Research on Restrain on Thermal Runaway Propagation,
Runaway Propagation,

▍What is ANATEL Homologation?

ANATEL is a short for Agencia Nacional de Telecomunicacoes which is Brazil governmental authority to certified communication products for both compulsory and voluntary certification. Its approval and compliance procedures are the same both for Brazil domestic and abroad products. If products are applicable to compulsory certification, the testing result and report must be in line with the specified rules and regulations as requested by ANATEL. Product certificate shall be granted by ANATEL first before product is circulated in marketing and put into practical application.

▍Who is liable for ANATEL Homologation? 

The Brazil governmental standard organizations, other recognized certification bodies and testing labs are ANATEL certification authority for analyzing the production system of manufacturing unit, such as product design process, procurement, manufacturing process, after service and so on to verify the physical product to be complied with Brazil standard. Manufacturer shall provide documents and samples for testing and assessment.

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● MCM possesses 10 years abundant experience and resources in testing and certification industry: high quality service system, deeply qualified technical team, quick and simple certification and testing solutions.

● MCM collaborates with multiple high-quality local officially recognized organizations providing various solutions, accurate and convenient service for clients.

The thermal propagation of a module experiences following stages: Heat accumulation after cell thermal abuse, cell thermal runaway and then module thermal runaway. Thermal runaway from a single cell is not influential; however, when the heat spread to other cells, the propagation will cause a domino effect, leading to the thermal runaway of the whole module, releasing massive energy. Figure 1 shows the result of thermal runaway test. The module is on fire due to irresistible propagation.The heat conductivity inner a cell will be different according to different directions. The coefficient of heat conductivity will be higher in the direction parallel with the roll core of a cell; while the direction that is vertical to the roll core has lower conductivity. Therefore thermal spread from side to side between cells is faster than it does through tabs to cells. Therefore the propagation can be seen as a one-dimension propagation. As battery modules are designed for higher energy density, the space between cells is getting smaller, which will worsen thermal propagation. Therefore, suppressing or blocking the spread of heat in the module will be considered as an effective way to decrease hazards.
We can restrain thermal runaway actively or passively.
Active thermal spread suppression is mostly based on thermal management system, like: