Hydrogen thermal coupling power system of extended-range solid hydrogen storage hydrogen fuel cell

Abstract

The invention provides an extended-range solid hydrogen storage hydrogen fuel cell hydrogen thermal coupling power system, which comprises a proton exchange membrane hydrogen fuel cell power generation module used for converting hydrogen and oxygen into electric energy through electrochemical reaction; the alloy solid hydrogen storage and supply module is used for storing hydrogen in a low-pressure safe and high-density manner, releasing heat during hydrogen charging and exchanging heat with external cooling fluid; heat is absorbed during hydrogen desorption and exchanges heat with waste heat of the hydrogen fuel cell, so that hydrogen-heat coupling in the hydrogen supply process is realized; and the hydrogen thermal coupling thermal management module is used for transferring waste heat of the fuel cell to the solid hydrogen storage device so as to support the hydrogen desorption and heat absorption process of the solid hydrogen storage device. The technical problem of alloy solid hydrogen storage in hydrogen supply stability is solved, gas hydrogen can be stably and rapidly supplied to a fuel cell under the working conditions of vehicle starting, climbing or rapid power increasing and the like, power output stability of a system is maintained, and the strict requirement of the traffic power field for power performance is met.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of fuel cells, in particular, to a range-extended solid-state hydrogen storage hydrogen fuel cell hydrogen-heat coupling power system. BACKGROUND

[0002] Hydrogen has the characteristics of high energy density, wide sources and zero emissions after use, and is widely considered as the best energy to replace fossil energy. Proton exchange membrane hydrogen fuel cell (PEMFC) is one of the most effective ways to realize hydrogen energy conversion. In recent years, with the support of national policy and the continuous development of industrial technology, hydrogen fuel cells have developed rapidly in the field of transportation power. However, due to the limitations of current hydrogen storage and supply technology, the hydrogen fuel cell power system still needs to be further improved in terms of hydrogen storage capacity and power stability.

[0003] In the field of transportation power, the current mainstream hydrogen storage and supply technology is high-pressure gaseous storage, but the high safety risk and low volume hydrogen storage density are the main obstacles to its further development. Alloy solid-state hydrogen storage technology has the advantages of low pressure safety and high volume hydrogen storage density, and is an effective way to solve the current hydrogen storage and supply problems in the field of transportation power. Especially in the mobile transportation field which is not sensitive to weight, such as forklifts, heavy trucks, ships, etc.

[0004] The alloy solid-state hydrogen storage technology has the characteristics of hydrogen absorption and heat release in the process of hydrogen charging and discharging, and hydrogen release and heat absorption. Therefore, in the hydrogen charging process, the alloy solid-state hydrogen storage system can exchange heat with the external cooling fluid to realize fast hydrogen charging, and in the hydrogen discharge process, the waste heat of the hydrogen fuel cell is used to ensure the rapid release and supply of hydrogen. Hydrogen-heat coupling is achieved during hydrogen supply to improve system energy utilization. However, in the field of transportation power, hydrogen supply stability is one of the important factors for stable operation of hydrogen fuel cells and efficient use of fuel, especially during startup, climbing or rapid power increase, the hydrogen consumption is large, and even if the alloy solid-state hydrogen storage hydrogen fuel cell hydrogen-heat coupling technology is used, it is difficult to ensure the stability of hydrogen supply. To solve the above problems, a range-extended solid-state hydrogen storage hydrogen fuel cell hydrogen-heat coupling power system is adopted, which effectively solves the problem of hydrogen supply stability of the alloy solid-state hydrogen storage system, meets the use requirements in the field of transportation power, and realizes the application of hydrogen-heat coupling technology, ensuring the efficient working state of the hydrogen fuel cell and fully improving the overall efficiency of the system. SUMMARY

[0005] The purpose of the present application is to solve the problems of high safety risk and low volume hydrogen storage density of high-pressure hydrogen storage and supply technology in the current field of transportation power, and the problem of hydrogen supply stability of alloy solid-state hydrogen storage technology. The reliable power output of the solid-state hydrogen storage hydrogen fuel cell system is realized, and the overall efficiency of the system is further improved.

[0006] In order to achieve the above-mentioned purposes, the application provides a hydrogen-thermal coupling power system of a range-extended solid-state hydrogen storage hydrogen fuel cell to improve the above-mentioned problems.

[0007] The application is specifically as follows:

[0008] The hydrogen-thermal coupling power system of the range-extended solid-state hydrogen storage hydrogen fuel cell comprises a proton exchange membrane hydrogen fuel cell power generation module for converting hydrogen and oxygen into electric energy through an electrochemical reaction, an alloy solid-state hydrogen storage hydrogen supply module for storing hydrogen at a low pressure in a safe and high-density manner, releasing heat during hydrogen charging, and exchanging heat with an external cooling fluid, absorbing heat during hydrogen release, and exchanging heat with hydrogen fuel cell waste heat to realize hydrogen-thermal coupling during hydrogen supply, a hydrogen-thermal coupling thermal management module for transferring fuel cell waste heat to the solid-state hydrogen storage device to support the hydrogen release and heat absorption process of the solid-state hydrogen storage device, a power management module comprising a DC converter, a power battery and a driving motor for electric energy conversion, storage and power output, and an intelligent control module comprising a control system and a control panel for coordinating the work of each subsystem and realizing overall control of the power system.

[0009] As a preferred technical solution of the application, the hydrogen-thermal coupling thermal management module comprises a fuel cell cooling circuit comprising a first temperature sensor, a first circulating water pump, a deionizer, a first thermostat, a first electric heater, a second thermostat, a radiator, a first heat exchanger, a first pressure sensor and a second temperature sensor connected in sequence by pipelines.

[0010] As a preferred technical solution of the application, the alloy solid-state hydrogen storage hydrogen supply module comprises an alloy solid-state hydrogen storage device, and a second circulating water pump, a second heater, a third temperature sensor, a second pressure sensor and an electromagnetic valve are sequentially arranged and connected between the alloy solid-state hydrogen storage device and the first circulating water pump through an output pipeline.

[0011] As a preferred technical solution of the application, an input pipeline is further communicated between the alloy solid-state hydrogen storage device and the first heat exchanger, and a fourth temperature sensor and a third pressure sensor are sequentially arranged on the input pipeline.

[0012] As a preferred technical solution of the application, the alloy solid-state hydrogen storage hydrogen supply module further comprises a self-locking hydrogen charging quick connector matched with the alloy solid-state hydrogen storage device, a first manual stop valve and a second manual stop valve are arranged on the self-locking hydrogen charging quick connector, a one-way valve is arranged on the first manual stop valve, and a flame arrester is arranged on the second manual stop valve.

[0013] As a preferred technical solution of the application, a self-locking cooling water inlet quick connector is further arranged on the alloy solid-state hydrogen storage device, and a cooling water filter, a pressure gauge and a first thermometer are further arranged between the self-locking cooling water inlet quick connector and the alloy solid-state hydrogen storage device.

[0014] As the preferred technical scheme of the present application, the hydrogen filter, the hydrogen proportional valve, the second heat exchanger, the fifth temperature sensor, the fourth pressure sensor and the hydrogen ejector are further arranged between the alloy solid-state hydrogen storage device and the proton exchange membrane hydrogen fuel cell.

[0015] As the preferred technical scheme of the present application, the air compressor, the sixth temperature sensor, the fifth pressure sensor and the humidifier are further sequentially connected to the proton exchange membrane hydrogen fuel cell, and the air compressor is connected to the second heat exchanger.

[0016] As the preferred technical scheme of the present application, the fuel cell cooling circuit further comprises a first expansion tank.

[0017] As the preferred technical scheme of the present application, the second expansion tank is further arranged on the input circuit between the first heat exchanger and the alloy solid-state hydrogen storage device.

[0018] Compared with the prior art, the present application has the following beneficial effects:

[0019] In the scheme of the present application:

[0020] The alloy solid-state hydrogen storage has the advantage of high volumetric hydrogen storage density, and more hydrogen can be stored in the same volume space, which greatly improves the hydrogen storage capacity of the hydrogen fuel cell power system, and further prolongs the cruising range. At the same time, through hydrogen heat coupling management and extended-range intelligent management strategy, the technical difficulties of alloy solid-state hydrogen storage in hydrogen supply stability are solved, which ensures that hydrogen can be stably and quickly supplied to the fuel cell under the working conditions of vehicle starting, climbing or rapid power increase, maintains the stability of the power output of the system, meets the strict requirements of the traffic power field on the power performance, and realizes the effective recovery and reuse of the waste heat of the hydrogen fuel cell. The waste heat is supplied to the solid-state hydrogen storage device for the endothermic demand of the hydrogen release process, reducing the dependence of the system on external heating energy. At the same time, the hydrogen fuel cell always maintains high efficiency operation, making the whole system more efficient in energy conversion and utilization process, improving the overall energy utilization rate of the system, and helping to reduce operating costs. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 A structure schematic view of an extended-range solid-state hydrogen storage hydrogen fuel cell hydrogen heat coupling power system is provided in the present application.

[0022] Indicated in the figure:

[0023] 1, Proton exchange membrane hydrogen fuel cell; 2, First temperature sensor; 3, First circulating water pump; 4, Deionizer; 5, First thermostat; 6, First electric heater; 7, Second thermostat; 8, Radiator; 9, First heat exchanger; 10, First expansion tank; 11, First pressure sensor; 12, Second temperature sensor; 13, Second expansion tank; 14, Second circulating water pump; 15, Second heater; 16, Third temperature sensor; 17 Second pressure sensor; 18, Solenoid valve; 19, Alloy solid-state hydrogen storage device; 20, Fourth temperature sensor; 21, Third pressure sensor; 22, Self-locking hydrogen filling quick connector; 23, First manual stop valve; 24, Check valve; 25, Second manual stop valve; 26, Flame arrester; 27, Safety valve; 28, Hydrogen filter; 29, Hydrogen proportional valve; 30, Second heat exchanger; 31, Fifth temperature sensor; 32, Fourth pressure sensor; 33, Hydrogen ejector; 34, Air filter; 35, Air compressor, 36, Sixth temperature sensor; 37, Fifth pressure sensor; 38, Humidifier; 39, Self-locking cooling water inlet quick connector; 40, Cooling water filter; 41, Pressure gauge; 42, First thermometer; 43, Second thermometer; 44, Self-locking cooling water outlet quick connector; 45, DC / DC; 46, Power battery; 47, Drive motor; 48, Control system; 49, Control panel. DETAILED DESCRIPTION

[0024] In order for those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the scope of protection of the present application.

[0025] The present application will be further described below in conjunction with the embodiments.

[0026] Embodiment: Reference Figure 1 A hydrogen thermal coupling power system of a range-extending solid-state hydrogen storage hydrogen fuel cell, comprising a proton exchange membrane hydrogen fuel cell power generation module as a core energy conversion component for converting hydrogen and oxygen into electrical energy through an electrochemical reaction to provide a power supply for electrical equipment such as a drive motor;

[0027] An alloy solid-state hydrogen storage hydrogen supply module for storing hydrogen at low pressure and high density, releasing heat when hydrogen is charged, and exchanging heat with an external cooling fluid; absorbing heat when hydrogen is discharged, and exchanging heat with hydrogen fuel cell waste heat to realize hydrogen thermal coupling during hydrogen supply;

[0028] The hydrogen-heat coupling thermal management module includes a fuel cell cooling circuit, a heat exchanger and other key components, realizes supply of waste heat of the fuel cell to the endothermic process of hydrogen release of the solid-state hydrogen storage device, and the insufficient part is supplemented by electric heating; meanwhile, the heat released during hydrogen charging of the solid-state hydrogen storage device is taken away through an external cooling circuit. The hydrogen fuel cell is ensured to operate in a stable and efficient state, and the energy efficient utilization and hydrogen supply stability of the whole system are ensured;

[0029] The power management module includes a DC converter, a power battery and a driving motor, realizes stable transmission, conversion and storage of electric energy, and ensures reliable power supply of the driving motor. Specifically, the electric energy generated by the hydrogen fuel cell is adjusted through the DC / DC converter, and then is used to supply power to the driving motor or charge the power battery, or provide electric energy for the power battery and the driving motor, so that the hydrogen fuel cell always maintains an optimal efficiency operating state. The working mode of the hydrogen fuel cell is controlled through reasonable setting of the dynamic balance of the battery capacity;

[0030] The intelligent control module includes a control system and a control panel, is used for coordinating the work of each subsystem and realizing overall control of the power system, serves as a command center of the whole power system, is responsible for controlling the working process and coordination of each component and subsystem, realizes overall optimized control of the power system, includes automatic adjustment of the start, stop and power output of the hydrogen fuel cell according to the power battery capacity, and ensures efficient and stable operation of the system according to the preset control logic. For example, when the battery capacity is lower than 50%, the hydrogen fuel cell is controlled to start working and charge the battery in the optimal efficiency state; when the battery capacity is higher than 70%, the hydrogen fuel cell is controlled to enter a low-power standby state, so as to achieve the purpose of energy saving and efficient energy management.

[0031] Further, the hydrogen-heat coupling thermal management module includes a fuel cell cooling circuit, and the fuel cell cooling circuit includes a first temperature sensor, a first circulating water pump, a deionizer, a first thermostat, a first electric heater, a second thermostat, a radiator, a first heat exchanger, a first pressure sensor and a second temperature sensor connected in sequence by pipelines.

[0032] Further, the alloy solid-state hydrogen storage hydrogen supply module includes an alloy solid-state hydrogen storage device, and the alloy solid-state hydrogen storage device and the first circulating water pump are connected in sequence by an output pipeline and are further connected with a second circulating water pump, a second heater, a third temperature sensor, a second pressure sensor and an electromagnetic valve.

[0033] As a preferred technical solution of the present application, the alloy solid-state hydrogen storage device and the first heat exchanger are further connected with an input pipeline, and a fourth temperature sensor and a third pressure sensor are arranged in sequence on the input pipeline;

[0034] Further, the alloy solid-state hydrogen storage hydrogen supply module further comprises a self-locking hydrogen filling quick connector matched with the alloy solid-state hydrogen storage device, the self-locking hydrogen filling quick connector is provided with a first manual stop valve and a second manual stop valve, the first manual stop valve is provided with a check valve, and the second manual stop valve is provided with a flame arrester.

[0035] Further, the alloy solid-state hydrogen storage device is further provided with a self-locking cooling water inlet quick connector, and the self-locking cooling water inlet quick connector is further provided with a cooling water filter, a pressure gauge and a first thermometer between the alloy solid-state hydrogen storage device.

[0036] Further, the alloy solid-state hydrogen storage device and the proton exchange membrane hydrogen fuel cell are further provided with a hydrogen filter, a hydrogen proportional valve, a second heat exchanger, a fifth temperature sensor, a fourth pressure sensor and a hydrogen ejector.

[0037] Further, the proton exchange membrane hydrogen fuel cell is further sequentially connected with an air compressor, a sixth temperature sensor, a fifth pressure sensor and a humidifier, and the air compressor is connected with the second heat exchanger.

[0038] Further, the fuel cell cooling circuit is further provided with a first expansion tank.

[0039] Further, the input circuit between the first heat exchanger and the alloy solid-state hydrogen storage device is further provided with a second expansion tank.

[0040] In specific implementation:

[0041] 1. System initialization and start-up phase:

[0042] When the vehicle or power equipment is started, the control system first performs self-checking to check whether the connection states of various sensors, actuators and components are normal, including the working states of key components such as temperature sensors, pressure sensors, circulating water pumps, electric heaters, hydrogen ejectors and air compressors; at the same time, according to the initial power of the power battery, the control system judges whether the hydrogen fuel cell needs to be started to charge. If the battery power is lower than the preset start threshold (such as 50%), an instruction is issued to start the hydrogen fuel cell system; if it is higher than the threshold, the hydrogen fuel cell can be temporarily kept standby, and the power battery is relied on to provide initial start-up power for the driving motor.

[0043] Before starting the hydrogen fuel cell, the cooling circuit starts to work, and the circulating water pump delivers deionized cooling liquid to the inside of the fuel cell, so as to ensure that the fuel cell is in a suitable working temperature range when starting, and prevent the performance and service life of the fuel cell from being affected due to too high or too low temperature; at the same time, the valves in the hydrogen circuit are in a closed state, waiting for further instructions of the system.

[0044] 2. Hydrogen fuel cell normal operation and hydrogen supply phase:

[0045] When the hydrogen fuel cell starts, the control system controls the air flow into the fuel cell by adjusting the speed of the air compressor according to the real-time power demand of the vehicle, while the hydrogen ejector starts to work to inject the hydrogen released from the alloy solid-state hydrogen storage device into the hydrogen inlet of the fuel cell.

[0046] During the hydrogen release process, the release of hydrogen from the alloy solid-state hydrogen storage device will cause endothermic phenomenon, at this time the hydrogen heat coupling management system will transfer the waste heat generated by the hydrogen fuel cell to the solid-state hydrogen storage device through the heat exchanger to provide the required heat for the hydrogen release process; if the waste heat supply is insufficient, the second electric heater will automatically start to supplement the required heat, ensuring that hydrogen can be released stably and quickly to meet the hydrogen demand of the fuel cell; if the temperature of the fuel cell cooling loop is too high, the excess heat will be released through the thermostat and radiator.

[0047] The electrical energy output from the fuel cell directly charges the power battery, keeping the power battery's electricity at a relatively stable level, ensuring that the vehicle has enough power support under various working conditions.

[0048] 3. Power battery electricity management and range extension control strategy:

[0049] The control system monitors the power battery's electricity state in real time, and when the battery's electricity is below 50%, it will automatically start the hydrogen fuel cell to power the drive motor and charge the power battery, ensuring normal vehicle operation; at this time, the hydrogen fuel cell is in the best efficiency working state to achieve high-efficiency and stable energy output.

[0050] As the power battery's electricity gradually recovers, when the electricity reaches more than 70%, the control system will control the hydrogen fuel cell to enter a low-power standby state, only maintaining its basic operation and a small amount of hydrogen supply, to reduce energy consumption.

[0051] Throughout the process, the control system will also adjust the hydrogen fuel cell start-stop according to the vehicle's speed, acceleration, load and other dynamic information, optimize the overall performance of the power system, and ensure that the vehicle can obtain the best power output and energy utilization efficiency under various complex working conditions.

[0052] 4. System stop and safety protection phase:

[0053] When the vehicle stops running, the control system will shut down each component in a predetermined order. First, the drive motor stops working, the hydrogen supply of the fuel cell gradually decreases, the hydrogen ejector stops running, the hydrogen cutoff valve is closed to ensure that hydrogen is no longer released from the solid-state hydrogen storage device; the fuel cell completely stops working.

[0054] In the system running process, if any abnormal situation appears, such as hydrogen leakage, temperature is too high, pressure is abnormal, etc., the safety protection device will start immediately. The flame arrester can effectively prevent the explosion accident caused by hydrogen flame backfire; the safety valve is automatically opened when the system pressure exceeds the set value, and the high pressure is released to ensure the safety of the system; the hydrogen filter can filter out the impurities and small particles in the hydrogen, ensure the quality and purity of the hydrogen, and reduce the damage to the fuel cell; each manual stop valve can be manually closed in an emergency to shut off the passage of hydrogen, coolant and other media, further improving the safety of the system.

[0055] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integrated; can be mechanical connection, can also be electrical connection or communication with each other; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0056] Obviously, the above-described embodiments are only a part of the embodiments of the present application, and are not all the embodiments. The preferred embodiments of the present application are given in the drawings, but do not limit the patent scope of the present application. The present application can be realized in many different forms, and on the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements to some technical features. Any equivalent structure made by using the content of the present application specification and drawings, directly or indirectly applied to other related technical fields, is also within the patent protection scope of the present application.

Claims

1. A range-extended solid-state hydrogen storage hydrogen fuel cell hydrogen thermal coupling power system, characterized in that, include: A proton exchange membrane hydrogen fuel cell power generation module is used to convert hydrogen and oxygen into electrical energy through an electrochemical reaction. The alloy solid hydrogen storage and supply module is used for low-pressure, safe, and high-density hydrogen storage. It releases heat during hydrogen filling and exchanges heat with external cooling fluid; it absorbs heat during hydrogen release and exchanges heat with waste heat from the hydrogen fuel cell, thus achieving hydrogen-thermal coupling during the hydrogen supply process. The hydrogen thermal coupling thermal management module is used to transfer waste heat from the fuel cell to the solid hydrogen storage device to support its hydrogen release and heat absorption process. The power management module, including a DC converter, a power battery, and a drive motor, is used for power conversion, storage, and power output. The intelligent control module, including the control system and control panel, is used to coordinate the operation of various subsystems and realize the overall control of the power system.

2. The range-extended solid-state hydrogen storage hydrogen fuel cell hydrogen thermal coupling power system according to claim 1, characterized in that, The hydrogen thermal coupling thermal management module includes a fuel cell cooling circuit, which includes a first temperature sensor, a first circulating water pump, a deionizer, a first thermostat, a first electric heater, a second thermostat, a radiator, a first heat exchanger, a first pressure sensor, and a second temperature sensor, all connected in sequence by pipelines.

3. The range-extended solid-state hydrogen storage hydrogen fuel cell hydrogen thermal coupling power system according to claim 2, characterized in that, The alloy solid hydrogen storage and supply module includes an alloy solid hydrogen storage device. The alloy solid hydrogen storage device and the first circulating water pump are sequentially connected through an output pipeline to a second circulating water pump, a second heater, a third temperature sensor, a second pressure sensor, and a solenoid valve.

4. The range-extended solid-state hydrogen storage hydrogen fuel cell hydrogen thermal coupling power system according to claim 3, characterized in that, The alloy solid hydrogen storage device is also connected to the first heat exchanger by an input pipeline, on which a fourth temperature sensor and a third pressure sensor are sequentially installed.

5. The range-extended solid-state hydrogen storage hydrogen fuel cell hydrogen thermal coupling power system according to claim 4, characterized in that, The alloy solid hydrogen storage and supply module also includes a self-locking hydrogen charging quick connector adapted to the alloy solid hydrogen storage device. The self-locking hydrogen charging quick connector is equipped with a first manual shut-off valve and a second manual shut-off valve. The first manual shut-off valve is equipped with a check valve, and the second manual shut-off valve is equipped with a flame arrester.

6. The range-extended solid-state hydrogen storage hydrogen fuel cell hydrogen thermal coupling power system according to claim 5, characterized in that, The alloy solid hydrogen storage device is also equipped with a self-locking cooling water inlet quick connector, and a cooling water filter, pressure gauge, and first thermometer are also installed between the self-locking cooling water inlet quick connector and the alloy solid hydrogen storage device.

7. The range-extended solid-state hydrogen storage hydrogen fuel cell hydrogen thermal coupling power system according to claim 6, characterized in that, The alloy solid hydrogen storage device is further equipped with a hydrogen filter, a hydrogen proportioning valve, a second heat exchanger, a fifth temperature sensor, a fourth pressure sensor, and a hydrogen ejector between it and the proton exchange membrane hydrogen fuel cell.

8. The range-extended solid-state hydrogen storage hydrogen fuel cell hydrogen thermal coupling power system according to claim 7, characterized in that, The proton exchange membrane hydrogen fuel cell is also connected in sequence to an air compressor, a sixth temperature sensor, a fifth pressure sensor, and a humidifier, wherein the air compressor is connected to a second heat exchanger.

9. A range-extended solid-state hydrogen storage hydrogen fuel cell hydrogen thermal coupling power system according to claim 8, characterized in that, The fuel cell cooling circuit is also equipped with a first expansion tank.

10. A range-extended solid-state hydrogen storage hydrogen fuel cell hydrogen thermal coupling power system according to claim 8, characterized in that, A second expansion tank is also provided on the input circuit between the first heat exchanger and the alloy solid hydrogen storage device.

Images