module. At the same time, the voltage conversion module is used to convert the input voltage of the voltage conversion module or the output voltage of the battery module so that the battery module is charged or discharged.

[0027] In another possible implementation of the second aspect, the control method further includes:

[0028] When the switch module is disconnected and the electrical connection between the on-board charger module and the voltage conversion module is disconnected, power is supplied to the motor module through the on-board charger module.

[0029] In another possible implementation of the second aspect, the control method further includes:

[0030] When the electrical connection between the on-board charger module, the motor module and the voltage conversion module is disconnected and the output voltage of the battery module is greater than or equal to the required voltage of the motor module, the switch module is controlled to connect the electrical connection between the battery module and the motor module, and power is supplied to the motor module through the battery module.

[0031] In another possible implementation of the second aspect, the control method further includes:

[0032] When the motor stops normally, the switch module is controlled to connect the electrical connection between the on-board charger module and the battery module, so that the battery module is charged through the on-board charger module.

[0033] Compared with the prior art, the embodiments of the present application have the following beneficial effects: the above-mentioned online power supply and charging system is connected to an external power supply and supplies power to the motor module through the on-board charger module; the electrical connection between the battery module and the motor module is connected or disconnected, and the electrical connection between the on-board charger module and the battery module is connected or disconnected through the switch module; the output voltage of the battery module is converted into voltage by the voltage conversion module to supply power to the motor module, and the input voltage of the voltage conversion module is converted into voltage to charge the battery module, thereby controlling the current size of the battery module charge and discharge and reducing the number of charge and discharge times of the battery module; when the motor module suddenly stops, the voltage conversion module can be used to convert the input current of the battery to protect the safety of the battery; at the same time, the capacity requirement of the battery module is relatively low, which greatly reduces the cost of the entire system. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0035] Figure 1 A schematic diagram of the structure of an online power supply and charging system provided in an embodiment of the present application;

[0036] Figure 2 This is a schematic diagram of the specific structure of the online power supply and charging system provided in an embodiment of the present application.

[0037] Description of reference numerals:

[0038] 1-Motor module, 11-Motor, 12-Motor controller, 2-Battery module, 21-Power battery, 22-Battery management unit, 3-Onboard charger module, 4-Switch module, 5-Voltage conversion module, 6-Vehicle controller. DETAILED DESCRIPTION

[0039] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application more clearly understood, this application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0040] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0041] Currently, traditional pure electric construction vehicles generally use an onboard charger to directly power the motor, or use an internal battery to power the motor. The battery's allowable charging current must be greater than the onboard charger's maximum output current. Otherwise, if the motor suddenly stops, the onboard charger will charge the battery with a high current, burning the battery. Furthermore, the battery's charge and discharge currents are uncontrolled, leading to frequent charging and discharging, which reduces the number of charge and discharge cycles and shortens its service life. Because the battery's allowable charging current is high, the required capacity is high. Since the cost of the battery accounts for nearly 70% of the entire power system, this limits the battery capacity selection and increases system costs, hindering vehicle cost reduction and battery standardization. Furthermore, when the battery's voltage is low, it cannot power the motor simultaneously with the onboard charger and can only do so after charging to a preset voltage, thus affecting the vehicle's maximum power.

[0042] To this end, the present application provides an online power supply and charging system, which uses a voltage conversion module to convert the output voltage of the battery module and then supply power to the motor module, or converts the input voltage of the voltage conversion module and then charges the battery module, thereby controlling the current size of the battery module charging and discharging, reducing the number of charge and discharge times of the battery module, protecting the battery safety, and reducing system costs.

[0043] The following is an exemplary description of the online power supply and charging system provided by the present application with reference to the accompanying drawings: Figure 1 This is a structural diagram of an online power supply and charging system provided in an embodiment of the present application, such as Figure 1 For ease of explanation, only the parts related to this embodiment are shown, which are described in detail as follows: For example, the online power supply and charging system is applied to engineering machinery vehicles, including:

[0044] The motor module 1 is configured to control the operation process of the engineering machinery vehicle;

[0045] a battery module 2 configured to receive or release electrical energy;

[0046] The on-board charger module 3 is electrically connected to the motor module 1 and is configured to access an external power source and supply power to the motor module 1;

[0047] a switch module 4 electrically connected to the motor module 1, the battery module 2, and the onboard charger module 3, configured to connect or disconnect the electrical connection between the battery module 2 and the motor module 1, and to connect or disconnect the electrical connection between the onboard charger module 3 and the battery module 2;

[0048] The voltage conversion module 5 is electrically connected to the switch module 4, the motor module 1, the battery module 2 and the on-board charger module 3, and is configured to perform voltage conversion on the output voltage of the battery module 2 and then supply power to the motor module 1, and to perform voltage conversion on the input voltage of the voltage conversion module 5 and then charge the battery module 1.

[0049] In an embodiment of the present application, when only the electrical connection between the on-board charger module and the motor module is established, the on-board charger module is connected to an external power source (i.e., the on-board charger module is in an external power supply online state) and supplies power to the motor module. By turning the switch module on or off, the battery module can supply power to the motor module, or the on-board charger module can charge the battery module. The voltage conversion module can perform voltage conversion (e.g., step-up conversion) on the output voltage of the battery module before supplying power to the motor module, or perform voltage conversion (e.g., step-down conversion or step-up conversion) on the input voltage of the voltage conversion module before charging the battery module. This allows control of the input and output voltages of the battery module to prevent damage to the battery module due to excessive voltage, thereby improving the safety of the battery module and reducing the battery capacity requirements, thereby reducing system production costs. Furthermore, when the battery module voltage is low, the voltage conversion module can be used to increase the voltage and directly supply power to the motor module, avoiding the traditional online charging and discharging system, which requires the battery module to be charged before continuing to supply power to the motor module. This reduces the number of charge and discharge cycles consumed by the battery module, improves battery life, improves power supply efficiency, and ensures maximum vehicle power.

[0050] Figure 2 This is a schematic diagram of the specific structure of the online power supply and charging system provided in the embodiment of the present application, as shown in FIG. Figure 2 As shown, exemplarily, the online power supply charging system further includes:

[0051] The vehicle controller 6 is electrically connected to the motor module 1, the battery module 2, the on-board charger module 3 and the switch module 4, and is configured to control the working state of the motor module 1, control the charging and discharging process of the battery module 2, control the on-board charger module 3 to access the external power supply, and control the on / off state of the switch module 4.

[0052] In the embodiment of the present application, the start and stop of the motor module are controlled by the vehicle controller, the charging and discharging of the battery module are controlled by the vehicle controller, and the input voltage of the voltage conversion module or the output voltage of the battery module is converted by controlling the voltage conversion module, so that when the input voltage is too high, the voltage is reduced to protect the battery module, or when the output voltage is too low, the voltage is increased so that the motor module can be powered normally; the on-board charger module is controlled by the vehicle controller to connect to the external power supply and supply power to the motor module or the voltage conversion module, and the on and off states of the switch module are controlled by the vehicle controller.

[0053] like Figure 2 As shown, illustratively, the battery module 2 includes:

[0054] 21 power battery, electrically connected to the voltage conversion module 5 and the switch module 4, configured to store electrical energy;

[0055] The battery management unit 22 is electrically connected to the power battery 21 and the voltage conversion module 5 , and is configured to control the charging and discharging process of the power battery 21 and control the voltage conversion module 5 to perform voltage conversion on the input voltage or output voltage of the power battery 21 .

[0056] In an embodiment of the present application, the battery management unit sends a power requirement to the on-board charger module according to the charging instruction issued by the vehicle controller, thereby realizing the charging process of the power battery, and simultaneously sends a boost or buck instruction to the voltage conversion module to boost the output voltage of the power battery to meet the power supply requirements of the motor module, or to buck the input voltage of the power battery to prevent the power battery from being burned by excessive voltage.

[0057] like Figure 2 As shown, the motor module 1 exemplarily includes:

[0058] The motor 11 is configured to provide power to the engineering machinery vehicle;

[0059] The motor controller 12 is electrically connected to the motor 11 , the onboard charger module 3 , the voltage conversion module 5 and the switch module 4 , and is configured to control the operation of the motor.

[0060] In this embodiment, the motor controller obtains electric energy from the voltage conversion module or the on-board charger module to complete the driving of the motor module.

[0061] like Figure 2 As shown, the voltage conversion module may include a bidirectional DC / DC converter (ie, Direct current-Direct current converter, DC to DC converter).

[0062] In an embodiment of the present application, the voltage conversion module may include a bidirectional DC / DC converter, so that the output voltage or input voltage of the battery module can be stepped up or down. When the battery module is at a low voltage, the voltage can be increased to meet the required voltage of the motor module, and when the input voltage is too high, the voltage can be stepped down for charging, thereby protecting the battery module and preventing it from being burned by excessive voltage.

[0063] Exemplarily, the on-board charger module includes a direct contact power supply device and a contactless power supply device.

[0064] In the embodiment of the present application, the on-board charger module includes a direct contact power supply device and a contactless power supply device, so that power can be obtained from the power grid in a direct contact manner or a contactless manner, thereby realizing the online charging of the present application.

[0065] Illustratively, the battery capacity of the battery module is 10 to 50 KWh.

[0066] In the embodiment of the present application, the battery capacity of the battery module is 10 to 50 KWh, for example, 16 KWh, which greatly reduces the battery capacity requirement of the battery module, thereby effectively reducing the production cost of the entire system.

[0067] Exemplarily, the switch module includes an electromagnetic relay.

[0068] In the embodiment of the present application, the switch module includes an electromagnetic relay, so that the switch module can be turned on or off according to the switch instruction of the vehicle control.

[0069] Exemplarily, the engineering machinery vehicle includes a pure electric vehicle.

[0070] In the embodiment of the present application, the engineering machinery vehicle includes a pure electric vehicle, so that the system is not only applicable to large-scale engineering machinery vehicles used in engineering construction, but also to ordinary pure electric vehicles, and has a wide range of applications.

[0071] Illustratively, this embodiment discloses an engineering machinery vehicle, which uses an online power supply and charging system.

[0072] In an embodiment of the present application, an engineering machinery vehicle applies the online power supply and charging system of the present application, so that when only the electrical connection between the on-board charger module and the motor module is connected inside the engineering machinery vehicle, the external power supply is connected through the on-board charger module to power the motor module. By turning on or off the switch module, the battery module can supply power to the motor module, or the on-board charger module can charge the battery module. The output voltage of the battery module can be converted by the voltage conversion module to supply power to the motor module, or the input voltage of the voltage conversion module can be converted (for example, step-down conversion or step-up conversion) to charge the battery module.

[0073] Illustratively, this embodiment discloses a control method for an online power supply and charging system, including the following steps performed by a vehicle controller:

[0074] The control voltage conversion module converts the output voltage of the battery module and then supplies power to the motor module;

[0075] Alternatively, the on-board charger module is controlled to supply power to the motor module and the battery module, and the voltage conversion module is controlled to convert the input voltage of the voltage conversion module or the output voltage of the battery module to charge or discharge the battery module.

[0076] In an embodiment of the present application, when only the electrical connection between the on-board charger module and the motor module is connected, the motor module can be powered by the on-board charger module; when only the electrical connection between the battery module and the motor module is connected, the motor module can be powered by the battery module; when the motor module is shut down, the battery module can be charged by the on-board charger module; when the output voltage of the battery module is lower than the required voltage of the motor module, the output voltage of the battery module can be converted by the voltage conversion module and then powered to the motor module; when the on-board charger module supplies power to the battery module and the motor module at the same time, the input voltage of the voltage conversion module or the output voltage of the battery module can be converted by controlling the voltage conversion module to charge or discharge the battery module.

[0077] Exemplarily, controlling the voltage conversion module to convert the output voltage of the battery module and then supplying power to the motor module includes:

[0078] When the electrical connection between the on-board charger module, the motor module and the voltage conversion module is disconnected and when the output voltage of the battery module is lower than the required voltage of the motor module, the control switch module disconnects the electrical connection between the battery module and the motor module, and the output voltage of the battery module is boosted by the voltage conversion module to supply power to the motor module.

[0079] In an embodiment of the present application, when the electrical connection between the on-board charger module, the motor module and the voltage conversion module is disconnected and when the output voltage of the battery module is lower than the required voltage of the motor module, the system is in the on-board charger offline mode. Because the current output voltage of the battery module cannot meet the required voltage of the motor module, the output voltage of the battery module needs to be boosted by the voltage conversion module to meet the required voltage of the motor module, so that power can be supplied to the motor module to maintain normal operation of the motor.

[0080] Exemplarily, controlling the on-board charger module to supply power to the motor module and the battery module, and controlling the voltage conversion module to convert the input voltage of the voltage conversion module or the output voltage of the battery module to charge or discharge the battery module includes:

[0081] When the electrical connection between the on-board charger module and the voltage conversion module and the motor module is connected, the control switch module disconnects the electrical connection between the battery module and the motor module, and power is supplied to the voltage conversion module and the motor module through the on-board charger module. At the same time, the voltage conversion module converts the input voltage of the voltage conversion module or the output voltage of the battery module to charge or discharge the battery module.

[0082] In an embodiment of the present application, when the electrical connection between the on-board charger module, the voltage conversion module and the motor module is connected, and the system is in the on-board charger module and the battery module are both online mode, the control switch module disconnects the electrical connection between the battery module and the motor module, and the on-board charger module simultaneously supplies power to the voltage conversion module and the motor module. At the same time, when the motor module suddenly stops, the on-board charger module cannot respond in time, and a large current is charged to the battery module, the input voltage of the voltage conversion module can be reduced by the voltage conversion module to protect the normal charging of the battery module. At the same time, when the output voltage of the battery module is too low or the required voltage of the motor module is too high, the output voltage of the battery module can be boosted by the voltage conversion module to supply power to the motor module normally.

[0083] Exemplarily, the vehicle-mounted charger module is controlled to supply power to the motor module, and the control method further includes:

[0084] When the switch module is turned off and the electrical connection between the on-board charger module and the voltage conversion module is disconnected, power is supplied to the motor module through the on-board charger module.

[0085] In an embodiment of the present application, when the switch module is disconnected, the electrical connection between the on-board charger module and the voltage conversion module is disconnected, and there is no three-phase AC input, the system is in battery offline mode, and power is supplied to the motor module only through the on-board charger module.

[0086] Exemplarily, the battery module is controlled to supply power to the motor module, and the control method further includes:

[0087] When the electrical connection between the on-board charger module, the motor module and the voltage conversion module is disconnected and the output voltage of the battery module is greater than or equal to the required voltage of the motor module, the control switch module connects the electrical connection between the battery module and the motor module, and supplies power to the motor module through the battery module.

[0088] In an embodiment of the present application, when the electrical connection between the on-board charger module and the motor module and the voltage conversion module is disconnected, the system is in the on-board charger offline mode. When the output voltage of the battery module is greater than or equal to the required voltage of the motor module, it means that the normal output voltage of the battery module can meet the required voltage of the motor module. Therefore, the switch module is directly controlled to connect the electrical connection between the battery module and the motor module, and power is supplied to the motor module through the battery module.

[0089] Exemplarily, the control method of controlling the on-board charger module to charge the battery module further includes:

[0090] When the motor stops normally, the control switch module switches on the electrical connection between the on-board charger module and the battery module, and charges the battery module through the on-board charger module.

[0091] In the embodiment of the present application, when the motor is normally shut down, the system is in a battery charging-only mode, so the control switch module connects the electrical connection between the on-board charger module and the battery module, and charges the battery module through the on-board charger module.

[0092] It should be understood that the size of the serial numbers of the steps in the above embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0093] Those skilled in the art can clearly understand that, for the convenience and brevity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In actual applications, the above-mentioned functions can be distributed and completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiment can be integrated into one processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0094] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant description of other embodiments.

[0095] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0096] In the embodiments provided herein, it should be understood that the disclosed UPS parallel redundancy system and method can be implemented in other ways. For example, the UPS parallel redundancy system embodiments described above are merely illustrative. For example, the division of modules or units is merely a logical functional division. In actual implementation, other divisions may be employed, such as combining or integrating multiple units or components into another system, or omitting or disabling certain features. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection via some interface, device, or unit, and may be electrical, mechanical, or other.

[0097] Units described as separate components may or may not be physically separate, and components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0098] In addition, the functional units in the various embodiments of the present application may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0099] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application 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. 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 various embodiments of the present application, and should all be included in the scope of protection of the present application.

Claims

1. An online power supply and charging system, applied to engineering machinery vehicles, characterized in that: include: a motor module configured to control the operation process of the engineering machinery vehicle; a battery module configured to receive or release electrical energy; an on-board charger module, electrically connected to the motor module and configured to access an external power source and supply power to the motor module; a switch module electrically connected to the motor module, the battery module, and the on-board charger module, and configured to connect or disconnect the electrical connection between the battery module and the motor module so that the battery module supplies power to the motor module; and connect or disconnect the electrical connection between the on-board charger module and the battery module so that the on-board charger module charges the battery module; a voltage conversion module electrically connected to the switch module, the motor module, the battery module, and the on-board charger module, and configured to, when the output voltage of the battery module is too low or the required voltage of the motor module is too high, step up the output voltage of the battery module and supply power to the motor module; and, when the motor module suddenly stops, step down the input voltage of the voltage conversion module and charge the battery module; When only the electrical connection between the on-board charger module and the motor module is connected, power is supplied to the motor module through the on-board charger module; when only the electrical connection between the battery module and the motor module is connected, power is supplied to the motor module through the battery module; when the motor module is shut down, the battery module is charged through the on-board charger module; when the output voltage of the battery module is lower than the required voltage of the motor module, the output voltage of the battery module is converted by the voltage conversion module and then power is supplied to the motor module; when the on-board charger module supplies power to the battery module and the motor module at the same time, the input voltage of the voltage conversion module or the output voltage of the battery module is converted by controlling the voltage conversion module to charge or discharge the battery module.

2. The online power supply and charging system according to claim 1, wherein: The online power supply and charging system further includes: The vehicle controller is electrically connected to the motor module, the battery module, the on-board charger module and the switch module, and is configured to control the working state of the motor module, control the charging and discharging process of the battery module, control the on-board charger module to access the external power supply, and control the on / off state of the switch module.

3. The online power supply and charging system according to claim 1, wherein: The battery module includes: a power battery, electrically connected to the voltage conversion module and the switch module, and configured to store electrical energy; A battery management unit is electrically connected to the power battery and the voltage conversion module, and is configured to control the charge and discharge process of the power battery and control the voltage conversion module to perform voltage conversion on the input voltage or output voltage of the power battery.

4. The online power supply and charging system according to claim 1, wherein: The motor module includes: a motor configured to provide power to the engineering machinery vehicle; The motor controller is electrically connected to the motor, the on-board charger module, the voltage conversion module and the switch module, and is configured to control the operation of the motor.

5. The online power supply and charging system according to claim 1, wherein: The voltage conversion module includes a bidirectional DC / DC converter.

6. A control method for an online power supply and charging system, characterized in that: The online power supply and charging system according to any one of claims 1 to 5 comprises the following steps: Controlling the voltage conversion module to convert the output voltage of the battery module and then supplying power to the motor module; Alternatively, the on-board charger module is controlled to supply power to the motor module and the battery module, and the voltage conversion module is controlled to perform voltage conversion on the input voltage of the voltage conversion module or the output voltage of the battery module, so as to charge or discharge the battery module.

7. The control method according to claim 6, wherein: The controlling the voltage conversion module to convert the output voltage of the battery module and then supply power to the motor module includes: When the electrical connection between the on-board charger module, the motor module and the voltage conversion module is disconnected and when the output voltage of the battery module is lower than the required voltage of the motor module, the switch module is controlled to disconnect the electrical connection between the battery module and the motor module, and the output voltage of the battery module is boosted by the voltage conversion module to supply power to the motor module.

8. The control method according to claim 6, wherein: The controlling the on-board charger module to supply power to the motor module and the battery module, and simultaneously controlling the voltage conversion module to convert the input voltage of the voltage conversion module or the output voltage of the battery module so as to charge or discharge the battery module, includes: When the electrical connection between the on-board charger module, the voltage conversion module and the motor module is connected, the switch module is controlled to disconnect the electrical connection between the battery module and the motor module, and power is supplied to the voltage conversion module and the motor module through the on-board charger module. At the same time, the voltage conversion module is used to convert the input voltage of the voltage conversion module or the output voltage of the battery module so that the battery module is charged or discharged.

9. The control method according to claim 6, wherein: The control method further includes: When the switch module is disconnected and the electrical connection between the on-board charger module and the voltage conversion module is disconnected, power is supplied to the motor module through the on-board charger module.

10. The control method according to claim 6, wherein: The control method further includes: When the electrical connection between the on-board charger module, the motor module and the voltage conversion module is disconnected and the output voltage of the battery module is greater than or equal to the required voltage of the motor module, the switch module is controlled to connect the electrical connection between the battery module and the motor module, and power is supplied to the motor module through the battery module.

11. The control method according to claim 6, wherein: The control method further includes: When the motor stops normally, the switch module is controlled to connect the electrical connection between the on-board charger module and the battery module, so that the battery module is charged through the on-board charger module.

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