New national standard for charging station cables: interpretation of halogen-free magnesium hydroxide solution
In order to further regulate the market, ensure user safety, and promote the healthy development of the industry, relevant national departments have issued new national standards for charging station cables. In this context, magnesium hydroxide, as an environmentally friendly and efficient halogen-free flame retardant material, has been widely used and recommended in the new national standard.
1、 The importance and challenges of charging station cables
Charging station cables are the link between charging stations and electric vehicles, and play an important role in power transmission. Its quality is directly related to charging efficiency, usage safety, and the reliability of the entire charging facility. However, in practical applications, charging station cables face many challenges:
Stable operation in high temperature environment
The heat generated during the charging process can have an impact on the cable, especially in fast charging mode where the temperature rise is more pronounced.
Requirements for fire and flame retardant performance
Charging stations are usually installed in public areas or residential communities. Once a fire occurs, the consequences can be unimaginable. Therefore, extremely high requirements have been put forward for the fire and flame retardant performance of cables.
Improvement of environmental and non-toxic standards
With the increasing awareness of environmental protection in society, traditional halogen containing flame retardants are gradually being phased out due to the release of toxic gases during combustion, and new environmentally friendly materials have become an inevitable choice.
2、 Characteristics of halogen-free magnesium hydroxide solution
Magnesium hydroxide (Mg (OH) ₂), as a typical inorganic non-metallic mineral material, has shown great potential in the field of cable manufacturing, especially in high-voltage cables related to new energy vehicles, due to its unique physical and chemical properties.
1. Excellent flame retardant effect
Magnesium hydroxide has a high thermal decomposition temperature (about 340 ℃), which can quickly absorb a large amount of heat at high temperatures and form a dense magnesium oxide protective film through dehydration reaction, effectively preventing flame spread and significantly improving the flame retardant level of cables.
2. Low smoke and halogen-free characteristics
Unlike traditional halogenated flame retardants, magnesium hydroxide does not produce any toxic or harmful gases during combustion, only generating water vapor and a small amount of oxides, greatly reducing the risk of toxicity in fires and complying with modern strict environmental regulations.
3. Good mechanical performance
After special treatment, magnesium hydroxide particles can be uniformly dispersed in the polymer matrix, which not only does not weaken the overall strength of the cable, but also helps to improve its processing and mechanical properties, and extend its service life.
3、 Specific requirements of the new national standard for halogen-free magnesium hydroxide cables
The newly released national standard for charging station cables has comprehensively upgraded various performance indicators of the cables, with particular emphasis on the importance of using environmentally friendly halogen-free materials. Specifically:
In terms of flame retardant performance
Require UL94 V-0 level or above to ensure effective suppression of fire development under extreme conditions.
Environmental standards
Clearly stipulate that heavy metals such as lead and mercury, as well as persistent organic pollutants such as polybrominated biphenyls (PBDEs) and polychlorinated biphenyls (PCBs), are not allowed. Encourage the use of green halogen-free flame retardants such as magnesium hydroxide.
Weather resistance and durability
Emphasize that the product should have good resistance to UV aging and be suitable for long-term outdoor exposure conditions; At the same time, it is required that the cable can maintain a certain degree of flexibility and impact resistance in low-temperature environments.
4、 Practical application case analysis of halogen-free magnesium hydroxide cable
At present, many enterprises have begun to try to apply magnesium hydroxide halogen-free technology to the production of charging pile cables, and have achieved good results. For example, a well-known cable manufacturer has successfully introduced a composite material formula based on magnesium hydroxide in its latest fast charging pile dedicated cable, achieving breakthroughs in the following aspects:
Weight reduction
Due to the low density and relatively small amount of magnesium hydroxide added, the overall weight of the finished cable is reduced by about 15% compared to traditional products, which is beneficial for reducing transportation costs and installation difficulties.
Improved flame retardant performance
After multiple tests and verifications, the self extinguishing time of the cable in simulated fire scenarios has been shortened to less than 3 seconds, far below the industry average level, greatly improving the safety of use.
Significant environmental benefits
During the disposal process, cables without halogen components will not cause secondary pollution to soil and water sources, demonstrating good ecological benefits and social responsibility.