H2 sensor system up to 5 vol.-% H2

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H2-sensor system for Li-ion battery monitoring for automotive applications.

Lithium ion cells can be dangerous because mechanical damage, water ingress, overcharging or deep discharge (see below of this site) can cause flammable gases to escape and lead to a fire or explosion.

Our NEO966A sensor directly detects the hydrogen concentration, reducing and oxidizing gases, the gas pressure (increase in pressure when gas escapes), water formation and the battery temperature ("thermal runaway") in the battery / HVS high-voltage storage tank.  This can prevent fires or even explosions. 

Most important properties:

  • Measuring range H2: 0 to 5 vol.-%
  • Tolerance ± 0.3 vol.-% H2
  • Detection of reducing and oxidizing gases
  • Temperature measuring range: -40 to 85 °C
  • Pressure range: 65 to 120 kPa, i.e. 650 - 1,200 mbar absolute
  • Humidity: 0 to 100 % r.h. (non condensing)
  • Response time: t90 < 3 s
  • Recovery time: t10 < 3 s
  • Signal: CAN 2.0

Technical information for download can be obtained by clicking on "Data sheet" or select "Request" and contact us without obligation.

You can see the different installation options as follows:

installation options

 Explanation "Overloading" and "Deep Discharging":

If Li-ion cells are overloaded or exposed to high temperatures, the layer structure of the metal oxides breaks down. During this process - it is highly exothermic, i.e. high amounts of energy are released - elemental oxygen is formed. The high thermal energy leads to evaporation of the organic electrolyte liquid, resulting in highly combustible gases. If the temperature in the cell exceeds the flash point of a gas, this organic gas ignites and the Li-ion cell burns. Since this is a self-reinforcing process, it can lead to thermal passage and ignite the stored Li atoms (metal fire).

The deep discharge of a Li-ion cell can also lead to a fire. Again the electrolyte liquid decomposes and forms easily combustible gas. Copper ions dissolve from the copper sheet, which is used on the anode side as a conductor material. If such a deeply discharged Li-ion cell is charged, the amount of energy supplied can no longer be stored in chemical energy due to the lack of electrolyte liquid. The charging energy is converted into heat. In addition, the dissolved copper ions are deposited as copper needles on the graphite (anode). They can pierce the separator foil and cause a short circuit.

If the current density is too high and the supply lines melt as a result, reducing and oxidizing gases are also produced, which can be detected.