Key Measures to Ensure Battery Safety After Thermal Runaway

Battery safety is critical in energy storage systems, especially when addressing the risks of thermal runaway. Thermal runaway can lead to heat spread, triggering a chain reaction in neighboring battery cells, such as heat generation, fire or even explosion, increasing the risk of battery system failure. To tackle this challenge, Pylontech has implemented advanced protection measures in its lithium-ion battery designs to ensure the overall safety and stability of the system.

Nano insulation boards

Pylontech utilizes nano insulation boards between cells to block high temperatures and flames from spreading.

These boards provide the following advantages:

• Nano powder with a light-blocking component effectively blocks heat transfer
• Nano insulation mats have excellent temperature resistance and hydrophobicity
• Nano insulation boards have a lower density and are lighter in weight

In Pylontech's thermal runaway heat spreading test, the test cell was charged with a nominal current of 157A until the thermal runaway condition was triggered. Voltage and temperature data were continuously recorded until the thermal runaway cell released all its energy.

Upon completion of the test, no thermal spreading was observed in the battery module, and the battery did not catch fire or explode.

Pressure release technology

To prevent potential explosions after thermal runaway, Pylontech integrates pressure release technology in lithium-ion battery design. When internal temperature and pressure rise abnormally, the holes on the battery casing will release the pressure automatically, protecting the system from damage.

Isolation design

By dividing the system into multiple relatively independent units for cooperative use, any failure will affect only one or a few units, without compromising the stability of the whole system.

Heat spread simulation models

To further optimize safety technologies, Pylontech developed models for heat spreading simulation, hot gas coupling, and heat spreading inhibition of Li-FePO4 batteries.

These models enable an in-depth analysis of the mechanisms behind thermal runaway heat spreading, the development of reliable inhibition measures, as well as the optimization of thermal isolation and fireproofing materials, driving Pylontech's commitment to achieving zero heat spread in its modules.