Mower, mobile charger and mobile power supply

Abstract

The invention discloses a mower, outdoor walking equipment, a mobile charger and a mobile power supply. The mowing machine comprises a frame, a walking wheel set, a walking motor, a mowing assembly, a mowing motor and at least one air storage tank, and the air storage tank of the mowing machine is installed on the frame and is configured to provide an air source for operation of the mowing machine.

Description

Lawn mowers, mobile chargers and mobile power supplies

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on September 26, 2023, with application number 202311260859.1, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to a lawn mowing device, for example, a lawn mower, a mobile charger and a mobile power supply. Background Art

[0003] A lawn mower, also known as a weed cutter, lawn mower, or lawn trimmer, is a mechanical tool used to trim grass and vegetation. It consists of a chassis, engine, running mechanism, cutting element, and operating mechanism. The engine is mounted on the chassis, and the cutting element is mounted on the engine's output shaft. The cutting element utilizes the engine's high-speed rotation to significantly increase its speed, saving workers time and reducing labor costs.

[0004] This section provides background information related to the present application which is not necessarily prior art.

[0005] Summary of the Invention

[0006] An object of the present application is to solve or at least alleviate some or all of the above problems. To this end, an object of the present application is to provide a lawn mower with a low center of gravity, a strong load-bearing capacity of the frame, which can accommodate a relatively large gas tank and ensure that the lawn mower can move stably.

[0007] In order to achieve the above objectives, this application adopts the following technical solutions:

[0008] A lawn mower comprises: a frame; a travel wheel assembly comprising travel wheels supporting the frame; a travel motor configured to drive the travel wheels to rotate; a mowing assembly comprising a mowing element configured to mow grass; a mowing motor configured to drive the mowing element to mow grass; the lawn mower further comprises at least one gas tank, which is mounted on the frame and configured to provide an air source for the operation of the lawn mower.

[0009] In some embodiments, the lawn mower is a riding lawn mower, and the lawn mower further includes a seat, and at least one gas tank is disposed behind the seat.

[0010] In some embodiments, the lawn mower further includes a steering wheel, and the at least one gas tank is disposed in front of the steering wheel.

[0011] In some embodiments, the lawn mower further includes a battery stack connected to the gas tank via a gas delivery pipe, and the battery stack is configured to supply power to the lawn mower.

[0012] In some embodiments, the lawn mower is a riding lawn mower, which further includes a seat, and the battery stack is disposed under the seat.

[0013] In some embodiments, the volume of the gas storage tank is greater than or equal to 30 L and less than or equal to 60 L.

[0014] In some embodiments, there are 2n air storage tanks, and the 2n air storage tanks are symmetrically arranged with the center line of the rotating shaft connecting the two walking wheels as the center, where n is a positive integer.

[0015] In some embodiments, a cover is provided above the traveling wheel, and the gas tank is provided on the lower side of the cover positioned at the rear.

[0016] In some embodiments, the gas storage tank is a hydrogen tank.

[0017] In some embodiments, the vehicle frame includes a crossbeam and a longitudinal beam, and the gas tank is parallel to the crossbeam or the longitudinal beam.

[0018] The present application adopts the following technical solution: a lawn mower, comprising: a frame; a walking wheel group, including walking wheels supporting the frame; a walking motor, configured to drive the walking wheels to rotate; a mowing assembly, including a mowing element configured to mow grass; a mowing motor, configured to drive the mowing element to mow grass; the lawn mower can start the walking motor or the mowing motor within 15 seconds when the temperature is greater than or equal to minus 35°C and less than or equal to minus 15°C.

[0019] In some embodiments, the lawn mower further comprises at least one air tank, which is configured to provide an air source for operating the travel motor or the mowing motor.

[0020] In some embodiments, when the gas tank is filled with gas and used to provide a gas source for the operation of the travel motor, the operating time of the lawn mower is greater than or equal to 12 hours.

[0021] In some embodiments, the remaining gas volume of the gas tank is greater than or equal to 20% of the gas tank volume, and when the gas tank is used to provide a gas source for the operation of the mowing motor, the output power of the mowing motor is greater than or equal to 1.5 kW.

[0022] In some embodiments, the volume of the gas storage tank is greater than or equal to 30 L and less than or equal to 60 L.

[0023] In some embodiments, the gas storage tank is a hydrogen tank.

[0024] In some embodiments, the lawn mower is a riding lawn mower or a stand-on lawn mower.

[0025] The present application adopts the following technical solution: a lawn mower, comprising: a frame; a walking wheel group, including walking wheels supporting the frame; a walking motor, configured to drive the walking wheels to rotate; a mowing assembly, including a mowing element configured to mow grass; a mowing motor, configured to drive the mowing element to mow grass; the lawn mower also includes a gas tank and a first battery pack, the gas tank can provide a gas source for the operation of the lawn mower, and the first battery pack can provide electrical energy for the lawn mower.

[0026] In some embodiments, the lawn mower further includes a battery stack, which is connected to the gas tank via a gas delivery pipe, and the battery stack is configured to provide electrical energy to the lawn mower.

[0027] In some embodiments, the gas tank charges the first battery pack through the battery stack.

[0028] In some embodiments, when there is no gas in the gas tank, the first battery pack provides power to the lawn mower.

[0029] In some embodiments, the first battery pack supplies power to the travel motor.

[0030] In some embodiments, the gas tank is configured to provide an air source for the operation of the mowing motor, and the first battery pack is configured to provide electrical energy for the travel motor.

[0031] In some embodiments, the first battery pack is detachable and can power the power tool.

[0032] In some embodiments, the lawn mower further includes a seat, and the gas tank is disposed behind the seat.

[0033] In some embodiments, the lawn mower further includes a steering wheel, and the gas tank is disposed in front of the steering wheel.

[0034] The present application adopts the following technical solution: a lawn mower, comprising: a frame; a walking wheel group, comprising walking wheels supporting the frame; a walking motor, configured to drive the walking wheels to rotate; a mowing assembly, comprising a mowing element configured to mow grass; a mowing motor, configured to drive the mowing element to mow grass; an operating member for a user to operate to control the speed of the walking motor; a controller, controlling the lawn mower according to the state of the operating member; the lawn mower also includes an air tank and an air supply device connected to the air tank, the air tank is configured to provide an air source for the operation of the lawn mower, the air supply device includes a valve configured to control the air supply amount of the air tank, and the controller is configured to control the opening of the valve according to the output signal of the operating member.

[0035] In some embodiments, the controller is configured to control the valve based at least on an angle of the operating member.

[0036] In some embodiments, the gas storage tank is a hydrogen tank.

[0037] In some embodiments, the air supply device supplies air at a rate less than or equal to 400 g / h.

[0038] In some embodiments, the operating member includes a pedal, and the controller is configured to control the valve according to an opening degree of the pedal.

[0039] In some embodiments, the operating member includes a handle, and the controller is configured to control the valve according to a rotation angle of the handle.

[0040] The present application adopts the following technical solution: a lawn mower, comprising: a frame; a walking wheel group, comprising walking wheels supporting the frame; a walking motor, configured to drive the walking wheels to rotate; a mowing component, comprising a mowing element configured to mow grass; a mowing motor, configured to drive the mowing element to mow grass; a driving circuit, configured to drive the walking motor or the mowing motor; a gas tank and a battery stack, the battery stack being configured to be connected to the gas tank and generate current, and configured to power the driving circuit; the lawn mower also includes a sensor component and a switch, the sensor component being configured to detect the status of the battery stack, and when the sensor component detects that the battery stack is abnormal, the switch is disconnected to cut off the circuit that powers the driving circuit.

[0041] In some embodiments, the switch is disposed on the connection circuit between the battery stack and the driving circuit.

[0042] In some embodiments, the gas storage tank is a hydrogen tank.

[0043] In some embodiments, the sensor assembly includes at least one of a temperature sensor, a humidity sensor, and an air pressure sensor.

[0044] The present application adopts the following technical solution: a mobile charger, comprising: a first interface, configured to install a gas tank; a second interface, configured to install a first battery pack; a battery stack, configured to communicate with the gas tank through a gas delivery pipe and generate current; a charging circuit, electrically connected to the battery stack, and the battery stack can charge the first battery pack through the charging circuit.

[0045] In some embodiments, the first battery pack can be detachably connected to the power tool, and the first battery pack can power the power tool.

[0046] In some embodiments, the mobile charger further includes a third interface, which is configured to install a second battery pack, and the battery stack can charge the second battery pack through the charging circuit.

[0047] In some embodiments, the chemistry of the second battery pack is different from the chemistry of the first battery pack.

[0048] In some embodiments, the first battery pack is a ternary lithium battery, and the second battery pack is a lithium iron phosphate battery.

[0049] In some embodiments, the charge rate of the first battery pack and / or the charge rate of the second battery pack is controlled according to the remaining gas amount in the gas storage tank.

[0050] In some embodiments, the lawn mower further includes an air supply device connected to the air tank, the air supply device including a valve configured to control the amount of air supplied by the air tank to the battery stack, and the opening of the valve is controlled according to the charging rate of the first battery pack or the second battery pack.

[0051] In some embodiments, the second interface is disposed adjacent to or opposite to the third interface.

[0052] In some embodiments, the mobile charger also includes an AC power output interface and an inverter circuit. The inverter circuit is electrically connected to the battery stack. The inverter circuit is configured to convert the current generated by the battery stack into AC power and power the AC device through the AC power output interface.

[0053] The present application adopts the following technical solution: a mobile power supply, comprising: a first interface, configured to install a gas tank; a fuel cell stack, configured to communicate with the gas tank through a gas delivery pipe and generate current; an inverter circuit, electrically connected to the fuel cell stack, the inverter circuit is configured to convert the current generated by the fuel cell stack into alternating current; and an AC output interface, configured to power AC equipment.

[0054] In some embodiments, the mobile power supply further includes a DC output interface and a DC power supply circuit, the DC power supply circuit is electrically connected to the battery stack, and the DC power supply circuit is configured to power the DC device through the DC output interface using the current generated by the battery stack.

[0055] In some embodiments, the DC output interface is a USB interface.

[0056] In some embodiments, the AC power output interface is a two-pronged socket or a three-pronged socket.

[0057] In some embodiments, the fuel cell stack includes a positive electrode, a negative electrode, and an electrolyte, and the gas storage tank is connected to the positive electrode of the fuel cell stack through a gas delivery pipe.

[0058] In some embodiments, the gas tank is a hydrogen tank, and the hydrogen in the gas tank can be transported to the positive electrode of the fuel cell stack. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] FIG1 is a schematic structural diagram of a lawn mower provided by the present application;

[0060] FIG2 is another structural schematic diagram of the lawn mower provided by the present application;

[0061] FIG3 is another structural schematic diagram of the lawn mower provided by the present application;

[0062] FIG4 is another structural schematic diagram of the lawn mower provided by the present application;

[0063] FIG5 is a schematic diagram of the structure of the gas storage tank and the fuel cell stack provided by the present application;

[0064] FIG6 is a schematic diagram of the structure of the battery stack and the driving circuit provided by the present application;

[0065] FIG7 is a schematic structural diagram of a first battery pack, a gas storage tank, and a mobile charger provided by the present application;

[0066] FIG8 is a schematic structural diagram of a mobile power supply provided by the present application;

[0067] FIG9 is an electrical schematic diagram of the mobile power supply in FIG8 . DETAILED DESCRIPTION

[0068] Before any embodiments of the present application are explained in detail, it is to be understood that the application is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the foregoing drawings.

[0069] In this application, the terms "comprises," "includes," "has," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0070] In this application, the term "and / or" describes a relationship between related objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Additionally, the character " / " in this application generally indicates that the related objects are in an "and / or" relationship.

[0071] In this application, the terms "connect," "combine," "couple," and "install" may refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, a direct connection refers to two parts or components being connected together without an intermediary, and an indirect connection refers to two parts or components being connected to at least one intermediary, with the two parts or components being connected via the intermediary. Furthermore, "connect" and "couple" are not limited to physical or mechanical connections or couplings and may include electrical connections or couplings.

[0072] In this application, it will be understood by those skilled in the art that relative terms (e.g., "about," "approximately," "substantially," etc.) used in conjunction with quantities or conditions include the values ​​and have the meaning indicated by the context. For example, the relative terms include at least the degree of error associated with the measurement of a specific value, the tolerance caused by manufacturing, assembly, use, etc. associated with a specific value. Such terms should also be considered to disclose a range defined by the absolute values ​​of the two endpoints. Relative terms may refer to plus or minus a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Numerical values ​​that do not use relative terms should also be disclosed as specific values ​​with tolerances. In addition, "substantially" may refer to plus or minus a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) on the basis of the indicated angle when expressing a relative angular position relationship (e.g., substantially parallel, substantially perpendicular).

[0073] In this application, it will be understood by those skilled in the art that the function performed by an assembly can be performed by one assembly, multiple assemblies, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one assembly, or a combination of multiple parts.

[0074] In the present application, the terms "upper", "lower", "left", "right", "front", "back" and other directional words are described based on the orientation and positional relationship shown in the accompanying drawings, and should not be understood as limiting the embodiments of the present application. In addition, in the context, it is also necessary to understand that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to the other element "upper" or "lower", but also be indirectly connected to the other element "upper" or "lower" through an intermediate element. It should also be understood that directional words such as upper side, lower side, left side, right side, front side, back side, etc. not only represent the positive orientation, but can also be understood as the lateral orientation. For example, below can include directly below, lower left, lower right, lower front and lower back, etc.

[0075] In this application, the terms "controller," "processor," "central processing unit," "CPU," and "MCU" are used interchangeably. Where a unit "controller," "processor," "central processing unit," "CPU," or "MCU" is used to perform a particular function, unless otherwise specified, the function may be performed by a single unit or multiple units.

[0076] In this application, the terms "device", "module" or "unit" can be implemented in the form of hardware or software to achieve specific functions.

[0077] In this application, the terms "calculate", "judge", "control", "determine", "identify", etc. refer to the operations and processes of a computer system or similar electronic computing device (e.g., controller, processor, etc.).

[0078] The present application provides an outdoor work machine, which may be a tiller for farming, a fertilizer spreader for spreading fertilizer, a chemical spreader for spreading agricultural chemicals, a harvester for harvesting, a lawn mower for mowing grass, a dumper for turning grass, a rake for raking grass, or a baler for baling grass, as well as an all-terrain vehicle (UTV). In the related art, all-terrain vehicles include four-wheel all-terrain vehicles (ATVs), multi-purpose all-terrain vehicles, and recreational field vehicles. The outdoor work machine is provided with a gas tank, which can provide a power source for the work machine.

[0079] The gas tank is a hydrogen tank, connected to the fuel cell stack via a gas delivery pipe. The gas tank provides hydrogen to the fuel cell stack, which reacts within the stack to generate current, which is used to power the working devices. Using hydrogen fuel cells offers advantages such as fast hydrogen replenishment, zero pollution and emissions, and long battery life. In essence, the fuel cell stack is a device that converts chemical energy into electrical energy.

[0080] The following detailed description uses a lawn mower as an example. Figure 1 shows a riding lawn mower, also known as a zero-radius lawn mower. Figures 2 and 3 show riding lawn mowers, also known as tractor lawn mowers. Figure 4 shows a stand-on lawn mower, which is provided with a standing platform 800 for a person to stand on. As shown in Figures 1, 2, 3, and 4, the lawn mower includes a frame 100, a running wheel assembly 200, a running motor, a mowing assembly, and a mowing motor. The running wheel assembly 200 includes running wheels 201 supporting the frame 100, and the running motor is configured to drive the running wheels 201 to rotate. The mowing assembly includes a mowing element configured to mow grass, and the mowing motor is configured to drive the mowing element to mow grass. The lawn mower also includes at least one gas tank 1, which is mounted on the frame 100 and configured to provide an air source for the operation of the lawn mower. The gas tank 1 is mounted on the frame 100, which has a low center of gravity. The frame 100 has a strong load-bearing capacity and can accommodate a relatively large gas tank 1 while ensuring the stable operation of the lawn mower. In this application, the gas tank 1 is used to power the lawn mower, replacing the lithium battery power supply method in the related art. This solves the problems of slow charging speed, long charging time, and short battery life of lithium batteries, thereby extending the operating time of the lawn mower.

[0081] The gas storage tank 1 in this application can be placed in a closed or open manner. Open placement of the gas storage tank 1 is relatively safer. When the gas storage tank 1 leaks, the gas in the gas storage tank 1 can be directly discharged to the external environment without accumulating around the gas storage tank 1.

[0082] The frame 100 includes a crossbeam 101 and a longitudinal beam 102. The specific connection method of the crossbeam 101 and the longitudinal beam 102 is not limited and can be set according to the actual structure of the lawn mower. The gas tank 1 is parallel to the crossbeam 101 or the longitudinal beam 102 to improve the compactness of the lawn mower structure layout.

[0083] The lawn mower can be a riding lawn mower or a standing lawn mower. If the lawn mower is a riding lawn mower, the lawn mower also includes a seat 300 for the user to sit on the lawn mower to work and operate the lawn mower. At least one gas tank 1 is arranged behind the seat 300, which can balance the front and rear weight of the lawn mower and ensure that the lawn mower can move smoothly. Moreover, being arranged behind the seat 300 will make the structural layout of the lawn mower more compact. In some embodiments, part of the gas tank 1 is arranged behind the seat 300, and gas tanks 1 can also be arranged at other parts of the lawn mower. In some embodiments, the lawn mower also includes a steering wheel 400, and the direction of the lawn mower can be controlled by the steering wheel 400. At least one gas tank 1 is arranged in front of the steering wheel 400, which can balance the front and rear weight of the lawn mower and ensure that the lawn mower can move smoothly.

[0084] As shown in FIG5 , the gas tank 1 is connected to the fuel cell stack 3 , which is connected to the gas tank 1 through the gas delivery pipe 2 . The fuel cell stack 3 is configured to supply power to the lawn mower, and the gas tank 1 is configured to provide gas to the fuel cell stack 3 .

[0085] In some embodiments, the lawn mower has a seat 300, and the battery stack 3 is arranged below the seat 300. Regardless of whether the gas tank 1 is arranged behind the seat 300 or in front of the steering wheel 400, the distance between the battery stack 3 and the gas tank 1 is set close, which shortens the length of the gas delivery pipe 2 connecting the battery stack 3 and the gas tank 1, reduces the distance of gas delivery, and thereby improves the working efficiency of the battery stack 3.

[0086] The above-mentioned arrangement of the gas tank 1 and the battery stack 3 is also applicable to a tiller for farming, a fertilizer spreader for spreading fertilizer, a chemical spreader for spreading agricultural chemicals, a harvester for harvesting, a dumper for turning grass, a rake for raking grass, or a baler for baling grass, and will not be described in detail here.

[0087] In some embodiments, the gas tank 1 is a hydrogen tank configured to store hydrogen, which provides hydrogen to the fuel cell stack to form a hydrogen fuel cell. Hydrogen fuel cells have advantages over lithium batteries, such as fast hydrogen replenishment, zero pollution and zero emissions, and long battery life.

[0088] To improve the mower's endurance, the volume of the gas tank 1 is maximized, taking into account the mower's size, and the number of times the gas tank 1 needs to be inflated is minimized. Therefore, the volume of the gas tank 1 is set to be greater than or equal to 30L and less than or equal to 60L. In some embodiments, 2n gas tanks 1 are provided, symmetrically arranged about the centerline of the rotating shaft connecting the two running wheels 201, where n is a positive integer. An even number of gas tanks 1 are provided, symmetrically arranged on the left and right sides of the mower to balance the mower and ensure stable operation.

[0089] In some embodiments, a cover 500 is provided above the running wheel 201 , and 2n gas tanks 1 are provided on the lower side of the cover 500 , which improves the compactness of the arrangement of the gas tanks 1 and shortens the distance to the battery stack 3 provided under the seat 300 .

[0090] In some embodiments, the lawn mower is provided with two running wheels 201 at the front and two running wheels 201 at the rear. A cover 500 is provided on each running wheel 201. An air tank 1 is provided under each of the rear covers 500. The air tanks 1 under the covers 500 on both sides have the same air storage capacity to ensure balance of the lawn mower. The air storage capacity on both sides of the lawn mower can be achieved by installing the same number of air tanks 1 under the covers 500 on both sides, with the air tanks 1 having the same volume. Alternatively, air tanks 1 of different volumes can be installed under the covers 500 on both sides, with the total air storage capacity on both sides being the same.

[0091] The gas tank 1 can also be arranged on the lower side of the front cover 500 in the same manner as the above-mentioned arrangement of the gas tank 1 on the lower side of the rear cover 500, which will not be described in detail here.

[0092] In some other embodiments, the gas tank 1 is arranged in at least two combinations of: on the lower side of the cover 500 , in front of the steering wheel 400 , and behind the seat 300 , and no specific limitation is made here.

[0093] The gas tank 1 can also be set in odd numbers, and can be set in one or a combination of at least two of the following ways: setting a gas tank 1 on the lower side of the cover 500, setting a gas tank 1 in front of the steering wheel 400, and setting a gas tank 1 behind the seat 300. No details will be given here.

[0094] The lawn mower provided by the present application can start the travel motor or the lawn mowing motor within 15 seconds when the temperature is greater than or equal to -35°C and less than or equal to -15°C. When the temperature is relatively low, the travel motor or the lawn mowing motor can be started in a short time, so that the lawn mower enters the working state. It is suitable for working in low temperature conditions, which improves the working efficiency of the lawn mower. It can be understood that the condition for starting the travel motor or the lawn mowing motor should be understood as the gas tank being able to supply power to the travel motor or the lawn mowing motor so that the travel motor or the lawn mowing motor rotates. In some embodiments, the condition for starting the travel motor or the lawn mowing motor should be understood as the gas tank being able to supply power at 80% of the full power.

[0095] The gas tank 1 installed on the lawn mower is configured to provide a gas source for the running motor or mowing motor of the lawn mower. The gas tank 1 is also configured to supply gas to the fuel cell stack 3, which generates current to power the running motor or mowing motor. This power supply method replaces the battery pack used in related technologies, can normally provide power in lower temperatures, and has higher power efficiency than battery packs. Furthermore, the gas tank 1 stores hydrogen, which is more energy-efficient and environmentally friendly.

[0096] The volume of the gas tank 1 is set to be greater than or equal to 30L and less than or equal to 60L. When the gas tank 1 is full of gas and is used to provide a gas source for the operation of the walking motor, the battery life of the lawn mower is greater than or equal to 12 hours. Compared with the battery pack power supply method, the battery life of the lawn mower is extended, thereby extending the working time of the lawn mower. There is no need for repeated charging, which improves the working efficiency of the lawn mower.

[0097] When the remaining gas volume in the gas tank 1 is greater than or equal to 20% of the volume of the gas tank 1 and the gas tank 1 is used to provide a gas source for the operation of the lawn mower, the output power of the lawn mower is greater than or equal to 1.5Kw, ensuring that the lawn mower can mow normally and with high mowing efficiency.

[0098] Continuing with Figures 1 and 5 , the gas tank 1 is provided with a gas supply device 5, which is configured to provide a gas source for the operation of the lawn mower. The power supply device 5 includes a valve 51 configured to control the gas supply of the gas tank 1. The lawn mower also includes an operating member for the user to operate to control the speed of the travel motor and a controller for controlling the lawn mower according to the state of the operating member. The controller can control the opening of the valve 51 according to the output signal of the operating member 600, thereby controlling the gas supply of the gas tank 1. When the valve 51 is opened widely, the gas supply of the gas tank 1 is large, and the power supply of the battery stack 3 is large; when the valve 51 is opened narrowly, the gas supply of the gas tank 1 is small, and the power supply of the battery stack 3 is small. Gas tank 1 is configured to provide an air source for the lawn mower. Gas supply device 5 is configured as a valve 51 that controls the gas supply from gas tank 1. A user operates operating element 600 to control the speed of the travel motor, thereby controlling the speed of the lawn mower. A controller controls valve 51 based on the output of operating element 600 to control the gas supply from gas tank 1, thereby providing the required power for the lawn mower to operate normally. The gas supply rate of gas supply device 5 is less than or equal to 400 g / h.

[0099] The controller is configured to control the valve 51 at least according to the angle of the operating member 600. If the angle of the operating member 600 is large, it means that the lawn mower requires a large amount of electricity, and the angle of the valve 51 to be opened is increased; on the contrary, if the angle of the operating member 600 is small, it means that the lawn mower requires a small amount of electricity, and the angle of the valve 51 to be opened is decreased.

[0100] In some embodiments, the operating member 600 includes a pedal, and the controller is configured to control the valve 51 according to the opening degree of the pedal, and the user steps on the pedal.

[0101] In some embodiments, the operating member 600 includes a handle, and the controller is configured to control the valve 51 according to the rotation angle of the handle.

[0102] In some embodiments, the controller is configured to control the valve 51 at least according to the displacement of the operating member 600, and the displacement of the operating member 600 is proportional to the opening angle of the valve 51. The larger the displacement of the operating member 600, the larger the opening angle of the valve 51, and the smaller the displacement of the operating member 600, the smaller the opening angle of the valve 51.

[0103] In some embodiments, the operating member 600 includes a dial knob, and when the dial knob is turned, the controller controls the valve 51 according to the displacement generated by the dial knob.

[0104] The controller can also receive a gas detector that detects the amount of gas in gas tank 1. If the gas detector detects that the amount of gas in gas tank 1 is less than a preset value, the controller issues an alarm signal, indicating that the gas storage in gas tank 1 is insufficient and reminding the user to refill gas promptly. Alternatively, the controller controls valve 51 to close, stopping the supply of gas to the fuel cell stack 3, causing the fuel cell stack 3 to stop operating, and the lawn mower to stop operating or switch power to the first battery pack 4.

[0105] In addition to the gas tank 1, the lawn mower can also be provided with a first battery pack 4, as shown in FIG6 , to realize a hybrid power supply mode for the lawn mower. The gas tank 1 can provide power for the lawn mower, and the first battery pack 4 can provide electrical energy for the lawn mower. The gas tank 1 is connected to the battery stack 3 through the gas delivery pipe 2. The gas tank 1 is configured to provide gas to the battery stack 3. The gas reacts in the battery stack 3 to generate current to provide electrical energy for the lawn mower. The lawn mower is provided with a gas tank 1 and a first battery pack 4. The gas tank 1 provides power for the lawn mower, and the first battery pack 4 provides electrical energy for the lawn mower, realizing a hybrid power supply for the lawn mower, improving the endurance of the lawn mower, and extending the working time of the lawn mower.

[0106] The gas tank 1 and the first battery pack 4 can work simultaneously, or can work crosswise, or the gas tank 1 and the first battery pack 4 can respectively power different components of the lawn mower.

[0107] For example, the gas tank 1 is configured to provide air for the mowing motor, and the first battery pack 4 is configured to provide power for the travel motor. Alternatively, the gas tank 1 is configured to provide air for the travel motor, and the first battery pack 4 is configured to provide power for the mowing motor. Alternatively, a priority can be set, with one of the gas tank 1 and the first battery pack 4 providing power first, and the other providing power when power is insufficient.

[0108] When there is no gas in the gas tank 1, the first battery pack 4 provides power to the lawn mower. For example, if the gas tank 1 is providing the gas source for the mowing motor, when there is no gas in the gas tank 1, the first battery pack 4 powers the mowing motor. Alternatively, if the gas tank 1 is providing the gas source for the travel motor, when there is no gas in the gas tank 1, the first battery pack 4 powers the travel motor. Alternatively, if the gas tank 1 is providing power first, when there is no gas in the gas tank 1, the first battery pack 4 powers the lawn mower.

[0109] When the first battery pack 4 is low on power, the gas tank 1 provides the gas source for the lawn mower. For example, if the first battery pack 4 is providing power to the mowing motor, when the first battery pack 4 is low on power, the gas tank 1 provides the gas source for the mowing motor. Alternatively, if the first battery pack 4 is providing power to the travel motor, when the first battery pack 4 is low on power, the gas tank 1 provides the power for the travel motor. Alternatively, if the first battery pack 4 is providing power as a priority, when the first battery pack 4 is low on power, the gas tank 1 provides the gas source for the lawn mower.

[0110] When the gas supply from the gas tank 1 is unstable, the first battery pack 4 supplies power, or a supercapacitor or flywheel energy storage structure is provided to store electrical energy, which can temporarily replace the gas tank 1 to power the lawn mower.

[0111] The gas tank 1 can also charge the first battery pack 4 through the battery stack 3. When the first battery pack 4 is configured to power the entire lawn mower, or to power the mowing motor or travel motor of the lawn mower, if the power of the first battery pack 4 is insufficient, the battery stack 3 can be used to charge the first battery pack 4, thereby extending the endurance of the lawn mower. If the gas tank 1 is also working while the first battery pack 4 is providing power, the battery stack 3 needs to reasonably distribute the gas in the gas tank 1 when charging the first battery pack 4, with a portion of the gas used to charge the first battery pack 4 and the remaining portion used to provide a gas source for the operation of other components on the lawn mower. This ensures that the other components of the lawn mower can function normally while the first battery pack 4 is charged.

[0112] A conversion circuit can be set on the lawn mower. When the mode of charging the first battery pack 4 is selected, the battery stack 3 charges the first battery pack 4 through the conversion circuit 31, and at the same time the battery stack 3 can also power other components of the lawn mower, or the battery stack 3 stops powering other components, and after completing the charging operation of the first battery pack 4, it powers other components.

[0113] The first battery pack 4 is detachable and can power power tools such as handheld tools, backpack tools, and bench tools. When the lawn mower is not in use, the first battery pack 4 can be removed and used for other tools, thereby increasing the utilization rate of the first battery pack 4 and avoiding resource waste.

[0114] The first battery pack 4 and the gas storage tank 1 are provided on the lawn mower, and their positions on the lawn mower need to be arranged reasonably to ensure the balance of the lawn mower and the compactness of the structure.

[0115] If the lawn mower is provided with a seat 300 and the gas tank 1 is positioned behind the seat 300, the first battery pack 4 can be positioned to the left of the seat 300, to the right of the seat 300, below the seat 300, or behind the seat 300, without limitation. The first battery pack 4 can also be positioned elsewhere on the lawn mower.

[0116] If the lawn mower is equipped with a steering wheel 400 and the gas tank 1 is positioned in front of the steering wheel 400, the first battery pack 4 can be positioned to the left of the seat 300, to the right of the seat 300, below the seat 300, in front of the seat 300, or behind the seat 300, without limitation. The first battery pack 4 can also be positioned elsewhere on the lawn mower.

[0117] The lawn mower is equipped with a drive circuit 12 configured to drive a travel motor or a lawn mowing motor. The fuel cell stack 3 is configured to communicate with the gas tank 1 and generate current, and is also configured to power the drive circuit 12. The lawn mower also includes a sensor assembly 61 and a switch 6. The sensor assembly 61 is configured to detect the status of the fuel cell stack 3. When the sensor assembly detects an abnormality in the fuel cell stack 3, the switch 6 is configured to cut off the power supply circuit 12. The sensor assembly can detect whether the fuel cell stack 3 is operating normally. When an abnormality is detected in the fuel cell stack 3, the switch 6 is opened to cut off the power supply circuit 12, protecting the drive circuit 12 and reducing the failure rate of the lawn mower. In some embodiments, the sensor assembly 61 includes at least one of a temperature sensor, a humidity sensor, and an air pressure sensor. When the temperature, humidity, or air pressure of the fuel cell stack 3 does not meet the requirements, it sends a signal indicating that the fuel cell stack 3 is abnormal. The above sensors are used in combination to detect the parameters of the fuel cell stack 3 from multiple aspects to ensure the reliability and safety of the fuel cell stack 3.

[0118] The switch 6 is arranged on the connection circuit between the battery stack 3 and the drive circuit 12. When the sensor component detects that the battery stack 3 has an abnormality, the switch 6 cuts off the connection circuit between the battery stack 3 and the drive circuit 12. The battery stack 3 no longer supplies power to the drive circuit 12, and the walking motor or the mowing motor stops running.

[0119] In some other embodiments, the switch 6 is provided on the gas supply device 5 and is configured to control the opening and closing of the valve 51. When the sensor assembly detects an abnormality in the fuel cell stack 3, the switch 6 controls the valve 51 to close, and the gas tank 1 stops supplying gas to the fuel cell stack 3, thereby stopping power supply to the drive circuit 12.

[0120] Based on the principle of the power supply structure composed of the gas tank 1 and the battery stack 3, as shown in Figure 7, the present application also proposes a mobile charger 700. The mobile charger 700 uses the gas tank 1 and the battery stack as a power source to charge the first battery pack installed on the joint 41. The mobile charger 700 can be installed on a lawn mower. After installation, the mobile charger 700 uses the gas tank 1 on the lawn mower to charge the first battery pack or other battery packs. The mobile charger 700 is detachable from the lawn mower. When the mobile charger 700 is removed, another gas tank is used to charge the battery pack. The other gas tank can be built into the mobile charger 700 or can be placed externally on the mobile charger 700. The external gas tank is connected to the mobile charger 700 through a pipe.

[0121] 8 and 9 , the mobile charger 700a includes a first interface 7, a second interface 8, and a charging circuit 21. The first interface 7 is configured to mount a gas tank 1, the second interface 8 is configured to mount a first battery pack 4, and the battery stack 3 is configured to communicate with the gas tank 1 through a gas delivery tube 2 and generate current. The charging circuit 21 is electrically connected to the battery stack 3, and the battery stack 3 can charge the first battery pack 4 through the charging circuit 21. The power supply system formed by the gas tank 1 and the battery stack 3 can serve as a charging source for the mobile charger 700, has a long battery life, and is energy-saving and environmentally friendly.

[0122] The first battery pack 4 can be installed on the lawn mower and can also be detachably connected to a power tool to power the power tool. The power tool can be a handheld tool, a backpack tool, or a benchtop tool. When the lawn mower is not in use, the first battery pack 4 can be removed and used for other tools, thereby increasing the utilization rate of the first battery pack 4 and avoiding resource waste.

[0123] The mobile charger 700 also includes a third port 9 configured to receive a second battery pack 42. The battery stack 3 can charge the second battery pack 42 via the charging circuit 21. The second battery pack has different chemical properties from the first battery pack 4. This means that the mobile charger 700 provided herein can charge battery packs of different chemical properties, thus providing a wide range of applications.

[0124] The first battery pack 4 is a ternary lithium battery, and the second battery pack 42 is a lithium iron phosphate battery. The first battery pack 4 is smaller and has a lower capacity than the second battery pack 42. Both the first battery pack 4 and the second battery pack 42 can power power tools, with the first battery pack 4 primarily used for handheld power tools and the second battery pack primarily used for vehicle-mounted power tools.

[0125] In the present application, the charge rate of the first battery pack 4 and / or the charge rate of the second battery pack is controlled based on the remaining gas volume in the gas tank 1. It should be noted that to properly allocate the remaining gas volume in the gas tank 1, when charging the first battery pack 4 or the second battery pack 42, the remaining gas volume in the gas tank 1, the operating hours of the first battery pack 4 or the second battery pack 42, and other factors are taken into consideration. It is not necessary to fully charge the first battery pack 4 or the second battery pack 42; it is sufficient to charge the battery pack to meet the usage requirements.

[0126] The gas tank 1 is provided with an indicator configured to indicate the remaining hydrogen level (this may be a specific numerical value, an indicator light, a progress bar, etc.). The mobile charger 700 is provided with an operating element configured to allow the user to select the charge level of the battery pack connected to it for charging. The aforementioned remaining hydrogen level indicator can also be provided on the mobile charger 700. The aforementioned operating element can also be provided on each battery pack. Alternatively, both can be integrated into an external device, such as a mobile phone. The user can set the charging options according to actual operating conditions.

[0127] Gas tank 1 is connected to a gas supply device 5, which includes a valve 51. The opening of valve 51 is controlled based on the charging rate of the first or second battery pack 4. When fast charging or slow charging is selected, valve 51 opens widely, increasing the gas supply rate from gas tank 1. When slow charging is selected, valve 51 opens narrowly, slowing the gas supply rate from gas tank 1.

[0128] In addition, the opening degree of the valve 51 is also related to factors such as the maximum charging power of the first battery pack 4 or the second battery pack, the charging efficiency, and the type of the battery pack.

[0129] The mobile charger 700 also includes an AC power output interface 10 and an inverter circuit. The inverter circuit is electrically connected to the fuel cell stack 3 and is configured to convert the current generated by the fuel cell stack 3 into AC power, which is then used to power AC devices via the AC power output interface 10. The gas tank 1 and the fuel cell stack 3 serve as power sources.

[0130] The second interface 8 and the third interface 9 are arranged adjacent to or opposite to each other. In other embodiments, the second interface 8 and the third interface 9 can be combined into one, that is, one interface can charge the first battery pack 4 and the second battery pack respectively.

[0131] The second interface 8, the third interface 9 and the AC output interface 10 can be arranged on the same side or on different sides, which is not specifically limited here. The number of the first interface 7, the second interface 8, the third interface 9 and the AC output interface 10 is not limited.

[0132] Continuing with reference to Figures 5 and 8, the present application also provides a mobile power supply, which is configured to power other devices, and the power supply uses a power supply structure composed of a gas tank 1 and a battery stack 3. The mobile power supply includes a first interface 7, an inverter circuit and an AC output interface 10. The first interface 7 is configured to install the gas tank 1, and the battery stack 3 is configured to ventilate with the gas tank 1 through the gas delivery pipe 2 and generate current. The inverter circuit is electrically connected to the battery stack 1, and the inverter circuit is configured to convert the current generated by the battery stack 3 into AC power, and output it through the AC output interface 10 to power the AC device. The inverter circuit can convert the current generated by the battery stack 3 into AC power, and output it through the AC output interface 10 to power the AC device. The gas tank 1 provides gas to the battery stack so that the battery stack 3 generates current. The power supply system formed by the gas tank 1 and the battery stack 3 can serve as the power supply of the mobile power supply, has a long battery life, and is energy-saving and environmentally friendly.

[0133] The AC output interface 10 is a two-pin socket or a three-pin socket. Alternatively, two AC output interfaces 10 are provided, one of which is a two-pin socket and the other is a three-pin socket.

[0134] The mobile power supply also includes a DC output interface 11 and a DC power supply circuit. The DC power supply circuit is electrically connected to the battery stack 3. The DC power supply circuit is configured to power the DC device through the DC output interface 11 using the current generated by the battery stack 3.

[0135] The DC output interface 11 may be a USB interface or a Type-C interface, which is not specifically limited here.

[0136] The mobile power supply can be combined with the mobile charger to form a device that can not only supply power to external devices but also charge the battery pack.

[0137] The aforementioned stack 3 includes a positive electrode, a negative electrode, and an electrolyte. A gas tank 1 is connected to the positive electrode of the stack 3 via a gas delivery pipe 2. The gas within the tank 1 is delivered to the positive electrode. The gas reacts with the electrolyte to generate an electric current. The gas within the tank 1 is hydrogen. This hydrogen is delivered to the positive electrode, where it reacts with the electrolyte to produce water. This water can be recycled and reused to cool the stack, achieving water-cooling and energy conservation. The water produced by the reaction of hydrogen with the electrolyte can also be used to humidify the stack.

[0138] The heat dissipation of the stack 3 can also be carried out by air cooling, specifically by using a fan to dissipate the heat of the stack 3. Alternatively, antifreeze coolant can be used to dissipate the heat of the stack 3.

[0139] When the stack 3 operates in a low-temperature environment, heating is required to improve the power supply efficiency of the stack 3 and prevent the water generated by the reaction of hydrogen and electrolyte from freezing, which would affect the normal operation of the stack 3. A heating device can be provided on the stack 3 to heat the stack 3 or to collect heat generated by the stack 3 during operation, without specific limitations.

[0140] In order to improve the safety of the battery stack 3, when the battery stack 3 is installed on a lawn mower or other equipment, a shock absorber is provided on the battery stack 3. The shock absorber can play a role in buffering and shock absorption, thereby preventing the safety and working stability of the battery stack 3 from being affected by factors such as bumps.

[0141] The aforementioned gas tank 1 stores hydrogen, and the gas pressure of the gas tank is greater than or equal to 25 MPa and less than or equal to 80 MPa. When the gas pressure in the gas tank 1 is 35 MPa, the hydrogen density is 23 kg / m3, and the hydrogen content in the gas tank 1 is 1380 g. If the gas pressure in the gas tank 1 is 70 MPa, the hydrogen content in the gas tank 1 is 2760 g. The gas tank 1 specifically stores hydrogen in various ways, including high-pressure gaseous hydrogen storage, cryogenic liquid hydrogen storage, organic liquid hydrogen storage, and mortgaged solid-state hydrogen storage. In this application, one of these hydrogen storage methods can be selected, and no specific limitation is imposed herein.

[0142] Currently, hydrogen can be obtained through hydrogen refueling stations, hydrogen production equipment, or shared hydrogen tanks. Hydrogen refueling stations offer advantages such as fast refueling, no need for in-house hydrogen production equipment, low startup costs, and the ability to store hydrogen under pressure, resulting in a high energy density. Hydrogen production equipment offers advantages such as home-made production and ease of use. Shared hydrogen tanks allow hydrogen tanks refueled at hydrogen refueling stations to be transported to a convenient location, allowing users to exchange or obtain hydrogen from shared tanks.

[0143] The above shows and describes the basic principles, main features and advantages of this application. Those skilled in the art should understand that the above embodiments do not limit this application in any form, and any technical solutions obtained by equivalent replacement or equivalent transformation fall within the scope of protection of this application.

Claims

1. A lawn mower, comprising: Frame; A running wheel assembly, comprising running wheels supporting the frame; A travel motor is configured to drive the travel wheel to rotate; a mowing assembly including a mowing element configured to mow grass; a mowing motor configured to drive the mowing element to mow grass; At least one gas tank is installed on the frame, and the gas tank is configured to provide a gas source for the operation of the lawn mower.

2. The lawn mower according to claim 1, wherein: The lawn mower is a riding lawn mower, and the lawn mower further comprises a seat, and at least one gas storage tank is arranged behind the seat.

3. The lawn mower according to claim 1, further comprising a steering wheel, wherein at least one of the gas tanks is disposed in front of the steering wheel. 4 . The lawn mower according to claim 1 , further comprising a battery stack, wherein the battery stack is connected to the gas tank via a gas delivery pipe, and the battery stack is configured to supply power to the lawn mower.

5. The lawn mower according to claim 4, wherein: The lawn mower is a riding lawn mower, and the lawn mower also includes a seat, and the battery stack is arranged under the seat.

6. The lawn mower according to claim 1, wherein: The volume of the gas storage tank is greater than or equal to 30L and less than or equal to 60L.

7. The lawn mower according to claim 1, wherein: There are 2n air storage tanks, and the 2n air storage tanks are symmetrically arranged with the center line of the rotating shaft connecting the two walking wheels as the center, wherein n is a positive integer.

8. The lawn mower according to claim 7, wherein: A covering piece is provided above the traveling wheel, and the gas storage tank is arranged on the lower side of the covering piece disposed at the rear.

9. The lawn mower according to claim 1, wherein: The gas storage tank is a hydrogen tank.

10. The lawn mower according to claim 1, wherein: The vehicle frame comprises a crossbeam and a longitudinal beam, and the gas storage tank is parallel to the crossbeam or the longitudinal beam.

11. The lawn mower according to claim 1 further comprises a travel motor configured to drive the travel wheel to rotate; when the temperature of the lawn mower is greater than or equal to minus 35 degrees Celsius and less than or equal to minus 15 degrees Celsius, the travel motor or the mowing motor can be started within 15 seconds.

12. The lawn mower according to claim 11 further includes an operating member for a user to operate to control the rotational speed of the travel motor and a controller for controlling the lawn mower according to the state of the operating member; the lawn mower further includes an air supply device connected to the air tank and a valve configured to control the air supply amount of the air supply device; the controller is configured to control the valve at least according to the angle of the operating member.

13. The lawn mower according to claim 4, further comprising a sensor assembly and a switch, wherein the sensor assembly is configured to detect a state of the battery stack, and when the state of the battery stack is abnormal, the switch is disconnected.

14. The lawn mower according to claim 13, further comprising a drive circuit configured to drive the travel motor or the mowing motor; the switch is arranged between the battery stack and the drive circuit.

15. The lawn mower of claim 1, further comprising a battery pack, wherein the gas tank and the battery pack are configured to simultaneously provide electrical energy to the lawn mower.

16. A lawn mower comprising: Frame; A running wheel assembly, comprising running wheels supporting the frame; A travel motor is configured to drive the travel wheel to rotate; a mowing assembly including a mowing element configured to mow grass; a mowing motor configured to drive the mowing element to mow grass; as well as The controller is configured to control the travel motor or the mowing motor to start within 15 seconds when the ambient temperature is greater than or equal to minus 35 degrees Celsius and less than or equal to minus 15 degrees Celsius. 17 . The lawn mower according to claim 16 , further comprising at least one air tank, wherein the air tank is configured to provide an air source for the operation of the travel motor or the lawn mowing motor.

18. The lawn mower according to claim 17, wherein: When the gas storage tank is filled with gas and is used to provide a gas source for the operation of the travel motor, the battery life of the lawn mower is greater than or equal to 12 hours.

19. The lawn mower according to claim 17, wherein: The remaining gas volume of the gas tank is greater than or equal to 20% of the volume of the gas tank, and when the gas tank is used to provide a gas source for the operation of the lawn mower motor, the output power of the lawn mower motor is greater than or equal to 1.5 kW.

20. The lawn mower of claim 17, wherein: The volume of the gas storage tank is greater than or equal to 30L and less than or equal to 60L.

21. The lawn mower of claim 17, wherein: The gas storage tank is a hydrogen tank.

22. The lawn mower of claim 16, wherein: The lawn mower is a riding lawn mower or a standing lawn mower.

23. A lawn mower comprising: Frame; A running wheel assembly, comprising running wheels supporting the frame; A travel motor is configured to drive the travel wheel to rotate; a mowing assembly including a mowing element configured to mow grass; a mowing motor configured to drive the mowing element to mow grass; A gas storage tank and a first battery pack, wherein the gas storage tank can provide a gas source for the operation of the lawn mower, and the first battery pack can provide electrical energy for the lawn mower. 24 . The lawn mower according to claim 23 , further comprising a battery stack, wherein the battery stack is connected to the gas tank through a gas delivery pipe, and the battery stack is configured to provide electrical energy to the lawn mower.

25. The lawn mower of claim 24, wherein: The gas tank charges the first battery pack through the battery stack.

26. The lawn mower of claim 23, wherein: When there is no gas in the gas storage tank, the first battery pack provides electrical energy for the lawn mower.

27. The lawn mower of claim 26, wherein: The first battery pack supplies power to the travel motor.

28. The lawn mower of claim 23, wherein: The gas tank is configured to provide a gas source for the operation of the lawn mowing motor, and the first battery pack is configured to provide electrical energy for the travel motor.

29. The lawn mower of claim 23, wherein: The first battery pack is detachable and can supply power to the electric tool.

30. The lawn mower according to claim 23, further comprising a seat, wherein the gas tank is disposed behind the seat.

31. The lawn mower according to claim 23, further comprising a steering wheel, wherein the air tank is disposed in front of the steering wheel.

32. A lawn mower comprising: Frame; A running wheel assembly, comprising running wheels supporting the frame; A travel motor is configured to drive the travel wheel to rotate; a mowing assembly including a mowing element configured to mow grass; a mowing motor configured to drive the mowing element to mow grass; An operating member, for a user to operate to control the speed of the travel motor; a controller for controlling the lawn mower according to the state of the operating member; An air tank and an air supply device connected to the air tank, wherein the air tank is configured to provide an air source for the operation of the lawn mower, the air supply device includes a valve configured to control the air supply amount of the air tank, and the controller is configured to control the opening of the valve according to the output signal of the operating member.

33. The lawn mower of claim 32, wherein: The controller is configured to control the valve at least according to an angle of the operating member.

34. The lawn mower of claim 32, wherein: The gas storage tank is a hydrogen tank.

35. The lawn mower of claim 32, wherein: The air supply speed of the air supply device is less than or equal to 400 g / hour.

36. The lawn mower of claim 32, wherein: The operating member includes a pedal, and the controller is configured to control the valve according to an opening degree of the pedal.

37. The lawn mower of claim 32, wherein: The operating member includes a handle, and the controller is configured to control the valve according to a rotation angle of the handle.

38. A lawn mower comprising: Frame; A running wheel assembly, comprising running wheels supporting the frame; A travel motor is configured to drive the travel wheel to rotate; a mowing assembly including a mowing element configured to mow grass; a mowing motor configured to drive the mowing element to mow grass; A driving circuit configured to drive the walking motor or the mowing motor; A gas tank and a battery stack, wherein the battery stack is configured to communicate with the gas tank and generate current, and is configured to supply power to the drive circuit; A sensor component and a switch, wherein the sensor component is configured to detect the state of the battery stack, and when the sensor component detects that the battery stack is abnormal, the switch is configured to cut off the circuit that supplies power to the drive circuit.

39. The lawn mower of claim 38, wherein: The switch is arranged on a connection circuit between the battery stack and the driving circuit.

40. The lawn mower of claim 38, wherein: The gas storage tank is a hydrogen tank.

41. The lawn mower of claim 38, wherein: The sensor assembly includes at least one of a temperature sensor, a humidity sensor, and an air pressure sensor.

42. A mobile charger, comprising: A first interface is configured to mount a gas tank; A second interface is configured to install a first battery pack; A fuel cell stack configured to communicate with the gas storage tank through a gas delivery pipe and generate electric current; A charging circuit is electrically connected to the battery stack, and the battery stack can charge the first battery pack through the charging circuit.

43. The mobile charger according to claim 42, wherein: The first battery pack can be detachably connected to the electric tool, and the first battery pack can supply power to the electric tool.

44. The mobile charger according to claim 42, further comprising a third interface, wherein the third interface is configured to install a second battery pack, and the battery stack can charge the second battery pack through the charging circuit.

45. The mobile charger according to claim 44, wherein: The chemistry of the second battery pack is different from the chemistry of the first battery pack.

46. ​​The mobile charger according to claim 45, wherein: The first battery pack is a ternary lithium battery, and the second battery pack is a lithium iron phosphate battery.

47. The mobile charger according to claim 44, wherein: At least one of the charge rate of the first battery pack and the charge rate of the second battery pack is controlled according to the remaining gas amount in the gas storage tank.

48. The mobile charger according to claim 44 further includes a gas supply device connected to the gas tank, the gas supply device includes a valve, the valve is configured to control the amount of gas supplied by the gas tank to the battery stack, and the opening of the valve is controlled according to the charging rate of the first battery pack or the second battery pack.

49. The mobile charger according to claim 44, wherein: The second interface is arranged adjacent to or opposite to the third interface.

50. The mobile charger according to claim 42 further includes an AC power output interface and an inverter circuit, wherein the inverter circuit is electrically connected to the battery stack, and the inverter circuit is configured to convert the current generated by the battery stack into AC power and power an AC device through the AC power output interface.

51. A mobile power source, comprising: A first interface is configured to mount a gas tank; A fuel cell stack configured to communicate with the gas storage tank through a gas delivery pipe and generate electric current; An inverter circuit is electrically connected to the battery stack, and the inverter circuit is configured to convert the power generated by the battery stack The electric current is converted into alternating current; The AC power output interface is configured to supply power to an AC device.

52. The mobile power supply according to claim 51 further includes a DC output interface and a DC power supply circuit, wherein the DC power supply circuit is electrically connected to the battery stack, and the DC power supply circuit is configured to power a DC device through the DC output interface using the current generated by the battery stack.

53. The mobile power source according to claim 52, wherein: The DC output interface is a Universal Serial Bus (USB) interface.

54. The mobile power source according to claim 51, wherein: The AC power output interface is a two-pin socket or a three-pin socket.

55. The mobile power source according to claim 51, wherein: The battery stack includes a positive electrode, a negative electrode and an electrolyte, and the gas storage tank is connected to the positive electrode of the battery stack through the gas delivery pipe.

56. The mobile power source according to claim 55, wherein: The gas tank is a hydrogen tank, and the hydrogen in the gas tank can be transported to the positive electrode of the fuel cell stack.

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