CN218677216U - Hydrogen fuel forklift - Google Patents
Hydrogen fuel forklift Download PDFInfo
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- CN218677216U CN218677216U CN202222260847.6U CN202222260847U CN218677216U CN 218677216 U CN218677216 U CN 218677216U CN 202222260847 U CN202222260847 U CN 202222260847U CN 218677216 U CN218677216 U CN 218677216U
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- forklift
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Abstract
The utility model discloses a hydrogen fuel forklift, which comprises a fuel cell cooling liquid circulation loop, a temperature sensor for monitoring the temperature of the fuel cell cooling liquid circulation loop, a fuel cell and a heater for heating the fuel cell; the auxiliary power battery is provided with a cooling pipeline; an input pipe connecting the cooling line to the fuel cell coolant circulation loop; an output pipe connecting the cooling line to the fuel cell coolant circulation loop. The utility model provides a under low temperature operational environment, the unable normal outage that retrieves feedback current and lead to of auxiliary power battery is stopped and the problem of fork truck cold start time overlength.
Description
Technical Field
The present application relates to a hydrogen fuel forklift.
Background
In recent years, hydrogen fuel cell technology has been rapidly advanced, and the hydrogen fuel cell technology has started to enter the material handling field, so that hydrogen fuel forklifts have come into operation. The hydrogen fuel forklift is different from a traditional internal combustion engine forklift, an auxiliary power battery or a lead-acid battery forklift, the hydrogen fuel battery is mostly adopted as main output power, the auxiliary power battery assists in outputting large current instantly to match high power requirements of the forklift such as lifting, climbing and the like, and when the forklift brakes or goes down a slope, the auxiliary power battery can recover feedback reverse charging current of the forklift. The hydrogen fuel forklift is different from a hydrogen fuel passenger vehicle and a commercial vehicle, and brake feedback current cannot be digested and absorbed through a resistive resistor and can only be fed back to an auxiliary power battery. Since the auxiliary power battery is low in power, the upper limit value of the charging current that can be received is also low. When the forklift works at a low temperature (less than 0 ℃), the charging efficiency of the auxiliary power battery is reduced, and the receivable charging current is lower than the feedback current, so that the auxiliary power battery cannot normally receive the feedback current, the power failure is caused, the forklift stops, and the forklift cannot be normally used.
The auxiliary power battery commonly used for matching the hydrogen fuel forklift mostly adopts a heating film to carry out cold start heating, and the heating power is low, so that the heating time is long. In cold areas in the north in winter, the hydrogen fuel forklift usually works at a temperature below zero ℃, and the heating time required by the auxiliary power battery is too long, so that the normal cold start time is too long and far exceeds the acceptable time in operation.
Chinese patent publication CN108808035A discloses a power system of a fuel cell vehicle capable of cold starting at an ultra-low temperature, wherein an embodiment discloses a method for heating an auxiliary power cell by arranging an exhaust gas heat preservation pipe outside the auxiliary power cell, and the main action principle of the method is to heat the auxiliary power cell by using high-temperature exhaust gas generated by the fuel cell through the exhaust gas heat preservation pipe. However, at the time of cold start, it takes time for the fuel cell to start operating sufficiently and to generate exhaust gas for heating, and the heating time of the auxiliary power cell cannot be shortened effectively.
SUMMERY OF THE UTILITY MODEL
In view of this, the present application provides a hydrogen fuel forklift, which can shorten the heating time of the auxiliary power battery.
In order to solve the above problem, the present application provides a hydrogen fuel forklift including: a fuel cell coolant circulation loop, a fuel cell and a heater for heating the fuel cell; an auxiliary power battery on which a cooling pipeline is installed; an input pipe connecting the cooling line to the fuel cell coolant circulation loop; an output pipe connecting the cooling line to the fuel cell coolant circulation loop.
By adopting the structure, the auxiliary power battery is additionally provided with the cooling pipeline, and the input pipe and the output pipe are connected to the fuel battery cooling liquid circulation loop. Therefore, the auxiliary power battery can be heated by the heater through the cooling pipeline arranged on the auxiliary power battery, so that the auxiliary power battery can be rapidly heated, and the heating time of the auxiliary power battery can be shortened.
Specifically, the conventional auxiliary power battery is provided with a heating film for heating, the power of the heating film is generally 100 watts, the power is low, and the heating is slow. The heater is used for heating the fuel cell, so that the power is far greater than that of the heating film, and the heating time can be shortened by using the heater for heating the auxiliary power cell.
As a possible realization, solenoid valves are installed in both the input pipe and the output pipe.
With the above possible implementation manner, the electromagnetic valves in the input pipe and the output pipe close the circulation loop connected to the auxiliary power battery when the temperature of the auxiliary power battery is too high, so that the auxiliary power battery stops heating. Therefore, the auxiliary power battery is ensured to work at a reasonable temperature, and the problem of power failure and parking caused by the fact that the auxiliary power battery cannot normally recover feedback current generated during braking at a low temperature is solved.
Correspondingly, if no solenoid valve is installed in the output pipe or the input pipe, that is, only one solenoid valve is installed, the auxiliary power battery cannot be isolated from the fuel cell coolant circulation loop, so that heating is not stopped, and the working temperature of the auxiliary power battery exceeds a reasonable working temperature, so that the auxiliary power battery is unstable in working, that is, the hydrogen fuel forklift is powered off and stops due to the fact that feedback current generated during braking cannot be normally recovered.
As one possible implementation, the hydrogen-fueled forklift further includes: a temperature sensor for detecting a temperature of the fuel cell coolant circulation circuit; a pump provided in the fuel cell coolant circulation circuit; a control device electrically connected to the fuel cell, the auxiliary power cell, the pump, the temperature sensor, and the electromagnetic valve.
With the above possible implementation manner, the control device is electrically connected to the fuel cell, the auxiliary power cell, the pump, the temperature sensor, and the electromagnetic valve, so that the control device can directly control or receive signals from the above components. So that the control of the hydrogen fuel forklift is simple and convenient.
As one possible implementation, the auxiliary power battery is connected in parallel with the heater. The heater may comprise a PTC heater.
With the above possible implementation, the auxiliary power cell is connected in parallel with the heater, that is, the radiator, the heater and the auxiliary power cell are connected in parallel and are connected in series with the fuel cell. The auxiliary power battery is connected with the heater in parallel, so that the auxiliary power battery is added into the fuel cell cooling liquid circulation loop, meanwhile, the connection structure between the fuel cell and the heater is not damaged, the heater can normally heat the fuel cell, and the hydrogen fuel forklift can stably operate. In addition, the auxiliary power battery and the heater are connected in parallel and are connected in series with the fuel battery, the series connection mode is favorable for circulation of cooling liquid between the fuel battery and the auxiliary power battery, and the fuel battery can better heat the auxiliary power battery.
As a possible implementation, the auxiliary power battery comprises a lithium battery, on which a heating film is also mounted.
With the implementation as possible, the auxiliary power battery can be heated simultaneously with the heater and the heating film, so that the heating time can be further shortened.
As one possible implementation, when the control device receives a signal for activating the hydrogen fuel forklift and the temperature detected by the temperature sensor is less than a first threshold value, the control device operates the pump, heats the heater, and opens the solenoid valves in the input pipe and the output pipe.
With the above possible implementation, the hydrogen fuel forklift may use the heater to heat the fuel cell and the auxiliary power cell simultaneously when the temperature is lower than the first threshold. The cold start of the hydrogen-fueled forklift may be accelerated.
As one possible implementation, the control device starts the fuel cell and turns off the heater when the temperature detected by the temperature sensor is greater than a second threshold, which is greater than the first threshold.
With the above possible implementation manner, the hydrogen fuel forklift may end the operation of the heater when the temperature is greater than the second threshold value, and continue to heat the auxiliary power battery by using the self-heating of the fuel battery after the fuel battery is started. The fuel cell has higher self-heating power, so the auxiliary power cell can be heated more efficiently, the intervention time of the heater is reduced, and the energy consumption of the heater is reduced.
As a possible implementation, the control device closes the electromagnetic valves in the input pipe and the output pipe when the temperature of the auxiliary power battery is greater than a third threshold, wherein the third threshold is greater than the second threshold.
With the above possible implementation manner, the hydrogen fuel forklift may cut off the passage between the auxiliary power battery and the fuel cell coolant circulation circuit when the temperature is greater than the third threshold value, so that the heating of the auxiliary power battery by the fuel cell is stopped. The temperature of the auxiliary power battery can be prevented from continuously rising and exceeding the optimal working temperature of the auxiliary power battery, so that the hydrogen fuel forklift can stably run.
As one possible implementation, the hydrogen-fueled forklift is allowed to start (be able to travel or perform a lifting action) when the auxiliary power cell temperature is greater than the third threshold, that is, the travel or lifting action of the hydrogen-fueled forklift is conditioned on the auxiliary power cell temperature being greater than the third threshold. Therefore, the power-off stop caused by the fact that the auxiliary power battery cannot normally recover the feedback current under the low-temperature working environment can be effectively restrained.
Drawings
The various technical features of the present application and the relationship between them are further explained below with reference to the drawings. The drawings are exemplary, some technical features are not shown in actual scale, and some technical features that are commonly used in the technical field of the present application and are not essential to understanding and implementing the present application may be omitted or additionally shown, that is, the combination of the technical features shown in the drawings is not used for limiting the present application. In addition, the same reference numerals are used throughout the present application to designate the same elements. The specific drawings are illustrated as follows:
FIG. 1 is a schematic diagram of the prior art;
fig. 2 is a schematic view of a hydrogen-fueled forklift to which the first embodiment relates;
fig. 3 is a schematic view of a hydrogen fuel forklift according to a second embodiment.
Description of reference numerals: 1-fuel cell coolant circulation loop; 2-a three-way valve; 3A, 3B-temperature sensors; 4-a pressure sensor; 5, a water pump; 6-a radiator; 7-a heater; 8-an auxiliary power battery; 9A, 9B-solenoid valves; 10-a fuel cell; 11-an input tube; 12-output pipe.
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.
Detailed Description
Hereinafter, specific embodiments of the present application will be described in detail with reference to the drawings.
Unless defined otherwise, all technical and scientific terms used throughout this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. In the event of inconsistencies, the meanings explained throughout this application or those derived from the content reported throughout this application shall prevail. In addition, the terminology used in the description is for the purpose of describing the embodiments of the present application only and is not intended to be limiting of the present application.
The structure of the hydrogen fuel forklift according to the first embodiment of the present application will be described with reference to fig. 2.
The hydrogen fuel forklift includes a control device, a fuel cell 10, a heater 7, a pump 5, an auxiliary power battery 8, and a radiator 6. The heater 7, the pump 5 and the fuel cell 10 are connected in sequence by pipes to form a coolant circulation circuit, i.e., the fuel cell coolant circulation circuit 1. Under the drive of the pump 5, the coolant in the fuel cell coolant circulation circuit flows from the heater 7 to the fuel cell 10 and flows back to the heater 7, so that the fuel cell 10 can be heated by the heater 7. As shown in fig. 2, the auxiliary power cell 8 is connected in parallel with the heater 7 through an input pipe 11 and an output pipe 12, so that, when the fuel cell 10 is heated by the heater 7, the coolant heated by the heater 7 can flow through the auxiliary power cell 8 to heat it.
Throughout this application, "parallel" and "series" refer to "parallel" and "series" of coolant passages, unless otherwise specified.
In the present embodiment, the heater 7 is, for example, a PTC (Positive Temperature Coefficient) heater.
In the present embodiment, the coolant is, for example, an antifreeze coolant, and for example, an antifreeze agent, an additive, or the like may be added to water, and in this case, the coolant circulation circuit may also be referred to as a water path.
In this embodiment, the heat sink, the heater and the lithium battery are connected in parallel and in series with the fuel cell.
In the present embodiment, the auxiliary power battery 8 is equipped with a battery temperature management system, and a temperature sensor electrically connected thereto; the temperature sensor is used for detecting the temperature of the lithium battery 8; in this embodiment, the lithium battery 8 is also mounted with a heating film.
The auxiliary power battery 8 is a power battery for supplying auxiliary power when the hydrogen fuel forklift is lifting or climbing.
In addition, in the present embodiment, the auxiliary power battery 8 is also a starting battery for supplying electric power to the hydrogen fuel forklift at the time of starting, that is, the auxiliary power battery 8 is a power supply battery for the heater 7 and a power supply battery for self-heating the membrane.
As a specific structure, for example, a cooling pipeline is installed on the auxiliary power battery, the cooling pipeline receives the cooling liquid from the fuel cell cooling liquid circulation loop 1 through the input pipe 11, and after heating the auxiliary power battery, the cooling liquid is returned to the fuel cell cooling liquid circulation loop 1 through the output pipe 12 for circulation. In the process, the auxiliary power battery 8 exchanges heat with the cooling pipeline to complete the heating action of the auxiliary power battery, so that the auxiliary power battery can quickly reach a proper working temperature to shorten the time required by heating.
As shown in fig. 2, the solenoid valves 9A and 9B installed in the input pipe 11 and the output pipe 12 can control the on/off states of the input pipe 11 and the output pipe 12. Since the operating temperature of the fuel cell is high, the temperature of the fuel cell coolant circulation circuit 1 is usually around 70 degrees celsius when the fuel cell is operating normally, which is much higher than the normal operating temperature of the auxiliary power cell 8. Therefore, when the auxiliary power battery 8 reaches the proper temperature, i.e. the third threshold of the present embodiment, which is 10 degrees celsius in the present embodiment, the control device receives the temperature signal of the battery temperature management system of the auxiliary power battery 8, and controls the electromagnetic valves 9A and 9B to close simultaneously to cut off the connection between the auxiliary power battery 8 and the fuel cell coolant circulation loop 1, so as to keep the auxiliary power battery 8 at the proper working temperature. The specific switching logic is explained in detail below.
In addition, the selected electromagnetic valve is preferably made of a material with low ion precipitation, and can normally work under the pressure of 101kPa and the temperature of 80 ℃ without leakage.
As shown in fig. 2, the radiator 6 is connected in parallel to the heater 7 via a pipe, and the branch of the radiator 6 is connected to the pipe between the heater 7 and the fuel cell 10 via a three-way valve 2, and the three-way valve 2 switches the on/off states of the branch of the radiator 6 and the branch of the heater 7 so that the coolant flowing out of the fuel cell 10 flows alternatively into the heater 7 or the radiator 6. When the branch in which the heater 7 is located is shut off by the three-way valve 2 and the branch in which the radiator 6 is located is turned on, the radiator 6 can radiate heat to the fuel cell 10.
As shown in fig. 2, the hydrogen fuel forklift is equipped with a first temperature sensor 3A and a second temperature sensor 3B at the input and output ends of the coolant circulation circuit of the fuel cell 10, respectively. When the coolant flows into and out of the fuel cell 10, the two temperature sensors 3A, 3B detect and send temperature signals to the control device of the hydrogen fuel forklift, respectively, and provide signal basis for the control device to send a control command.
Further, the hydrogen fuel forklift includes a control device electrically connected to the electromagnetic valves 9A, 9B, the three-way valve 2, the temperature sensors 3A, 3B, the pump 5, the auxiliary power battery 8, the heater 7, the fuel cell 10, and the radiator 6, respectively, and capable of communicating with these devices or sending control commands thereto. The Control device may be configured by, for example, an Electronic Control Unit (ECU), and may be one ECU or include a plurality of ECUs.
The hydrogen-fueled forklift further includes a power motor that receives electric power from the fuel cell 10 and can drive wheels to rotate to drive the hydrogen-fueled forklift, or drive the forks to move to lift or lower the load.
For example, when the hydrogen fuel forklift performs high-power-demand operations such as lifting and climbing, the auxiliary power battery 8 also supplies power to the power motor, so that the output power of the power motor is increased, and the hydrogen fuel forklift can reliably perform operations such as lifting and climbing.
When the hydrogen-fueled forklift is going downhill, braking, or the like, the power motor is driven in reverse by the wheels and used as a generator, and the generated electric power is transmitted to the auxiliary power battery 8 to charge the auxiliary power battery 8.
The following describes the operation of the hydrogen fuel forklift at the start-up:
it should be noted that the following description will be made only of the action when the hydrogen fuel forklift is cold started at a temperature of, for example, less than 0 degrees celsius (first threshold value). In addition, it is to be understood that the actions described below are performed under the control of a control device.
Pressing a starting button of the hydrogen fuel forklift; the temperature sensors 3A and 3B are started and send temperature signals to the control device; the control device sends an activation signal to the pump 5, the heater 7 and the three-way valve 2 (in the present embodiment, the control is performed based on the signal of the temperature sensor 3A, and as another embodiment, the control may be performed based on the signal of the temperature sensor 3B); the pump 5 and the heater 7 are started, and the three-way valve 2 opens the passage between the heater 7 and the fuel cell 10; circulating the coolant through the heater 7, the fuel cell 10, and the auxiliary power cell 8 via the drive of the pump 5, the fuel cell 10 and the auxiliary power cell 8 simultaneously starting to be heated; when the control device receives that the temperature signal of the temperature sensor 3A is greater than a second threshold (for example, 5 ℃), the control device starts the fuel cell 10, and in addition, can also send a shutdown signal to the heater 7 to stop the heater 7 from heating; at this time, the fuel cell 10 generates a large amount of heat due to work so as to continuously heat the auxiliary power cell 8, and the self-heating power of the fuel cell is higher, so that the heating efficiency of the auxiliary power cell is higher, the intervention time of the heater is reduced, and the energy consumption of the heater is reduced; the temperature sensor of the auxiliary power battery transmits a real-time temperature signal of the auxiliary power battery to the control device through a battery management system of the auxiliary power battery, when the control device detects that the temperature signal is greater than a third threshold (for example, 10 degrees centigrade), a closing signal is sent to the electromagnetic valves 9A and 9B, so that the electromagnetic valves 9A and 9B are closed, the lithium battery 8 stops being heated, and meanwhile, a signal can be sent to the three-way valve 2 and the radiator 6, a passage of the radiator 6 is opened, and the radiator 6 is started, so that cooling liquid flows between the radiator 6 and the fuel battery 10 in a circulating mode.
Optionally, if the temperature of the auxiliary power battery 8 falls below 10 ℃, the control device sends an opening signal to the electromagnetic valves 9A and 9B to open the electromagnetic valves 9A and 9B; at the same time the control device sends a signal to the three-way valve 2 to open the passage between the heater 7 and the fuel cell 10. Thereby heating the auxiliary power battery.
With the first embodiment described above, the auxiliary power battery 8 is simultaneously heated using a heater having a higher efficiency than the heating film (the power of the heating film is about 100 w), and the temperature of the auxiliary power battery 8 can be rapidly raised. Further, the problem of power failure and stoppage due to failure of the auxiliary power battery 8 to normally recover the feedback current can be suppressed. Furthermore, the hydrogen fuel fork truck that this application provided has simple structure and characteristics with low costs.
Fig. 3 shows a second embodiment of the present application. The difference from the first embodiment is: the auxiliary power battery 8 is connected in series with the heater 7 through a coolant circulation circuit, and is connected in parallel with the fuel cell 10; and the three-way valve 2 no longer controls the heating cycle of the auxiliary power battery 8. The actual cold start time shortening effect is the same as in the first embodiment shown in fig. 2. Other structures of the second embodiment are the same as those of the first embodiment, and the same reference numerals are added to the same structures, and detailed description thereof is omitted.
In the above embodiments, the auxiliary power battery is a lithium battery. As other examples, other secondary batteries than the lithium battery, such as a lead-acid battery or a nickel-hydrogen battery, may be used.
In the above embodiment, the cooling pipe of the auxiliary power battery 8 is a water-cooled plate. As another example, a structure other than the water-cooled plate may be used, and for example, a battery case having a hole-like structure may be used. In addition, the material selected by the water cooling plate preferably meets the requirement of low ion precipitation.
In the above-described embodiment, the start-up state at less than 0 degrees celsius is mainly described, that is, the first threshold value is 0 degrees celsius. However, the present invention is not limited thereto, and the first threshold value may be set to an appropriate value according to characteristics of different batteries.
In the above-described embodiment, the fuel cell 10 is started when the temperature exceeds 5 degrees celsius, that is, the second threshold value for determining whether to start the fuel cell 10 is set to 5 degrees celsius. However, the present invention is not limited thereto, and the second threshold may be set in the range of 3 to 5 degrees celsius, or may be set to other values.
In the above embodiment, the solenoid valves 9A, 9B are closed when the temperature exceeds 10 degrees celsius, that is, the third threshold value for determining whether to open or close the solenoid valves 9A, 9B is set to 10 degrees celsius. However, the present invention is not limited thereto, and the third threshold may be set to a suitable value, for example, 7 degrees celsius, according to characteristics of different batteries.
The term "comprising" as used throughout this application should not be construed as limiting to what is listed thereafter; it does not exclude other structural elements or steps. It should therefore be interpreted as specifying the presence of the stated features, integers, steps or components as referred to, but does not preclude the presence or addition of one or more other features, integers, steps or components, and groups thereof.
It is to be understood that features mentioned in one or more of the embodiments throughout this application may be combined in any suitable manner with features of other embodiments by one skilled in the art to practice the present application.
It should be noted that the foregoing is only illustrative of the preferred embodiments of the present application and the technical principles employed. It will be understood by those skilled in the art that the present application is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the application. Therefore, although the present application is described in more detail with reference to the above embodiments, the present application is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the technical concept of the present application.
Claims (10)
1. A hydrogen fuel forklift comprising a fuel cell (10), a fuel cell coolant circulation circuit (1), and a heater (7) for heating the fuel cell (10) through the fuel cell coolant circulation circuit (1),
further comprising:
an auxiliary power battery (8) on which a cooling line is mounted;
an input pipe (11) connecting the cooling line to the fuel cell coolant circulation circuit (1);
an output pipe (12) connecting the cooling line to the fuel cell coolant circulation loop (1).
2. The hydrogen-fuelled forklift according to claim 1, wherein solenoid valves (9A, 9B) are installed in both the inlet pipe (11) and the outlet pipe (12).
3. The hydrogen-fueled forklift according to claim 2,
further comprising:
a temperature sensor for detecting a temperature of the fuel cell coolant circulation circuit (1);
a pump (5) provided in the fuel cell coolant circulation circuit (1);
a control device electrically connected to the fuel cell (10), the auxiliary power cell (8), the pump (5), the temperature sensors (3A, 3B), and the electromagnetic valves (9A, 9B).
4. The hydrogen-fuelled forklift according to any one of claims 1-3, wherein the auxiliary power cell (8) is connected in parallel with the heater (7),
the heater comprises a PTC heater.
5. The hydrogen-fuelled forklift according to any one of claims 1-3, characterized by further comprising a radiator (6), the radiator (6) being connected in parallel with the cooling circuit.
6. A hydrogen-fuelled lift truck according to any one of claims 1-3, characterized in that the auxiliary power cell (8) comprises a lithium battery, on which a heating membrane is also mounted.
7. The hydrogen-fueled forklift according to any one of claims 1 to 3, wherein the cooling line includes a water-cooled plate.
8. The hydrogen-fueled forklift according to claim 3, wherein when the control device receives a signal for activating the hydrogen-fueled forklift and the temperature detected by the temperature sensor (3A, 3B) is less than a first threshold value, the control device operates the pump (5), heats the heater (7), and opens the electromagnetic valves (9A, 9B) in the input pipe (11) and the output pipe (12).
9. The hydrogen-fueled forklift according to claim 8, wherein the control device causes the fuel cell (10) to be activated and the heater (7) to be deactivated when the temperature detected by the temperature sensor (3A, 3B) is greater than a second threshold value that is greater than the first threshold value.
10. The hydrogen-fuelled forklift truck according to claim 9, wherein the control means causes the solenoid valves (9A, 9B) in the inlet duct (11) and the outlet duct (12) to close when the temperature of the auxiliary power cell (8) is greater than a third threshold value, wherein the third threshold value is greater than the second threshold value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202222260847.6U CN218677216U (en) | 2022-08-26 | 2022-08-26 | Hydrogen fuel forklift |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222260847.6U CN218677216U (en) | 2022-08-26 | 2022-08-26 | Hydrogen fuel forklift |
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| Publication Number | Publication Date |
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| CN218677216U true CN218677216U (en) | 2023-03-21 |
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| CN202222260847.6U Active CN218677216U (en) | 2022-08-26 | 2022-08-26 | Hydrogen fuel forklift |
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