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Three Ways to Protect Vehicle from LiB Thermal Runaway: Part 2 of 2

Improving the safety of lithium-ion batteries (LiBs) installed in electric vehicles (BEVs) has become one of the most crucial development themes. To prevent ignition caused by thermal runaway of LiBs or to suppress the spread of fire, we would like to introduce the safety measures undertaken by NAGASE in collaboration with Zhejiang Boomrun, a Chinese company that is partially funded by NAGASE. This article is the second part of our series, focusing on insulation and humidity control materials as additional protective measures, complementing the fireproofing solutions discussed in Part 1.

The Issue

For an overview of fireproofing solutions, please refer to Part 1.

Thermal runaway can occur when an overheated battery cell ignites and transfers heat to surrounding cells, potentially leading to a catastrophic failure of the entire battery pack. Additionally, moisture buildup within the battery pack can cause condensation, leading to short circuits and further safety risks. Addressing these challenges requires solutions that effectively manage heat transfer and humidity levels within the battery pack.

The Solution

Insulation Material to Prevent Cascading Thermal Runaway Between Battery Cells

Inter-Cell Insulation Material (Product Name: SUP HIP) is designed to be placed between battery cells to prevent heat transfer and stop thermal runaway from spreading.

Using an advanced inorganic fiber nano composite, this material is both lightweight and highly effective in heat insulation. By acting as a barrier between cells, it maintains battery pack integrity and reduces safety risks. Additionally, the durability of the inorganic nanofibers ensures long-term reliability for electric vehicles.

Cellular insulation material

One of its strengths is its low thermal conductivity at high temperatures, and test results have shown that it can withstand a flame of 1,000°C for more than 10 minutes.

SUP HIP installed between cells

Moisture Control Material to Prevent Short Circuits Caused by Condensation

Moisture (Humidity) Control Material (Product Name: HCCF) is designed to regulate humidity inside the battery pack and prevent condensation-induced short circuits.
Made by impregnating polyester fibers with high-molecular-weight, water-absorbing polymers, this material offers semi-permanent use. It can absorb up to twice its weight in water, with an absorption rate of 50–70%. When humidity drops, it releases the absorbed moisture, allowing repeated absorption cycles.

Image of humidity control using HCCF

Initially developed for anti-fogging in automotive cameras, this technology has now proven effective in battery packs, particularly in high-humidity environments and vehicles subject to temperature fluctuations.

Humidity changes with and without HCCF

Comprehensive Safety Measures for LiBs

NAGASE, in collaboration with Boomrun, is proactively developing solutions to prevent LiB thermal runaway. By integrating fireproofing, insulation, and humidity control materials, we take a multi-layered approach to battery safety. Each technology addresses a specific risk, ensuring comprehensive protection. This strategy not only enhances the safety of electric vehicles but also improves battery reliability and longevity. Through continuous innovation, NAGASE and Boomrun are leading advancements in LiB safety, driving a safer and more sustainable future for electric vehicles.
Contact NAGASE for any inquiries about LiB safety enhancements.