Hydrogen fuel cell car is really safe?

Hydrogen storage bottle is really safe?

At present, the high-pressure hydrogen bottle of hydrogen storage is the mainstream of the hydrogen storage way onboard hydrogen system. Mirai has two pressure 70 mpa hydrogen storage bottles in the back seat and rear below respectively. People most concerned about the two high pressure hydrogen storage bottles will burst occurred during car collision, and even explode. In order to eliminate the worries, Toyota made a with a 5 mm bullet shooting bottle of hydrogen storage experiments, experimental results show that although the bullet shoot through the outer wall of the hydrogen storage bottle, but the hydrogen storage bottle integrity intact, internal hydrogen only from the small hole overflow and lift in the air, no burst and explosions.

Actually, Mirai hydrogen storage bottle is composed of three layers structure, the innermost polymer material is high strength, middle is a mixture of strengthening of carbon fiber and high-strength polymer material, outer layer is a mixture of glass fiber and high-strength polymer materials, the total thickness 25 mm. It has good permeability, strength and durability, severely hit also don't have to worry about burst will happen.

Hydrogen gas will leak?

From the hydrogen bottle to the fuel cell, the weak link of hydrogen leakage is the airway, fuel cell and its connecting parts. Therefore, hydrogen fuel cell vehicles are equipped with a containment security system. Mirai, for example, near the hydrogen bottles and hydrogen sensing devices are installed near the wheel, can sense the hydrogen leak, 1 seconds off hydrogen bottles of solenoid valve and provide an alarm. At the same time, to when hydrogen bottle solenoid valve failure can be manually cut off the source of hydrogen, usually also equipped with a manual globe valve. Hydrogen bottle of solenoid valve and manual valve, which can effectively prevent hydrogen leakage, improve the hydrogen use safety.

What if the car is on fire?

When the body is in a fire environment, temperature sensor and pressure sensor detects the abnormal hydrogen storage temperature and pressure of gas inside the bottle and cut off the hydrogen supply. At the same time, to prevent hydrogen storage bottle because of the high temperature and high pressure explosion, cylinder valves installed on the fusible plug, under the temperature of 110 ℃ fusible plug will be melted, the hydrogen can be no more than 118 per minute NL out gradually, the speed of emptying in 60 minutes. So this time will discharge of hydrogen explosion? In general, hydrogen is burned under two conditions. It is to satisfy the hydrogen explosion limit, namely in 4% ~ 74.2% of hydrogen concentration in the air; Second, applying static electricity, open flames, or mixed air temperature of 527 ℃ and above. Hydrogen gas deflagration condition is order, must first meet the concentration, and then meet the lighting conditions. If have lighting conditions, hydrogen combustion as much as they will only discharge, don't knock, just like gas burner combustion gas.

Combustion of hydrogen will burn to the people?

The direction of the hydrogen gas discharge tube is postpone at the bottom of the car before and after the direction, can protect car cabin fire damage. This is not the new design, as early as at the beginning of the natural gas car produced, then through strict test and the safety design specification, has been used for a long time, safe and reliable.

Is hydrogenation safe?

Add air gun after add port connected to the car by electromagnetic lock, safety, and the level of the electric vehicle charging connector. Adding the function of the air gun with a one-way valve at the same time, in add QiTou damage cases, prevent gas leakage and improve QiTou outward service life. Electromagnetic valve, the pipeline for inflatable cylinders, can effectively prevent the gas into the battery. It is worth mentioning that Japan's latest law, users do not allow yourself to hydrogenation equipment operation, and the work should be completed by the professional staff of hydrogenation, is also considering prevent accidents.

To sum up, the hydrogen storage bottle "bulletproof level", coupled with the electromagnetic valve, safety valve, relief valve, hot melt bolt, manual stop valve, temperature sensors, pressure sensors and other auxiliary safety device, not only can effectively solve the problem of hydrogen leakage, can also reduce the car when the possibility of a hydrogen explosion violent collisions.

Therefore, we can safely use for hydrogen fuel cell car.

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