Vehicle Thermal Runaway Solutions

For a long time, it seems that it is difficult for new energy vehicles to get rid of the problem of "spontaneous combustion". Because of the existence of batteries and high-voltage systems, its safety is concerned by many consumers. In particular, the battery, as a flammable and explosive substance, makes many car owners worried.

Fires can occur for a variety of reasons. Some burn after a collision, some burn while charging, and some spontaneously ignite without warning when driving or standing still. Blind pursuit of long battery life also brings battery safety hazards to pure electric vehicles. In order to achieve long battery life, it is necessary to increase the specific energy of the battery (that is, unit mass/energy per unit volume).The commonly used method is to adjust the battery structure, continuously reduce the auxiliary parts such as the shell and interlayer, and only retain the cathode, anode and electrolyte related to the battery performance.These subtracted parts are actually very important to ensure the safety of the battery. After removal, it is easy to cause thermal out of control. After the battery density is too high, its instability also buried the hidden danger of spontaneous combustion.It should be noted that when the fire is big, the power battery will be bent, deformed, and damaged. In addition to leakage, there may also be a large amount of toxic gas leakage at the scene.

sensor for Battery Pack Safety Inspection

In 2017, the country's new regulations stipulate that there must has a battery combustion alarm device inside the battery box of large passenger cars. At this stage, the alarm methods on the market are wired temperature sensing cables, fire detection tubes, smoke detection etc. Which is the most effective detection method?

Product type Monitoring method Feature comparison Performance comparison
Linear temperature sensing cable self-starting fire extinguishing device Passive Threshold judgment (temperature detection) Severe lagging (action will only take place after fire)
Fire detection tube temperature-sensing self-starting fire extinguishing device Passive Threshold judgment (temperature detection) The monitoring coverage is small, seriously lagging (the action will only take place after the fire)
Vehicle smoke alarm system Active Each independent threshold judgment (smoke detection, temperature detection, gas detection, flame detection) The alarm is in the front, the anti-interference is poor, the false alarm rate is high,

Solution for protecting the lives of drivers and passengers

Winsen Technology's battery combustion detection module responds quickly and alarms to the battery before and during combustion, which can effectively protect the life safety of drivers and passengers

The ZEP01 battery detection module is a general and miniaturized module, which uses the principles of electrochemical and planar semiconductors to detect the volatile gas of the battery and the gas generated when the battery is burned. Conduct triple detection on the battery box before and during combustion through gas, smoke, and temperature sensing cables. ZEP01 is a battery combustion comprehensive gas detection module designed and manufactured by closely combining mature electrochemical detection technology with semiconductor detection technology.

  • Gas detection: the gas(CO, nitrides, lithium compounds, etc.)volatilized before the combustion of the battery is detected, which has a good early warning effect.
  • Smoke detection: in the early stage of battery combustion, there will be smoke generated, smoke sensor senses smoke then alarm, which has a good alarm function and can be used as a mid-term early warning signal.
  • Temperature sensing cable detection: The temperature sensing cable is used as an action signal to link the fire extinguishing device. When a fire occurs, the temperature sensing cable is fused and a short circuit occurs, and an action signal is sent to start the fire extinguishing device (dry powder, aerosol, etc.) to extinguish the fire.
ZE21-CS battery leak detection module

▲ ZE21-CS battery leak
detection module

ZE21-CS electrochemical battery leakage detection module is a special, miniaturized module. The electrochemical principle is used to detect the volatile gas of the battery liquid and the integrated gas generated when the battery is burned, which has good gas selectivity and stability. Built-in temperature sensor for temperature compensation, with serial data output, high acquisition accuracy.

Vehicle

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How to choose the right sensor for your project?

We have 17 sensor series, 200+ categories, and 300+ detection objects for gas detection. Such as CO, CO2, VOC, PM2.5, CH4, LPG and so on. In particular, we also have MEMS sensors. According to your industry application, gas principle, power consumption, accuracy, and range requirements, and we can select a specific model for you. You can also use the product filter below to choose a suitable product, or choose online serivce.

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The first six FAQs. Use the search bar above to reveal more!

Can the Two Voltages of Mq-7 Exist All the Time, or Do They Need to Be Powered Alternately? if It is an Alternate Power Supply, What is the Appropriate Power Supply Time?

It requires alternate power supply. Please check the information on the product manual. This sensor is powered by 1.5V and 5V alternately. The low temperature and low voltage (1.5V) state can detect CO, and the high voltage (5V) is the desorption process. The recommended 5V voltage duration is 60s, 1.5V voltage duration is 90s to alternately supply power. Since it is a desorption process at 5V, it is normal for the voltage to drop when CO is 150ppm.

Can Wave Soldering Be Used for Semiconductor Sensors?

Yes, but you need to pay attention to the following points: 1. Use rosin flux with the least chlorine; 2. Speed: 1-2m/min; 3. Preheating temperature: 100±20℃; 4. Soldering temperature: 250±10℃;

Can the Catalytic Sensor Be Made into a Digital Display?

MC series catalytic products have good linearity and can be made into digital display products.
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