Wiring duct,Cable Gland,Cable Tie,Terminals,RCCN

The development of new energy vehicles (electric cars), the battery is a bottleneck. In order to crack this, we focus on improving the power of the battery than the energy, so the energy is now increasing every day. However, theoretically, the higher the power of the battery, the installation of its car, the safety considerations are more and more important. Today, pure electric car once charge mileage of more than 200 km, the market acceptance was basically recognized, but the safety of electric vehicles, the user acceptance is "zero tolerance." How to do absolutely safe? Is the promotion of electric vehicles and have to face a new bottleneck. The following describes the "power battery pack security system principles and examples" is to achieve the realization of electric vehicles in the power battery this one must be 100% safe.
First, the power battery is relatively safe
Power battery is electrochemical products, that is, dangerous goods. But the level of its dangerous goods is relatively low, the international organizations on the classification of dangerous goods level. Power battery rating is the 8th grade 9 dangerous goods. Compared with bombs, firecrackers, gasoline, diesel, in the normal state, will not explode, will not fire. But the power battery installed in the car after the environment has undergone great changes, and the car safety accident frequency is still very high. Power battery in the car accident (collision, rollover, etc.), can not guarantee the occurrence of sub-security incidents? If the power battery system in the event of an accident occurred within the internal short circuit, can not guarantee the occurrence of security incidents? How has the occurrence of electric battery safety Accident, there is no way to prevent its amplification? The above is to be answered, can not be avoided.
Second, in extreme conditions, the power battery accident probability is objective
Under the current technical conditions, the car in the high-speed driving process, the probability of a security accident is relatively high. In the technical capacity can not meet the requirements of the premise, the current basic approach is through education and management tools to protect the safety of the car. In fact, the traditional car safety measures are also continuous improvement, but the car is growing faster and faster, car driving from a career into a personal life skills. The safety requirements for the car is also getting higher and higher. Similarly, the power battery in normal, the harm is not big, but the electric car to enter the ordinary people's home, and electric cars is a household appliances, the security must guarantee 100%. I believe that the current household appliances can do, electric cars can be done. Power battery as a car assembly, the market requires its security must be done with the car with 100% of the life cycle.
Third, the power battery safety measures is a system
Power battery safety measures are a systems engineering. From the power battery production to the battery pack integration, to the battery system to complete the installation, to the vehicle installation layout, to the user daily vehicle maintenance, are safe technical requirements and safety responsibilities. The focus is on the power battery pack security technology upgrade, which has penetrated into the safety of fire areas. The current power battery safety technology, from the electrical material, battery pack, battery system and connectors, harness security level security is continuing to improve. But according to the safety requirements of household batteries, the gap is still large, otherwise there will not be a burning 80,90 new energy bus incident. Life off the day, safe no small matter. To develop new energy (electric) cars, the possibility of insecurity must be reduced to zero.
Fourth, the basic safety requirements for power battery pack
In accordance with the relevant national standards, more than 6m passenger car battery pack, requiring the configuration of automatic fire extinguisher assembly. Of course, from the technical, the basic requirements of the car battery pack is, its technical indicators of stability is better, he does not appear quality problems. In the extreme case, can not appear short circuit, overheating, can not fire, but can not explode. If the above situation occurs, it must be in a very short period of time, the risk of safety accidents to a minimum, must ensure the safety of personnel.
5, technically on the battery pack safety measures (assembly pieces) requirements
(1) the assembly of the volume to be small, the weight should be light, relative to the battery pack, to be negligible. The reason is that the power battery pack space is very limited, the current battery pack to improve the specific energy, its task is very heavy.
(2) active detection, data analysis and evaluation, control, management, multiple functions, highly integrated, intelligent analysis of the battery thermal runaway phase and automatic intervention control, the reason is that the battery pack is a dynamic working system, the index value is constantly changing, And is random. These functions must be intelligent.
(3) and BMS management system must be able to dock. Will detect the battery box due to internal short circuit, excessive charge and discharge, external short circuit and so on the fire caused by the initial gas, quantity, smoke, fire and other information through the data bus in time to pass the control station. The reason for this is already the basic function.
(4) in the absence of power conditions, when the ambient temperature to the specified value, the fire extinguishing device can automatically start to complete its design function. The reason is that electric cars are often in a stopped state, and power battery internal work and did not stop, and this time the probability of occurrence of security incidents great. With this function, can be safe and foolproof.
Six, the characteristics of traditional fire extinguishing products introduced

Halon 1301 (haloalkane)
Pressure storage, off
Fire efficiency is high,
The ozone layer is banned by countries
Heptafluoropropane
(FM200)
Pressure storage, fire efficiency is higher, high temperature hydrogen fluoride and water to form a corrosive toxic substances hydrofluoric acid.
Carbon dioxide (CO2)
Pressure storage, fire efficiency is low, the operator demanding, lack of safety can cause suffocation and other personal injury.
Mixed gas (IG541)
High pressure storage, fire efficiency is low, the product by the ambient temperature constraints, the system is expensive.
At present, carbon dioxide products have been widely used in engine room and passenger car body. This type of product for power battery box fire, began to use electric bag. But the problem is that the volume is too large, too much after the fire off the remnants, cleaning is very difficult. A new security incident, the current control of its lower intelligence, promotion is very difficult. Heptafluoropropane for power battery box fire, there are deficiencies, mainly with the battery pack manufacturers docking, to the liquid transport to the battery pack inside, to a certain length of the pipeline support, the process layout more difficult.
Seven, the new power battery pack security system
The following is the 710 research institute developed the power battery security products (for the military to civilian goods), I will learn to experience, share the following:
(1) small size, light weight, easy to install and convenient, put out a cubic space fire only minimum 28 grams of pharmaceuticals.

(2) to the second speed of rapid fire fighting, temperature automatically or manually start, the device omni-directional submerged eruption.
(3) no pressure storage, no complicated pipe network, waterproof moisture, temperature corrosion, ten years free maintenance.

(4) after the release of sub-nano-particles with the smoke discharge, no residual attachments, non-toxic harmless, easy to maintain clean-up.
Its basic principles:
When the fire occurs, the aerosol automatic fire extinguishing device through the electric start or temperature start way to trigger the role of extinguishing agents, the rapid generation of a large number of sub-nanometer-class solid particles and inert gas mixture, the aerosol, three-dimensional submerged effect on the fire Occurs in every corner and quickly extinguishes the fire.
The following are the same as the "
The following are the same as the "
The following are the same as the "
Eight, summary
China Shipbuilding Industry Corporation 711 Research Institute is a national 863 program high-tech project research unit, has a involved in machinery, electronics, materials, automatic control, precision instruments, computer hardware and software, system simulation and other professional experience of the research team The
How to use the national team resources to solve the current development of new energy vehicles face many of the technical problems, is worthy of our industry professionals to seriously study and think things. The development of new energy vehicles is a national strategy, the civilian product of civilian products, the benefit of ordinary people, but also a basic idea.